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Hi all, i have a 65 mustang atm and im currently on my Ps. i was just wondering which motor would perform the best in terms of hp..etc. i currently have a 200 inline and a 250 crossflow sitting in my yard. if i was to put a 250 2v head and manifold onto the 200 and work it more..would that be better than a 250 crossflow worked? (cast head)in terms of horsepower and gains.. i would like to see your thoughts.
cheers
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250 with aloy head is the way to go maybe even an EFI one.
A 200 with a 2V head compression would be low and regardless of how much you work you do to the 200 they will never be as good performing as the holden 202.
If you have an original 1965 200ci with 7 mains like our XR 200 they are better than the XY to XB 200 for power making but for $ spent just pick up a EFI 4.1L better on fuel and power.
If you work your carby 250 an alloy head is the only way to go as you can get away with more compression that way.
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I had a Cortina 6 with the 200 motor it was rubbish gutless and t-h-i-rs-t-y with my 15 foot caravan on was getting less than 12 mpg and top speed of 50 mph, with head wind lucky to get 40mph
apparently the 250 has a lot more going for it tho i have never had one. my eh with a 173 motor and powerglide would kill it.
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p.s. it had a 3 speed floor change manual box. weighed a ton. or tonne.
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The old XR 200ci has a better torque range than the cortina with it's XY to XB 200 in std form due to rod ratio just like a 302 cleveland is not the best ratio. you use a windsor 302 they have a better rod ratio for the best performance not a cleveland 302.
But it's the heads that are the main problem on the old log type 6 cyl.
The 250 blocks are made for 250ci not 200 as the 200 is just an cost cutting thing as was our aussie 302 cleveland.
The USA never made a 302C and the USA never made a aussie type 200ci they use the old XR 200ci block rod ratio.
For australia to make both blocks 200 and 250 would cost much more as the same thing if they made a 302W and a 351C.
So we aussies had to make compromised with the 200 and 302.
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Those 4.1 EFIs with a manual box behind them are very under-rated for what they are. As a young guy in the late 80s & early 90s, I saw first hand a number of early commodore V8s - both 253 & 308 being handed their backsides by a mate's dad's XF 4.1 S-pack with EFI & a 5 speed. It hauled ass.
In the late 90s we had an '81 LTD with a 351, and a mate had a ZL 4.1 from the southern highlands that was hit up the butt. We bought it to wreck out (another mate wanted the EFI motor, and I wanted the window motors & stuff). Both cars were stock standard, and the 4.1 EFI kept up with the 351 (admittedly it was one of the last smogged-up examples, but it still showed how good they were. In the end, that motor went into an XE with a 4-speed behind it. I wired it up for EFI (it was ULP, so it had the EECIV computer, not the earlier Bosch system). The guy's son got hold of it on his P-plates & terrorised the neighbourhood in it.
These days you probably wouldn't bother with a 4.1 conversion, as you'd simply go straight to a BA-era 4.0L DOHC (with the option of a turbo too) if you wanted to do a retro-tech swap, but as a legal engine in the mustang for a P-plater to drive, I think you'd be mad not to find an XF EFI version & drop it in. Even if it's only the XF's top end, cam & EFI hardware fitted to an older 250 block, to keep the older era engine number. |
Cheers,
Mick
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Unfortunately you cannot fit a 4.1 crossflow head to a 250.
The crossflow block is wider where the pushrods go.
I'd go an alloy head 4.1 or EFI 4.1 too if it were my choice.
A few years ago my brother had a 4.1 rebuilt with a compression boost & mild cam to suit LPG & put it in his XY wagon.
It would embarrass a fair few V8 drivers.
Later he discovered that an EFI inlet manifold was a straight bolt up to his Gas Research mixer so He fitted one of those to it with the injector ports bunged. It flowed better than the carby manifold did & looked way cooler.
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thanks all for the replies, i also have been finding that some are changing the efi's to carb's? why is that?
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quote:
Originally posted by richo1
thanks all for the replies, i also have been finding that some are changing the efi's to carb's? why is that?
Just drag racing or idiots.
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