hi-compression with turbo
Thread Starter
Drifting
Joined: Feb 2004
Posts: 1,277
Likes: 1
From: Santa Maria CA
hi-compression with turbo
curious as to what is the highest compression any of you run with boost via a turbo or supercharger. This doesn't have to be a street application either. just seeing if anyone runnin 10.1 or better using race fuel?
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
Originally Posted by SHINOBI-X
curious as to what is the highest compression any of you run with boost via a turbo or supercharger. This doesn't have to be a street application either. just seeing if anyone runnin 10.1 or better using race fuel?
There there will be a direct dependence - than acting air is better cooled,
The it will be possible to lift pressure of boost on your high degree more.
Example (for compression 10.2:1)
No intrcooler = 5-6 psi
Small intercooler = 7-8 psi
Average intercooler = 9-10 psi
Large intercooler = 12-14 psi
Also depends on a corner of ignition very much. But it already other theme....
But it is better to lower a compression down to 8:1 - then all easier
I on my TwinTurboVette have made in general 7.8:1 JE forged - I of problems I do not test even on 16 psi
Good luck
Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
http://www.hotrod.com/techarticles/e...13_0312_turbo/
look halfway down.
"This 358ci small-block Chevy is about as rad as it can get and still use conventional 23-degree-valve-angle heads. Electronically managed by ACCEL Gen 7 DFI, the 10.0:1 engine runs a single large-frame Innovative GTB88 turbo and makes over 1,400 hp on C-16 race gas. Big race turbos are typically identified by the inducer orifice size--in this case 88 mm. "
look halfway down.
"This 358ci small-block Chevy is about as rad as it can get and still use conventional 23-degree-valve-angle heads. Electronically managed by ACCEL Gen 7 DFI, the 10.0:1 engine runs a single large-frame Innovative GTB88 turbo and makes over 1,400 hp on C-16 race gas. Big race turbos are typically identified by the inducer orifice size--in this case 88 mm. "
Thread Starter
Drifting
Joined: Feb 2004
Posts: 1,277
Likes: 1
From: Santa Maria CA
thanks guys. Im trying to figure out my final compression ratio with all my specs. anyone have a site they can refer me too to figure it out so i can be sure what compression im actually running?
Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
No but the math is 7th grade.
swept volume (bore area times stroke) divided by ending volume.(chamber volume + head gasket volume+piston dish volume)
That is assuming zero deck, if they are down the hole .010" then you will have to add that volume in as well.
Area of a circle= 3.1415 x (radius)^2 (squared)
To get cubic inches from cc's divide cc's by 16.3871
Should be easy for you to figure out from there. If you wanna get more advanced and figure out dynamic compression, let me know.
swept volume (bore area times stroke) divided by ending volume.(chamber volume + head gasket volume+piston dish volume)
That is assuming zero deck, if they are down the hole .010" then you will have to add that volume in as well.
Area of a circle= 3.1415 x (radius)^2 (squared)
To get cubic inches from cc's divide cc's by 16.3871
Should be easy for you to figure out from there. If you wanna get more advanced and figure out dynamic compression, let me know.
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
Your dynamic compression ratio will play as large a role, if not larger than your static CR when determining if you can safely run some sort of FI.
Do some research on cam selection and dynmaic compression ratio. You could have an 11:1 static ratio and still run moderate boost (10 psi or so) if the combo was set-up properly.
Good luck, let us know what you decide.
Do some research on cam selection and dynmaic compression ratio. You could have an 11:1 static ratio and still run moderate boost (10 psi or so) if the combo was set-up properly.
Good luck, let us know what you decide.
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
Originally Posted by SHINOBI-X
thanks guys. Im trying to figure out my final compression ratio with all my specs. anyone have a site they can refer me too to figure it out so i can be sure what compression im actually running?
http://www.rbracing-rsr.com/compression.htm
yedi
