Which main/rod bearings?

SmokeShow

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Nov 30, 2006
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Subscribing. Interesting topic! ;)


How is the extra clearance achieved? Main bore larger? Crank mains honed slightly smaller? Or what? Guessing extra material taken out of caps & block for more clearance? So are the bearings a slightly larger diam?

Henry's comment about them, H & HX, being the same is throwing me a bit. Just want to understand. :)
 
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S Phinney

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Aug 15, 2008
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He meant that the H and HX bearings are the same bearing other than the HX being a bearing with extra clearance built into it. They both are hardened bearing. Bearing clearances can be influenced by the line hone diameters being varied or using X type bearings or through the polishing process of the crank etc...
 

delong_1

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Mine has the hx series in it. The standards didn't have quite enough clearance for my liking. So if anyone wants some h series main and rod bearings that I had coated for cheap let me know
 

delong_1

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Dec 5, 2008
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I will have to look at my notes

I would sell the rods and mains for $600 shipped almost half of that is to cover the coating
 

blk smoke lb7

<-----Lots of green $
Nov 8, 2010
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belvidere,ill
James theres a company out of Houston i believe they are called polymer Dynamics that does the main and rod bearing coating .I have a friend from Ok that is down there rite shooting a video of it for you tube and they are GIVING him 2 complete motor rebuild kit forged pistons and so on but they showed a cummins bearing that had 300k on it and it was trashed and they showed a coated bearing with 1 million miles on it that was like new.I had my pistons coated but didnt realize they did the bearing also or i would have had mine done.
http://www.youtube.com/user/TheDieselStop
 

DIGGLER

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Feb 6, 2011
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James theres a company out of Houston i believe they are called polymer Dynamics that does the main and rod bearing coating .I have a friend from Ok that is down there rite shooting a video of it for you tube and they are GIVING him 2 complete motor rebuild kit forged pistons and so on but they showed a cummins bearing that had 300k on it and it was trashed and they showed a coated bearing with 1 million miles on it that was like new.I had my pistons coated but didnt realize they did the bearing also or i would have had mine done.
http://www.youtube.com/user/TheDieselStop
i can show you some 255k mile dmax bearings that look brand new... matter of fact, i have 2 other blocks with unknown mileage that have great looking bearings in them. imo, if you have the clearances right for what oil/load you will be running, the crank should never touch the bearings and cause wear/damage. if you will be making big power, you will need more clearance and a heavier oil.
 

blk smoke lb7

<-----Lots of green $
Nov 8, 2010
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belvidere,ill
i can show you some 255k mile dmax bearings that look brand new... matter of fact, i have 2 other blocks with unknown mileage that have great looking bearings in them. imo, if you have the clearances right for what oil/load you will be running, the crank should never touch the bearings and cause wear/damage. if you will be making big power, you will need more clearance and a heavier oil.
I totally agree but if the coating is a good thing it doesnt hurt to go that extra mile either. IMO
 

ripmf666

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Sep 20, 2006
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I have been running the P series in mine since rebuild @ 30,500 miles and now I'm at 84,500 in 3 years. I just always keep clean oil in the old girl change it around 3,500 no more then 4,000 miles with Mobile Delvac 1300 series 15-40.
 

SmokeShow

Well-known member
Nov 30, 2006
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Delvac is great oil. Probably one of the best oils on the market, and definitely the best in the mainstream market.


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Is that your opinion or do you have some supporting info that shows/says that? Just wondering.


I'll be running schaeffers oil in mine. Whichever kind they recommend. :)