04-29-2004, 03:05 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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It looks like the new 11:1 427 likes the silver (lightest) springs in the MSD Billet Distributor. It also seems to like the smallest (red) mechanical stop which stops the distributor with 24 degrees of mechanical advance which makes the curve look like this:
1000 rpm 0 degrees (12 degrees BTC static)
1500 rpm 12 degrees (24 BTC total)
1800 rpm 18 degrees (30 BTC total)
2300 rpm 24 degrees (36 BTC total)
The 428 I took out which was a mild 9.5:1 was happiest at 10 degrees static and about 34 degrees total advance on 91 octane 76 "premium". I should note I have resorted to a 10% blend of 114 octane to give the 427 an overall octane fuel of 93.5 which may explain why it likes the faster curve.
I'm still a little perplexed at the 44 degree advance mentioned earlier in this thread. Anyone else had success that far out? Generally speaking, the shorter or more efficient the path the fewer the degrees an engine wants. Aluminum heads and flat top pistons are the most efficient while low rise and CJ heads take more especially if domed pistons are used.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
Last edited by SCOBRAC; 04-29-2004 at 03:10 PM..
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