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Old 10-20-2019, 08:35 PM   #21
JSeery
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Default Re: advance curves

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Originally Posted by BUBBAS IGNITION View Post
Those charts are 32-41 helmets , the load a matic is a totaly different discussion. The load a matic have a ton of advance available , however with venturi its a total different spec ( and a different engine)/I will dig up some specs on those this week as i am presently working on a couple.....
Totally agree, but have never heard of a recommended timing anywhere near what the torque charts show. 12 degrees at 2000 rpm and all in around almost 3500 rpm?
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Old 10-21-2019, 06:19 AM   #22
BUBBAS IGNITION
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Default Re: advance curves

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Totally agree, but have never heard of a recommended timing anywhere near what the torque charts show. 12 degrees at 2000 rpm and all in around almost 3500 rpm?
Yes i agree they really dont make sense sometimes . If ya look at the one on the right it has a arrow and a * at 65 HP and 165 ft lbs thats where the torque and HP meet 2200 rpm.
Once torque drops the engine isnt really doing much work from that point on.
The spark advance is approx 12-15 degrees at that point.
It takes a pretty perfect engine set up to get the HP out of one of these on a rebuild... A driveway rebuild may be 60-70HP at best , same with ignition , takes some massaging to make them perfect .

I probably built a few hundred before i got a perfect one !!
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Old 10-21-2019, 06:55 AM   #23
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Default Re: advance curves

I don't mean to hijack the thread but I have somewhat related question: do I need to make any adjustments to timing when I use 89 octane gas?
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Old 10-21-2019, 03:49 PM   #24
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Default Re: advance curves

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I don't mean to hijack the thread but I have somewhat related question: do I need to make any adjustments to timing when I use 89 octane gas?
Theres very little adjustment to timing available , run it as is .....
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