Re: camshaft wear
 

Also, Joe Gibbs has a 20W/50 racing dino oil that is loaded with the good stuff for lots less $ than their synthetics. --- Jer

Re: camshaft wear
 

Thanks.

Re: camshaft wear
 

To answer the initial question or post, yes I lost a cam lobe with an Ultradyne after about 125 hrs. I used Mobil 1, 15-40. This was a special problem with Ultradyne Cams for a while.

My question on the racing oils, are do they offer the qualites needed for extended oil change intervals? Are they high detergent so you don't have to change them every 5-10 hrs of operation? Oil change intervals are not an issue with racing engines, but for recreational performace boaters it is. Infact, this post is scaring me because I do not want to wipe out another flat tappet cam because of oil issues, but I don't want to have to change it every other time I go out either. Somebody help me out here!

Re: camshaft wear
 

500 miles at or above 9000 rpm is probably more abuse than most of us recreational boating guys submit our engines to in a given year. But if you think that you drive further and harder than that, you should change it once in mid-season. --- Jer

Re: camshaft wear
 

I'm talking about dirt and ability to deal with moisture. All the things that oils for consumer usage is designed to do. Of coarse I don't subject my boat to the equivalent of 500 miles at 9000 RPM smart ass.

Re: camshaft wear
 

I really wasn't trying to be "smart". I probably DO have a customer or two who will subject his equipment to comparible abuse in one season. Getting your oil temps up to 212* F should vaporize any moisture, (You should do this with any oil) and proper filtering should do the rest. I change my filters (I use a dual filter system) midway through the season and just top off. --- Jer

Re: camshaft wear
 

Thanks for the input. I bought the boat from the orig. owner he lost a cam in less than a year got it warr. had engine rebuilt. I bought it with two hours on it and it lived for ten more hours this time. Completely wiped out one lobe and was working on four others.

Re: camshaft wear
 

Go back to RMBuilder's post #8 here. That first 2 hrs. break-in time on a flat tap cam is SO critical! --- Jer

Re: camshaft wear
 

I've heard 2 things on various auto/engine forums.
1) Bad batch of cores from china. Just poor grade material.
2) Comp cams recently cam out with a statement blaming changes in oil formulation. They reccomend Rotella oil for break in.
See: http://www.compcams.com/information/...yID=1985582846

Re: camshaft wear
 

Since I have an engine apart and it needs a new cam, I will bite the bullet and go roller.