Forced Induction Superchargers | Turbochargers | Intercoolers

Max boost with Stock compr w/ built motor

Thread Tools
 
Search this Thread
 
Old Dec 30, 2007 | 01:44 AM
  #1  
tilly's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (5)
 
Joined: Apr 2006
Posts: 317
Likes: 0
From: KC:K
Default Max boost with Stock compr w/ built motor

Hey

I have an opportunity to purchase a 347 cu in forged short block with mahle pistons and scat rods. It has a flat top piston with 4cc valve reliefs.

Now I am trying to drop the compression with different head with bigger combustion chambers. Now the lowest I think I can get the compression is 9.8:1 with a .051in gasket thickness with a 66cc combustion chamber.

Now I figured it would not be safe to run a gasket that thick in boost applications. Now what would be the maximum amount of boost could i run before I have to seriously worry about detonation on stock compression with 91 octane with a decent tune with a decent blower or turbo (high CFM)?
Reply
Old Dec 30, 2007 | 05:57 AM
  #2  
ls1290's Avatar
Dumb Ass Vette Moderator
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (20)
 
Joined: Jun 2002
Posts: 4,281
Likes: 2
From: Colorado
Default

Why not run 72cc 317, aka 6.0L, heads? That would drop the compression level lower to about 9.2? They are cheap and a great way to lower compression effectively.

Keith
Reply
Old Dec 30, 2007 | 07:14 AM
  #3  
Websy21's Avatar
TECH Addict
iTrader: (34)
 
Joined: Jun 2007
Posts: 2,346
Likes: 1
From: Alberta, Canada
Default

Originally Posted by ls1290
Why not run 72cc 317, aka 6.0L, heads? That would drop the compression level lower to about 9.2? They are cheap and a great way to lower compression effectively.

Keith
Beat me to it
Reply
Old Dec 30, 2007 | 11:10 AM
  #4  
tilly's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (5)
 
Joined: Apr 2006
Posts: 317
Likes: 0
From: KC:K
Default

SO lets say I do not use that head. How much boost could I put into my motor on 91 octane with meth injection before I seriously have to worry about detonation with a decent tune running 10:1 compression.
Reply
Old Dec 30, 2007 | 01:11 PM
  #5  
NemesisC5's Avatar
TECH Resident
 
Joined: Jan 2007
Posts: 751
Likes: 0
From: Texas
Default

Originally Posted by tilly
SO lets say I do not use that head. How much boost could I put into my motor on 91 octane with meth injection before I seriously have to worry about detonation with a decent tune running 10:1 compression.
Been running that for 2 years on my Corvette (Shell 93 with Torco OB & Meth)...9psi revving to 6900 having a blast pounding the street
Reply
Old Dec 30, 2007 | 03:08 PM
  #6  
Websy21's Avatar
TECH Addict
iTrader: (34)
 
Joined: Jun 2007
Posts: 2,346
Likes: 1
From: Alberta, Canada
Default

Originally Posted by NemesisC5
Been running that for 2 years on my Corvette (Shell 93 with Torco OB & Meth)...9psi revving to 6900 having a blast pounding the street
Thats nice its holding together for you at those power levels, must be fun!
Reply




All times are GMT -5. The time now is 02:48 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE