Technical Question: Why LSX block can go to 4.2" bore while the LQ9 can not???
05-15-2010, 04:40 PM
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Technical Question: Why LSX block can go to 4.2" bore while the LQ9 can not??? I have this question which I didn't find the convensing answer:
Through reading about the LSX block, it has the ability to go all the way up to 4.2" bore and still able to with stand high power application, while the LQ9 block can maximum be bored up to 4.065". Why is this the case while both block have almost the same dimensions, cylinder to cylinder call thinkness is the same, thus why the LQ9 can not be bored to 4.2"?
The only answer I think is that the material of the LSX block is been constructed from a material having higher strength properties (yield & tensile strength) than the LQ9 block!!!
Please advice???
Through reading about the LSX block, it has the ability to go all the way up to 4.2" bore and still able to with stand high power application, while the LQ9 block can maximum be bored up to 4.065". Why is this the case while both block have almost the same dimensions, cylinder to cylinder call thinkness is the same, thus why the LQ9 can not be bored to 4.2"?
The only answer I think is that the material of the LSX block is been constructed from a material having higher strength properties (yield & tensile strength) than the LQ9 block!!!
Please advice???
Last edited by LS6; 05-15-2010 at 04:58 PM.
05-16-2010, 03:14 AM
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I think the max max is 4.080, iv always thought about the same thing. What is the real limiting factor. I know a sonic check is in order when going way over, mybe the lsx is a more true cast also. I do believe i read they are of stronger iron. I know the deck height is higher. I always figured it would be bore spacing limited. Havnt looked at one real close apart in a long time thou.
05-16-2010, 06:45 PM
#6
Probably the reason why the LQ9/LQ4 block can't go to 4.2" bore is due to water jackets. More than likely with a huge overbore, it would hit a water jacket and then you're SOL. The LSX has more material to machine away, but I'd always stay with having the cylinder walls with a thickness of 0.25" to be safe. For an LQ9 block, I'd go with a max overbore of 4.06" if you are running NA, 4.03" with nitrous/blower/turbo application for safety.
The LSX iron is much tougher than the LQ9 block, but it all depends on what you want to build with it.
The LSX iron is much tougher than the LQ9 block, but it all depends on what you want to build with it.
