LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Compression Ratio

Thread Tools
 
Search this Thread
 
Old Sep 26, 2008 | 07:22 AM
  #1  
Mattsz28's Avatar
Thread Starter
On The Tree
iTrader: (1)
 
Joined: May 2007
Posts: 150
Likes: 0
Default Compression Ratio

Is 11.7:1 too much for Pump gas on an LT1?

Motor's a 383 with cola crank, diamond pistons, dart pro heads ported by Biddy Winward (NHRA Hall of fame engine builder), thats all the basics I suppose.

What do you guys think?
Reply
Old Sep 26, 2008 | 07:37 AM
  #2  
1redta's Avatar
TECH Apprentice
 
Joined: Dec 2004
Posts: 347
Likes: 0
From: fort campbell
Default re

probaly ok on 93, you need to figure out your dynamic compresion ratio to decide if the motor is capable of running in that compresion ratio Check out kbsilvolite for the calculator. Art
Reply
Old Sep 26, 2008 | 07:49 AM
  #3  
BlackScreaminMachine's Avatar
Internet Mechanic
20 Year Member
iTrader: (17)
 
Joined: May 2005
Posts: 9,830
Likes: 2
From: Wallingford CT
Default

yea, it seems DCR is more important, statically speaking I ran 11.25 to 1 on a 6" rod, milled heads (beleived 0.030), -16cc dished pistions w/ a LT4 hotcam w/o issue
Reply
Old Sep 26, 2008 | 08:14 AM
  #4  
Stroked96Bowtie's Avatar
TECH Enthusiast
15 Year Member
iTrader: (22)
 
Joined: May 2007
Posts: 739
Likes: 0
From: DFW, Tx
Default

http://www.empirenet.com/pkelley2/DynamicCR.html

Great resource on compression and calculator at the bottom of the page. This calculator takes everything including the cam into consideration. I figured compression with this tool and had my machinist do the same, was dead on.
Reply




All times are GMT -5. The time now is 11:15 PM.

story-0
10 Reasons Daily Driving a Swap Project SUCKS! (& 1 Reason to Do It Anyway)

Slideshow: 10 reasons daily-driving a swap project might not be for you. Or is it?

By Michael S. Palmer | 2026-06-17 09:39:05


VIEW MORE
story-1
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-2
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-06-18 10:26:23


VIEW MORE
story-3
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-4
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-5
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-6
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-7
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-8
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-9
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