Please help me debunk the S3 vs. S4 motor
#31
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Rennlist Member
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When S3 pistons (US version, not Euro 32V S) are cut for 968 valves (all 4 cuts) CR drops to 10.5-10.6:1. I'm currently building such setup. It will have GTS heads with 39mm 968 intakes, S3 cams with 0.5mm base lobe reduction (10.5mm and 9.5mm valve lift), MSDS headers and 928Motorsports X-over.
#32
Nordschleife Master
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Fuel pooling issue is very local in these engine since the injectors are so close to the valve. I don't think it's very relevant for the intake porting.
Caveat lector.
#33
Nordschleife Master
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One trick they don't mention (which is somewhat contentious) is Singh Grooves cut into the quench area?
But I know even less than Tuomo, and am too easily swayed by innovation over tried and tested, so chances are if I tried to build an engine it would explode on first start. However, if I could persuade someone else to do it and give me their build notes should it succeed, I'd be happy to try it![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
But I know even less than Tuomo, and am too easily swayed by innovation over tried and tested, so chances are if I tried to build an engine it would explode on first start. However, if I could persuade someone else to do it and give me their build notes should it succeed, I'd be happy to try it
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Just make sure you don't confuse me with an expert... ;-)
I too try new things way too easily.