Hey folks,
I'm having trouble finding out which size bearings I need. First of all I have a 82mm cb perf. 2" chevy journal crank, the rod bearing journal is 2.000in, the main bearing journals are .020in over.
Now to the case, I know it has been align-bored. Here are the sizes of the main bearing bores:
#1-#3 2.595in
#4 2.004in
Any idea where I could get these bearings?
Also, the camshaft bearing sizes are 1.083in, I read this is normalso atleast that's one good thing..
Thanks, I want to finnaly get this shortblock together!!
bearing size dilema
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TxGhia
bearing size dilema
Ok, I think I know what I need (ask for), correct me if I'm wrong guys...
main bearings: case is bored 40 over and crank 20 over. (ny idea where to get these???)
rod bearings: 2in chevy
camshaft: standard vw
main bearings: case is bored 40 over and crank 20 over. (ny idea where to get these???)
rod bearings: 2in chevy
camshaft: standard vw
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Marc
- Moderator
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- Joined: Thu May 23, 2002 12:01 am
bearing size dilema
The standard VW-style part number for main bearings to fit a .040" over linebored case and .020" UNDER reground crank would be 111 198 485 STD if the thrust surface of the case is untouched. A bearing set with a 1.0mm thicker thrust flange would be marked 111 198 485 OST+1 under this system.
Best practice when a case needs the thrust surface machined is to only cut enough to provide a true surface, and then custom-cut the thrust flange of the bearing to match on a lathe.
The "Chev" rod bearings you need are actually for a Buick V6 (narrower than the Chev); Clevite 77 part number is CB610P (or CB610P-20 for .020" undersize, for example).
Aircooled.net should be able to fix you up, as should many other VW parts places like CBPerformance.
Your biggest concern is the present size and condition of the thrust and whether or not off-the-shelf bearings will work for you or if you'll need the case thrust-cut and/or the thrust bearing flange trimmed.
Best practice when a case needs the thrust surface machined is to only cut enough to provide a true surface, and then custom-cut the thrust flange of the bearing to match on a lathe.
The "Chev" rod bearings you need are actually for a Buick V6 (narrower than the Chev); Clevite 77 part number is CB610P (or CB610P-20 for .020" undersize, for example).
Aircooled.net should be able to fix you up, as should many other VW parts places like CBPerformance.
Your biggest concern is the present size and condition of the thrust and whether or not off-the-shelf bearings will work for you or if you'll need the case thrust-cut and/or the thrust bearing flange trimmed.
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TxGhia
bearing size dilema
Thanks alot for the reply!
Is there any way to measure the thrust bearing flange? Or any other way to find out exactly what I'd need?
I just thought I read on aircooled.net that john doesn't sell bearings for align bored cases..
Is there any way to measure the thrust bearing flange? Or any other way to find out exactly what I'd need?
I just thought I read on aircooled.net that john doesn't sell bearings for align bored cases..
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Marc
- Moderator
- Posts: 23741
- Joined: Thu May 23, 2002 12:01 am
bearing size dilema
Sorry, I only meant that aircooled.net lists the Buick rod bearings. Actually you shouldn't have too much trouble buying those through your FLAPS or machine shop.
Check the thrust surface of the case for a machined step that would indicate that it's been cut before, and feel for any lip created by the bearing pounding into it - if you can catch your fingernail on it it's too much and needs machining. I don't recall the standard dimension for the thrust saddle width, I'll see if I can look it up this evening if nobody else has it.
Look at the old bearing for a clue - on a standard-thrust bearing both flanges are about the same thickness.
Check the thrust surface of the case for a machined step that would indicate that it's been cut before, and feel for any lip created by the bearing pounding into it - if you can catch your fingernail on it it's too much and needs machining. I don't recall the standard dimension for the thrust saddle width, I'll see if I can look it up this evening if nobody else has it.
Look at the old bearing for a clue - on a standard-thrust bearing both flanges are about the same thickness.
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TxGhia
bearing size dilema
I wish I had an old bearing, but I bought the case right after it was machined at Rimco.
I'm a real newbie though, so where would this machined step/thrust saddle be?
I'm a real newbie though, so where would this machined step/thrust saddle be?