I just got my car converted to a big single and got some big ports done. I was looking at my manifold vacume and its basically 10-12InHg at 1000rpm, is this normal?

Thankx

 

yes , mines 9-10 mm Hg.

 

yup, i'm around 10-11 also.

 

Its the same with me... and sometimes my car starts surging idle after boosting?

 

17-18@1k. Do you guys have bridgeports or something? I thought maybe 10in was quite low.

 

Ok here it goes... i bought a streetported motor from japan and blew it in 1500kms...

Now when i was rebuilding a motor i had to use one of my old side housing... now i have two ported and one stock ported housing

And my idle vaccum is low but the pressure out of the exhaust is extremely high... the car runs great otherwise...

i have never adjusted my idle screw or the dashpot... Can that be causing it?

thanks

 

So you are using ported end plates with a stock intermediate plate?

 

That was me that posted the last message. The forum has been logging me in as different people lately.

 

8"-10" vaccuum. 750-1000rpm idle. I'm guessing the ports are pretty big.

 

8"-10" vaccuum. 750-1000rpm idle. I'm guessing the ports are pretty big.

 

Exactly the same.