[zippy]

So latest update. I take my crank and the bearings to the shop who originally did the bottom end. Told him, and showed him that the counterweights will have to be shaved down too. The crank was made with 455 journals, but 400 thrust spacing. So the crank will have to be balanced after counterweight shaving. He tells me, nope It will all be good. Don't worry. So fast fwd 2 wks later, to today. He calls me and is like Ummm Your bearings are wrong. They won't fit the counterweights. YEAH, I TOLD you that. They are the right bearings for 455. Crank was made wrong and you should have sent it back the first time you did it instead of grinding my thrust bearings to steel. Now you gona have to re balance it too, Like I said the first damn time..... I am just pissed and need to vent. It's like no one these days can do their job's right. Even in my career. Drywallers and painters always taking shortcuts, and messing up my electrical costing me hours and costing the client even more money. Just fed up

[PAUL K]

That is frustrating and happens too often nowadays. We need to make "made in America" mean something, like it has in the past.

[Sirrotica]

Originally Posted by PAUL K

That is frustrating and happens too often nowadays. We need to make "made in America" mean something, like it has in the past.

If you wouldn't sign your name to your work, then you have no business doing the work.

[RAIV55]

Originally Posted by hurryinhoosier62

HUH? The grinding wheel ALWAYS clears the counterweights on a crank journal. There are two methods of grinding the thrust surface on a crankshaft: plunge cut, which is the most problematic, and a gradual feeding of the grinding wheel into the thrust surfaces. Either method clears the counterweights.

The counterweights can't be closer together than the thrust flanges.

[Stan Weiss]

Originally Posted by TedRamAirII

I think some MO and DZ 302 Chevy engines had floating pins, but no bushings?

Many years ago I ran a SBC where I floated the wrist pins in the rod with no bushing. Others have also done it as well.

Steel-on-steel unbushed rod small ends
https://www.speed-talk.com/forum/vie...b67ea817b9d3a5

Stan

[25stevem]

If a mod like this is done thru the number 4 main web and both of the faces of the thrust bearing then there is 100% no problem with running a bearing cut down as the OP pulled out of his motor.

[zippy]

Originally Posted by 25stevem

If a mod like this is done thru the number 4 main web and both of the faces of the thrust bearing then there is 100% no problem with running a bearing cut down as the OP pulled out of his motor.

Ya, while that would probably work fine in lubricating steel on steel thrust. When I paid for a properly built 455 bottom end and forged crank, I want a PROPERLY built one. Not one that I will have to grind any future thrust bearings down to fit a mis manufactured crank.

[hurryinhoosier62]

Originally Posted by RAIV55

The counterweights can't be closer together than the thrust flanges.

I’ve never seen a crank where they were, even on fully counter weighted cranks. You notice things like that when you grind cranks for a living like I did.

[hurryinhoosier62]

Originally Posted by 25stevem

If a mod like this is done thru the number 4 main web and both of the faces of the thrust bearing then there is 100% no problem with running a bearing cut down as the OP pulled out of his motor.

Excellent point, Steve. This is the same mod folks used for years before the forged 3” main 4.00. 4.21 stroke cranks became available.

[hurryinhoosier62]

Originally Posted by Stan Weiss

Many years ago I ran a SBC where I floated the wrist pins in the rod with no bushing. Others have also done it as well.

Steel-on-steel unbushed rod small ends
https://www.speed-talk.com/forum/vie...b67ea817b9d3a5

Stan

Stan, I have personally machined around 6,000 automotive/truck gas and Diesel engines along with several hundred aircraft recip engines. I have NEVER seen an application where steel on steel floating pins were EVER utilized. This includes both V-1650 Merlins & V-1710 Allisons, R-2800 Pratts, R-3350 Wrights, R-1820 Wrights, R-1340 Pratts and R-985 Pratts along with other “one off” engines. I’m not saying it can be done for a specific application and reason , but I’ve never seen it.

[25stevem]

Why do we keep leaving the needed oil film out of what we are talking about here?

It should never be steel on steel or steel on Babbitt or steel on Aluminum or Aluminum on cast iron.