Compression question (317's on 5.7)
Compression question (317's on 5.7) Came up with this compression # with this calculator. I used .051 gasket (-) the ~.007 the piston comes out of the hole for a total of .044 in the last field. Is 9.9 correct?
^^Like bww said, it is not factoring in gasket bore and such, but 9.9-10.0:1 is about right anyway, and good enough in most cases!
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Stock compression on an ls1 is 10:1, jumping up almost 5cc's in chamber size will probably drop it to around 9.5.
Also, considering the 10:1 stock compression of the lq9, being the only difference between these two instances is the larger bore, 9.5:1 on a stock ls1 with stock 317's is more believable than 10:1
Also, considering the 10:1 stock compression of the lq9, being the only difference between these two instances is the larger bore, 9.5:1 on a stock ls1 with stock 317's is more believable than 10:1
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He's not calculating using a stock thickness gasket though 
I ran it through my calculator to verify the numbers, using several different bore size gaskets too, which makes very small changes only.
I ran it through my calculator to verify the numbers, using several different bore size gaskets too, which makes very small changes only.
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
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I just used this one and got 9.78
-LS9 gaskets (4.100 bore, .051 compressed)
-.007 out
That'll work for me. I think I'll have them take .005 off when resurfacing, should be good to go. I just wanted to make sure I wasn't doing something incorrect. Thanks guys.
I just used this one and got 9.78
-LS9 gaskets (4.100 bore, .051 compressed)
-.007 out
That'll work for me. I think I'll have them take .005 off when resurfacing, should be good to go. I just wanted to make sure I wasn't doing something incorrect. Thanks guys.
Why would want the lower compression? The int/exh ports and valves are the same...you can get a set of ls1 for $100, if you are getting or have a cam it will prefer the higher compression
Because I'm throwing 12-13lbs of boost on a stock bottom end... And yes I'll have a CCP grind cam (222/230 115). It should be a tick above 9.8:1 after being resurfaced.
I went from the setup in sig to FI. My old LMS 243's were 59cc...
I went from the setup in sig to FI. My old LMS 243's were 59cc...
was wondering. ive been reading around and it seems that .040" gasket size is the one alot people recommend to get to get "optimum" quinch in the camber.
now with that added math,
that puts my stock LS1 at 9.9-10:1 CR (9.7:1 with LS9 gaskets) with 317 heads. with boost in mind, is 10psi "safe" to get HP up to 600ish?
just wondering about which gasket size to go with the 317 heads on my build and which would be better suited for 10psi and under. all things being equal of course. on a side note, im considering the Tu1 or 228r cam for it as well.
now with that added math,
that puts my stock LS1 at 9.9-10:1 CR (9.7:1 with LS9 gaskets) with 317 heads. with boost in mind, is 10psi "safe" to get HP up to 600ish?
just wondering about which gasket size to go with the 317 heads on my build and which would be better suited for 10psi and under. all things being equal of course. on a side note, im considering the Tu1 or 228r cam for it as well.
