Header design

The results for a 1.6 VW motor look to be pretty similar to what Stahl sells for a header. I couldn't figure out what length to make the exhaust after the collector, did i just miss that in the calculator somewhere?

Jeff your motor is basically two banks of 1.8 liter 4 cylinder motors, right? With a fairly low peak HP RPM, and not really high peak HP number either, right? That size primary might sound about right. I think the vast majority of all commercial headers are probably way too big, the size is a marketing tool...
 
Ron and I have thought this for a while. "Old school" thinking was bigger is better. Now, smaller primaries is thought to increase exhaust gas velocity and therefore scavenging. I agree with you, smaller is probably better on a low rpm hp peak car.

I saw your pm. I'll get you the information I have here shortly.

evanwebb said:
The results for a 1.6 VW motor look to be pretty similar to what Stahl sells for a header. I couldn't figure out what length to make the exhaust after the collector, did i just miss that in the calculator somewhere?

Jeff your motor is basically two banks of 1.8 liter 4 cylinder motors, right? With a fairly low peak HP RPM, and not really high peak HP number either, right? That size primary might sound about right. I think the vast majority of all commercial headers are probably way too big, the size is a marketing tool...
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