1.55 or 1.65 Roller Rockers

[87WE4BOOSTED]

I somehow found a way to fit some T&D Roller Rockers (Cool Guy Part) in the budget. I know they are not needed for what I’m trying to do and Stock will work just fine, I just want to have a complete roller valvetrain.:redface: I'm will be placing these on a set of Champion Irons set up for a roller cam, using K-MOTION-750 Springs. I do know the 1.55 are stock. Should I go with the 1.55 or 1.65? I really don't understand what the two different ratios would offer as far as performance. Please bear with me, I'm on a new learning curve about the valve train and understand it's a very important part of the cars performance.

Any advice is appreciated.

Thanks,

Steve

 

[mikestertwo]

Depends on what cam you are going to use. What are your goals?

 

[87WE4BOOSTED]

Roller Rockers

Depends on what cam you are going to use. What are your goals?

I will be using the Webber 206/206 Billet Roller.It has 500' Lift. My goal is to build it strong enough to dip in the 10.50 and slower range.
With all the searching I did on this subject, I see alot of people syaing Stockers will work fine in that time range, but if the MONEY permits go ahead and do Roller. I hear it make adjustments easier and etc,etc...I never can find why should I use either 1.55 or 1.65 in any application. This is where my ignorance in valvetrains begin.

Thanks for your response.

 

[ESP Products]

You have to do the math first and see if the 1.65 roller rocker will fit. Meaning, if the max "cam" lift is .50" x 1.65 = 0.825 of "valve" lift. Check the installed height of the springs and where coil bind occurs. A common installed height is 1.75. 1.75 - 0.825 = 0.925. This is how far the spring will be compressed with the 1.65 Roller Rocker. Now, where's coilbind occur??? 1.55 would be 1.75-.775=0.975 PS: I think this number you gave, 500', is not the cam lift. Get that number, you have the formula, just do the math.

Hope this helps you.

 

[Scooter3800]

I was told to go 1.65 with my setup and this combo screams! I say go 1.65 because your only talking about ~.500" of lift. I'm using the 210/215 from FTSS with 1.55 rockers its .516" with 1.65 its .548" I don't have problems with valve to piston interference. FWIW

 

[87WE4BOOSTED]

You have to do the math first and see if the 1.65 roller rocker will fit. Meaning, if the max "cam" lift is .50" x 1.65 = 0.825 of "valve" lift. Check the installed height of the springs and where coil bind occurs. A common installed height is 1.75. 1.75 - 0.825 = 0.925. This is how far the spring will be compressed with the 1.65 Roller Rocker. Now, where's coilbind occur??? 1.55 would be 1.75-.775=0.975 PS: I think this number you gave, 500', is not the cam lift. Get that number, you have the formula, just do the math.

Hope this helps you.

This formula makes sense!! I asked a different question in another thread I opened and Bison also asked me what was the lift. :redface: I will call Webber and get all the specs of this Cam. I know he will tell me which size I should use as well.

Thanks,