Go Back  Offshoreonly.com > Technical > General Q & A
Optimal Squish >

Optimal Squish

Notices

Optimal Squish

Thread Tools
 
Old 03-03-2015 | 09:37 AM
  #1  
Thread Starter
Registered
 
Joined: Jul 2012
Posts: 166
Likes: 0
From: GPW Michigan
Default Optimal Squish

What would be the optimal squish range for a 454 NA build? AFR cyl. heads 10 to 1 compression.

Thanks

Jeff
sbslinde is offline  
Reply
Old 03-03-2015 | 09:52 AM
  #2  
Registered
 
Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
Default

With good parts .035 would be safe.
Black Baja is offline  
Reply
Old 03-03-2015 | 11:49 AM
  #3  
Registered
20 Year Member
 
Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Default

Originally Posted by sbslinde
What would be the optimal squish range for a 454 NA build? AFR cyl. heads 10 to 1 compression.

Thanks

Jeff
Ditching the blowers Jeff?
MILD THUNDER is offline  
Reply
Old 03-03-2015 | 12:18 PM
  #4  
Thread Starter
Registered
 
Joined: Jul 2012
Posts: 166
Likes: 0
From: GPW Michigan
Default

No blowers for me. Can't afford what I have now.
sbslinde is offline  
Reply
Old 03-03-2015 | 12:40 PM
  #5  
Registered
 
Joined: Nov 2005
Posts: 2,399
Likes: 15
From: Toronto, Canada
Default

.040
adk61 is offline  
Reply
Old 03-03-2015 | 01:11 PM
  #6  
TomZ's Avatar
Platinum Member
25 Year Member
Platinum Member
 
Joined: Feb 2001
Posts: 4,290
Likes: 1,450
From: Virginia Beach
Default

Keep in mind that .035 is the minimal safe piston to cylinder head clearance. I like a little more of a safety margin myself... mine will go together at .044 (piston .005 in the hole and a .039 gasket). But then again, mine will be blown so a tight quench isn't really necessary.

Just my thoughts... by far no expert.... just my experiences.
TomZ is offline  
Reply
Old 03-03-2015 | 01:18 PM
  #7  
Registered
 
Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
Default

Originally Posted by TomZ
Keep in mind that .035 is the minimal safe piston to cylinder head clearance. I like a little more of a safety margin myself... mine will go together at .044 (piston .005 in the hole and a .039 gasket). But then again, mine will be blown so a tight quench isn't really necessary.

Just my thoughts... by far no expert.... just my experiences.
I've got less than that on my 632
Black Baja is offline  
Reply
Old 03-03-2015 | 01:55 PM
  #8  
TomZ's Avatar
Platinum Member
25 Year Member
Platinum Member
 
Joined: Feb 2001
Posts: 4,290
Likes: 1,450
From: Virginia Beach
Default

Originally Posted by Black Baja
I've got less than that on my 632
Less than the minimum? If so, can you elaborate on why? Mine at .044 is still considered tight. Books and articles I've read on this subject say that the tighter than the minimum isn't necessary. Just trying to understand is all.
TomZ is offline  
Reply
Old 03-03-2015 | 02:28 PM
  #9  
Registered
 
Joined: Nov 2005
Posts: 2,399
Likes: 15
From: Toronto, Canada
Default

quench/squish supports combustion process by squeezing the charge into the chamber where the spark occurs, also has a cooling effect as the quench area runs cooler than the rest of the combustion area... this will allow for a higher compression ratio to be used and aid in the quality of combustion achieved... properly designed quench is like upping the octane, promotes a better burn!!
adk61 is offline  
Reply
Old 03-03-2015 | 02:34 PM
  #10  
Registered
 
Joined: Nov 2005
Posts: 2,399
Likes: 15
From: Toronto, Canada
Default

"Zero" decking the block will allow tuning quench with the head gasket, the proper spec for desired quench is a debate that's been around since Chrysler was a cowboy!!! compression ratio and chamber design are factors but on average .035-.060 what I've seen in the field
adk61 is offline  
Reply


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.