Experts Inside
11-16-2006, 12:11 PM
#1
Cam Experts Inside Here we go, 243/247 .653/.656 109+1(lsk lobes) with TFS 215 heads milled to 58cc's and a .040 head gasket. That would put my SCR at 11.58 and my DCR at 8.96. I did not figure in flycutting, how much will that effect my SCR and DCR? Do you think 8.96 is too high of a DCR for 93? This is a Max effort N/A stock bottom end 346 with the exception of doing rod bolts. Any input would be appreciated.
Last edited by The1N_only; 11-18-2006 at 06:17 PM.
11-17-2006, 02:11 PM
#5
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i think for each cc is around a tenth +/- of a point in compression so that will lower you down some .lets say you will wind up with 2cc relief total so that will drop you down around 2 tenths of a point and i can't remember how much dcr that will lower you but i think you will be o.k on 93.that should be a very strong combo and those heads will still have pretty good velocity so you may be on the high side but you can always take out a couple *if you have some knock.
11-17-2006, 02:14 PM
#6
Originally Posted by KCFormula
Not enough to worry about. If you really care you can CC your flycuts using a syringe and add that in, but its really not going to be enough to worry about.
11-17-2006, 02:18 PM
#7
Originally Posted by slow trap
i think for each cc is around a tenth +/- of a point in compression so that will lower you down some .lets say you will wind up with 2cc relief total so that will drop you down around 2 tenths of a point and i can't remember how much dcr that will lower you but i think you will be o.k on 93.that should be a very strong combo and those heads will still have pretty good velocity so you may be on the high side but you can always take out a couple *if you have some knock.
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11-17-2006, 04:11 PM
#8
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I would say you are pushing the limits of 93. If you have a source of good 93 you might be alright. Most say 8.6 or 8.7 is the limit for 91 so I imagine 93 can't be too far behind but I think you might be alright. You can always just add in a couple gallons of 101 if you have to.
11-18-2006, 04:52 PM
#11
I'd think that's on the ragged edge.. in summer heat.. I dunno. If you had a forged motor with good pistons, I'd say try it, but with stock pistons, it doesn't take much detonation to cook the ring lands off one.
I'd try not milling the heads that much, or go with a thicker head gasket at a minimum.... or just do a 100 unleaded/93 mix and go ahead as you've planned.
I'd try not milling the heads that much, or go with a thicker head gasket at a minimum.... or just do a 100 unleaded/93 mix and go ahead as you've planned.
