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Old 06-15-2012, 03:09 PM
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standard or undersize rod/main bearing???

I'm re-ringing a sbc400. To keep it short and simple, I'm running a high volume oil pump. So do I go with standard size, or .001??? It's the 1st time the engines has been taken apart. No wear.

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Old 06-15-2012, 03:28 PM
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Throw away the H-V pump.. Then have the crank checked and order appropriate bearings.

Many people think the crank shows "no wear". When in reality it is way off. Not round and/or tapered in the crankpins. This is the backbone of the engine. No place to guess. unless you have deep pockets and like to rebuild from mistakes..
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Old 06-15-2012, 03:38 PM
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Run a stardard volume pump, HV pumps will rob you of about 10 HP per say, HV are used when running bigger bearing clearences larger than spec.. As mention, have the crank mic for trueness and size, undercutting the mains and rod journals not always a bad thing as it reduces bearing speed, heat and friction, 10-20 under not a big deal, just make sure you get the correct oversize bearings when you have the crank refinished as I hope you would
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Old 06-15-2012, 03:52 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Throw away the H-V pump.. Then have the crank checked and order appropriate bearings.

Many people think the crank shows "no wear". When in reality it is way off. Not round and/or tapered in the crankpins. This is the backbone of the engine. No place to guess. unless you have deep pockets and like to rebuild from mistakes..

X2 on what Bob said, do it right the first time.



Cole
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Old 06-15-2012, 04:28 PM
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Originally Posted by eloc431962
X2 on what Bob said, do it right the first time.



Cole
Where have you been Cole, it's been lonely here without you.
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Old 06-16-2012, 07:13 AM
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oil pump

HV oil pumps are for 4 wheel drives with low idle speeeds. On a high rpm engine you will suck the sump dry. You can polish a crank. You don't have to turn it unless you've spun a bearing. I just mike the crank and use plastigage for extra insurance.
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