Questions on compression and boost.
Questions on compression and boost. So I managed to pick up a ls1 shortblock and 706 heads. From what I read that would put me in at around 10:7 to 1. I plan on running a torqstorm supercharger at 10 psi. I was going to run e85 but the closes station to me is about 20 min one way so that's out of the question. With that in mind what's a safe compression @ 10 psi and pump gas? I didnt want to run meth if I could avoid it but I'd also like something that will last a while so I would appreciate some schooling from those of you who know some things.
I would consider selling your 706 heads and picking up some 317 heads. The larger chambers should drop your CR by about a point, that will be beneficial if running pump gas.
FormerVendor
Joined: Aug 2017
Posts: 186
Likes: 1
From: Wyoming, Mi
So I managed to pick up a ls1 shortblock and 706 heads. From what I read that would put me in at around 10:7 to 1. I plan on running a torqstorm supercharger at 10 psi. I was going to run e85 but the closes station to me is about 20 min one way so that's out of the question. With that in mind what's a safe compression @ 10 psi and pump gas? I didnt want to run meth if I could avoid it but I'd also like something that will last a while so I would appreciate some schooling from those of you who know some things.
Torqstorm
Well for some reason I'm having a hell of a hard time trying to locate a set of 317 heads. I was offered 243 heads for basically free but that would put me to 10.5 to 1. Would that be ok or should I just wait to find a set of 317s at a good price? I'm basically to the point that I either find a set of 317s or the ls1 shortblock sells and I buy a different motor lol.
As in 241 or 853 correct? I was always told low 9s was where I wanted to be. I just want something that'll handle 10 psi and wont grenade. I plan on getting my tuning done at Big 3 racing in N.E. ohio. So I'd like think that they can handle the "safe tune" part.
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I'd like to stay away from meth if I can. If I have to I guess I'll bite the bullet but I dont want to depend on it. 317s would be ideal but I cant get my hands on a set for whatever reason. I can get 243s for sure and possibly 853. 853 should put me at 10 to 1 correct?
I'd love to run e85 but closest gas station that has it is 15 to 20 min one way. Biggest thing is I just want it to last vs the oh I made 600 whp for 2 pulls and then it let go.
As far as heads go the 243s I can get for basically free. I have to double check on the 853s but I can trade my 706 heads straight up for them.
I'd love to run e85 but closest gas station that has it is 15 to 20 min one way. Biggest thing is I just want it to last vs the oh I made 600 whp for 2 pulls and then it let go.
As far as heads go the 243s I can get for basically free. I have to double check on the 853s but I can trade my 706 heads straight up for them.
I am at 5.5 lbs on stock compression on pump. I run about 17.5 degrees and it seems like itll take more but i havent bothered. The kits usually ran stock spark tables which, after an iat modifier, puts the spark a tad lower than where i am. I plan to install 706 heads on this engine with the same boost and run pump gas. In your case, 10lbs (no intercooler right?) Might be a bit too much. You could get the 243s and port them and possibily gain a few ccs from chamber work, mill them to ensure they are flat and put you near ls1 compression with a better flowing head. Win win. I think you could make this combo work but youre quickly dimiishing that safety zone etc etc
That being said, running a meth kit is probably a good idea as others have said. So is running a ported set of 317s. You got some options.
That being said, running a meth kit is probably a good idea as others have said. So is running a ported set of 317s. You got some options.
Restricted User
Joined: Mar 2014
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From: Ohio
Just get a cheap meth kit and run regular -20* F windshield washer fluid in it. Its not worth the hassle/risk not to when installing a kit takes ~4 hours and Washer fluid is only a couple bucks a gallon (or cheaper).
Porting heads with boost also isn't necessary. Even the lowest flowing of the heads (706) have made ~1100 HP at the wheels unported. Flow dynamics are greatly changed with boost, and a well designed setup won't need porting for power.
If you don't want to run meth, swap heads. If you don't want to swap heads, run meth.
Porting heads with boost also isn't necessary. Even the lowest flowing of the heads (706) have made ~1100 HP at the wheels unported. Flow dynamics are greatly changed with boost, and a well designed setup won't need porting for power.
If you don't want to run meth, swap heads. If you don't want to swap heads, run meth.
I really just didn't want to be dependent on meth I guess. If I have to run it I'll run it. 243 heads put me around 10.5 to 1 the stock heads put me at 10 to 1 and the 317s are around 9.6 to . I'm struggling to find a set of 317s. I will be intercooler for sure.
So far the plan is truck intake, 80lb injectors torqstorm supercharger @10 psi and a cam. Possibly a brute speed but undecided. Yes I will be intercooled. That being said should I just aim for the 853 heads to keep me around 10 to 1 and run meth. Which will probably just be washer fluid. Or go for the slightly better 243s? That's 10.5 to 1
So far the plan is truck intake, 80lb injectors torqstorm supercharger @10 psi and a cam. Possibly a brute speed but undecided. Yes I will be intercooled. That being said should I just aim for the 853 heads to keep me around 10 to 1 and run meth. Which will probably just be washer fluid. Or go for the slightly better 243s? That's 10.5 to 1
I really just didn't want to be dependent on meth I guess. If I have to run it I'll run it. 243 heads put me around 10.5 to 1 the stock heads put me at 10 to 1 and the 317s are around 9.6 to . I'm struggling to find a set of 317s. I will be intercooler for sure.
So far the plan is truck intake, 80lb injectors torqstorm supercharger @10 psi and a cam. Possibly a brute speed but undecided. Yes I will be intercooled. That being said should I just aim for the 853 heads to keep me around 10 to 1 and run meth. Which will probably just be washer fluid. Or go for the slightly better 243s? That's 10.5 to 1
So far the plan is truck intake, 80lb injectors torqstorm supercharger @10 psi and a cam. Possibly a brute speed but undecided. Yes I will be intercooled. That being said should I just aim for the 853 heads to keep me around 10 to 1 and run meth. Which will probably just be washer fluid. Or go for the slightly better 243s? That's 10.5 to 1
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ATI ProCharger and Moser Sales 260 672-2076
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
I recently had a customer switch from a Torqstorm to a ProCharger as he was fed up with the problems he was having with his blower. If he sees this, perhaps he'll chime in. Bob
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Would love to hear why he didnt like it. Fortunately for me, the decision on what supercharger I go with is probably one of my last. Once I figure out what heads I'm going with I'll make a final choice on a cam as well
Thanks everyone.