PONTIAC ZONE TECH FORUMS
 

Go Back   PONTIAC ZONE TECH FORUMS >
Engine Tech
> Engine Tech Discussion - Street or Strip
User Name
Password

Reply
 
Thread Tools
Old 06-17-11, 11:11PM   #1
Bandit 76
Registered User
 
Bandit 76's Avatar
 
Join Date: Mar 2011
Location: springfield, il.
Posts: 9
Default rod side clearance

rod side clearance, what is safe on a '74 455 w/ stock rods and crank? (forged pistons)
I am assembling this engine (just back from machine shop) and my no# 4 and 3 rods (married journal) clearance seem awfully loose, I measured, and its .029 another is .012 and other two are less than that?
I guess what i'm asking is what is max and min rod side clearance? this motor prob. wont go over 5500 rpm, not going to be over revved, it's a street engine.
might get a little squeeze in the future (150 shot)
__________________
'76 T/A 462P 700R4
Bandit 76 is offline   Reply With Quote
Old 06-17-11, 11:44PM   #2
Polar-Pontiac
Northern Racer
 
Polar-Pontiac's Avatar
 
Join Date: Jan 2006
Location: Timmins Ont
Posts: 4,285
Default

Quote:
Originally Posted by Bandit 76 View Post
rod side clearance, what is safe on a '74 455 w/ stock rods and crank? (forged pistons)
I am assembling this engine (just back from machine shop) and my no# 4 and 3 rods (married journal) clearance seem awfully loose, I measured, and its .029 another is .012 and other two are less than that?
I guess what i'm asking is what is max and min rod side clearance? this motor prob. wont go over 5500 rpm, not going to be over revved, it's a street engine.
might get a little squeeze in the future (150 shot)
018-.022".....
Polar-Pontiac is offline   Reply With Quote
Old 06-18-11, 01:26AM   #3
Bandit 76
Registered User
 
Bandit 76's Avatar
 
Join Date: Mar 2011
Location: springfield, il.
Posts: 9
Default

what will happen if i run it like it is? what are my options?
__________________
'76 T/A 462P 700R4
Bandit 76 is offline   Reply With Quote
Old 06-18-11, 08:43AM   #4
TIN TIGR
Pontiholic
 
Join Date: Feb 2008
Location: concord ca
Posts: 572
Default

.029 aint too bad..run it..let that oil flow..
TIN TIGR is offline   Reply With Quote
Old 06-18-11, 08:48AM   #5
Polar-Pontiac
Northern Racer
 
Polar-Pontiac's Avatar
 
Join Date: Jan 2006
Location: Timmins Ont
Posts: 4,285
Default

Quote:
Originally Posted by Bandit 76 View Post
what will happen if i run it like it is? what are my options?
Your option are to get your self a good set of rods and throw that cast shit in the trash.Or run it with 20/50 oil and wait for the BOOM!!!
Polar-Pontiac is offline   Reply With Quote
Old 06-18-11, 11:47AM   #6
Mr. PBody
Registered User
 
Join Date: Feb 2009
Location: Chesterfield, VA
Posts: 801
Default

It isn't so much the total clearance as it is being "even". Oil is like electricity. It will follow the path of least resistance. Variations of so much are a recipe for disaster. "Hydrostatic balance" is among the more misunderstood and important aspects of a durable engine.

Mark's right. Dump the cast rods.

Jim
Mr. PBody is offline   Reply With Quote
Old 06-18-11, 12:47PM   #7
probird
Insane Injun
 
probird's Avatar
 
Join Date: May 2006
Location: Athens, IL.
Posts: 322
Default

Loose is better than tight. I would worry more about the rods that are .012 and less than the .029.
probird is offline   Reply With Quote
Old 06-18-11, 03:21PM   #8
Bandit 76
Registered User
 
Bandit 76's Avatar
 
Join Date: Mar 2011
Location: springfield, il.
Posts: 9
Default

ok, lots of good info here. I appreciate everyone's input on this.
__________________
'76 T/A 462P 700R4
Bandit 76 is offline   Reply With Quote
Old 06-19-11, 10:22AM   #9
Ken Keefer
Registered User
 
Join Date: Apr 2011
Location: Brooksville, Fl.
Posts: 164
Thumbs up

Quote:
Originally Posted by probird View Post
Loose is better than tight. I would worry more about the rods that are .012 and less than the .029.

X 2

.016 is a minumum for any performance engine that is going to see a lot of upper rpm on a regular basis.
__________________
Ken's Speed & Machine Shop
512 S. Main St.
Brooksville, Fl. 34601
1-352-796-8800
pdsales@tampabay.rr.com
http://Pontiacdude.cc
Your ATI ProCharger dealer for Pure Pontiac Blow thru applications.
Ken Keefer is offline   Reply With Quote
Reply


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

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
piston to head clearance? jeffb Engine Tech Discussion - Street or Strip 9 05-22-11 04:13PM
Surfacing intake manifolds; something to think about! gtofreek Engine Tech Discussion - Street or Strip 1 02-07-09 12:23PM
Anyone have clearance issues using the Tomahawk Hurricane intake Bird Catcher400 Aftermarket News & Products 24 11-28-07 10:52PM
Rod side clearance on street/race motor quick67bird Engine Tech Discussion - Street or Strip 3 12-19-05 11:03PM
Side pipes on a 455 T/A 1bad77 1958 - 1981 Pontiac Tech & Restoration 6 12-12-05 10:50AM


All times are GMT -3. The time now is 06:39AM.

Featured Ads
Ken's Speed & Machine
Mayhem Turbocharging

Carter Cryogenics.  What can we freeze for you?

Pacific Performance Racing

Central Virginia Machine Service.  Home of the Injun Engine!

All Pontiac Engine Kits

Larry's Auto Machine.  Full serivce auto, marine machine shop, domestic and foreign.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
2001 - 2007 PontiacZone.com
Page generated in 0.10522 seconds with 10 queries