"Richard Riley" wrote in message

Assuming what RPM and compression ratio? Are you using numbers that
are perfectly reasonable for a street rod, but are higher than the
airplane guys are willing to fly behind?


Richard

Good question. Since RPM is in the equation, I should certainly specify.

Blanton used a self imposed limit of 4800 RPM, so that is what I used as
well. It is very close to the HP peak when using the Blanton cam. A the
standard street/race cam that is used on dyno2000 yields 302 HP at 6000. A
bit high for our purposes even with forged internals. But at 4800 it shows
262 HP. Blanton's plans derate this a bit and only claim 230 hp.

As for compression ratios, I have run the simulation assuming compression
ranging from 9:1 to 10.5:1 - At 5000RPM, 9:1 yields 261 HP, while 10.5
yields 296 (both at the flywheel). Needless to say, I'll stay with the lower
ranges.

Note that I can make it show 160 HP just as easily. A 2 barrel 300 cfm carb
and stock low heads, cam and shorty headers are all it takes.

This desktop dynamometer program- if it can be trusted - is a wonderful way
to know what to upgrade and what to leave alone. I have references to a
couple of engine building competitions in the past couple of years where it
helped new guys compete with people who have been around for a long time,
and hit the HP figures dead on.