Lowering compression ratio?
Thread Starter
Instructor
Joined: Apr 2011
Posts: 212
Likes: 1
From: Dallas TX
Lowering compression ratio?
I have a 2011 GS (auto) that now has the Edelbrock blower installed. The limit of that blower is claimed to be ~600hp (RW?). I assume a main impediment to more power is the high compression ratio of this motor, but it may be the durability of the internals.
If CR is a limiting factor, what's the easiest way to lower it? Head spacers? Different heads? Different pistons?
Is it possible (and practical) to remove the pistons from the bottom, without pulling the motor? If so, this may be an easy path. I assume one could get a ring compressor into place inside the bottom end to allow reinserting new pistons but maybe not. Anyway, if this can be done, it would allow going back with better rods, pistons, bearings, etc.
So will lowering the CR help? Suggestions welcome.
If CR is a limiting factor, what's the easiest way to lower it? Head spacers? Different heads? Different pistons?
Is it possible (and practical) to remove the pistons from the bottom, without pulling the motor? If so, this may be an easy path. I assume one could get a ring compressor into place inside the bottom end to allow reinserting new pistons but maybe not. Anyway, if this can be done, it would allow going back with better rods, pistons, bearings, etc.
So will lowering the CR help? Suggestions welcome.
Banned Scam/Spammer
Joined: Oct 2010
Posts: 5,469
Likes: 20
From: West Bloomfield MI
The motor has to be pulled to do it right as there is machining involved. Main bolts, rods, rings, balancing the rotating assembly, pistons, etc. Not something that happens with the motor in the car with the blower on top.
Le Mans Master
Joined: Dec 2005
Posts: 6,995
Likes: 1,680
From: Southeast TX
Pistons don't come out the bottom. The comp ratio won't hold you back either. It's an asset....not a liability at any power level you're capable of reaching. You will run out of blower before you need to decrease the comp ratio.
