Re: Roller lifters input
 

You are correct Mr. Gadgets.

Chris

Re: Roller lifters input
 

What effect does low rpm have on a lifter?

Re: Roller lifters input
 

They are lubricated, cooled by splash and at low rpm's they don't get enough. I think this led to my loosing a lifter after a 2 hour idle up a no wake river. Next time out it failed. What a mess.

Re: Roller lifters input
 

Now is that with a stock GM block or aftermarket one? Doesnt the Dart,Merlin,etc. blocks have better oiling systems?

Re: Roller lifters input
 

That's why Jessel, Crower and maybe others have the pressure pin oiling option. [hppo= high pressure pin oiling] so the lifter and lobe get constant oil, no matter what rpm.

Re: Roller lifters input
 

I've had good luck with the big M.

Re: Roller lifters input
 

I know the Isky's I am running have the pressurized pin oiling as well. I have heard the Isky's are made by Morel? Any truth? BigM block is an awesome piece!

Craig

Re: Roller lifters input
 

Most of the lubrication that the cam and lifters gets is from "spash". At low rpm the lack of splash severly reduces the amount of oil the lobe and lifter gets. Now the lack of oil causes the needle bearings to get hot. Which then cooks the limited oil that is present. Once this oil is cooked excess tolerance builds up in the bearing and axle area. This excess area is now hammered by the excessive spring pressure that roller cam profiles require for high rpm. Lifter fails.

As Mr Gadgets correctly pointed out, high rpm does not kill rollers. Low rpm does.

One thing you can do is go to big lifters such as the .903" or .933" stuff. The larger nose area distributes the load better.

I would not use a solid roller lifter without direct oiling in a boat.

Chris

Re: Roller lifters input
 

How much hp are you planning to run?

Re: Roller lifters input
 

I'll be happy with 1000 but it will be closer to 1300 I hope.Atleast thats the mark we're shooting for.