New distributor problem, need help

Reply Subscribe

Thread Tools

Search this Thread

Apr 26, 2012 | 12:43 PM

antongonza

Thread Starter

Intermediate

Joined: Jun 2008

Posts: 25

Likes: 0

New distributor problem, need help

Bought a new mallory high performance distributor for my 78 L82 vette original 350 engine with mild cam ,and headers. Removed stock distributor and installed new one without any problems.Set timing to 12 degrees with vacuum advance disconnected. Test drove car and now car surges at cruise speed . Set adjustable vacuum can to minimum (closed) and car still surges at cruise speed.Disconnected / plugged vacuum hose and surging stopped engine became smooth again . I want to run car with vacuum advance hoooked up . Has any one had this problem or know what is problem? THANKS

Apr 26, 2012 | 12:48 PM

MelWff

Race Director

Joined: May 2006

Posts: 18,660

Likes: 2,562

You have too much vacuum advance at cruise. Does the adjustment change the amount of advance or the vacuum point at which you achieve full vacuum advance?

Apr 26, 2012 | 01:57 PM

oldalaskaman

Le Mans Master

Joined: Aug 2010

Posts: 9,272

Likes: 17

do you have the TBI?

Apr 26, 2012 | 02:13 PM

MelWff

Race Director

Joined: May 2006

Posts: 18,660

Likes: 2,562

78 has a carburetor

Apr 26, 2012 | 02:20 PM

oldalaskaman

Le Mans Master

Joined: Aug 2010

Posts: 9,272

Likes: 17

my bad, saw the l82 and brainfarted, could be slow egr?

Apr 26, 2012 | 04:12 PM

antongonza

Thread Starter

Intermediate

Joined: Jun 2008

Posts: 25

Likes: 0

Quote:

Originally Posted by MelWff

You have too much vacuum advance at cruise. Does the adjustment change the amount of advance or the vacuum point at which you achieve full vacuum advance?

Yes the adjustment on vacuum can does change the degrees advanced but at lowest adjustment setting which is around 19 degress advance I can't seem to get any lower. Maybe I need another vacuum can.

Apr 26, 2012 | 04:50 PM

MelWff

Race Director

Joined: May 2006

Posts: 18,660

Likes: 2,562

Yes you do, shouldnt have more than 10 or 12. The other thing you could do is braze the slot that the vacuum advance rod moves in to make it shorter.

Apr 26, 2012 | 10:19 PM

iokepakai

Burning Brakes

Joined: Apr 2007

Posts: 1,039

Likes: 62

From: Kona Hawaii

Had a similar problem when I installed a recurve kit.Had to set the limiter cam on the vacuum advance rod for less movement.Then reset the timing on the dizzy.Check this link...http://www.summitracing.com/parts/CRN-99619-1/ May need this part....[IMG]

[/IMG]