Carbureted LSX Forum Carburetors | Carbed Intakes | Carb Tuning Tips for LSX Enthusiasts

Quench and compression

Thread Tools
 
Search this Thread
 
Old Dec 10, 2010 | 09:53 PM
  #1  
e-racer-ls-1's Avatar
Thread Starter
On The Tree
iTrader: (1)
 
Joined: Aug 2007
Posts: 155
Likes: 0
Default Quench and compression

I want to run as tight a quench as I can,around .040. Has anyone run a set-up like mine.4 inch stroke,6.125 rod custom wiseco pistons -3 CC flat tops.I haven't done the math yet but any guess on the C.R.???Thanks
Reply
Old Dec 11, 2010 | 09:57 AM
  #2  
LSwonderfull's Avatar
On The Tree
 
Joined: Nov 2005
Posts: 184
Likes: 0
Default

I have .030" quench with diamond flat tops, .050" GM MLS 6.0 gaskets,.020" positve deck height, 11.7 to 1 comp with stock 70cc L92 chambers.
Reply
Old Dec 11, 2010 | 09:59 AM
  #3  
rojs234's Avatar
TECH Regular
iTrader: (5)
 
Joined: Jan 2008
Posts: 452
Likes: 2
From: Sparta, Mo. in southwest Missouri
Default

Originally Posted by e-racer-ls-1
I want to run as tight a quench as I can,around .040. Has anyone run a set-up like mine.4 inch stroke,6.125 rod custom wiseco pistons -3 CC flat tops.I haven't done the math yet but any guess on the C.R.???Thanks
If I remember right, you're running L92 heads. If they haven't been milled, they have a chamber just slightly over 70 CC. Since you have flat tops, and you know the volume of the notches, all you need is the deck height, either above or below the block. You can check this close enough with a straight edge and a feeler gauge. THEN...go to www.NOT2FAST.com. They have the neatest calculator I've found. You just put in the numbers you have and it calculates everything out as you go. Gives static compression ratio, and also dynamic compression ratio IF YOU KNOW THE INTAKE CLOSING POINT on your cam. jJust read the instructions, and remember to put the deck height in opposite of what you think it should be...guess how I know, ..above the deck is put in as a - and below the block is a +. Try it, you'll like it. Ron
Reply
Old Dec 11, 2010 | 01:06 PM
  #4  
e-racer-ls-1's Avatar
Thread Starter
On The Tree
iTrader: (1)
 
Joined: Aug 2007
Posts: 155
Likes: 0
Default

Originally Posted by rojs234
If I remember right, you're running L92 heads. If they haven't been milled, they have a chamber just slightly over 70 CC. Since you have flat tops, and you know the volume of the notches, all you need is the deck height, either above or below the block. You can check this close enough with a straight edge and a feeler gauge. THEN...go to www.NOT2FAST.com. They have the neatest calculator I've found. You just put in the numbers you have and it calculates everything out as you go. Gives static compression ratio, and also dynamic compression ratio IF YOU KNOW THE INTAKE CLOSING POINT on your cam. jJust read the instructions, and remember to put the deck height in opposite of what you think it should be...guess how I know, ..above the deck is put in as a - and below the block is a +. Try it, you'll like it. Ron
Thanks,I didn't have pat g spec me a cam yet but will save this post.
Reply
Old Dec 12, 2010 | 12:47 AM
  #5  
NemeSS's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (127)
 
Joined: Sep 2005
Posts: 6,889
Likes: 9
From: Houston,TX
Default

i prefer a +.015 deck height with gm .053 compressed gaskets .035-.040 range for forced induction or n/a
Reply




All times are GMT -5. The time now is 06:15 PM.

story-0
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 | 2026-06-04 18:13:20


VIEW MORE
story-1
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 | 2026-05-28 11:05:11


VIEW MORE
story-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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