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Last Post 15 Nov 2011 11:03 PM by  edfishjr
Classing of a 1987 Porsche
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dolfan
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09 Aug 2011 09:53 PM

    I'm looking at a 1987 Porsche 944S, the car has had an engine swap for a 2.7l engine. My initial intent is to use the car for club trials then time trials before ITS, but wanted to make sure that this engine swap doesn't move the car to a different class.

    Based on what I see a 1989 2.5l 944 would need to make weight of 2850, but the 1989 2.7l 944 is at 2635 for weight. Not sure how this works?

    JSirota
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    10 Aug 2011 01:03 AM
    The car needs to credibly be the same as a 944S except for the allowed changes.

    In other words, if you want to race a 2.7L 944, you can start with a 2.5L but the car you end up building has to be identical to one that you would have if you had started with an 2.7L. Then you'd race it at 2635. I don't know enough about the 944 to tell you if that would be legal or not but I think it would, it would come down to the differences between the 944S and the 2.7L 944.

    I'd recommend you post over on improvedtouring.com, that's where the IT guys hang out.
    EricH
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    15 Nov 2011 09:16 AM
    Mike wrote:

    I'm looking at a 1987 Porsche 944S, the car has had an engine swap for a 2.7l engine. My initial intent is to use the car for club trials then time trials before ITS, but wanted to make sure that this engine swap doesn't move the car to a different class.

    Based on what I see a 1989 2.5l 944 would need to make weight of 2850, but the 1989 2.7l 944 is at 2635 for weight. Not sure how this works?

    You could run the car in that combination in STU at a weight of 2970 or use the 2.5L engine and run at 2750. STU allows lots of freedom of development.

    Scootin159
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    15 Nov 2011 10:27 AM
    There's VERY minor differences between a 1989 944S and a 1987 944, and most of them would be scrapped in IT prep anyways. The big things I can think of though are the torque tube (i.e. "driveshaft") has a slightly different bellhousing on it. I've been too long removed from the 944 world to remember if it's due to engine or transmission fitment, but I do know it's because one end or the other is a slightly different shape making the total torque tube length different between the "S" and "non-S" cars, necessitating the special torque tube. If this is engine side though, it was likely included in the 2.7 swap already (as it would be necessary for the engine to fit), but if it's transmission side then it would only be there if the transmission was swapped as well. On that note - the S also has a different clutch setup inside that bellhousing, and different gear ratios.

    I'd also double check that the wheel hubs are the same - I think they are, but there may be a slight difference.
    edfishjr
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    15 Nov 2011 11:03 PM
    I have no knowledge of IT rules, but some info:
    1) no 1989 944S. The 944S was only 2 years, 87 & 88.
    2) in 1989 you could get 3 944s: 2.5 turbo, 2.7 944 and 3.0 944S2. This was the only year in the US for a 2.7 engine.
    3) the 944S was a 2.5L with 4 valve head (later used on the 944S2.) There were block and rotating assy changes as well as the other things mentioned.

    So, a 1987 944S with a 2.7 engine must be an engine from the year 1989, if it is an original, Porsche-spec engine. (It could also be a bored or stroked 2.5 motor.) The intakes are massively different between the 944S and 2.5/2.7 944 motors.
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