JimV

iTrader: (1)

A 9:1 motor with a bs of .39 somthin, how do you do it?

GPM

If I remember correctly those numbers were way off because of the return style fuel regulator,I rely more on the wide band 02, A/F ratio, and EGTs. I believe on the N/A motors I was running 12.6 a/f and right around 1375 degrees. Timing would have been at 36. past 3000 rpm.

rmbuilder

GPM,
How much spring do you run with the HT 440 lobes?
Bob

GPM

I believe they are 285 at the seat and 730 open, I use the Crower 68806.

GPM

You engine builders may have me at a disadvantage here, this is only a hobby for me. I do have a question for you, what do you think the difference is between the blower motors on page one?

kennywould

Hehe...your killing me Smitty! John doesn't know it's missing yet! yep, runnin a 96/272 Baja, I seem to have a problem with the haul, haven't busted 80 yet! Should start another thread for this maybe? Do you talk as fast as you type?
-Ken

WETTE VETTE

How does runner size correlate between an injected and carbed motor? Can the runner size be smaller on an injected motor due to the fact that there is no fuel present, which takes up space? I know on carbbed alky motors runners and ports need to be huge to accomodate the large amount of fuel required. If smaller runners are used in a dry manifold it seems the ram effect can be maximized compared to using the same runner cross section as a carbbed motor. It is probably splitting hairs, but fun to talk about.

Craig

WETTE VETTE

GPM
I am no engine builder but I have a guess. Is it possible that there was a cam change between the two procharged motors on page 1?
Craig

kennywould

If your referring to the dyno sheets, the second sheet is NA motor, if your not diregard my reply.
-Ken

GPM

Kennywould you're on the wrong page. Wette Vette, It wasn't a cam change. As far as the runner size, my opinion, they should look like a funnel, and flow at least as much as the best port in the head. A stock Dart tunnel ram will only flow 354 cfm per runner. Whats the point in running a 390 cfm port,if you are going to hold it back with the manifold.