max turning a crank?

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Re: max turning a crank?

Post  Paul Kane on July 18th 2013, 8:04 pm

Lem Evans wrote:
Paul Kane wrote:
Lem Evans wrote: 
Seems everybody is 'comfortable' turning a crankshaft .060" under. So, who makes a -.060" main bearing for the bbf? If it is available, is it a race grade bearing?
The word "race" on the side of the bearing box does not a race bearing make. Wink 

Nor does necesssarily its construction. By that, I mean that a hard steel-backed "race" bearing with a micro-thin babbit layer is not always the preferred, go-to engine bearing for a high performance engine build. Sometimes the very thick babbit bearing is the builder's choice, and with good reason. It depends on the engine program, application, etc. So yeah, 0.060" bearings are available for big hp engines, just not in every manner of bearing costruction as can be found in lesser undersizes. Cool 

Paul

One may do what they what to but, aint no way I'm gonna put a station wagon bearing in a racing engine.


Heh, "station wagon bearing." There's that labeling again.

If your particular builds are among those types of builds where a hard-faced bearing is the preferred option, then yes, your engine bearing undersizes are indeed more limited than in such high performance builds where a dead-soft bearing is the preferred option.

By the way, conversely speaking: hard-faced "racing" bearings work in station wagons too, ya know. Very Happy 

Paul
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Re: max turning a crank?

Post  Lem Evans on July 18th 2013, 8:27 pm

1] Hard-faced would be your girlfriend's name.Smile 

2] I am well aware of the soft 'micro' rod bearing. My 1st bbf ford stroker was a 478" w/mopar aluminium rods...it had the high embedment rod bearings and I ran it 2 years on the river.

3] Seems things on the 'net' are more about what one could do and not about what one should do...i.m.o.

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Re: max turning a crank?

Post  Paul Kane on July 20th 2013, 12:56 pm

Lem Evans wrote:1] Hard-faced would be your girlfriend's name.Smile 

2] I am well aware of the soft 'micro' rod bearing. My 1st bbf ford stroker was a 478" w/mopar aluminium rods...it had the high embedment rod bearings and I ran it 2 years on the river.

3] Seems things on the 'net' are more about what one could do and not about what one should do...i.m.o.
1) Hey Now! Razz   Hard-faced girlfriend??? You've met my last girlfriend and I'm pretty sure I've shown you some of her modeling pics in those magazines she did work for.

2) Yes, high-embedment rod bearings can be an important part of some high performance engines, but certainly not all.

3) And yes, my comments are generalized and assume the actual builder understands all bearing options and selecting a proper engine bearing for a given engine build; my input here regarding bearing choice(s) is certainly not part of all engine builds and definitely not a recommendation that is applicable to any specific build related to this thread. One type does not fit all--I assumed we had veered from the specific/original topic of this thread.

Paul

P.S.: Me & Lady Lisa had dinner a few weeks ago. She is doing fine (thought you'd like to know). Smile

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