Steve, Thanks for your response.
I was at Porsche Motor Sports for an open house this year and not one of the 3.8 GT3 engines had boat tailing on the cases. Not one. Don't those engines turn RPMs in the 9200 range? I have also seen both 935 and 962 engine cases and have never seen boating.
Is it your contention that GT3 engines would not benefit from a 8-10 horse power increase?
That seems like a questionable proposition.
I know an engine builder from the mid eighties ISMA Daytona winning team that claims zero benefit from boat tailing.
This builder was trying to get to 300hp from a 2.5 and only got to 296. They tried a plethora of techniques and boating proved to offer no measurable difference.
I also noticed at Porsche Motorsport. that none of the cranks were knife edged.
Can you explain these observations?
Wanye and Henry talking about moon cutting cylinders and boat tailing:
Quote:
Originally posted by Henry Schmidt
....................
For my money, both are a tremendous waste of time and will offer no benefit in all but the most extreme racing engines. We have not been able to measure a benefit on the dyno.
|
Quote:
Originally posted by Wayne at Pelican Parts
I agree with Henry. Unless you're trying to extract one more 1/2 HP from a high-RPM race motor, it's really not worth it. I basically said this in the Engine Book too. Also included in this is boat-tailing - not a real good return on your time/effort/money.
-Wayne
|