ignition timing/super charged
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ignition timing/super charged
I'm looking for a second opinion on ignition timing specs for a GM 350 engine with a Mercury Thunderbolt IV(v-6) ignition and a roots type supercharger.
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What boost, compression, heads, plugs, intercooled or not? Injected or carb?
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Here is the set-up:
GM 350 ,162 b&m blower(6-7 pounds of boost),holly 4150 750cfm carb,lunati cam for super charger(custom built for marine use), mercury thunderbolt IV ignition(6-12 degrees timing),standard plugs for mercruiser 260
GM 350 ,162 b&m blower(6-7 pounds of boost),holly 4150 750cfm carb,lunati cam for super charger(custom built for marine use), mercury thunderbolt IV ignition(6-12 degrees timing),standard plugs for mercruiser 260
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set your total timing at 34,blower motors like advance even at low rpm,i always use msd distributor and lock it out.
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In my opinion 34 is too much with a non intercooled little blower putting out 7 pounds of boost with no knock protection. If it where mine and I was not going to set it up on a dyno it would not have but 30 degrees total as it just not worth the chances.
Allen
Allen
#10
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I would set it at 30-32* total. Also I would change the spark plugs to 2 heat ranges cooler.