Hi H8PVMNT,
I've attached an Excel sheet for download and review.
The numbers are from the best specs and data I can find so far.
I compared the 20R stock engine and then simply added a Doug Thorley header, 2" exhaust, with a free flow muffler. The numbers support the commonly projected increase in torque and HP of about 10%.
What I find really interesting, however, is your butt dyno analysis, which is very accurate, and is supported by the numbers.
Your earlier comment.... "I am convinced the 20r is better than the 22r as far as drivability goes. Much more rev happy and feels like a better torque curve all around. I'm sure it's the head design."
I think Ted and Tod at engbldr would agree with this... You can test an engine on a SuperFlow 902 engine dyno, see lots of granular output data. Then install that engine in a NASCAR Sprint Car and the driver will have "feedback" from his butt dyno that the $50,000 902 could not analyze!
The torque numbers show the flattest curve I've seen - 3,000 to 3,800 RPMs!!!!
I am working on adding cam profiles and Weber carb. Then I will put a 20R head on a 22. I'll post those results later.
Any comments?
Gnarls.
