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Hi,
If anyone has a GMH factory HX owners manual, can you ammuse with some of GMH's marketing info out of it please?
Namely the supposed compression ratios and power outputs KW@rpm values for the HX 253 and 308 motors?
Thanks
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HX 253...Compression 9.4:1...120kw @ 4550rpm...Torque 325NM @ 2600rpm
HX 308...Compression 9.7:1...161kw @ 4800rpm...Torque 400NM @ 3100rpm
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Thanks Absinth, but just to be sure, where these directly out of the HX owners manual or a web site?
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Straight out of the owner manual..ENGINE DATA page 87. That is what you asked for!!!
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Yep Thanks, I was just trying to figure out why these specs are differern to the LX Torana specs for engines of the same vintage.
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Hi fuzzypumper
There are no full factory workshop manuals for HX, HZ, LX or UC. There were several small supplements, but no proper manuals, so you have to rely on owners manuals & sales brochures etc. Although I have found these to conflict with each |
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Just as a reference a 253 in a VH Commodore is rated at 110 kW and 115 kW for the twin exhaust. Either the pollution controls really killed the output or they changed the way the power output was measured. If it was measured without air conditioning or po |
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Hi James.
This crops up often. They used both gross & net figures in those days, where the later net figures are closer to reality.
A 253 Blue V8 & twin exhaust @ 115 kW (net) produces more power than an HQ Red 253 V8 which is rated at 185 bhp/138 k |
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Hi James.
This crops up often. They used both gross & net figures in those days, where the later 'net' figures are closer to reality.
A 253 Blue V8 & twin exhaust @ 115 kW (net) produces more power than an HQ Red 253 V8 which is rated at 185 bhp/138 |
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Thanks Dr Terry, I have since found that the Torana LX states the same figures as stated on the HX for the period between june77 & Feb 77 so my original question is mute. However my new question becomes why the pre July76 LX 253 & 308 have 130kw & 186 Edited by user Monday, 17 March 2008 10:57:25 PM(UTC)
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Hi fuzzy. The problem is that GM-H originally published figures in either SAE gross, SAE net or DIN net. There were also several variations between model series, for no obvious reason. You then get people like 'Unique Cars & Parts', who covert HP to kW Edited by user Monday, 17 March 2008 11:55:21 PM(UTC)
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Hi fuzzy. The problem is that GM-H originally published figures in either SAE gross, SAE net or DIN net. There were also several variations between model series, for no obvious reason. You then get people like Unique Cars & Parts, who covert HP to kW ( Edited by user Monday, 17 March 2008 11:55:21 PM(UTC)
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Yes that is an explaination for Unique cars figures. So that makes the 186KW 308 factory LX Torana engine is a myth.
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Hi fuzzy.
No, its not really a myth. Heres how they got it.
The HJ 308 (11/74 to 6/76) had the higher 250 bhp (gross) output. This was higher than the HQ 308 (240 bhp), because of changes to cam timing & an increase in compression ratio to 9.7:1. HX |
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Hi fuzzy.
No, it's not really a myth. Here's how they got it.
The HJ 308 (11/74 to 6/76) had the higher 250 bhp (gross) output. This was higher than the HQ 308 (240 bhp), because of changes to cam timing & an increase in compression ratio to 9.7:1. |
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Your calculations look sound and I tend to agree but I have a HJ series Owners manual here and its states 9.7to1 comp, 179Kw(240bhp)for the 308. Unless the 9.7comp ratio is a typo. Also my HZ Ownwers manual has 9.7to1 comp, 161 Kw (gross)@ 4800rpm whic Edited by user Tuesday, 18 March 2008 10:28:22 AM(UTC)
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okay fellas, page 87 of my HX owner manual nov 76, 5.0lt 9.7comp ratio, petrol research oct rating 98, taxable h.p rac or sae 51.2, gross kw 161@4800rpm, torque nm gross 400@3100rpm.
This is straight from the owner manual.
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Hi Guys.
Ive found that owners manuals in particular have the most typos. Most of my info is gained from workshop manuals (where available) & media releases. Technical service bulletins & facts books are also reliable sources.
Warren would probably |
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Rank: Veteran
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Hi Guys.
I've found that owners manuals in particular have the most typos. Most of my info is gained from workshop manuals (where available) & media releases. Technical service bulletins & 'facts books' are also reliable sources.
Warren would probab |
If at first you don't succeed, just call it Version 1.0 |
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