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Author Topic:   welding HEI, timing retards @ high RPM
Dirt Full Roller

Total posts: 39
posted April 13, 2004 08:34 AM  
I have a friend that just welded his Distributor, and when you bring the RPM up it seems to retard about 4 degrees. Does he have to time it at higher RPM? Then it would be at like 37 degrees at idle and 32 at higher RPM. Also why does it do this?
Thank You Ed Anschutz

Dirt Full Roller

Total posts: 70
posted April 13, 2004 09:38 AM  
stock ignition modules are bad for that. I had that last year and tried a few different stock modules and and accel module and they all did it to an extent. I switched to an MSD module (MSD 8364) and it went away completely. The timing didn't even vary a degree after that.

Dirt Freak

Total posts: 370
posted April 13, 2004 10:11 AM  
Definately the module doing that. The MSD module works. Throw that other junk out in the brush. You have to have a darn good distributor to perform properly above 7 thou.!!

Dirt Forum Racer

Total posts: 90
posted April 13, 2004 11:11 AM  


Dirt Freak

Total posts: 268
posted April 13, 2004 09:05 PM  
I just locked my vacume advance withe a lock kit and in order to get 36 degress total advance I had to set the timing at 1100 rpm at 22 degress. Is this normal. I messed around with diferent springs and had the timing move around a little at high rpms like 5000 to 5500 rpm. I was best with 2 medium springs and I realise that the spring change the advance rpm range but the lighter quicker springs seam to make the timing jump around a little. I am running a stock GM distributor with new gear on the bottom and a new pick up and its running threw a MSD 6A module and blaster coil. Weights are new as well as bushing and springs. Any thoughts?

Dirt Maniac

Total posts: 192
posted April 14, 2004 01:05 PM  
With the right module, a welded distrubutor and an advance distributor act the same at race conditions. With an advance kit, you need to time the motor after the advance has moved to the full advanced state ussually around 2000 to 2200 rpms. Then time the motor. The only advantage to a advance kit is its easier to start and wont load up at idle, once you get the motor above 2500, the advance kit should be fully advanced and the same as a welded one then. Very rarely does someone run beneath 2500 when racing except on yellows. Hope this helps.


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