Dances with Shrapnel
Don't misunderstand me - I am not suggesting pumping more oil into the crank case and I am not encouraging pressurized oil to the cam. What I am saying is that since the oil is already draining down the pushrod tunnels from the rockers - then you might as well direct it to the center of the cam lobes. The stock setup drains it down the chamfered side/corner of the lifters and sort of misses the lobe center.
This is not adding to the total amount of oil - just re positioning where the rocker oil drains to. Its a feature of the bronze tappet blocks and radiused BSA lifters. Ken Canaga turned me on to this setup when I was racing. The factory Norton dirt track racers were doing it. Ken showed/told me about the longevity of radius lifter cams compared to flat tappet cams and I was impressed. Below is a photo after a 5000 mile inspection. You can see some dark stain on the left lobe tip but everything else is clean. There is 40,000 miles on it now but no new photos.
Surely you don't object to oil dripping onto onto the centers of the cam lobes instead of to the sides.
No, Royal Purple
Mobil 1?
Which Megacycle option did you go for?So Stock Cams are not immune to wear either, my 74 running close to Fullautos mileage on his PW3 when I needed the rebuild. I sent my old cam core plus some others a few years back to comnoz and got a couple of re-welded cams in 12 and 12a grinds. I haven't got a chance to install them yet. If my 74 gets a refresh, then something will go back in. I will post pics of my Megacycle cam and I will post you mileage I've got 65000+ and counting.
Cheers,
Thomas
Which Megacycle option did you go for?
oldmikew,
I had a 560-NR which would be the one closest to stock performance with flat lifters.
Thomas
I guess I don't understand what you are waiting for.
Whatever AN has to say about the issue, or the test results, or anything else, you're gonna use a new one anyhow, yes?
Fullauto
If you removed cams and followers from a new Hyundai and had them both coated, and they subsequently failed, Hyundai would throw any claims out because you would have deliberately altered the original production specification of the items.
I will be very surprised if AN do not take a similar view.
Your problem is not one of lubrication, but of material incompatibility, and you should be asking the firm who did the coatings for answers
Ken, you are proceeding with a hard faced Webcam in your rebuild. So, the findings of what was wrong with your chilled iron PW3 cam are likely to be largely irrelevant to your future set up.
I don’t think anyone is questioning your frustration or your persistence in getting to the root of the problem, on the contrary in fact, I think many of us are following this with great interest.
It was just your comment that AN are holding up your build that confused some of us... especially as you don’t yet have your new Webcam! Come on, just admit it, you were laying it on a bit thick there!
In your shoes, I would proceed with the build as soon as my new cam arrived. IMHO the AN analysis can happen in parrellel to your engine build. And, FWIW, I would be very surprised if their analysis declares any fault with the cam.
I think we all have to make our own choices, but often based on very little hard evidence, so hopefully your findings will helps many others. Personally, I decided long ago that hard welded cams and good oil with high zinc content where the way I would go.
Good luck with that!I just want a straight answer!