Crankshaft turned to .020 rod and main , is it safe? - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 08-31-2006, 08:20 PM
Registered User
Last photo:
Join Date: Feb 2004
Location: puerto rico
Posts: 242
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Crankshaft turned to .020 rod and main , is it safe?

i have a 350 engine that has already been turned to .010 . the journals are in bad shape. so i`m deciding to turn the crank .020 over. and i was wondering if this is ok with not balancing it? what is the best bearing Brand to use? does it have to be a chamfer bearing? and what about grooves 3/4 , half or ful groove for the rods?

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 08-31-2006, 10:07 PM
Join Date: Aug 2003
Location: California
Posts: 908
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 3 Posts

I can answer the first part of this question. Turning the crank .020 "under-size" and then buying .020 "over-sized" bearings is safe. You could go to .030 but then you are pushing the limits on a high horsepower engine.

Picking the "best" bearings is a coin toss. Just buy a name brand and you will be fine.

Now again this is just my choice but I like no grooves on the bearings. The oil supply hole rotates, so all parts of the bearing get oil on every revolution of the crank. Now others will have their thoughts so listen to them and then, in the end, you get to make your choice.

To balance or not? Again it is done by all the good engine builders to get every last bit of horsepower out of an engine, but do you HAVE to balance the Again this is just my thinking. I have built many engines and they all have lasted for years and years without balancing the crankshaft but who knows maybe they would have lasted EVEN longer if I had. Again if you have the money go for it but if things are tight just put it together and drive the wheels off.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-01-2006, 07:10 AM
jimbobneutral's Avatar
Last photo:
Join Date: Dec 2003
Location: Canada
Age: 61
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I usaually use clevite 77 main and rod bearings.

Not Ford...definatly not Ford...
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-01-2006, 11:22 AM
King of my Man-cave.
Last photo:
Join Date: Nov 2003
Location: Michigan
Age: 58
Posts: 2,912
Wiki Edits: 0

Thanks: 6
Thanked 18 Times in 15 Posts
It's not how far a crank is turned that is important, it's how well it is turned. A properly turned .030"-.030" crank is better than a poorly turned .010"-.010".

Fully grooved mains are rarely used. Most mains are grooved in the top half with the bottom half not grooved. Some performance sets have the bottom have partially grooved. This helps if the rods can benefit from additional oiling.

Most brand-name bearings are of good quality. Some offer a tri-metal design while others use a newer, high-silicon content design. Some manufacturers offer both. High-performance bearings have there own pluses and minuses, depending on intended use. Do some research to find what is best for your applocation.

Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
the history of chevy v8's savman1 Hotrodders' Lounge 43 03-02-2012 06:57 PM
Building A 302 Chevy Scorpio Shaping Flow Hotrodding Basics 6 01-16-2007 05:55 AM
re-using rod and main bolts? Blob Engine 22 10-21-2006 08:07 AM
87 Chevy 350 TBI rod & main Clearance question Mustangsaly Engine 3 05-20-2006 04:18 PM
Rod and Main bearing ? 6426yy Engine 8 03-25-2006 06:26 PM

All times are GMT -6. The time now is 02:25 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.