455 crankshaft
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455 crankshaft

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    Default 455 crankshaft

    How deep scratches/grooves are allowed on the rod and main journals on the crankshaft ? also not sure if it needs it, but if the crank needs to be turned down does it effect the life of the crankshaft without heat treating it afterwards?

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    Boat Nut sleekcrafter's Avatar
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    On the OLD's crankshafts, it's standard procedure to cut them, to reduce the bearing's surface speed on the mains.

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    Senior Member GAWnCA's Avatar
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    Scratches = Friction. It is my understanding that the Olds has an oiling problem as it is.
    Wags

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by GAWnCA View Post
    Scratches = Friction. It is my understanding that the Olds has an oiling problem as it is.
    Well, the Olds oils really good, so no problem there.

    It's more of a drain-back problem from the heads.

    It oils just fine till the pan runs out of oil to pump north, then, it gets expensive.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    The rest of us are being dragged along kicking and screaming.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by dgie View Post
    How deep scratches/grooves are allowed on the rod and main journals on the crankshaft ? also not sure if it needs it, but if the crank needs to be turned down does it effect the life of the crankshaft without heat treating it afterwards?
    Maybe post up a pic ? Old school rule ,if you can catch the scratch with a finger nail its way to much to ignore , might polish , needs to be assesd and mic'd by a pro to know .The more you turn it 10,20,30 the thicker the brg shell neccesary , poor heat transfer etc . Even though OE Olds cranks are getting scarce if yours wont "polish" standard look for a good STD core . Olds lower ends are way to touchy and too expensive to fix to risk a marginal piece. Check out some of the after "replacement" Cranks available to you too I think Eagle may have one now ? Tom

    heres an example ..http://spideraccessories.stores.yaho...104554260.html

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    NW Spectraholic Malcolm's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    On the OLD's crankshafts, it's standard procedure to cut them, to reduce the bearing's surface speed on the mains.
    Not really...

    An old trick I heard of was to rub a penny across the journal and if it leaves any copper behind it's bad. Kinda goes with the fingernail test.

    I've polished mine before with good results. You want them a thou or so loose anyway.
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    Senior Member Oldsquirt's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    Well, the Olds oils really good, so no problem there.

    It's more of a drain-back problem from the heads.

    It oils just fine till the pan runs out of oil to pump north, then, it gets expensive.

    You have the "cart before the horse" there Smokin. The Olds does have an oiling problem--insufficient oil to the rod bearings. This problem is magnified by the drainback issue. The primary purpose of the restrictors commonly used in the Olds is to bias more of the oil flow to the rod journals, the secondary effect is reduction of what goes up to cam and valve train. Had the GM engineers set the oiling system up with more flow to the rods, we would likely never heard of any "drainback" issues.

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    Senior Member Oldsquirt's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    On the OLD's crankshafts, it's standard procedure to cut them, to reduce the bearing's surface speed on the mains.
    If you are talking about cutting them down from the stock diameter of 2.5" down to, lets say, a big block Chevy's 2.2" diameter, then that would yield a substantial reduction in bearing speed. Simply cutting them to a normal undersize of -.010", -020" , -030", will have a very minimal effect on bearing speed.

    Quote Originally Posted by jetboatperformance View Post
    . Check out some of the after "replacement" Cranks available to you too I think Eagle may have one now ? Tom

    heres an example ..http://spideraccessories.stores.yaho...104554260.html
    Nice to see someone is finally making a replacement Olds crank. Now they need to do a forged one and a stroker. Almost makes me wish I still had a 455 to play with.

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    how about heat treating afterwards, is it necessary?
    Last edited by dgie; 11-27-2008 at 12:31 PM.

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    Smokin I just seen your post on the other thread on this.

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    I don't know where you are, what your finances are like, or what cut your crankshaft is currently at... but if it turns out you need a different one, the Eagles are around $500, I have a stock Olds cast crankshaft that could use a re-polish, it's already cut at 30/40, bearings are available for it from Summit, and you can have it if you need it plus shipping. Either way, good luck.

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    I'm baaaaack... hkunz's Avatar
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    I'm on my second turndown, now at 0.020" under. Not sure if I'd chance racing it, but it should be ok for sport boating. If I was gonna race I'd probably get an LS2 and start from there
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Oldsquirt View Post
    You have the "cart before the horse" there Smokin. The Olds does have an oiling problem--insufficient oil to the rod bearings. This problem is magnified by the drainback issue. The primary purpose of the restrictors commonly used in the Olds is to bias more of the oil flow to the rod journals, the secondary effect is reduction of what goes up to cam and valve train. Had the GM engineers set the oiling system up with more flow to the rods, we would likely never heard of any "drainback" issues.
    Ah, I was unaware of the rod-oiling issues, this is the first I have heard of it. Thx and duly noted.

    I suspect you maybe right on the bold line.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by dgie View Post
    how about heat treating afterwards, is it necessary?
    Besides, if you DO re-nitride it, I am 99% certain it will need straightened afterward. I am sure it will warp a bit in the process. Not a problem, just what happens.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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