Roller Rockers
Thread Starter
MFIC
Joined: Aug 2005
Posts: 1,997
Likes: 14
From: Charlotte, North Carolina
Roller Rockers
Do anyone here use these ? Pros ? Cons ? I have stock cam and I'm looking for a little more HP without the hastle of replacing the cam.
Patriot Harland Sharp Shaft Mount 1.8 Non-Adjustable Roller Rockers
Patriot Harland Sharp Shaft Mount 1.8 Non-Adjustable Roller Rockers
Thread Starter
MFIC
Joined: Aug 2005
Posts: 1,997
Likes: 14
From: Charlotte, North Carolina
That is the picture that LM shows on their website, do you think the cranes helped you any ?
Originally Posted by vettenuts
Don't know anything about the Harlands, but have run the Cranes. Those look adjustable by the way.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
I think those are adjustable Harland Sharps. They make both varieties. There are 3 things to consider when changing to aftermarket rollers.
---
1) The moment of inertia is usually larger. Even though the roller helps with friction due to more weight at the tip from the roller wheel and bearing. Consequently the inertia is a little greater.
2) If you go with a higher ratio rocker you will increase the acceleration characteristics of the cam lobe.
---
Both of these items will decrease the stock springs' ability to control the valve train at high rpm's. If you are going to change to aftermarket rollers I would suggest upgrading springs, retainers, and pushrods.
---
3) The third item is interference. Some aftermarket roller rockers have clearance problems with certain heads for one reason or another. I had to clearance my heads for the Harland Sharps and hog out my valve covers and machine the Jesels for retainer clearance. I have read that others have done this and others have been fine. Bottom line here is you have to try to fit them and if you are lucky, they fit, if not it's time to take out the die grinder.
---
I've used both Harland Sharp and Jesel 1.7 roller rockers on my AFR 205's. They are both good products and I have had no problems with either one other than interference.
---
1) The moment of inertia is usually larger. Even though the roller helps with friction due to more weight at the tip from the roller wheel and bearing. Consequently the inertia is a little greater.
2) If you go with a higher ratio rocker you will increase the acceleration characteristics of the cam lobe.
---
Both of these items will decrease the stock springs' ability to control the valve train at high rpm's. If you are going to change to aftermarket rollers I would suggest upgrading springs, retainers, and pushrods.
---
3) The third item is interference. Some aftermarket roller rockers have clearance problems with certain heads for one reason or another. I had to clearance my heads for the Harland Sharps and hog out my valve covers and machine the Jesels for retainer clearance. I have read that others have done this and others have been fine. Bottom line here is you have to try to fit them and if you are lucky, they fit, if not it's time to take out the die grinder.
---
I've used both Harland Sharp and Jesel 1.7 roller rockers on my AFR 205's. They are both good products and I have had no problems with either one other than interference.
Thread Starter
MFIC
Joined: Aug 2005
Posts: 1,997
Likes: 14
From: Charlotte, North Carolina
Originally Posted by ArKay99
I think those are adjustable Harland Sharps. They make both varieties. There are 3 things to consider when changing to aftermarket rollers.
---
1) The moment of inertia is usually larger. Even though the roller helps with friction due to more weight at the tip from the roller wheel and bearing. Consequently the inertia is a little greater.
2) If you go with a higher ratio rocker you will increase the acceleration characteristics of the cam lobe.
---
Both of these items will decrease the stock springs' ability to control the valve train at high rpm's. If you are going to change to aftermarket rollers I would suggest upgrading springs, retainers, and pushrods.
I should buy new push rods and valve spring + retainers
---
3) The third item is interference. Some aftermarket roller rockers have clearance problems with certain heads for one reason or another. I had to clearance my heads for the Harland Sharps and hog out my valve covers and machine the Jesels for retainer clearance. I have read that others have done this and others have been fine. Bottom line here is you have to try to fit them and if you are lucky, they fit, if not it's time to take out the die grinder.
If they are made for stock LS1 heads there should be no interference ?
---
I've used both Harland Sharp and Jesel 1.7 roller rockers on my AFR 205's. They are both good products and I have had no problems with either one other than interference.
---
1) The moment of inertia is usually larger. Even though the roller helps with friction due to more weight at the tip from the roller wheel and bearing. Consequently the inertia is a little greater.
2) If you go with a higher ratio rocker you will increase the acceleration characteristics of the cam lobe.
---
Both of these items will decrease the stock springs' ability to control the valve train at high rpm's. If you are going to change to aftermarket rollers I would suggest upgrading springs, retainers, and pushrods.
I should buy new push rods and valve spring + retainers
---
3) The third item is interference. Some aftermarket roller rockers have clearance problems with certain heads for one reason or another. I had to clearance my heads for the Harland Sharps and hog out my valve covers and machine the Jesels for retainer clearance. I have read that others have done this and others have been fine. Bottom line here is you have to try to fit them and if you are lucky, they fit, if not it's time to take out the die grinder.
If they are made for stock LS1 heads there should be no interference ?
---
I've used both Harland Sharp and Jesel 1.7 roller rockers on my AFR 205's. They are both good products and I have had no problems with either one other than interference.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Yes, the AFRs are aftermarket.
I had the Harland Sharps and concur with ArKay99 - I had minor interference with the heads (removed about 0.10inch with a Dremel) and had to canabalise my valve covers to clear them.
I had the Harland Sharps and concur with ArKay99 - I had minor interference with the heads (removed about 0.10inch with a Dremel) and had to canabalise my valve covers to clear them.
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