Thinner head gasket to increase compression ratio? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 05-04-2004, 11:16 PM
Member
 
Last photo:
Join Date: Jun 2003
Location: Oklahoma
Posts: 96
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thinner head gasket to increase compression ratio?

I am sure this has been discussed before but I can't find it. Your help would be greatly appreciated.

What is the approximate amount of increase in the compression ratio of a Mopar 360 if the head gasket thickness is decreased by .020?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-04-2004, 11:41 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,486
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
Not much, not even half of a ratio. You dohn't want to do that to increase compression anyway, it will screw up your quench and make your motor run like shiz.

K
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-04-2004, 11:46 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 60 Times in 57 Posts
Thinner head gaskets increase quench, but honestly, as Killer already said, I`m not sure just a head gasket change would be worth all the effort for a few horsepower gain. If the gasket is a shim type you`ll have to make sure the heads and block are flat, since shim type gaskets are less forgiving than after market gaskets. If the pistons are dish tops it wouldn`t have any effect on quench anyway, and a less than a half a point of compression increase you likely wouldn`t even notice.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-04-2004, 11:53 PM
Sudden Psycho 31's Avatar
Member
 
Last photo:
Join Date: May 2004
Location: Southern Indiana
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
to get an acurate measurement we need more info...

if i asked how much water would i get if i took out 2 inches out of a sink?
how big is the sink, kitchen, bathroom, etc ... you get the idea

to calc it
1. head chamber volume
2. head gasket bore
3. head gasket thickness, compressed ( your -.020 part)
4. piston down bore, (zero if decked completely)

i ran a quick scenario, with all assumptions
1. 74cc
2. 4.1 in
3. .050 in
4. .020 in
equals 9.29 compression

just changing 3. to .030 (your .020 less) equals 9.71 so you gain a little under .4 compression.

beter heads will chang that .020 more drastically

64cc and zero decked will gain more than .7

hope this helps
later,
31
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 07:39 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.