Are Comp Cams Trunions Worth it?
03-22-2013, 08:21 PM
#65
Here is a direct quote from Richard at WCCH himself that I got in an email earlier tonight.
"Those people who say that the bushings are a step back obviously don't understand the loads imparted on the lower portion of the trunion. Needle and roller bearings work best when rotating a complete 360º. They do not do so well with limited ranges of movement. The bushings offer far more load bearing surface than the needle bearings which is the primary reason why they are more reliable. Old school? Yep! But it still works today. We have never had a single CHE rocker arm failure for any reason. That's the main reason why we sell them. Spintron testing has proven the CHE arms to be more stable at high engine speeds whena compared to oem and other aftermarket shaft rocker setups."
Sending my rockers out ASAP!!
"Those people who say that the bushings are a step back obviously don't understand the loads imparted on the lower portion of the trunion. Needle and roller bearings work best when rotating a complete 360º. They do not do so well with limited ranges of movement. The bushings offer far more load bearing surface than the needle bearings which is the primary reason why they are more reliable. Old school? Yep! But it still works today. We have never had a single CHE rocker arm failure for any reason. That's the main reason why we sell them. Spintron testing has proven the CHE arms to be more stable at high engine speeds whena compared to oem and other aftermarket shaft rocker setups."
Sending my rockers out ASAP!!
04-10-2013, 08:44 AM
#68
Talked to Richard about this. He has the bushing installed in used cores for $520. It's $642.72 in new rockers. Heinously expensive for what it is.
With that said, he said he's been selling a lot of the CHE rockers because of Comp Trunion failures the last few weeks. Same goes for Yella Terra rockers breaking. Don't know if it was the latest revision, but that makes me leery as hell of running an aluminum rocker in any kind of street engine. At this point, I'd be inclined to either run stock new rockers or the CHE...
With that said, he said he's been selling a lot of the CHE rockers because of Comp Trunion failures the last few weeks. Same goes for Yella Terra rockers breaking. Don't know if it was the latest revision, but that makes me leery as hell of running an aluminum rocker in any kind of street engine. At this point, I'd be inclined to either run stock new rockers or the CHE...
04-10-2013, 11:34 AM
#69
I still just think the price for the CHE bushings is nuts. I'm sure his profit margin is insane!! Also, it's still a step backwards, I don't care what he says, he's trying to sell his product afterall. 8 tracks still work today too.
If there was no benefit to the bearings there is no way GM would have spent the $$ to design and go with the bearings in 97. If it was proven to be so bad they would have went back to the bushing setup. And if the bushing setup was so great more aftermarket companies would be offering them.
All that said, I'm sure they are more stable than the comp or stock but for that money I would put it toward a quality set of aftermarket rollers, not toward bushings.
To each is own though, I hope it works out for whoever gets them!
If there was no benefit to the bearings there is no way GM would have spent the $$ to design and go with the bearings in 97. If it was proven to be so bad they would have went back to the bushing setup. And if the bushing setup was so great more aftermarket companies would be offering them.
All that said, I'm sure they are more stable than the comp or stock but for that money I would put it toward a quality set of aftermarket rollers, not toward bushings.
To each is own though, I hope it works out for whoever gets them!
04-10-2013, 12:21 PM
#71
I still just think the price for the CHE bushings is nuts. I'm sure his profit margin is insane!! Also, it's still a step backwards, I don't care what he says, he's trying to sell his product afterall. 8 tracks still work today too.
If there was no benefit to the bearings there is no way GM would have spent the $$ to design and go with the bearings in 97. If it was proven to be so bad they would have went back to the bushing setup. And if the bushing setup was so great more aftermarket companies would be offering them.
All that said, I'm sure they are more stable than the comp or stock but for that money I would put it toward a quality set of aftermarket rollers, not toward bushings.
To each is own though, I hope it works out for whoever gets them!
If there was no benefit to the bearings there is no way GM would have spent the $$ to design and go with the bearings in 97. If it was proven to be so bad they would have went back to the bushing setup. And if the bushing setup was so great more aftermarket companies would be offering them.
All that said, I'm sure they are more stable than the comp or stock but for that money I would put it toward a quality set of aftermarket rollers, not toward bushings.
To each is own though, I hope it works out for whoever gets them!
There are better solutions, but you have to ask yourself the same question they did during the design process: are the performance gains worth the costs associated with it? For a mass produced engine, their answer was probably no.
04-10-2013, 01:32 PM
#73
http://www.uni.edu/~rao/Md-20%20Ball...20bearings.pdf
Interesting reading on different types of bearings. Look at slide #11. Basically failure curve for bearings. See the left side? That's infant mortality.
So, I say, get the comp cams upgrade, monitor them for a short period, and if they run okay, just forget them. People puke stock needle bearings all the time, for the most part, I have not heard of any damage being done to the engine.
Interesting reading on different types of bearings. Look at slide #11. Basically failure curve for bearings. See the left side? That's infant mortality.
So, I say, get the comp cams upgrade, monitor them for a short period, and if they run okay, just forget them. People puke stock needle bearings all the time, for the most part, I have not heard of any damage being done to the engine.
