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Old 07-30-2020, 05:16 PM   #67
Pete
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Join Date: May 2010
Location: Wa.
Posts: 3,877
Default Re: Let's build a drag race 8BA engine

Quote:
Originally Posted by frnkeore View Post
This question is more for Pete and Kiwi.

I have a high end dyno sim. I had already run it with my above 21 stud info, using a 59A cam. I estimate that I will be able to get at least 9.2 CR out of it so, I changed out the cam to Howards 260 @ .050 x .440 lift cam on a 110 LSA. With that I got 239 hp @ 5400 and 255 lb ft @ 4400. I then advance the cm 5 deg and got, 237 @ 5400 and 258 lb ft @ 4000. Note that the advanced cam, gave 3 more average hp and 4 more average TQ.

The program gives you a flat head block to start with, I added a 1.6 exhaust valve to it but, left the intake alone because it's hard to make improvement with it. Headers where as short as I could make them, to have a realistic exhaust. 14.4 primarys and 3.2 collector. Not ideal, I know.

What do you think about the HP / TQ and rpm levels?
On a 1/4 mile dirt track I would gear it to run from 4000 to 6100.
With a good car, you should be able to flat foot it all the way.
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