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6/71 at 18 degrees?

2K views 4 replies 5 participants last post by  Mr.Chev 
#1 ·
According to performance trends engine analyzer the best performance timing for my drag engine is 18 degrees which I believe would put the timing burn on the strap well into the threads of the plug. Would this be a concern? It's a drag only car.

Dart 434
Bore: 4.155
Stroke: 4.00
Compression: 8.6
Comp Cams roller cam
Intake lift .637
Exhaust lift .631
Duration @ .020 intake 300 exhaust .302
Valve timing @.050 intake open 21 BTDC close 63 ABDC
Exhaust open 71 BBDC close 13 ATDC
Installed @ 111.0 center line
Duration @ .050 intake 264 exhaust 264
Lobe lift intake .4210 exhaust .4210
Lobe separation 115.0
Brodix track 1 cnc 227cc heads with manley valves and springs
Weiand 6/71 blower .12 over drive
Twin Holley 1000 CFM HP carbs blocked power valves #94 jets all around
NGK 4554 R5671A-8 plugs
 
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#2 · (Edited)
Start at the best timing for your engine as if it were N/A, remove 1.0 deg of timing for every pound of boost.
18 deg seems low unless you're making 20+psi.
 
#3 ·
I am from the old school (on a drag race only app) where timing is determined by plugs and performance. While the program might be great to provide a theoretical ideal timing point which could be used to determine a safe starting point, in my opinion with something as easy to change as timing real world testing is the way to go.
 
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