Hello everyone,
My name's Gordon and I come from the E9 and E36 worlds but I am fascinated at what BMW did with the S14 engine program to compete and win in the late 80s/early 90s. I have read for the past two weeks for information regarding the Group A and DTM engines but trying to find really detailed information is like trying to find a needle in a haystack! I have gone through countless posts on here, google, the Group A manual and parts catalogue and even realoem. They've answered most of my questions, just not the really detailed ones. I hope the members of this forum can help me fill in the blanks!
1) In the parts catalogue it shows the 2.3L Rally and Group A engine as the S14/1, however they have different part number cylinder heads. What was different about them?
2) Are the domes of the 2.3L and 2.5L pistons exactly the same but just with a different bore? Any difference in deeper valve reliefs or shapes?
3) Are there any pressure charts out there for the SRD5, SRD7 and SRD9 springs?
4) What was different about the Group A con rod bearings versus stock con rod bearings?
5) I read that the Group A headgasket is precompressed and reinforced. How is it reinforced? Is the gasket of OEM style material or is it like an MLS type?
6) I am having trouble finding out the compression ratios, redlines and camshaft setups for S14/1 through S14/6 engines. Can anyone help me out? All I know is the S14/1 has a 12:1 ratio and a 8500rpm redline and that the S14/4 used a 316/292 cam setup and also a 8500rpm redline I believe.
7) In the manual the S14/1's minimum fuel octane rating is 98RON, were there ever announced minimums for the other engines?
8) In all of the build threads I've read people say the BMW MS spec for quench is 0.8mm, I cannot find that in the Group A manual. Can someone tell me where to find that spec?
On a side note, I see many people running Arrow, Carrillo and Pauter rods, but I haven't seen anyone running Muzzi Motorsport's 450g rod. Is it a price thing or is that rod made to last only 2 race weekends?
Any help is much appreciated. Thanks!
My name's Gordon and I come from the E9 and E36 worlds but I am fascinated at what BMW did with the S14 engine program to compete and win in the late 80s/early 90s. I have read for the past two weeks for information regarding the Group A and DTM engines but trying to find really detailed information is like trying to find a needle in a haystack! I have gone through countless posts on here, google, the Group A manual and parts catalogue and even realoem. They've answered most of my questions, just not the really detailed ones. I hope the members of this forum can help me fill in the blanks!
1) In the parts catalogue it shows the 2.3L Rally and Group A engine as the S14/1, however they have different part number cylinder heads. What was different about them?
2) Are the domes of the 2.3L and 2.5L pistons exactly the same but just with a different bore? Any difference in deeper valve reliefs or shapes?
3) Are there any pressure charts out there for the SRD5, SRD7 and SRD9 springs?
4) What was different about the Group A con rod bearings versus stock con rod bearings?
5) I read that the Group A headgasket is precompressed and reinforced. How is it reinforced? Is the gasket of OEM style material or is it like an MLS type?
6) I am having trouble finding out the compression ratios, redlines and camshaft setups for S14/1 through S14/6 engines. Can anyone help me out? All I know is the S14/1 has a 12:1 ratio and a 8500rpm redline and that the S14/4 used a 316/292 cam setup and also a 8500rpm redline I believe.
7) In the manual the S14/1's minimum fuel octane rating is 98RON, were there ever announced minimums for the other engines?
8) In all of the build threads I've read people say the BMW MS spec for quench is 0.8mm, I cannot find that in the Group A manual. Can someone tell me where to find that spec?
On a side note, I see many people running Arrow, Carrillo and Pauter rods, but I haven't seen anyone running Muzzi Motorsport's 450g rod. Is it a price thing or is that rod made to last only 2 race weekends?
Any help is much appreciated. Thanks!
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