cranking compression

[SSDiv6]

Originally Posted by junior barns

what happens when you have no scoop and not much hood to carb clearance?

You have reduced airflow.

[randy wilson]

We have been bigger on the jets, this is what it likes. Thanks guys, we will figure it out.

[Mike Taylor 3601]

Randy,
As far as cam advance goes all I've seen on dyno is when advanced gain a few pounds tq lose few hp lower peak 100 or 200 rpm ,retard exact opposite lose few# tq gain couple hp raise peaks 100-200 rpm. IMO cam timing changes are better tested on track
my experience with stick cars is advanced cam timing does'nt seem to work well they sound better better response but just don't want to go anywhere,also when you opened lash you lost a little duration and overlap that can tell you some info about your cam,usaully it takes .005 increments to show try tighten intake .005 loosen exhaust.005 from recommened settings if that works I promise you have HP&TQ in cam change PM me if you do I tell you who will fix that cam for you.
Hood Scoops will sure mess with jetting,speaking of jets if useing holley jets DON'T they are not accurate you can change them and get no results or opposite of what you should.
Convert to Max Jet they are precise when you make change you get results.
One other thing dyno numbers are corrected hp &tq., second,do you know for sure #'s are'nt adjusted for desired results. PS manipulated #'s from correction factor usaully gain lots of tq.
Mike Taylor 3601

[junior barns]

Originally Posted by SSDiv6

You have reduced airflow.

Thanks for the reply, but what I was getting at is: well I guess less airflow means less fuel! I have had similar results before in the past.

Sorry not trying to hijack this thread but how much carb clearance should there be and where to measure from off the carb??

[randy wilson]

Thanks Mike, I am going to put cam back and tighten lash after we are done racing. Do i think numbers are bogus? No. I have been with this man 13 years, and if he said we gained, we gained. Ran this weekend at Eddyville, went 5.90 116.70. Had the best mid track numbers of our car ever, but still down 3 mph and .007. I think it's as simple as you have stated, clutch cars do not like the cam advanced sometimes. Now, on the valve lash, i have seen .002 make a difference. As for the jets, we are using holley, but will change to max jets. We were no. 2 qualifier, at 2 under, Rick Parrot ripped everyones throat out at 32 under. So we have some work to do.