Needle Roller Cam Bearings: what are the downsides?
Needle Roller Cam Bearings: what are the downsides? I was looking at these bearings from Comp Cams:
http://www.compperformancegroupstore...gory_Code=BRNG
The pros to these bearings that I've found so far:
1. They're happy with splash oiling. Because they don't have oiling holes, they provide the same benefits of running oil restrictors with standard cam bearings without the "risk."
2. They lower valvetrain friction.
3. Don't have to worry about ever spinning one.
Maybe there are more pros, but as of yet that's all I've been able to find. Now I'm curious about the "cons." So far, additional machining costs to the block to make them fit are all I've seen. What are some other reasons to NOT run these bearings?
http://www.compperformancegroupstore...gory_Code=BRNG
The pros to these bearings that I've found so far:
1. They're happy with splash oiling. Because they don't have oiling holes, they provide the same benefits of running oil restrictors with standard cam bearings without the "risk."
2. They lower valvetrain friction.
3. Don't have to worry about ever spinning one.
Maybe there are more pros, but as of yet that's all I've been able to find. Now I'm curious about the "cons." So far, additional machining costs to the block to make them fit are all I've seen. What are some other reasons to NOT run these bearings?
From what I've gathered, the cam tunnel in the block needs to be line bored for these to fit. As far as getting a cam with the correct size journals: not sure how major of an issue that is. Maybe one of the cam gurus here can comment on that.
Originally Posted by Ed Wright
You don't need/want those.
Anyone else?
Now I could have seen it if you asked Ed WHY, heck I would like too know why he said that. But too me it sounds like you do not value his input and if that is the case there is no helping you, Ed and I have disagreed in the past but I always value his comments because I know he has a lot of experiance not just time believing whatever marketing BS is flung at him like most here do.
Trending Topics
I thought that the title to the thread "what are the downsides" in addition to asking in my first post "what are some other reasons to NOT run these bearings" pretty much covered the "why" question, but I guess not.
Okay Ed, so why should I not run these bearings?
Okay Ed, so why should I not run these bearings?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
I'll jump on that. There are only about a MILLION other things you could do that would give a larger improvement than roller cam bearings. The guys that use those only use them because they are running ridiculous spring pressures (300+ lb seat) and can't make babbit bearings last.
Originally Posted by thesoundandthefury
I thought that the title to the thread "what are the downsides" in addition to asking in my first post "what are some other reasons to NOT run these bearings" pretty much covered the "why" question, but I guess not.
Okay Ed, so why should I not run these bearings?
Okay Ed, so why should I not run these bearings?
I appologize if I offended you. I didn't mean to sound condesending. Down sides: Lots of money for VERY little gain, you probably couldn't measure the power increase roller cam bearings woulld give you. Those are intended for large diameter cam cores which prevent cam twisting with extrememly high (Like 1") valve lifts, extreme spring pressures, and extreme RPM. None of which you would likely see with an LT1. Many engine builders are going back to babbit cam bearings, even with large diameter cam cores. I have never heard of anybody spinning a babbit cam bearing, but I guess if you did enough things wong enough, anything is possible.
I hope you will accept my applogy, Ed
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
Originally Posted by Ed Wright
I have never heard of anybody spinning a babbit cam bearing, but I guess if you did enough things wong enough, anything is possible.
