New motor, fresh carnage. One warm up, one easy pass, then straight to the garabage can....... :ball: It is still yet to be decided what the exact cause of the failure was. It is my determination that the lifters have imperfection on the rollers that caused them to bind in the lifter and dragg over the lobe. Other lobes had evidence of the lifters dragging over them.
Car at the Nats A pic of my juice monkey at the 06 Nats..... It was really looking forward to wearing out that new Bulldog. Especially in it's limping around condition.......Indy is coming through........... :Brow:
Hey Rick, sorry to hear about the cam. What causes this type of problem on a roller cam. Just curious. :TU:
Sorry to here that and to see it. We have some Friend's that Run the Shubeck's. In there Sprint Car Motor's. They Lost 5 or 6 Cam's they where not Rockwell Hardened a nuff. The Lifter where Eating Lobes ever Time. I had a nother friend that has a 540 BBC and the Shubeck's where eating the Cam's to. They are very nice Light weight Lifter's. They are very Price. Put if they keep eating Cam's and no one can Rockwell Harden the Cam a nuff i wouldn't run them. Car look's good were is the Window Trim and wheel Well Moldings i sent you? Just my 2 cent's
Car looks great! Hate to see engine damage Rick,and I hope its fixed soon...I was looking forward to seeing it run...did you say it has a Bulldog block? Hope to see it soon...Fish
Rick, That sucks!!!!!!!!!! :af: Was looking forward to see how it was running. Hope you get it figured out soon. I see key lifter bores too, what kind of lifters are they? Keep us posted! Best of luck Fish, Not a Bulldog block, it has a lifter bore girdle in the picture.
That's pretty sad...I was wondering something, remember at the Nats. you mentioned the spring pressure, even Bob did a double take at that, anyways, if those lifters are light weight, what are the chances that they're too light, not enough mass for that amount of spring pressure, causing them to drag, as you mentioned. Maybe with them being so light you don't require as much spring press. I know that the roller cam needs alot of spring pressure, and I'm not to familiar with those lifters, but is it common to use them with monster lift and crazy spring pressure?? Are the push rods bent?? Keep me updated... Gary G.
Spring Pressure? What was you Spring Pressure Open and Closed Rick Crawford ? The install Height? It doesn't look to me like a Vavle Spring Problem. It looks to me as the Cam is to Soft and and the Roller are Eating it Any thought's on this
I hope you didn't overtorque the lifter girdles? Also you need to check lifter clearance between the bushings and the lifter with the girdles torqued to the right spec and see if it changes fron 0 preload specs. You could have stuck the lifters in the bores. Spring pressure did not do this on a solid roller cam.
I should have another cam and set of lifters by Friday. Just in time to throw it together for Indy...
Rollers.... It is not a spring pressure problem or a binding problem from the girdle. I was running 300+ on the seat and @850 open pressure. From what I see, the rollers had imperfections(flat spots) on the rollers and did not roll smoothy in the lifter. When they were loaded with all the spring pressure the roller locked up in the lifter cavity and caused the roller to lock up and skid across the lobe. One roller lifter dug into the left side of the lobe, across the left top of the lobe and back down the left side of the lobe. Since the cam lobe is square, I can only assume that the roller was larger on one side than the other due to the wear and that the roller is not square with the lifter. The lifter rollers look like new other than what I see as "imperfections". The cam also has scuff marks on some of the lobes as evidence that the rollers were locking up. I am still waiting for Schubeck's opinion of the lifters as they have not had a chance to cut the rollers up to examine the rollers. I also plan to check the Rockwell of the cam when it gets back since I was a bit disappointed from the cam people and there observations. I also plan to check the oil passage alignment and lifter oiling alignment to make sure it kept oil pressure at the lifter. They are designed to "float" on oil in the pocket the roller sits. But with Buicks, there should be more than enough oil "hemoraging around to keep things wet. All the pushrods look good, and I am not the only one running these kinds of spring pressure in the Buick. :Brow: Just the only guy talking about it.
If ya do put a solid flat tappet back in, here's what my friend found on the Comp Cams web site, and I just did this on Sat. breaking in my street motor. Comp Cams recommends using oil for diesel engines, current oils are designed more for modern engines with less friction, roller cams etc. but the diesel has friction reducing properties which are great for doing a flat tappet cam break in. I bought Shell Rotella diesel,15w-40, $9.50 a gallon, it has a different rating on the back of the containers, "C or C plus". Check out their web site some great info. Just remember, to go roller will cost about 3 times what a good flat tappet will cost, and the performance gains probably aren't worth the money, unless money is no object........ Gary G.
Gary, I had just read this about the oil shortly after I broke this cam in, which did not give me a good feeling... Don't use any oil with the starburst on the bottle in a race engine! I am pretty sure it was the oil that killed the cam. As for going to a roller, I have springs and lifters already. So the cost wouldn't be too bad. Jeff, I will take a look to see what you have.
