Roller lifters input
05-05-2005 | 11:54 AM
#43
Registered
Joined: Jul 2002
Posts: 2,867
Likes: 3
From: Waterford,MI
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.
05-05-2005 | 12:18 PM
#44
Thread Starter
Registered
Joined: Jun 2003
Posts: 85
Likes: 0
Re: Roller lifters input
Originally Posted by PatriYacht
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.
05-05-2005 | 03:34 PM
#45
Registered
Joined: Mar 2004
Posts: 2,696
Likes: 93
From: Pa
Re: Roller lifters input
Originally Posted by Mr Gadgets
Just a thought here.. the solid rollers.. it was mentioned they can handle 6-8k rpm.. but how do they handle 600 rpm for all the no wake zones? I think that is where my problem exsists.. low rpm, at least that is what I have been told.. 
05-05-2005 | 03:40 PM
#46
Registered
Joined: Mar 2004
Posts: 2,696
Likes: 93
From: Pa
Re: Roller lifters input
Originally Posted by Johnny DCB
Now is that with a stock GM block or aftermarket one? Doesnt the Dart,Merlin,etc. blocks have better oiling systems?
05-05-2005 | 06:47 PM
#48
Banned
Joined: Jan 2005
Posts: 648
Likes: 0
From: Tri-Cities, TN
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
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
05-05-2005 | 08:23 PM
#49
Registered
Joined: Mar 2004
Posts: 2,696
Likes: 93
From: Pa
Re: Roller lifters input
Originally Posted by Johnny DCB
I have no worries about the boat,its me that hasnt been that fast behind the wheel before. LOL Im excited to see how this thing will excellerate thats for sure.
