Vacuum at idle

[GBGN1]

Still trying to chase down my engine wo's. ruff idle on new build . When cold and the TT chip has the blm locked it idles ok but closed loop idle is unstable . Checked compressin and all at 150-155. So that looks ok. Now I'm looking at checking vacuum . With my 218/212 comp roller with 1.65 rockers, what kind of vacuum would be optimal ? Could I get 15-16 out of it with big cam?


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[87_we4]

I only get about 13" at idle with my cam

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[earlbrown]

What's the LSA on that cam? Those rockers don't help with the vacuum either.

 

[GBGN1]

112


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[Buick Mark]

With my 210/210 roller I get around 11-12 in. hg. at idle in gear.

 

[Eric Stage I]

What is the BLM at idle, and are you using the Extreme G chip?
You might need to use open loop idle, and richen it up a little.

 

[GBGN1]

Thanks Eric , I actually just last night Found that the machined intake is not sealing correctly and letting air in the ports I could actually spray carb spray down pushrods holes and engine idle would get better so in the process of fixing that. I installed ta .016 gaskets now going to use 1200's and machine intake again.One thing after another on this car....


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