Forced Induction Z06
Thread Starter
Advanced
Joined: May 2007
Posts: 62
Likes: 1
From: New Lenox IL
Forced Induction Z06
I'm considering forced induction for a C6 Z06, one way to lower the compression is to switch out the rotating assembly and use lower compression pistons.
Are there any companies which sell aftermarket heads with larger combustion chambers to lower the compression? Or maybe a company which CNCs the combustion chamber of stock heads to lower the compression?
Thanks,
-Jeff
Are there any companies which sell aftermarket heads with larger combustion chambers to lower the compression? Or maybe a company which CNCs the combustion chamber of stock heads to lower the compression?
Thanks,
-Jeff
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
The stock heads have 70cc chambers, I doubt you will find any aftermarket heads with larger chambers. Besides that changing out the pistons for a set of forged low compression units will add longevity to your engines life span in a FI application.
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
Melting Slicks
Joined: Feb 2006
Posts: 3,159
Likes: 247
From: LAS VEGAS NV
St. Jude Donor '08
you want 700rwhp+.. you will need to open up that wallet and get some forged pistons , fuel system, clutch, tranny, tires, etc...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Advanced
Joined: May 2007
Posts: 62
Likes: 1
From: New Lenox IL
660 rwhp sounds pretty good to me!
I understand the benefits of putting in a new rotating assembly with dished pistons, I'm just looking to avoid the expense of pulling the motor. I'm hoping I can pull the heads and take them to a shop and have the combustion chambers ported out to drop the compression, I'll talk to some shops and see if its possible.
It's sad that the stock pistons in my 91 Mustang are better than LS7 pistons, but Ill get over it.
I understand the benefits of putting in a new rotating assembly with dished pistons, I'm just looking to avoid the expense of pulling the motor. I'm hoping I can pull the heads and take them to a shop and have the combustion chambers ported out to drop the compression, I'll talk to some shops and see if its possible.
It's sad that the stock pistons in my 91 Mustang are better than LS7 pistons, but Ill get over it.
Former Vendor
Joined: Jul 2008
Posts: 4,327
Likes: 7
From: Oxnard SoCal www.aacorvette.com www.superchargersuperstore.com
Pro
Joined: Sep 2007
Posts: 566
Likes: 17
From: Austin TX
Former Vendor
Joined: Mar 2004
Posts: 3,442
Likes: 18
From: Winchester CA
I'm considering forced induction for a C6 Z06, one way to lower the compression is to switch out the rotating assembly and use lower compression pistons.
Are there any companies which sell aftermarket heads with larger combustion chambers to lower the compression? Or maybe a company which CNCs the combustion chamber of stock heads to lower the compression?
Thanks,
-Jeff
Are there any companies which sell aftermarket heads with larger combustion chambers to lower the compression? Or maybe a company which CNCs the combustion chamber of stock heads to lower the compression?
Thanks,
-Jeff
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,225
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
How much power are you looking to make from your build?
__________________
C5/C6 and C7 Supercharging Specialist
ECS Supercharger Kits / Mantic Clutches
www.EastCoastSupercharging.com
Facebook Page
ECS YouTube Channel
C5/C6 and C7 Supercharging Specialist
ECS Supercharger Kits / Mantic Clutches
www.EastCoastSupercharging.com
Facebook Page
ECS YouTube Channel
Melting Slicks
Joined: Sep 2002
Posts: 3,064
Likes: 95
From: MI
there maybe companies that open up the chambers, or you can also order some thicker head gaskets from cometic, it will no doubt be a custom gasket..... if it was my car, (judging from my experience), i would pull the motor rebuild it, at least put forged dish pistons and resleeve the block with darton dry sleeves, among other misc. upgrades.... if you really want a solid setup rebuild it with forged rods (callies, manley, etc etc), give me a call if you have any questions, i have built and tuned a few of these......
Burning Brakes
Joined: Jan 2008
Posts: 922
Likes: 1
From: Columbus Ohio
You see the public vendors doing the same thing here, Taylor @ Dallas expert in the field, Steve @ A&A expert in the field...
Opening up the combustion chambers is the wrong direction, and after you pay to CNC the factory heads, valve seat work, valves, and all the head work that is required the cost to install a forged more durable piston is the better direction, for your wallet an the reliability of the engine.
Opening up the combustion chambers is the wrong direction, and after you pay to CNC the factory heads, valve seat work, valves, and all the head work that is required the cost to install a forged more durable piston is the better direction, for your wallet an the reliability of the engine.
Former Vendor
Joined: May 2003
Posts: 2,173
Likes: 2
From: Dallas Texas
You see the public vendors doing the same thing here, Taylor @ Dallas expert in the field, Steve @ A&A expert in the field...
Opening up the combustion chambers is the wrong direction, and after you pay to CNC the factory heads, valve seat work, valves, and all the head work that is required the cost to install a forged more durable piston is the better direction, for your wallet an the reliability of the engine.
Opening up the combustion chambers is the wrong direction, and after you pay to CNC the factory heads, valve seat work, valves, and all the head work that is required the cost to install a forged more durable piston is the better direction, for your wallet an the reliability of the engine.
For what this guys wants, heads are a simple thing to do. Its just CR, thats it. He could drop it to 10.5ish~, take the edge off of it, and do it in his garage, and he can do pistons/rods later.
Former Vendor
Joined: Jun 2006
Posts: 1,622
Likes: 3
From: Dallas TX
Good points being made here but in my opinion, there is no reason to drop compression by a small amount for the cost incurred.
I don't care if you are able to hog the heads out enough to drop the compression down to 9.5:1. You still have a fragile piston doing the work. The piston is the weak link and static CR isn't going to matter with boost on top.
I would argue that neither of these are any safer combination given similar cylinder pressures and charge temps:
11.0:1CR with 700rwhp @ 8psi
OR
10.0:1CR with 700rwhp @ 10psi
I don't care if you are able to hog the heads out enough to drop the compression down to 9.5:1. You still have a fragile piston doing the work. The piston is the weak link and static CR isn't going to matter with boost on top.
I would argue that neither of these are any safer combination given similar cylinder pressures and charge temps:
11.0:1CR with 700rwhp @ 8psi
OR
10.0:1CR with 700rwhp @ 10psi
Last edited by Taylor@DallasPerformance; Jun 18, 2009 at 06:22 PM.