What is the advantage/dissadvantage to using full floating rod bearings on a 49 to 53 Flathead V8. Will be running a Mercury 4 inch crank.
Advantage: half the bearing speed on each surface. Disadvantage: cost more and harder to install correctly.
In order to use floating bearings crank needs to be reground smaller and offset for a 4 1/8th stroke.
They are on the crankshaft now. I dont understand what you're saying. They are 030" under rod bearings on an 0 30" crank.
The floaters will work with the Mercury crank. But,you must use '46-'48 Ford rods that are machined for the full floating bearings.
I don't know, but I would guess less drag and less friction due to more float of oil between contacting surfaces. Ok, found the answer: Open and scroll down to post by Bruce Lancaster (RIP). Wish he was still with us. https://www.jalopyjournal.com/forum/threads/what-do-you-know-about-full-floating-bearings.64318/
Learned something new today, well actually two times today. Never heard of full floating crank bearings, or at least in "normal" cars/trucks; piston pins yes. I know some motorcycles, and some high end European cars, use roller/sleeve bearings, but those cranks have to be dis***embled/***emble to do the bearings. The other thing today, why in the h*ll did Ford come up with a negative post battery clamp that tightens/loosens with a "slide" and opposed "wedge" tighteners. You know what I'm talking about, if you know what I'm talking about; if you don't, head to a wrecking yard an see for yourself. The negative battery cable is apparently part of an entire harness that has to be swapped out. And this was all because of a body shop that busted the negative battery post loose trying to remove the cable clamp; it's been almost 3 years, so not much I could probably get them to do. This is a nationwide firm that sounds like they should be making baby food. I took it all apart, clean it up, drilled a couple of holes, added a bolt and nut (like it should be, like the positive post is), and now it's actually serviceable. I am Butch/56sedandelivery.
I think the misunderstanding is yours. The question was which end of the rod was being discussed, the crankshaft (end) or the (piston) pin end?
Sorry about my ignorance in this matter, The connecting rod that goes between the crank and piston to my knowlege pivots at each end, the piston side has a pin that is either pressed into the rod and floats in the pin bore OR the pin is fitted on both rod and piston held in place by retainers--- hence the term "full floating" . The crankshaft end of the rod is clearenced for oil both on the cir***france and side and that allows the rod to automaticly float on the crank journal, so what extra "float" do you need if you dont mind me asking? Rods have bearings for the crank side and some applications they "BUSH" the pin side because there is no 360* rotation to keep a bearing from pounding out
Main bearing, rod bearings, it really does't matter, you're not going to see it on an American made automotive engine. They tend to be "smaller" engines, like motorcycles, with cranks that "come apart" to install/remove the bearings. I think you know what I meant anyways. Here's your knife back. I am Butch/56sedandelivery.
I tore apart a 59A that had them on the crank, someday I'll pull the pistons off the rod to see, but I don't think floaters were used on the small end, were they? I'll go look through Bruce's reply.
46-8 Ford Flatheads had a common bearing shell that both rods on a crank pin pivoted on the O.D. of the shell. The bearing was not locked in the rod and was pressure oiled on both the O.D. and the I.D.
No I believe the mistake is yours. Show me a Flathead that had bearings in the small end of the crank. There's such a thing as full floating wrist pins, but bearings......No
Not my error, I never made any claims as to bearings per se, only pointing out that it appears you misunderstood what the other fellow was asking. I can readily admit my mistakes, and have here and elsewhere.....can or do you?
You need to go back and read again !!! And then tell me about bearings of any kind, on the small end of a connecting rod.
i have a set of rods out of my 59ab as i used the merc rods that came with the crank. cheap if you need em
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