| DaleTx |
01-20-2013 12:42 PM |
I have used a couple of the Holley HP carbs in the past on 350 small blocks. After reading the posts on your carb settings I went out and checked the settings on my carbs. The Holley 650 HP with mechanical secondarys that I ran on the Camaro had the idle mixture screws at ¾ turn out. The Holley 750 HP I ran had the Idle mixture screws out 1-1/4 turn.
The pump discharge nozzle I used on the 650 HP was .029 on the primary and .031 on the secondary. The fuel pressure was 5 psi for the tune. I tried a higher pressure fuel pump one time (7.5 psi) and it threw the tune off. The carb was very sensitive to the pressure change.
I agree with Greg about dialing in the tune on the chassis dyno… saves a lot of time and you get to see the results of the changes on a graph. It’s also fun to stand back and watch your car all wound up.
:thumbsup:
This is the mechanical secondary Holley 650 HP I'm referring to... it's not an ultra HP just a regular HP... not sure what the difference is.
http://i1048.photobucket.com/albums/...ps6eeb15ae.jpg
A little off subject here... but do you recognize this bike?
http://i1048.photobucket.com/albums/...ps4cc08bce.jpg
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