rod bearing information - Team Camaro Tech
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post #1 of 10 (permalink) Old Mar 21st, 08, 08:12 AM Thread Starter
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rod bearing information

Freshing up a Vortec 5.7 L-31 motor.
It had a spun bearing on # 3 rod.
Crank will clean up with a turning,not sure how much it will take but it will go to the machine shop next week.

I have been looking at different types of rod and main bearings.

The question is in reference to Clevite 77 "h" bearings.
They say for med to high rpm engines.
Does this mean they will not work in a street engine that will see 2500 to 3500 for most of its life.

Does more money always mean better because they cost quite a bit more that other bearings available.

Thanks for the help
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post #2 of 10 (permalink) Old Mar 21st, 08, 08:42 AM
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Re: rod bearing information

The H series rod bearings have a larger chamfer on the end that is next to the crank fillet.
Many high end aftermarket cranks have a larger than nomal fillet radius to increase strenth. Unless your crank has "non standard" machining, you don't need H series bearings.





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post #3 of 10 (permalink) Old Mar 21st, 08, 08:49 AM Thread Starter
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Re: rod bearing information

a larger chamfer warrants that much more money??
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post #4 of 10 (permalink) Old Mar 21st, 08, 11:06 AM
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Re: rod bearing information

An "H" bearing is also hardened in order to withstand higher power levels. A soft normal bearing will fatigue crack or pit when exposed to more force than design levels. At what level that occurs...?

An "H" bearing is not as forgiving in 1 aspect as a softer conventional bearing probably but that's just my opinion. Along with the hardness gained I would expect to lose some "embedability"(ease of taking a hit of crap without wadding up and siezing) because they aren't soft

Yes they are higher price. Are you getting price from Summit? They have decided to not have the normal "H" on their website and have the coated "H" instead. And it is very costly. You have to input the Clevite vendor# then the Clevite "H" # to get the regular H bearing. I think Jegs is the other way around and doesn't show the coated bearing unless you put in the part number. Coated is about 100 bux higher than hardened. Hardened is about triple regular if I remember right. soft25-hard75-coated175? ish. Just mains. 1 coated rod bearing costs about what a set of 8 regulars does. I know I bought rings and bearings to play with a 305 for less than a set of hardened mains. $72 bux to put new rings and bearings in a 305 with pretty holes, yeah sure wtf

Here's what coated H looks like. All my pics of regular H are worn from running lube free unintentionally. You lose a couple tenthou clearance with coated.

The H kinda looks like *** when new. The hardening process discolors them pitiful and you have the overwhelming desire to make Lurch noises when you look at them. The Tri Armour coated H is a beautiful bearing. The ugly brown fluid is EP-3 lube for threads.
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post #5 of 10 (permalink) Old Mar 21st, 08, 05:07 PM Thread Starter
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Re: rod bearing information

77wolf10.85, was that motor for the street or strip?
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post #6 of 10 (permalink) Old Mar 21st, 08, 07:28 PM
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Re: rod bearing information

Strip, but it will still do some street.

Tim Smith
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post #7 of 10 (permalink) Old Mar 21st, 08, 07:54 PM Thread Starter
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Re: rod bearing information

would you use "H" bearings in a street motor?
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post #8 of 10 (permalink) Old Mar 21st, 08, 07:59 PM
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Re: rod bearing information

Not unless I was running a good forged crank.

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post #9 of 10 (permalink) Old Mar 21st, 08, 08:01 PM Thread Starter
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Re: rod bearing information

thanks for the help, just a stock crank so I will run the standard softer bearing
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post #10 of 10 (permalink) Old Mar 21st, 08, 08:03 PM
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Re: rod bearing information

They do real good.

Tim Smith
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