Ignition Advance?
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Ignition Advance?
I am going to install an ingnition advance kit and need advice.
My current advance curve is 24 degrees advance fully in by 3500rpm. I am set at 35 total degree total advance so my initial advance is 11 degrees.
I have heard that for marine applications you want your advance to come in sooner. Why I don't know. So I went and purchased and spring set.
Here are my questions:
1) Should I reduce my advance from 24 degrees to 22 so I can have slightly more advance at idle (13 degrees)? Are there any positve or negative effects?
2) At what RPM do I want my total advance in? Do I want it in by 2500 rpm so I have full power when getting up on plane? Again what are the positives and negatives to setting the advance curve?
3) What are the advantages to setting a quicker advance curve?
Thanks
My current advance curve is 24 degrees advance fully in by 3500rpm. I am set at 35 total degree total advance so my initial advance is 11 degrees.
I have heard that for marine applications you want your advance to come in sooner. Why I don't know. So I went and purchased and spring set.
Here are my questions:
1) Should I reduce my advance from 24 degrees to 22 so I can have slightly more advance at idle (13 degrees)? Are there any positve or negative effects?
2) At what RPM do I want my total advance in? Do I want it in by 2500 rpm so I have full power when getting up on plane? Again what are the positives and negatives to setting the advance curve?
3) What are the advantages to setting a quicker advance curve?
Thanks
#2
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Re: Ignition Advance?
I do about 100 distributor per year so maybe I can help ya out here. Higher base timing will increase your idle, smooth it out a little if you have a big cam, increase your manifold vacum BUT possibly make it harder to crank when hot. 10 to 12 base is a good average but not as important as total.
You want the advance to be zero up to around 1000rpm and start climbing from there so its all in by 3000 rpm tops for maximum cruising efficiency. Your engine probably spends very little time under 3000. 35 total is pushing things unless you run premium fuel with not too much compression. Most engine builders I do distributors for spec 22 to 24 max advance over a 10* base.
You want the advance to be zero up to around 1000rpm and start climbing from there so its all in by 3000 rpm tops for maximum cruising efficiency. Your engine probably spends very little time under 3000. 35 total is pushing things unless you run premium fuel with not too much compression. Most engine builders I do distributors for spec 22 to 24 max advance over a 10* base.