For the Gen IV main bearings to they have the oil groove all the way around the bearing? Some one have some pics?
GEN IV main bearings
- Thread starter Yellow venom
- Start date
Anyone have some info??
I believe they do. My builder used them and as I recall he wanted them for better oiling.
Sorry, no pics.
Sorry, no pics.
Prof said:
For those bearings they are the ones out of an '08 then,right?
Yes sir.
Thank you for the info Prof. 
Another question,did anyone find out why there would be a need to increase oil pressure??
Another question,did anyone find out why there would be a need to increase oil pressure??
We did not increase oil pressure, but I do believe that the builder opened up the hole in the Gen IV main bearings...I will give you his phone number if you pm me...
perk_1405
Full Access Member
perk_1405 said:
So both pieces of the bearings are grooved with holes in them then?
Thanks for the pics:rock:
Yellow venom said:
Hi Joe,
Fully grooved mains are nothing new and have been used in various performance engine builds for decades.
Pressure (oil in this case) is created by pumping against some sort of resistance. With fully grooved mains, the overall resistance (pressure) is lowered a touch with more oil volume in, and entering the main bearings.
I wouldn't be worried about needing to increase pressure to compensate...
Ronnie
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ZCx said:
Yup yup.
rottenronnie said:
OK,Thanks Ron,How was the trip? I realize that the fully grooved bearings are not new,just trying to find some for our engine,it seems like all the manufacturers are using OEM bearings and just coating them and calling them their own,so the only ones out there are the Gen IV ones?
Yellow venom said:
The trip was great thanks. It was a real nice break from the LONG winter we have had. I met a great guy at the hotel in Nuevo Vallarta that has a crane business right in Sacramento. I am still planning to go there and should know more next week whether it looks feasible. If I can't make Sacramento, I want to go Mission for some passes to see if I can snag that high 11. It should be extremely close!
I wish we could have been more organized and rented the Sacramento track. 20 guys at $500 each would have secured it...oh well...
I am not going anywhere until Chris Jensen from DC Performance sends me a few sea-level tunes. He hasn't answered my last 3 emails???!!!
If you go with grooved mains, sure, use the Gen IV ones (costly though)..
I haven't heard of anyone (at my power level anyway) wiping out mains, but I guess Dodge had their reasons for using them.
3400 D.A. here this afternoon, it sure makes a big difference. I wish the track was open. That is if we even get one in this city!!
I couldn't find a decent rate on a shop, so I am building one, as the performance work is starting to get really busy again...
Ronnie
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perk_1405
Full Access Member
ZCx said:
thats right:rock:
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I haven't seen a bunch of engines run grooved lower bearing halves. The lower bearing is the one that takes all of the force of the power stroke. They usually keep the bottom ones solid so that they maintain the surface area and force the oil to try to escape through the side clearance between the bearing and the crank fillet radius. This forces oil retainment and prevents the oil from escaping into the lower grove which would allow the journal to contact the bearing. The "full" bearing lower really helps create the hydrodynamic oil wedge.
Did they raise the rev limit on the Gen IV motors? If they did, I bet this is why they increased the groove from 160 to 180 degrees. They are probably trying to maintain the proper hydraulic effects with higher rpm and potentially partially foamed oil.
Did they raise the rev limit on the Gen IV motors? If they did, I bet this is why they increased the groove from 160 to 180 degrees. They are probably trying to maintain the proper hydraulic effects with higher rpm and potentially partially foamed oil.
pokeytemplar
Full Access Member
I want 360 deg bearings for my Magnum build. The reduced width would make my contact surface equal to that of the Vipers. Also like the idea of keeping oil going to the rods and wrist pin at all times........ I wonder how difficult it would be to modify factory bearings and then just have them coated?
08 viper bearings
retail bout $120 each
thrust bearing bout $50 each
retail bout $120 each
thrust bearing bout $50 each
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