ls3 piston compression ratio help.
Thread Starter
Intermediate
Joined: May 2017
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ls3 piston compression ratio help.
Hi I am building up a ls3 engine and need help on piston selection since I plan on running boost. I am looking for 700whp. The pistons I am looking at is mahle 930224570 which will give me a 10.1:1 and je 312031 which will give me 9.4:1, Which compressio ratio should I go with? Also my heads were given to me from my buddy who owed me some cash, the heads are cnc ported and milled to 64cc chambers hence the reason for piston selection. Btw will I have any problems with head deack thickness since they are milled such as head floating etc? I do have arp head studs to give them some extra clamping force. Also I will be running pump 92 octane with meth injection.
Thanks
Richard
Thanks
Richard
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Would be fine for the 700 you're going for. Plenty of stock weaker pistons with higher CR's have done it so don't see any reason to lower it much IMO. Just use plenty of meth to keep octane up
If it were e85 setup I'd go like 12 or 13:1
But others may disagree
If it were e85 setup I'd go like 12 or 13:1
But others may disagree
Melting Slicks
Joined: Feb 2013
Posts: 2,034
Likes: 111
I've had both 9.5:1 on my old setup at 760whp and newest setup is 9.75:1 at 900whp and I would go with higher compression. I'd say 10:1 is probably the bare minimum I'd go with going forward and if doing again would do 10.5:1 or something probably
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Thread Starter
Intermediate
Joined: May 2017
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Richard
Team Owner
Joined: Nov 2007
Posts: 24,035
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From: Gilbert AZ
Thats like saying you are going to run a LS3 based motor. Way too broad.
Friends here are one of the largest BW dealers around. They stock hundreds of them. A s475 can be 1000 different combinations, and without your complete combo/goals, only answer to S475 is maybe it will be good.
Friends here are one of the largest BW dealers around. They stock hundreds of them. A s475 can be 1000 different combinations, and without your complete combo/goals, only answer to S475 is maybe it will be good.
Thread Starter
Intermediate
Joined: May 2017
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Sorry this is the one I was looking at it is t6 and has a 96mm rear wheel. I want a faster spool btw.
http://www.ebay.com/itm/Borg-Warner-...9W3xCd&vxp=mtr
http://www.ebay.com/itm/Borg-Warner-...9W3xCd&vxp=mtr
Melting Slicks
Joined: Oct 2007
Posts: 2,569
Likes: 170
It depends on the blower and fuel to a certain extent but 10.0-10.5:1 is a pretty good area to be in around 700whp on pump gas.
As long as you have the fueling for it the more the better. My current motor is at 10.5:1 and I wish I had gone a bit higher.
As long as you have the fueling for it the more the better. My current motor is at 10.5:1 and I wish I had gone a bit higher.
Thread Starter
Intermediate
Joined: May 2017
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