Vacuum Reading for a street ported motor?
 

What should the Vacuum reading be for a streetported motor?? Mine Vac's at about 12, do you think i have a vac leak? ill check all the hoses, but they were all replaced recently. Get back to me, peace.

~12-~13 if ia am not mistaken. i get that reading, and my motor was just redone by pettit. there was a thread on this last year sometime, and do not know if a search would get you any info on it cause i tis so old....

I don't know this from experience, but from what I've read it really depends on the porting. Mild-normal streetport should be around 15.. A heavy port would be around 10-12...

Mine's ~15 and is a mild street port, so this look good based on my experience.

-E

I have 2500 miles on my streetport and read 19-20 consistently:D KD Rotary streetported my motor.

i have an aggressive streetport and i'm reading 13 or so at idle

19-20 vacuum on a Streetport?

Either the gauge is wrong or they didn't port it. That's the reading a non-ported engine should read.

I agree with Mahjik, sounds strange?

The gauge is right. My old motor with 72000 miles on it before the coolant seals went read 16-17 vacuum. When breaking in my motor I had 16-17 readings and KDR told me it would slowly climb as the engine wore in to around 18-19. At idle I've been reading between 18-20 but usually 19. I have a mild-port and uh, I think he did port it since my car pulls much harder up top:rolleyes:

when warm mine on my pms is 15.8 or so

Interesting since every website and just about all the information around says that porting causes lower vacuum readings. If a non-ported engine is 18-20, then a ported engine should be lower (like the other guys are reporting there's in this thread).

Just FYI, my car pulled better on a reman from when my seals were gone on the original... :rolleyes:

i have only 1100 miles on the new/ported motor that pettit did for me, and the vacuum readings right now are 12-14.......and should get 'slightly' higher

btw, the vacuum readings on a ported motor will be LOWER than those of a non ported motor.....

Kwikrx7, what kind of apex seals do you have in your engine? I ask because I thought I read a while back about people getting very good idle vacuum (even on a street port) with hurley seals. I tried a quick search to see if I could find where I read that, but I didn't have any luck.

I found it after searching further...read the 16th post down from the top...it's a post by gmonsen

https://www.rx7club.com/forum/showth...&threadid=8781

He says that he is seeing 20-22 inches on his streetported motor with Hurley racing seals.

I see ~19-20 on my streetport but I only have 25 miles on the engine.
http://www.nopro.com/~jedon/engine/
People have said the porting is pretty mild.
I can't attest to the power yet since I'm still breaking it in.
-Jedon

I lied earlier. After looking at mine at idle today, I'm looking at ~19 also. Mild street port from Pineapple.

-E