jdmontheway
New Member
i have a b18c1 block w/an ls crank rods and a block guard.. the head is going to be p&p valve springs/retainers , all that good stuff . would 13.5 supertech pistons im running race gas lsd you know what do you guys think
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Not necessarily. Remember, RIGHT CAMS.
Still, 13.5:1 compression is a waste of time when tuned on pump. He wont even get to take advantage of the power it can make on pump gas. He is going to have to use a mild lift/short duration camshaft, being its an ls crank. With that long rod stroke its gonna be hell spinning it higher than 8200rpm regardless of what build it is. Even with S2S1's, he would still have to retard the timing, I dont care if god tunes it himself.
Huh? Where are you getting your info from? You want a LONGER duration LONGER overlap cam setup for high static compression. That rod/stroke setup doesn't have ANY problem spinning WELL past 8200rpm too.
Did you fail to notice the part where he is using an LS crankshaft? Do your homework and you will understand that long rod stroke + your long duration camshaft = guaranteed bearing failure at high rpms. 13.5:1 compression is worthless when tuned on 93, bottom line. Been there, done that. 12:1 - 12.5:1 will be suitable for 93 octane pump gas. I dont care who builds that engine, it will fail at high rpm's, bottom line.
Well Cal, all I can say is that I'm coming from people who both their own flow bench and dyno. Even the flow bench manuals recommend against more than 12:1 on pump gas and rather recommend using compression based on what octane you're running. I trust your opinion with many things, but not with this.
Remember, your 13.5:1 engine burned up because of a bad tune. My 9.5:1 engine has ridiculously advanced timing.
lol...its like he doesnt understand what you do for a living cal....believe me...its a lot more technically complicated than making a ls spin above 8200rpms.
Well Cal, all I can say is that I'm coming from people who both their own flow bench and dyno. Even the flow bench manuals recommend against more than 12:1 on pump gas and rather recommend using compression based on what octane you're running. I trust your opinion with many things, but not with this.
Remember, your 13.5:1 engine burned up because of a bad tune. My 9.5:1 engine has ridiculously advanced timing.
Damn....he went there.