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| SCR vs. DCR https://slantsix.org/forum/viewtopic.php?t=45431 |
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| Author: | 805moparkid [ Sun Jun 26, 2011 6:20 pm ] |
| Post subject: | SCR vs. DCR |
ok so this is a new variable that i have come across... i know that a big cam bleeds off compression and what not so i started looking... and well im not sure i like what i found... here are the specs on my motor (street/strip 91 octane) 3.480 bore 4.120 stroke 6.700 rod .157 in the hole 3.510 bore head gasket .020 compresses 44cc chambers cam's IVC is 67 (adv) and 51 ( @ .050) cam is .475 valve lift 246 @ .050 106LSA installed @ 102 now the program i use to figure compression and what not says i have 9.96:1 SCR... good... i just went onto wallace and it said its 235.12ci and a 8.95 compression! based on this my DCR is like 7.6! now i need to be a little closer to 8.5 to 9 DCR... am i just missing a step or what? thanks guys... |
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| Author: | DusterIdiot [ Sun Jun 26, 2011 7:46 pm ] |
| Post subject: | Nope that's right... |
Double checked your numbers, they're right...If I were picking a cam with a 246 dur @ .050 I'd be shooting for the 10-11:SCR range and hoping for something in the 8.6:DCR range... I usually deck the block pretty well, then fine tune the CR by shaving the head after I have checked the piston to deck height...Sounds like you need to deck the head a bit more to make it all jake... Good Luck, -D.idiot |
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| Author: | 805moparkid [ Sun Jun 26, 2011 11:04 pm ] |
| Post subject: | Re: Nope that's right... |
Quote: Double checked your numbers, they're right...If I were picking a cam with a 246 dur @ .050 I'd be shooting for the 10-11:SCR range and hoping for something in the 8.6:DCR range...
yea the head has .110 off and the block is .030 off (.157 in the hole) this was my first motor build so i would next tike start with the block and then the head...
I usually deck the block pretty well, then fine tune the CR by shaving the head after I have checked the piston to deck height...Sounds like you need to deck the head a bit more to make it all jake... Good Luck, -D.idiot |
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