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  #31 (permalink)  
Old 02-10-2011, 03:50 PM
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Quote:
Originally Posted by ericnova72
IC-988 is a bit lighter(70 grams, 844 grams w/pin) and has 38cc dome. Would make balancing a bit easier and gaurantee it wouldn't need any mallory in the crank.
I can't even find that piston on KB/Icons website!

... found it now, that actually looks like the perfect piston for this setup then. (CR comes out to 10.4 at +.30)

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  #32 (permalink)  
Old 02-10-2011, 04:14 PM
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Originally Posted by cobalt327
I cannot even say w/certainty that the 909g piston would need heavy metal- BUT- the lighter piston sure could help things in that regard.

The lighter slugs also would be more "rev-able", to boot. Less load on the crank and bearings.

But this will drop the CR down to 10.7:1, so be sure the cam is compatible w/that CR.
How are you getting that CR? I'm just using Icons website that uses .30, asking for cylinder head volume, which using a 781 head with bigger valves should open it up just a tid but more to something like 122ish? which is giving me 10.4:1 with those 988's. As I'm shooting for +/- .25 of 10.5:1, either way I think those'll be right on the money. Now I just have to find someone that stocks those, that aren't at retail price!
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  #33 (permalink)  
Old 02-10-2011, 09:16 PM
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Quote:
Originally Posted by Wattsy
How are you getting that CR? I'm just using Icons website that uses .30, asking for cylinder head volume, which using a 781 head with bigger valves should open it up just a tid but more to something like 122ish? which is giving me 10.4:1 with those 988's. As I'm shooting for +/- .25 of 10.5:1, either way I think those'll be right on the money. Now I just have to find someone that stocks those, that aren't at retail price!


Except for the piston dome volume, this are the same values I've used throughout this thread. The zero deck w/0.041 compressed thickness head gasket can be any combination of gasket thickness and piston deck clearance that equals 0.041".
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Old 02-10-2011, 09:19 PM
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I see how you got that now, I was using a different compression ratio than you were, 122cc's (roughly what the head is going to be, putting me right on the money. Thanks though!
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Old 02-10-2011, 09:23 PM
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Quote:
Originally Posted by Wattsy
...I was using a different compression ratio than you were, 122cc's...
Actually, that would be a different combustion chamber volume. The calculator I used is HERE.

Good luck.
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  #36 (permalink)  
Old 02-10-2011, 09:46 PM
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you know what I meant!!

thanks
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