Please help me debunk the S3 vs. S4 motor
05-12-2010, 11:28 AM
#31
Addict
Rennlist Member
Rennlist Member
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.
05-12-2010, 01:01 PM
#32
Nordschleife Master
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.
05-12-2010, 01:04 PM
#33
Nordschleife Master
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
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
Just make sure you don't confuse me with an expert... ;-)
I too try new things way too easily.
