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  #16 (permalink)  
Old 08-25-2011, 01:30 PM
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Originally Posted by tod75154 View Post
John, Thanks for the good info.. I will be replacing mine to the MoCo lifters when the time comes.

Frank, I have a question about the Jim's rockers.. does it change the overall lift? I remember reading somewhere that Ultima gets the overall lift by the rocker arm ratios 1.7 if I remember right from the book. So .625" lift cam that results in an overall lift of .640"
Todd, The Jims Rockers can be had in a stock ratio or the 1.7's. The 1.7's are actually 1.745. (Ultima rockers are actually 1.69.)

Figure a stock rocker ratio is 1.625. Take the lift of your cam at the valve (lets say the intake is .625) and divide it by the stock ratio....1.625...

.625 divided by 1.625 = .385..That's your lift at the cam.

Now multiply that number with the new ratio...1.745...

.385 times 1.745 = .671825 which is .672 lift at the valve with the 1.7 rocker arms.


So...the 1.7's will bring it from .625 with the stock rockers to .672 lift at the cam.
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  #17 (permalink)  
Old 08-25-2011, 10:33 PM
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Quote:
Originally Posted by Mr Scary View Post
Todd, The Jims Rockers can be had in a stock ratio or the 1.7's. The 1.7's are actually 1.745. (Ultima rockers are actually 1.69.)

Figure a stock rocker ratio is 1.625. Take the lift of your cam at the valve (lets say the intake is .625) and divide it by the stock ratio....1.625...

.625 divided by 1.625 = .385..That's your lift at the cam.

Now multiply that number with the new ratio...1.745...

.385 times 1.745 = .671825 which is .672 lift at the valve with the 1.7 rocker arms.


So...the 1.7's will bring it from .625 with the stock rockers to .672 lift at the cam.
I think I know what your saying here man, could you do the same math using the Ultima rocker ratio with the numbers they have in the Engine manual?

Int. cam lift .640 / Ultima rocker ratio 1.69 = .379 lift at cam
.379 x Jim's ratio of 1.745 = .661 lift..

Or is there some reason your using the stock ratio??
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Old 08-26-2011, 01:29 PM
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The calculations are the same for any ratio...I just used the stock as an example. But, assuming Ultima uses the 1.69 as a factor in the cam spec...yes...you got it.
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Old 08-26-2011, 03:14 PM
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Originally Posted by choppers_rule View Post
Good info. John..thank you! I guess I need to replace them lifters on my Ultima 124" when my bike is done.
Wow, you got that rare ultima 124 huh? I heard about it but just assumed it was a legend like bigfoot....
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Old 08-26-2011, 07:14 PM
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Old 08-27-2011, 05:37 PM
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What do you guys use for pushrods???
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Old 08-27-2011, 05:44 PM
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What do you guys use for pushrods???
John, from Scooters.


Seriously...Andrews, Rivera, crane...6 to one, half dozen to the other.
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Old 08-27-2011, 06:14 PM
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John, from Scooters.


Seriously...Andrews, Rivera, crane...6 to one, half dozen to the other.
Hey I resemble that remark!

I like the Comp Cams Fast times see link below. They are quick install so in the future if you are just needing to pull the lifter blocks or do gear case work you will not need to mess with the rocker boxes

Comp Cams Fast Times Quick install EVO pushrods [ds193803] - $119.99 : Zen Cart!, The Art of E-commerce
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