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What to set timing at #2920991
05/10/21 10:48 PM
05/10/21 10:48 PM
Joined: Jan 2006
Posts: 216
ohio
D
dragon Offline OP
enthusiast
dragon  Offline OP
enthusiast
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Joined: Jan 2006
Posts: 216
ohio
What would you start with the timing set at and what would the max you would go to on a 540. 13: 1 compression. Aluminum heads on Methanol. Thanks

Re: What to set timing at [Re: dragon] #2921013
05/11/21 12:34 AM
05/11/21 12:34 AM
Joined: Jan 2003
Posts: 29,974
Oregon
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AndyF Offline
Too Many Posts
AndyF  Offline
Too Many Posts
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Joined: Jan 2003
Posts: 29,974
Oregon
You should probably ask the engine builder that question since it depends on the cylinder head and and combustion chamber design. Wedge engines usually like something in the 34 to 36 range but it can vary a lot depending on what parts the engine builder used.

Re: What to set timing at [Re: dragon] #2921927
05/12/21 11:03 PM
05/12/21 11:03 PM
Joined: Feb 2009
Posts: 345
Arkansas
JoWeTu_6 Offline
enthusiast
JoWeTu_6  Offline
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Joined: Feb 2009
Posts: 345
Arkansas
My total is 34 with Indy 572-13 heads twocents
But it does depend alot on your particulars.

I'm just saying.

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Re: What to set timing at [Re: dragon] #2921954
05/13/21 12:37 AM
05/13/21 12:37 AM
Joined: Nov 2015
Posts: 668
Missouri
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jwb123 Offline
mopar
jwb123  Offline
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Joined: Nov 2015
Posts: 668
Missouri
Ignition timing is affected by a lot of factors. As mentioned chamber design, intake valve opening, quench clearance, but one that most do not mention is rod stoke ratio. The rod stroke ratio controls the amount of time the piston dwells at TDC, before starting down the cylinder, You want to fire the mixture just before the piston starts down the cylinder for maximum torque. The other factors mentions basically control the speed of the burn. The speed of the expanding flame front driving the piston down is the next biggest factor.
A dyno or drag race time slips and reading the strap on the plug, is how to get it perfect. A good engine program will get you close. I use Performance Trends software, it will calculate an advance curve, as well as max timing. I find it to be with in a couple degrees on most engines.







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