HEI Help please
Dr. Detroit
Joined: Mar 2012
Posts: 10,095
Likes: 4,022
From: New Braunfels Texas
Thanks Jebby
I finally got it running well without vacuum advance.
Idle 730 RPM advance was 18
3000 RPM was 36 degrees
Then I connected vacuum advance from the low port on the carb
I believe it is below the throttle plate and still considered manifold vacuum
I was initially at 20 IDLE
and 56 degrees at 3200 RPM
Dialed it down to 12 at IDLE
Still at 51 at 3200 RPM
Will this much advance hurt my engine?
I cannot hear pinging no dieseling etc.
93 octane gas.
Seems to run fine
What am I doing wrong?
Thanks
I finally got it running well without vacuum advance.
Idle 730 RPM advance was 18
3000 RPM was 36 degrees
Then I connected vacuum advance from the low port on the carb
I believe it is below the throttle plate and still considered manifold vacuum
I was initially at 20 IDLE
and 56 degrees at 3200 RPM
Dialed it down to 12 at IDLE
Still at 51 at 3200 RPM
Will this much advance hurt my engine?
I cannot hear pinging no dieseling etc.
93 octane gas.
Seems to run fine
What am I doing wrong?
Thanks
You will not be able to get an accurate reading with the can plugged in at 3000 rpm because it is not simulating light throttle/light load condition.......
Have Lars send you his timing papers and i am sure after reading it you will understand it much better.
18 degrees at idle is not unheard of for stock HEI distributor......it should be fine.
Jebby
Last edited by Jebbysan; Aug 2, 2019 at 03:33 PM.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 110
Likes: 3
Nothing, but you did move the timing again....so start over with the vac can unplugged to get your 36 total and then just plug the vac hose back on........and you are done.
You will not be able to get an accurate reading with the can plugged in at 3000 rpm because it is not simulating light throttle/light load condition.......
Have Lars send you his timing papers and i am sure after reading it you will understand it much better.
18 degrees at idle is not unheard of for stock HEI distributor......it should be fine.
Jebby
You will not be able to get an accurate reading with the can plugged in at 3000 rpm because it is not simulating light throttle/light load condition.......
Have Lars send you his timing papers and i am sure after reading it you will understand it much better.
18 degrees at idle is not unheard of for stock HEI distributor......it should be fine.
Jebby
Thanks Jebby
I started over 18 at Idle 36 at 3000 all in
Then I connected the vacuum and she runs well.
No pinging or missing.
She is a little slower off the line but smoother at idle and accelerating.
I'm going to run her this way for a few days to see how she does
Thanks for all the help!
MIke
Race Director
Joined: Mar 2017
Posts: 11,906
Likes: 4,479
From: Virginia
Sounds like you got it just right in the end. 36 degrees total with vacuum Disconnected and Plugged, at 3000 rpm (making sure this is all in). If you need to play with the vacuum advance, that is separate from the idle or all-in mechanical adjustment. You can swap vacuum cans, or add an adjustable can. Having some vacuum advance at idle (which you saw) is normal, and totally okay.
Now go drive your car!
Now go drive your car!
