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Dr Terry Offline
#1 Posted : Saturday, 15 April 2017 5:00:12 PM(UTC)
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Hi Guys.

I've been doing some research on Falcon engines of the 70s, especially those fitted to the XC series.

As Byron has found, GM-H 'fiddled' the HP figures in the HJ to HZ series. It appears most manufacturers around this time did this partly due the intro of ADR27A & also the intro of SAE net & DIN standards.

It appears that Ford did similar things in the XC & XD series.

I was working on these cars when they were new & I distinctly remember the XC update model which was released in 5/78, which Ford referred to as the 'XC & 1/2'.

It was introduced to combat Holden's 'Radial Tuned' HZ series & included many minor upgrades.

The reason for my post is that very little of this is documented anywhere & I am relying mostly on my memory, which is not as sharp as it once was ! I would like some of this verified.

The main visual changes were the changes from F-O-R-D lettering on the bonnet & rear to the re-introduction of the Blue Oval badge. The 500 got perforated vinyl trim & the option lists were re-jigged in several areas.

The mechanical changes included suspension improvements (naturally) with a rear anti-roll bar introduced. The power steering pump was changed from the old 'Tin Can' C1 style to the plastic-cased C2 style. Also the engines all changed colour from the traditional mix of blue & orange to black blocks with silver rocker covers, in the same style as XD engines.

Ford didn't much much fanfare about it but at this time, but it appears that all the engine outputs were changed from 80kW, 92kW, 151Kw & 162kW for the 3.3, 4.1, 4,9 & 5,8 respectively to 82kW, 94kW, 134kW & 149kW. The first figures were published at the XC release & the second lot are XD numbers for essentially the same engines.

The main thing that I need verified is that the engine colour changed at the 5/78 upgrade as I think. Are there enough original cars out there the back this up. In other word does anybody know the existence of any update models (i.e. built after 5/78) with a blue/orange engine. Alternatively a pre update model with an XD style black/silver engine.

Thanks in advance, Dr Terry.

Edited by user Saturday, 15 April 2017 5:02:18 PM(UTC)  | Reason: Spelling

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castellan Offline
#2 Posted : Sunday, 16 April 2017 9:52:31 AM(UTC)
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Originally Posted by: Dr Terry Go to Quoted Post
Hi Guys.

I've been doing some research on Falcon engines of the 70s, especially those fitted to the XC series.

As Byron has found, GM-H 'fiddled' the HP figures in the HJ to HZ series. It appears most manufacturers around this time did this partly due the intro of ADR27A & also the intro of SAE net & DIN standards.

It appears that Ford did similar things in the XC & XD series.

I was working on these cars when they were new & I distinctly remember the XC update model which was released in 5/78, which Ford referred to as the 'XC & 1/2'.

It was introduced to combat Holden's 'Radial Tuned' HZ series & included many minor upgrades.

The reason for my post is that very little of this is documented anywhere & I am relying mostly on my memory, which is not as sharp as it once was ! I would like some of this verified.

The main visual changes were the changes from F-O-R-D lettering on the bonnet & rear to the re-introduction of the Blue Oval badge. The 500 got perforated vinyl trim & the option lists were re-jigged in several areas.

The mechanical changes included suspension improvements (naturally) with a rear anti-roll bar introduced. The power steering pump was changed from the old 'Tin Can' C1 style to the plastic-cased C2 style. Also the engines all changed colour from the traditional mix of blue & orange to black blocks with silver rocker covers, in the same style as XD engines.

Ford didn't much much fanfare about it but at this time, but it appears that all the engine outputs were changed from 80kW, 92kW, 151Kw & 162kW for the 3.3, 4.1, 4,9 & 5,8 respectively to 82kW, 94kW, 134kW & 149kW. The first figures were published at the XC release & the second lot are XD numbers for essentially the same engines.

The main thing that I need verified is that the engine colour changed at the 5/78 upgrade as I think. Are there enough original cars out there the back this up. In other word does anybody know the existence of any update models (i.e. built after 5/78) with a blue/orange engine. Alternatively a pre update model with an XD style black/silver engine.

Thanks in advance, Dr Terry.

I don't believe the 6 cyl XC changed colour at all, one old dude I know of that goes on about his XC being a XC & 1/2 4.1L engine is blue in colour and my 3.3L p van was a Jan 1979 build with a blue engine.

I know that the XC V8's did perform better than when the XC first came out, but as for that being when the XC & 1/2 came out I am not sure it is true, but a 5.8L Fairlane could do 195KM/H flat out and the next type due to a carby improvement could do 210KM/H stock.

As for the KW figures the XB is in SAE Gross and the XC I believe is in Net and the XD is in DIN for the 4.9L to go down from 151 to 134 and the 5.8L from 162 to 149.
the 4.1L XC is 92KW 3900 /289NM 1900 8.9:1 Net
The 4.1L XD is 92KW 3900 /295NM 1900 9.0:1 ?
The 4.1L XD is 94KW 4000 /305NM 2000 9.35:1 DIN with Alloy head.
The 4.1L XE is 93KW 3800 /305NM 1700 9.3:1
The 4.1L XF is 103KW 3750 /316NM 2400 9.35:1 lead
The 4.1L XG is 97KW 3600 /297NM 2000 8.77:1 unleaded.
Maybe the later XC got the XD type engine but not the colour, the V8's only went black from the XD on with silver rocker covers.
My mates XD 4.1L alloy head type had a silver rocker cover and I think that the XD 4.1L iron head rocker cover was black and the XC 4.1L was red rocker cover.

Look at the Holden's they used Gross up to HZ and DIN from the 1978 VB Commodore.
Falcon used Gross up to 1976 XB and then Net in the up to 1979 XC and then DIN in the XD from 1979.
So they get their act together in the 80's with DIN figures.

But then again 140KW for a 4.9L Falcon XD verse a Commodore 5.0L at 126KW I don't believe that's true at all because a 1981 Fairlane 4.9L don't out perform a WB 5.0L Statesman do they.

XD-E 4.9L 140KW 4500 /344NM 3200 9.2:1
VC- WB 5.0L 126KW 4400 /361NM 2800 9.2:1
XD-E 5.8L 149KW 4300 /415NM 3000 8.9:1

I have to run to a car show now.
castellan Offline
#3 Posted : Monday, 17 April 2017 11:59:42 AM(UTC)
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I have XC 4.0L as 92KW 3700 /288.5NM 2400 8.9:1 in a Sep 1976 Wheels book with all the XB engines rated in DIN so it claims.XB 250 as 83KW 3500 / 280NM 1250 9.1:1
XB 200 as 71KW 4000 /220NM 1800 8.8:1
XC 3.3L as 80KW 4200 /220NM 2000 7.9:1

XB 302 as 119KW 4400 /340NM 2500 9.2:1 2 Barrel I believe it's 9.4:1
XC 4.9L as 151KW 4600 /364NM 3000 9.2:1 4 Barrel

XB 351 as 132KW 4200 /412NM 2200 8.9:1 2 Barrel I believe it's 9.1:1
XB 351 as 160KW 4400 /409NM 2900 ' '4 ' '
XC 5.8L 162KW 4500 /429NM 2700 8.9:1 4 ' '.

When looking into the F100 data from 1974 you get Net power figures even up to the years of the XD-E Falcons, but the Falcons only use the SAE Gross figures, that is a bold claim that can hide a lot of reality in what the engine does truly produce in one car to another, when looking at the 1974 to 1978 250ci in the F100 you find 3 variations of the same log head 250ci engine that the XB comes with, so I wonder why is this was the case, maybe they changed exhaust types ? what's going on ? but remember the XB 250 ended in July 1976 but she still goes on in the F100 and Transit till 1978 and from mid 1978 they get the X flow.

I think from 1984 the F100 4.1L is rated as the Falcon, but I will have to look at my notes to check that out for sure.
castellan Offline
#4 Posted : Thursday, 11 May 2017 11:31:05 AM(UTC)
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I found some brochures I is a 1974 Transit with 200ci 8.0:1 low compression with the power figures in DIN Gross and DIN Net figures.
Gross 114HP 4600/ 170LB 2000
Net 91.9HP 4000/ 155LB 1800
This runs a 4.62 diff ratio with 14in wheels 3sp manual or auto.

And a 1974 F250 250ci 9.1:1 compression brochure had
Gross 146HP at 4000 RPM / 226LB at 1600 RPM
Net 107HP at 3600 / 200.6LB 1600

The same 1974 Brochure has F250 302 V8 9.4:1 at
Gross 177HP at 4500 RPM / 259LB at 1800
Net 128HP at 3900 / 229LB 1800

The XB Falcon 250 has 155HP and the V8 302 is 240HP as rated in what ? SAE HP nonsense, because how can a 302 pump out 240HP with the 2 barrel carby it has, when the Holden 308 is rated at 240HP with the 4 Barrel.

And I never seen no stock XB 302 beat a stock HQ 308 back in the days, I thought that the 308 were a much more powerful than the 302 once, thinking that all 302 would of been 4 Barrel but then my brother got a XB GS 351 ute and I seen she only had a 2 Barrel on it and a mates 302 ZF Fairlane only had a 2 barrel on it, so bingo the penny dropped.
Even my Dads 1971 400 V8 LTD Galaxie had a 2 barrel carby on it.
A Valiant with a 245 or 265 2 barrel could hose off anything back in the day, bar a 308 or 351.
So I was thinking that the power figures must be crap even back then.

But how do we get the difference in power figures between the XC and the XD V8's
XC 4.9L 151KW to 140KW in the XD nothing is different.
XC 5.8L 162KW to 149KW in the XD ' ' It must be from DIN Net to DIN ? Another newer set standard.

And then I have another problem with the Holden figures in 1999 with the 179KW 5.0L V8 the VT show the same figures as the VS do, but the 179KW VS only comes with a crappy single exhaust and the VT is twin exhaust and I have driven both and the heaver VT flogs the VS.
But from the 2003 VY Series 2 Holden uses ECE Power figures, this being more evolved than before test, so we have this progression evolving.

The old SAE figures could be diddled easy and the facts prove it was done and that's why USA brought out the Net HP standard to catch out the cheating done as the emission laws called for more realistic values.

Sure the SAE were mainly correct as they go but they could jet the engine up and fiddle with the timing from standard to get better results, but for one thing I agree on as Byron has pointed out, that he likes this old SAE standard because it makes pointing out the old Chevy engines easy as to what engine it truly is to identify.

So in the end I see the figures are all as they claim in respective to what they are under, but I prefer gaffs plotting out the torque and power so I can understand what it going on better than just rubbish like maximum figure.

I found that my 235KW VY SS ute could out perform my mates VY Series 2 SS 245KW ute and another mates 250KW VZ SS ute and that's just by using the same gear in runs, I found that the torque had more to do with performance higher up in the gearing ratios, the 245 and 250KW engines make their max torque at higher RPM and a bit more but if I could get gaffs of them I am sure my 235KW must be making more at some points in the rev range.
The VZ SS sedan came with a lower diff ratio 3.73 than the VY 3.46 ratio, now why was that I wonder ? because the truth is she did not perfume as well due to the stricter ADR Law, most likely retarding the cam timing to comply and this makes the HP go up but lose some torque down low mid range by rights.
The VZ SS ute got the 3.46 diff ratio and that make went and got 3.9 ratio put in, this helped in some ways but not after 210KM/H my VY would just kill his for dead and we had dirt bikes in the back, his straight in line and mine sitting sideways, his had ran out of grunt in 5th gear at that speed and mine could wind out to 260KM/H in 5th and his 6th gear was useless.
I think I could only do around about 180KM/H in 6TH.
I thought that the 250KW was going to kill my 235KW wen we first went out, but I wanted to see by how much, but my 235KW had him Roo Ted, so he tossed in the 3.9:1 diff and only got me from 1st and 2ed gear.

AS for bikes gearing I had a stock Kawasaki KLX650R and mate a XR500 with cam and high comp piston they were about the same in taking off and to top speed, but I worked out that if I went 1 tooth less on the rear sprocket it should perform better and it did, old mate never ate that many rocks and it was due to using the torque better of the big 650, but on my Suzuki RMX250 I put 1 tooth more on the rear and she performed better.
I would sit down and do the math and try work out what's best to do with the gearing and what I felt would work and I had to because most riders were mainly only little short arse 6ft or less and I was not having them beat me, f that for a joke.
HK1837 Offline
#5 Posted : Thursday, 11 May 2017 3:33:28 PM(UTC)
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I like SAE Gross as it is the ONLY way you can compare actual engines, as the figures are not affected by air temperature, air pressure, fuel octane, exhaust, air cleaner, different size alternators etc etc. It is a controlled laboratory test that shows the actual POTENTIAL of an engine and it allows you to compare engine to engine.

Net rating especially the DIN "as installed" ratings (and later) allow you to compare CARS. These ratings are affected by induction, exhaust etc. They allow a consumer to compare what they are buying. Of little use (essentially useless) when you are looking at the historical evolution of an engine from start to finish or even from platform to platform. If all engines are rated SAE Gross, and in the absence of factory dyno curves you can at least compare a 1961 283 FI SBC with a 1970 Z28 350 SBC engine without having to think about what the car was installed in, what exhaust was on it and all sorts of other useless data. The only thing you have to worry about for example with SBC's is what exhaust manifolds are fitted - a 1970 Z28 is 360hp SAE Gross in a Camaro, and in a Corvette as an LT1 350 with the bigger Ramshorn exhaust manifolds, 370hp SAE Gross. If you compared these engines as DIN or other net figures, you'd make no sense of the figures as you have to take into account the different air cleaners, different exhaust, different water pumps and alternators etc., despite them being identical engines other than the exhaust manifolds.
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castellan Offline
#6 Posted : Saturday, 13 May 2017 12:00:53 PM(UTC)
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I Agree.
castellan Offline
#7 Posted : Tuesday, 23 July 2019 11:23:45 AM(UTC)
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I think that the XC V8's are using dual exhaust for the DIN figures and that the XD V8's have only a single exhaust and that has to be were the power figures are lost.
XC V8's dual exhaust look to be an option, so the real XC with single exhaust would be much like the XD.

I know that the XC and ZH when they went to the oval ford badge had jetting changes in the V8's and went better then the early XC V8's
Back in 1982 One woman I know had a early XC GXL 5.8L 4sp with dual exhaust and stock standard could only do 200KM/H and a mates old mans early ZH 5.8L only did 200KM/H stock standard with dual exhaust but then another mate had a Late ZH 5.8L with dual exhaust and stock standard it could do 210KM/H he said and then that engine auto and diff and exhaust all went into a mates XC Falcon and yep it did 210km/h.

So I do believe that the later XC ZH performed better as to Jetting and maybe dizzy timing, Just as it was with the Late HX engines I believe.


But I have never seen a Black block in any XC factory be it V8 or 6 as one dude had a last of the XC 4.1L and it was blue engine block and head.

The only Black block engines that could of been put into a XC would be Ute and P van as they did not make them XD ute and P van's until some months after the XD came out.
HK1837 Offline
#8 Posted : Wednesday, 24 July 2019 8:55:41 AM(UTC)
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It is odd that Ford would not do what GMH did once DIN figures were quoted, and quote both dual and single exhaust power figures. Most Commodore and WB around then did.
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castellan Offline
#9 Posted : Wednesday, 24 July 2019 1:24:48 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
It is odd that Ford would not do what GMH did once DIN figures were quoted, and quote both dual and single exhaust power figures. Most Commodore and WB around then did.


The XC and ZH and P6 LTD were optional Dual exhaust I believe and they came out in 1976 so I would say that they just use the max figures like they did as this was more advanced figures at the time than GMH put out in 1976.

But the VB Commodore being a new car used an updated figures for the time late 1978 and they had options of dual exhaust, where the XD at the time being a new model 1979 did not have exhaust options.

All car makers use what ever power figures they want, we can see that GMH used a more advanced ECE KW figures from VZ on and Ford only used DIN KW to the end of the Falcons.


One can see the Landau and P5 LTD have single exhaust or Dual from factory with the rear bumper and bottom panel made to fit for the Dual exhaust.
And the XC has only the rear bumper set with Dual exhaust from factory with that option or you only get the single.

The XD sedan tank is in the way of having a dual exhaust option. but you can fit dual to them yourself. I think it's because to pass the noise ADR laws they need a resonator in the tail and you cant put two of them in.

The Highway patrol XD and XE got a green 5.8L lettering on top of the air filter, must of been a different carby jetting I would think or less ADR for NSW at least. and I remember the cops getting right up them in 1st and 2ed going past me sitting on side of road and it sounded just like they had the air filter replaced with a fully open after market one, growling away and them std air filters do not sounds like that at all. they growl a bit std but not like I heard. but exhaust was quiet as could be.

The normal XD-E V8 got blue lettering on top of air filer lid or red, red for 5.8L and blue for 4.9L or was it red for 5.8L ?


As for the stock XC 5.8L even with dual exhaust vs a XB 351 GT in reality the XC 5.8L did not perform as well, yet XC figures say it has more power and maybe it has but the GT XB had more grunt torque in reality and went much better as to what I had driven and the XA GT clearly better again but more rev able power over 4500RPM.
HK1837 Offline
#10 Posted : Wednesday, 24 July 2019 2:19:33 PM(UTC)
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I guess those end of XC engine change figures could be like the HZ 5.0L, where it changed compression (from 9.7 to 9.4:1) with release of VB engines but it is not well documented - you have to really dig into GMH literature to find any mention of it in HZ, and even then figures remain as SAE net whereas VB is quoted differently.
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#11 Posted : Thursday, 25 July 2019 5:06:21 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
I guess those end of XC engine change figures could be like the HZ 5.0L, where it changed compression (from 9.7 to 9.4:1) with release of VB engines but it is not well documented - you have to really dig into GMH literature to find any mention of it in HZ, and even then figures remain as SAE net whereas VB is quoted differently.


Yes because it's a same model car so they don't do it, so the early HZ is just like the late HX engines and no one knew that the later HZ ones were even better. or that the 6 cyl had the blue motor rods, that people claimed to be starfire rods, thing was when the moonglow 4 came out the old rods were finished being cast and only the all updated rods came out at the same time.
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#12 Posted : Thursday, 25 July 2019 5:38:07 PM(UTC)
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Only really early HZ will have HX engines, like just pilots. They changed a fair bit, but not much changed during HZ apart from the use of XT5 (blue) blocks around VB release and the compression dropped on 5.0L. The first A9X or two got a HX style engine too, and the rest were HZ style.
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#13 Posted : Friday, 26 July 2019 3:15:02 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
Only really early HZ will have HX engines, like just pilots. They changed a fair bit, but not much changed during HZ apart from the use of XT5 (blue) blocks around VB release and the compression dropped on 5.0L. The first A9X or two got a HX style engine too, and the rest were HZ style.


I have seen the 3.3L on the block of a VB Commodore with a red head but some what different casting I took a photo of it but can't Zoom in on the part number, but where the exhaust manifold meet the head casting, the head casting just slopes off down flat like, but all other red heads are not like that their at all.
And I seen a late HZ one tonne the same with 3.3L cast on the block, all original.
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#14 Posted : Friday, 26 July 2019 7:12:56 PM(UTC)
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I don't think it is unusual to find red blocks with 3.3 on them. I've seen lots of them. There isn't much different between XT4 and XT5 engines in terms of blocks, the XT5 V8 blocks were introduced with VB volume production, may well be that 6cyl were similar, or at least some of the patterns were changed early. It happened with late WB 6cyl too, if you go and look at late WB 6cyl engines they are VK blocks painted blue.
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