Roller Lifters

[High Priority]

Who makes the best roller lifters? We are having problems getting the rollers to live, we are running high spring pressure. We are currently using Clowler with high pressure oiling. Thanks in advance.

[MILD THUNDER]

Who makes the best roller lifters? We are having problems getting the rollers to live, we are running high spring pressure. We are currently using Clowler with high pressure oiling. Thanks in advance.

Not sure about clowler. Never heard of them. I assume you mean Crower?

As for a good lifter, check out isky "EZ Roll" lifters.

http://www.iskycams.com/pdf/1-ISKYCatalog2009f_01Master%20Catalog2004%20(Page%2028).pdf

[imco offshore]

Warren , what are you calling high spring pressure,? and what rpm,s do you run ?

[High Priority]

The spring pressure is about 400 lbs on seat, and around 850 lbs over the top. We turn the motor to 6500 rpm. with a 24 pitch prop.

[PatriYacht]

That's an awful lot of pressure. What are the cam specs? 250 seat 600 open is usually good for solid rollers up to about .700 lift 260 duration.

[MILD THUNDER]

That's an awful lot of pressure. What are the cam specs? 250 seat 600 open is usually good for solid rollers up to about .700 lift 260 duration.

What he said. Thats some serious spring pressure. Cant see that working real well for a marine application. I can see why your going thru lifters.

[High Priority]

I agree that is a lot of spring pressure, but we were dropping intake valves like they ere going out of style till we ran the pressure up to where it is. Now we are breaking lifters. The cam people tell me the cam and take it with no problem, in fact they tell me the cam will like it. I just need a set of lifters that can take the pressure, and we should be good to go for a while.

[jeffswav]

If you whant things to hold up you should call Bob RMbuilder. He can set you up with a matched setup that will work well together.

[imco offshore]

that is an awful lot of pressure, for 6500 rpm,,,i would make the cam people who said it was ok,,, provide the lifters , so it will fall back on them!! we have an aluminum big block roller motor , that turns 9200 ,,and no where near that spring pressure,,put the problem back on the cam people,let them tell you what,,,other wise you will keep eating it,!!

[High Priority]

Thanks for the advice guys.

George, are you going to run St. Clair this weekend?

[Whoz Your Daddy]

Warren

Get that thing figured out and on the trailer for this weekend.

Mike

[Tyler Crockett]

Warren I run 200#s on the seat but I use a titainium intake. You should not need more than 240#s on the seat. I would look into the cam profile. I spent some time on a spintron machine and your profile might have a bad harmonic going on at that rpm or your pushrods could be flexing.

[imco offshore]

Thanks for the advice guys.

George, are you going to run St. Clair this weekend?

yes , my boat is already their,,i get their thursday at noon.:cheers2:

[High Priority]

Thanks Tyler, I just sent a cam to a friend of mine in NJ. that is going to check for just that. I really dont think the push rods are flexing, because they are 7/16 push rods, but I guess anything is possible.

Sounds good George seeya there.

[PatriYacht]

It might be that the cam profile is too severe for an endurance engine. A drag race engine only has to run for a couple of hours total between rebuilds. I was really surprised at how soft the ramps were on the cam that RM speced for me.