LY5 5.3L suitable for boost?
Thread Starter
Teching In
Joined: Feb 2008
Posts: 15
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From: Portsmouth, England (but an Aussie)
LY5 5.3L suitable for boost? Hi People,
I'm in the UK where cheap LS motors are pretty rare but I've come across a 2007 LY5 5.3L that I'd like to do a cheap turbo motor for a sleeper project.
Plans would be to pretty much copy Parish's Fairmont build for a gen 1 RX7. So basically a budget turbo etc with a glide for some cheapish fun. No daily driver stuff but a street car and decent fuel and meth wouldn't be a problem.
From what I can see these motors have 9.9:1 compression ratio that isn't great but whats the general opinion on these for a boosted donor motor?
A mate in LA works for Isuzu and can get L92 heads cheap, do they have a bigger chamber that would help lower the compression for boost?
Thanks in advance
Steve
I'm in the UK where cheap LS motors are pretty rare but I've come across a 2007 LY5 5.3L that I'd like to do a cheap turbo motor for a sleeper project.
Plans would be to pretty much copy Parish's Fairmont build for a gen 1 RX7. So basically a budget turbo etc with a glide for some cheapish fun. No daily driver stuff but a street car and decent fuel and meth wouldn't be a problem.
From what I can see these motors have 9.9:1 compression ratio that isn't great but whats the general opinion on these for a boosted donor motor?
A mate in LA works for Isuzu and can get L92 heads cheap, do they have a bigger chamber that would help lower the compression for boost?
Thanks in advance
Steve
Thread Starter
Teching In
Joined: Feb 2008
Posts: 15
Likes: 0
From: Portsmouth, England (but an Aussie)
The only thing I've been able to find was on a truck forum which said castings 799 or 243 with 64.5 cc chambers.
Just found this which backs up your comment on the bore size, cheers for that - http://www.crateenginedepot.com/stor...ty-W63C10.aspx
Been looking on Performance trucks and the 317's would drop the compression a point so would do the trick.
What's peoples views on boosting on top of 9.9:1 compression?
Would ultimately like to been in the 500 - 550 range.
Thanks
Steve
Just found this which backs up your comment on the bore size, cheers for that - http://www.crateenginedepot.com/stor...ty-W63C10.aspx
Been looking on Performance trucks and the 317's would drop the compression a point so would do the trick.
What's peoples views on boosting on top of 9.9:1 compression?
Would ultimately like to been in the 500 - 550 range.
Thanks
Steve
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Im running a 7875 .96 @ 17psi on a LY5 right now, the stock heads are 243 which makes compression 9.9... i swapped my stock 241s on because it has a bigger combustion chamber, im guessing its in the 9.25:1 area now.... i wouldnt do 317s because mine is pretty sluggish out of boost as it is, if i could do it over i would have used a bigger cam or even stayed with 243 heads, higher compression and boost is becoming more common with proper tuning...9.9 isnt even very high anyways
