High Priority
Competitor
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.
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Roller Lifters
- Thread starter High Priority
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MILD THUNDER
New member
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 Catalog2004 (Page 28).pdf
imco offshore
Competitor / Charter Member
Warren , what are you calling high spring pressure,? and what rpm,s do you run ?
High Priority
Competitor
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
Charter Member
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
New member
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
Competitor
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.
imco offshore
Competitor / Charter Member
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
Competitor
Thanks for the advice guys.
George, are you going to run St. Clair this weekend?
George, are you going to run St. Clair this weekend?
Whoz Your Daddy
Competitor
Warren
Get that thing figured out and on the trailer for this weekend.
Mike
Get that thing figured out and on the trailer for this weekend.
Mike
Tyler Crockett
SO Tech Expert/Competitor/Charter Member
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
Competitor / Charter Member
yes , my boat is already their,,i get their thursday at noon.:cheers2:
High Priority
Competitor
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.
Sounds good George seeya there.
PatriYacht
Charter Member
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.
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