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Join Date: Nov 2001
Location: Edwardsville, PA, USA
Posts: 35
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1987 924S motor into 1987 944
I found a 1987 2.5L 924S motor with low miles to put in my 1987 944. It's the same size as the 944 engine, but I noticed the compression is a little different. The 944's 2.5L has a ratio of 10.2:1 and the 924S is 9.7:1. Will I have to modify anything to get that engine to work properly in the 944? The engine is just a long block so would I need the 924S computer, harness, etc...?
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12-17-2001, 11:07 AM
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Location: Longwood, FL USA
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Do you havea reason for wanting to do this?
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12-17-2001, 12:51 PM
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Location: LI NY
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924s engine is detuned as to not interfer with 944 sales detuned is NO GOOD...bad idea...look for a turbo engine..
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12-18-2001, 08:25 AM
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Location: Londonderry NH
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turbo enigne
Bolting in a turbo engine would be much more difficult. 924S was detuned but still would work. Also if you look at tests for that time... the 924S actually outperformed 944. Yes 924 a bit lighter and smoother body... but this can not account for it all. There was a transmission difference in final drive. Porsche was attempting to make the 944 quicker than the 924S but failed.
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12-18-2001, 08:43 AM
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Whoa... if you are talking about US cars, then the engine outputs should be identical. As far as I know (and from all my info), the 87 924S has the *same* engine as the 87 944. In the US, both the 924S and the 944 had de-turned motors. Normally the Euro 2.5 liter pumped out 163 hp, because of the higher compression ratio, and not 147 hp as in the US. It was Europe where Porsche detuned the 924S down to the standard US spec 944 motor. The compression ratios of both these cars should be the same in the US, at 9:7. (the chips should be identical too... my 87 924S's engine electronics are identical to an 87 944... it even says "944" on the box)
If you look at the hp and torque figures for the 87 924S and the 87 944, you'll see that they are the same. (However... the 88 924S has the higher compression Eurospec engine) -MAS |
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12-18-2001, 12:21 PM
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I was under the impression that the 924S engine was had more resmeblance to the early 944 engine. Not the same as the later 944 engine.
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12-18-2001, 02:25 PM
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No... an 87 924S is essentially identical to an 87 944. The main differences are:
1) The 924S has (some of) the pre 1985 1/2 interior and dash. Except the VDO gauges have white lettering and not yellow. 2) No fender flares. 3) Narrower tires (195s were stock). 4) Different 5th gear ratio. 5) Slightly lighter weight. 6) Slightly more aerodynamic. 7) The trailing A arms of are the same as an 86 944 (and not aluminum, as with the 87 944). 8) Slightly smaller rear spoiler (a larger one is not needed, because of the more slippery shape). The engines are identical. One way you can check fast on the web, is to look at the sites that offer upgraded performance chips for Porsches. You'll see that the 87 944 and the 87 924S have identical requirements, ie: same chips. Earlier 944's cannot be "chipped"... at least not with a simple plug in. -MAS |
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12-18-2001, 07:28 PM
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Location: Edwardsville, PA, USA
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Right on this site in the technical specifications of the 944 and 924s you can compare the specs.
The 924S same displacement as the 944, only the compression is diffferent resulting in 157 hp in the 944 and 150 hp in the 924S |
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12-18-2001, 08:30 PM
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I know that the 924s and 944 are similar, but the 924S's make up does resemble an early model 944 more. The suspension is the same as the earlier cars. Also, the engine wouldn't effect whether you can chip it, it's the DME. So it could have an early engine and a different DME. Either way, it's not a big deal.
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12-18-2001, 11:29 PM
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Well... it is more of a big deal to "chip" an earlier engine.
I've lost count of the number of posts I've seen here from members who want to chip an 83 944, only to find out that it doesn't just "pop" out for easy replacement. -MAS |
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12-19-2001, 01:13 AM
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Location: Brighton UK since 11/2012
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All 924S models have the aluminum trailing arms of the later 944
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12-19-2001, 08:15 AM
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I stand corrected about the suspension, but about the chip; re-read my last post. The DME is the problem, not the engine. Anyway, I am gonna stop before I make myself anymore of an ass
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12-19-2001, 10:09 AM
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Yeah, sorry Rollins... I misunderstood you.
-MAS |
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12-19-2001, 10:56 AM
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"All 924S models have the aluminum trailing arms of the later 944"
Not according to Car and Driver (924S road test 86). Who knows though? I wouldn't be surprised if the earlier ones didn't and the later models did. -MAS |
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12-19-2001, 10:58 AM
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