Machined crank confusion.
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
thank you man. So just to be clear what bearings do I need to add .001 to the mains ? Undersize oversized I don’t understand the nomenclature. I also need to reduce my Rod bearing clearance by at least .001.
Well if the crank mics out to 2.099 on the rods and 2.558 you should be fine with Clevite P-Series standard bearings. What are your measurements for the rod and main bores? Having 0.025-0.030 clearance for an iron block build ran on 5W30 would be ideal IMO.
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
So I had my gen 4 rods fitted with arp bolts and they honed them to true them. I have not measured the id of my rods with a snap gauge or anything I just installed my std bearing in the rods torqued them then measure with my bore gauge zeroed to the micrometer reading from the crank and was getting .0035 on the rods is t that too much?
Have you taken measurements at different locations of the rod bore to make sure your gettting a consistent number? What bearings are you using? 0.0035 is on the loose side of things but I also don't think that's a bad thing either it just means you can run a thicker oil.
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
Have you taken measurements at different locations of the rod bore to make sure your gettting a consistent number? What bearings are you using? 0.0035 is on the loose side of things but I also don't think that's a bad thing either it just means you can run a thicker oil.
these are the bearings
Last edited by Ben16SS; Jan 29, 2023 at 04:46 PM.
Yes, you are correct. This is a LONG way from 2.0775"! 2.099" diameter should give only .001" clearance, which is too tight. OP-Where did the .0035" clearance # come from?
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
i measured the Rod journal locked my mic the. Zeroed my bore gauge to the mic and checked my clearance on the Rod. And yeah I was definitely reading the mic wrong at first.
I was thinking that after you pass one of the .025 lines you then add the next number on the thimble at .00xx and add them. So I was starting with 2.075 + .0024 then + .0001 for the line up of the finest graduation. Should I be adding .024 not .0024 is that what I’m goofing up?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
Last edited by grinder11; Jan 30, 2023 at 08:50 AM.
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
Reading 1 10,000" (100 millionths!!) is extremely difficult!! I was a T&D maker for over 40 years, and did this a LOT. OP-I don't care how good you get at using a mic, when you start trying to read "tenths" on a mic, best you can hope for is plus/minus one tenth, which is pretty damn accurate, except for aerospace, whoch is on another planet, literally!!
I'm assuming you mean .0025-.0030 clearance, NOT .025-.030!!! This is where confusion enters the picture for inexperienced builders......
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 74
Likes: 8
Joined: Apr 2006
Posts: 3,894
Likes: 1,139
From: Grand Rapids, Michigan
These bearings should work for your rods. They're designed for cracked cap rods that have been honed .002 over: https://www.competitionproducts.com/.../#.Y9fdL3bMLrc
