Series 2 931 (81-82) has 22.2 gallon tank?
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Series 2 931 (81-82) has 22.2 gallon tank?
Can anyone confirm that and can you swap it into a 924 or early 944/924S? If you can, how about the gas gauge and sender compatibility?
#2
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I take it you're looking for a smaller gas tank for racing? In that case, you might prefer to use a 924NA (2.0L) gas tank. Per the spec booklet, the 2.0L NA 924 has a 62L tank (w/ 5L reserve), whereas the 931 has an 84L tank (w/ 9L reserve). Also, from the 944/924S spec booklet, the 924S shows a 66L/9L reserve tank, whereas the late 944's show an 80L/8L reserve tank.
62L is 16.4gal, 84L is indeed 22.2gal.
Senders will be compatible; the '81 931 I just recently sold had a bad gas gauge sender, and I swapped in one from a 924S (after confirming the cross-reference in PET).
For install, I do expect they would be interchangeable. The #1 concern would of course be trans clearance, but all these cars use the same trans except the 2.0L NA cars, in which case, for the 4-speed trannies, the trans is smaller... some potential for lack of fitment, but unlikely. If the 4-speed and 5-speed 2.0L NA 924's all use the same gas tank p/n, then no worries. The only other concern then would be to ensure you have the tank mounting straps that came with the tank you're installing - they might be different (though again should be easy to confirm with part #'s).
62L is 16.4gal, 84L is indeed 22.2gal.
Senders will be compatible; the '81 931 I just recently sold had a bad gas gauge sender, and I swapped in one from a 924S (after confirming the cross-reference in PET).
For install, I do expect they would be interchangeable. The #1 concern would of course be trans clearance, but all these cars use the same trans except the 2.0L NA cars, in which case, for the 4-speed trannies, the trans is smaller... some potential for lack of fitment, but unlikely. If the 4-speed and 5-speed 2.0L NA 924's all use the same gas tank p/n, then no worries. The only other concern then would be to ensure you have the tank mounting straps that came with the tank you're installing - they might be different (though again should be easy to confirm with part #'s).
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Ok, thanks, Vaughan.
I got all that. What I want to do is put the larger 931 (22.2 gals) into a 924S (stock is 17.4 gals) for endurance racing. The 931 tranny is the same unit except for the missing top mount tunnels used in the late cars. I figured I'd need different straps but just needed to ask if I was missing something else that would prevent me from putting the larger 22 gal tank into a 924S.
I could then just swap the 931 sender and gauge over to the 924S chassis?
I got all that. What I want to do is put the larger 931 (22.2 gals) into a 924S (stock is 17.4 gals) for endurance racing. The 931 tranny is the same unit except for the missing top mount tunnels used in the late cars. I figured I'd need different straps but just needed to ask if I was missing something else that would prevent me from putting the larger 22 gal tank into a 924S.
I could then just swap the 931 sender and gauge over to the 924S chassis?
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You shouldn't even need to swap the gauge, just the sender with the tank (or keep your existing sender) - just make sure the "new" tank is cleaned thoroughly, they're usually full of rust, of course!
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Shouldn't the sender have to stay with the tank? A half tank tank reading in a 22 gallon tank isn't the same as a half tank reading in a 17.4? Different resistance signal to the gauge?
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No. I mean if the tank is shaped differently, which it must be because it's almost 5 gallons larger, it makes sense that the sender would have to stay with THAT tank.