compression ratio for boost
04-13-2007, 03:27 AM
#1
5th Gear Member
Thread Starter
Join Date: Nov 2006
Location: arlington,WA
Posts: 3,743
compression ratio for boost
what is the maximun compression ratio that u can safely run a supercharger ?what is the pushing the limits the pistons that i just bought other thread are 9.7 to 1 can i run boost on this or am i stuck with nitrous?
04-13-2007, 09:24 AM
#4
Join Date: Apr 2007
Posts: 5
RE: compression ratio for boost
ya i am runing a very mild set up. I have a vortech v-1 @ 5 lbs. and just got my motor together. I'm running 7.5 to 1 compression.It runs great, but iam thinking about milling my 63cc chamberGT-40 heads down to up the compression a little. It feels the same as my last motor that was runningsame set up at 8.5 to 1.... but no track time yet for verification. still breaking in the new slugs. later man.... (i'd shoot for 8.5 to 1) anything higher and race fuel is needed........ Im trying for a supercharged engine efficient enough for ethanol or regular unleaded, using lower comp.We'll see how it does come dyno time with the ethanol and regular uinleaded tests.
[IMG]local://upfiles/66472/01C95A5365B146F181F9BCE7D54DE0A9.jpg[/IMG]
[IMG]local://upfiles/66472/01C95A5365B146F181F9BCE7D54DE0A9.jpg[/IMG]
04-13-2007, 11:47 AM
#5
6th Gear Member
Join Date: Feb 2006
Location:
Posts: 5,263
RE: compression ratio for boost
you can run boost on a 10-1 engine, it just limits
how much much you can do.
I plan on 10-12psi on intercooled turbo with 9.5-1 compression
should be fine.
adding an intercooler will allow more more boost too
or water meth injection.
There is more to figuring compression then just the pistons.
What are you engine specs and I can tell you what it really is going to be.
how much much you can do.
I plan on 10-12psi on intercooled turbo with 9.5-1 compression
should be fine.
adding an intercooler will allow more more boost too
or water meth injection.
There is more to figuring compression then just the pistons.
What are you engine specs and I can tell you what it really is going to be.
04-13-2007, 01:07 PM
#6
RE: compression ratio for boost
ORIGINAL: r.barn
you can run boost on a 10-1 engine, it just limits
how much much you can do.
I plan on 10-12psi on intercooled turbo with 9.5-1 compression
should be fine.
adding an intercooler will allow more more boost too
or water meth injection.
There is more to figuring compression then just the pistons.
What are you engine specs and I can tell you what it really is going to be.
you can run boost on a 10-1 engine, it just limits
how much much you can do.
I plan on 10-12psi on intercooled turbo with 9.5-1 compression
should be fine.
adding an intercooler will allow more more boost too
or water meth injection.
There is more to figuring compression then just the pistons.
What are you engine specs and I can tell you what it really is going to be.
04-13-2007, 01:24 PM
#8
6th Gear Member
Join Date: May 2004
Location: las vegas, nv
Posts: 9,092
RE: compression ratio for boost
ORIGINAL: knewt
ya i am runing a very mild set up. I have a vortech v-1 @ 5 lbs. and just got my motor together. I'm running 7.5 to 1 compression.It runs great, but iam thinking about milling my 63cc chamberGT-40 heads down to up the compression a little. It feels the same as my last motor that was runningsame set up at 8.5 to 1.... but no track time yet for verification. still breaking in the new slugs. later man.... (i'd shoot for 8.5 to 1) anything higher and race fuel is needed........ Im trying for a supercharged engine efficient enough for ethanol or regular unleaded, using lower comp.We'll see how it does come dyno time with the ethanol and regular uinleaded tests.
[IMG]local://upfiles/66472/01C95A5365B146F181F9BCE7D54DE0A9.jpg[/IMG]
ya i am runing a very mild set up. I have a vortech v-1 @ 5 lbs. and just got my motor together. I'm running 7.5 to 1 compression.It runs great, but iam thinking about milling my 63cc chamberGT-40 heads down to up the compression a little. It feels the same as my last motor that was runningsame set up at 8.5 to 1.... but no track time yet for verification. still breaking in the new slugs. later man.... (i'd shoot for 8.5 to 1) anything higher and race fuel is needed........ Im trying for a supercharged engine efficient enough for ethanol or regular unleaded, using lower comp.We'll see how it does come dyno time with the ethanol and regular uinleaded tests.
[IMG]local://upfiles/66472/01C95A5365B146F181F9BCE7D54DE0A9.jpg[/IMG]
i run 9.7:1 compression with 9psi of boost but i also spray methanol
04-13-2007, 01:31 PM
#9
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Join Date: Dec 2005
Location:
Posts: 2,005
RE: compression ratio for boost
Id never go above 9 to1 without some kind of intercooling, but you shouldnt run high compression ratio with a boosted car anyways, you will make more power by keeping the compression ratio lower to a pointbecause then you can run even more boost and will always equate to more power then a little bit more compression, and you will have less trouble with detonation. A car with 8.5 to 1 with 15 pounds of boost with make more power in most cases then a car with 9 with 10. 1