Animal PVL Timing

[Ldubois823]

I have read the post about pvl timing and so forth on how to, etc. etc.. I'm being told that if I run 34-36* ignition timing the rod bearings will not stay within the Arc Rod. How much truth is there to this? Is this only on High Compression motors with welded heads? The motor is a 100% WKA Limited Modified Animal as per rules. Compression of engine, unknown...

Thanks in Advance.'

[Jimbo]

I think you have a very generous amount of timing at 36*

[CarlsonMotorsports]

Way more timing than you need with a pvl. With the OS ignition, maybe you'd be alright.

If it's got the adjustable center hub flywheel, have Jimbo play with the timing while he's dyno-ing your engine.
Then you'll know you've got it right, without detonation.
Run it on a dyno with the knock sensor going off very long and you'll see first hand how 36* timing works for ya.


-----
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
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29 years of service to the karting industry
Linden, IN
765-339-4407
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[Ldubois823]

Thanks! I guess ill back it down a little before the weekend. Don't want to blow it up

I'd love to had the puppy off to you at PRI but we racing this Saturday Indoors @ Russellville, KY. I will be in touch Jimbo.

I think you have a very generous amount of timing at 36*

[Ldubois823]

So what happens? Melt piston? Rip the top ring off it? or knock the bearings out of the rod?

If it's got the adjustable center hub flywheel......you'll see first hand how 36* timing works for ya.

[flattop1]

30* is stock.
from the previous posts 36* is too much.
I broke a rod bearing roller pin in my boat by cranking in more than recommended ignition timing.
4 pistons and an overbore.

[CarlsonMotorsports]

Depending on how much you've cut from the top of the piston and how close the top ring land is...generally the ring land is not the problem. Wrist pin and boss of the piston are much more susceptible to damage with pre-ignition / knock.
Definitely flat spot the bearings and hard on rod bolts.

[Jimbo]

If you create random excessive pressure spikes in the combustion chamber one of the first things to go is the head gasket.
I have found that people often just put an offset key in the motor to advance the timing. Often times they never actually what timing they end up with.
I had one person that kept melting down pistons. He swore he had 33* degrees of timing but he actually had 40*
The best way to actually check the timing is with a piston stop and a large degree wheel.

[Ldubois823]

Okay. Question Jimbo, On small Arena track will on beable to tell the difference from 32-33d from the stock key installed?

If you create random excessive pressure spikes in the combustion chamber one of the first things to go is the head gasket.
I have found that people often just put an offset key in the motor to advance the timing. Often times they never actually what timing they end up with.
I had one person that kept melting down pistons. He swore he had 33* degrees of timing but he actually had 40*
The best way to actually check the timing is with a piston stop and a large degree wheel.

[Jimbo]

I doubt it.