Another 370 question
Another 370 question So I have following for my 370 build
Weisco K398X3 pistons (-3.2cc)
Manley 6.125 rods with arp 2000 bolts
Stock LS2 crank
LY6 block (don't have it yet need to get it)
317 heads
Edelbrock eforce
LS9 gaskets
LEP stage 1 blower cam
ARP main and head studs
With the above set up I have came up with 10:1 cr . I call the machin shop near me an ask for a quote from the to machine the block an assemble the short block. They said that 10:1 cr is a little hi for 6-8lb of boost. I plan on a smaller pulley on the blower an OD ATI damper thay wil put me at around 8-10lb of boost. So my question is should I have gone with a different piston or is 10:1 fine. I read a few 370 post on here an I seen 10:1 t9 being good.
Need some input please.
*** guy at machin shop said the run Mopar motors an 8: and with the 8:1cr your tuning margin is alot bigger then a 10:1 cr motor***
Weisco K398X3 pistons (-3.2cc)
Manley 6.125 rods with arp 2000 bolts
Stock LS2 crank
LY6 block (don't have it yet need to get it)
317 heads
Edelbrock eforce
LS9 gaskets
LEP stage 1 blower cam
ARP main and head studs
With the above set up I have came up with 10:1 cr . I call the machin shop near me an ask for a quote from the to machine the block an assemble the short block. They said that 10:1 cr is a little hi for 6-8lb of boost. I plan on a smaller pulley on the blower an OD ATI damper thay wil put me at around 8-10lb of boost. So my question is should I have gone with a different piston or is 10:1 fine. I read a few 370 post on here an I seen 10:1 t9 being good.
Need some input please.
*** guy at machin shop said the run Mopar motors an 8: and with the 8:1cr your tuning margin is alot bigger then a 10:1 cr motor***
Last edited by lilaaron233333; Aug 25, 2015 at 06:48 PM.
Seems like this machine shop is stuck in the 80s, do they do work on LSx engines or mainly SBCs?
10:1 CR is perfectly fine for 8-10lbs, heck stock engines pushing mid to high 10s CR can run those types of boost levels and tuning is not an issue. And that's on stock pistons and rods.
8:1 CR is way to low and unecessary in today's tuning world. If you were planning 30lbs I would say ok go that low. For a measily 10lbs no need.
10:1 CR is perfectly fine for 8-10lbs, heck stock engines pushing mid to high 10s CR can run those types of boost levels and tuning is not an issue. And that's on stock pistons and rods.
8:1 CR is way to low and unecessary in today's tuning world. If you were planning 30lbs I would say ok go that low. For a measily 10lbs no need.
Thats what's I figured. there shop doesn't deal with many ls motors. Might jist stay aqay frm them. An forgot to memention I'll be running water meth to. He also said running 6-8lb of boost and a 10:1 motor it will end up being 13:1 :/ ???.what is he talkin bout 13:!?!?!?!?
He seems to be calculating the cylinder pressure of the boost+compression.
If you've got meth injection also then even more so you should be more than safe at those levels. Heck, you can probably push upwards of 17-20 on that setup and be ok.
If you've got meth injection also then even more so you should be more than safe at those levels. Heck, you can probably push upwards of 17-20 on that setup and be ok.
So I have following for my 370 build
Weisco K398X3 pistons (-2cc)
Manley 6.125 rods with arp 2000 bolts
Stock LS2 crank
LY6 block (don't have it yet need to get it)
317 heads
Edelbrock eforce
LS9 gaskets
LEP stage 1 blower cam
ARP main and head studs
With the above set up I have came up with 10:1 cr . I call the machin shop near me an ask for a quote from the to machine the block an assemble the short block. They said that 10:1 cr is a little hi for 6-8lb of boost. I plan on a smaller pulley on the blower an OD ATI damper thay wil put me at around 8-10lb of boost. So my question is should I have gone with a different piston or is 10:1 fine. I read a few 370 post on here an I seen 10:1 t9 being good.
Need some input please.
*** guy at machin shop said the run Mopar motors an 8: and with the 8:1cr your tuning margin is alot bigger then a 10:1 cr motor***
Weisco K398X3 pistons (-2cc)
Manley 6.125 rods with arp 2000 bolts
Stock LS2 crank
LY6 block (don't have it yet need to get it)
317 heads
Edelbrock eforce
LS9 gaskets
LEP stage 1 blower cam
ARP main and head studs
With the above set up I have came up with 10:1 cr . I call the machin shop near me an ask for a quote from the to machine the block an assemble the short block. They said that 10:1 cr is a little hi for 6-8lb of boost. I plan on a smaller pulley on the blower an OD ATI damper thay wil put me at around 8-10lb of boost. So my question is should I have gone with a different piston or is 10:1 fine. I read a few 370 post on here an I seen 10:1 t9 being good.
Need some input please.
*** guy at machin shop said the run Mopar motors an 8: and with the 8:1cr your tuning margin is alot bigger then a 10:1 cr motor***
Second, he is right about how a lower CR has a wider tuning window, but 8:1 is a bit extreme. The LSA and LS9 factory supercharged engines are both 9.1:1, which would be safer with 10lbs of boost than 10:1.
If you decide to lower the compression ratio, swapping the pistons to an 11cc dish will bring you down to 9.1:1.
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CR also depends on what type of boost you have, and for example your choice of a PD supercharger will nullify some of the downfalls of going with too low of a compression. So you shouldn't feel much of a difference if you go with 9 vs 10 compression, unlike others with say centri superchargers or big turbos.
Here's another question. If in run a lq9 block what has to be done to run it on a 08 tbss. I know side knock sensores need to be drilled an tapped but I have read there's not a chunk of metal on the pass. side to drill and tap so where would that sensor and second will a Gen IV valley cover fit on a lq9? The oil pressure sensor isn't in the cover anymore it's been relocated to the side of the oil pan where the bypass is .