03-08-2011 06:56 PM #1
Line Bore, or Line Hone
[B]Guys, got a guy who has an interesting situation, Has a BBC engine that somehow wound up missing the center main bearing?? How this would happen I have no clue. I have had them where all were missing, In any event would the correct fix be installing all 5 main caps from another engine and then Line bore or replacing the one and line hone?
I am not 100 percent but I always thought with a Line Bore you could set it where it would remove more from the slightly milled main caps so the crank would not wind up higher in the block as in Line Hone where it removes the same amount of stock from both ends??
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no ... yes... yes... and... no how is that
what pat said .. too many questions
|iv`e used up all my sick days at work .. can i call in dead ?|
if you have all the caps but one if you have alot of caps to pick thru you can get very close with not much work . gm caps from engine to engine can be way off on bore center line ..number 5 cap is a big deal as that has your thrust on it and if not dead on you will have no end play bind or thrust will only will run on one 1/2 of the thrust bearing. line boring can be set up to fix a engine with new caps or a heavy line bore from burnt up mains . honing can not move alot of metal like a cutting bit/line bore and will not put as much heat in to the part keeping it more to size .honing takes time as there cool down time to hold size stone break down... boring can not moving the crank as much or put it were you want to a point if the guys on the ball ... honing is fine for tune in were caps are are lined up and just need to be open up on size. some guys like hones as they say you can get the bearing to lay flatter and get more heat to transfer ....BUT guys with solid line bores with a good cutter bit can get very close if not the same finsh and have more control over tapper. drop .
Last edited by pat mccarthy; 03-08-2011 at 07:54 PM.
Wow--sounds like my afternoon--did 2 blocks this afternoon, one small block and a big block chev----on the big block--it seemed that maybe the 3 center caps weren't the ones that were off the block as the hone pattern was offset one way ---it did take another cut off the cap to get it so that we had a full contact pattern all the way around but also the crank centerline probably only moved up .003---
I have a lot of caps off old engines and I keep them for those missing one cap jobs---about any engine shop does the same.
LOL Pat, why am I not surprised, I think we might be safe on this one, But if the guys trades it for something cheep....... I will pack it with a bomber jacket to the frigid north...
thanks for being....you!
the post man sent me a love letter in the mail box .saying i have to pick some big box of iron i think he threw his back out trying to drop it off someing thing from FL
ROFL!!! You are the only guy I know that I can send something to the wrong address and the postman still knows, Oh yeah I know who gets this!!! true story!! ps as long as the love letter came from the postman and not the union rep we are okay!! lol