High Compression Engine w/ Blower
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
High Compression Engine w/ Blower
Just out of curiosity, and I know lower compression motors are better for boost. But would it be possible to run a small roots blower on a motor with 10.2:1 compression and aluminum heads at a low boost setup and run 91 octane?
I see C5s with blowers all the time so I would assume that it's possible.
I see C5s with blowers all the time so I would assume that it's possible.
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 5
From: Austin Texas
They are usually intercolled, and boost limited to 6 or 7 lbs. Alot of money for little boost, IMO. I am going to do a centrifugal Pro-Charger someday, and they want no more that 9:1 c/r max, using forged pistons of course. I'm gonna do 12 psi boost, blow-thru carbureted.
Racer
Joined: Jul 2005
Posts: 317
Likes: 0
From: PA
It's possible, your virtual compression is going to be very high depending on the boost you want to run, an intercooler for that is a must. As far as for the new motors, they have a very good ECU that can make adjustments for fueling/timing very fast. If your considering doing this I would look into an ECU of some kind, you'll be very prone to putting a piston out the side of your motor if you go lean.
Le Mans Master
Joined: Nov 2004
Posts: 6,434
Likes: 0
St. Jude Donor '07
Originally Posted by big_G
They are usually intercolled, and boost limited to 6 or 7 lbs. Alot of money for little boost, IMO. I am going to do a centrifugal Pro-Charger someday, and they want no more that 9:1 c/r max, using forged pistons of course. I'm gonna do 12 psi boost, blow-thru carbureted.
Racer
Joined: Jul 2005
Posts: 317
Likes: 0
From: PA
Yes, you can run very high boost depending on what your static compression is, the guys running high boost on the street are probabley around 8:1 , remember, unless your going all out racing you want to keep it reliable and practical. The key is to monitor you fuel delivery so you don't go lean, the more boost the higher the cylinder pressures and if the fuel is not right...BANG!! I ran 18psi on my 4 cylinder with 7.5:1 and would chew up mustangs, when I calibrated my ECU the fuel was compensated. Very good idea to run an EGT and AFR gauge.
Last edited by pauvil; Nov 18, 2005 at 09:16 PM.
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Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
http://www.aquamist.co.uk/dc/coollin...el/jankel.html
The link above shows a guy using a Chevy small block with 10:1 compression and 10 pounds of boost. He makes 535net hp and 600+ pounds of torque. He uses water injection.
Chuck
The link above shows a guy using a Chevy small block with 10:1 compression and 10 pounds of boost. He makes 535net hp and 600+ pounds of torque. He uses water injection.
Chuck