Rocker Arm Test

[Stan Weiss]

I find the results very interesting.

https://www.youtube.com/embed/TvQHgt-tF7Y

Stan

[swampbuggy]

Thanks Stan for posting that, Hope it does not give too many people the wrong impression, if you know what i mean. Mark H.

[pamotorman]

on a circle track engine you will see lower oil temps with a roller fulcrum rocker because of less friction. look at a stock LS rocker roller fulcrum with a slider tip.

[swampbuggy]

P a motor man expand on your last sentence in your reply please thanks Mark

[pamotorman]

a picture is worth a 1000 words. https://www.gmpartsdirect.co/oem-parts/ ... eBEALw_wcB

[Stan Weiss]

In the late 60's. I ran a M/T Aluminum rocker arm that was very similar to that on a 23 degree SBC.

Stan

[pamotorman]

In the late 60's. I ran a M/T Aluminum rocker arm that was very similar to that on a 23 degree SBC.

Stan

i remember one that was cast aluminum with a pressed in hardened insert where it contacted the valve tip. it may have been a shaft mounted rocker as that was a long tine ago

[jeff swisher]

I have installed the Comp roller tip 1.52 ratio rockers on a couple engines and seen NO gains anywhere.
Of course these were milder builds 230@ .050 or less on the duration.

One thing that keeps me away from those now are longevity of the roller tip.
I have removed quite a few that the roller tip had worn a flat spot onto it.. it really does not roll as much as it rocks back and forth.



I would like to know what cam and spring pressures were used in that engine.

[Stan Weiss]

In the late 60's. I ran a M/T Aluminum rocker arm that was very similar to that on a 23 degree SBC.

Stan

i remember one that was cast aluminum with a pressed in hardened insert where it contacted the valve tip. it may have been a shaft mounted rocker as that was a long tine ago

The SBC ones that I ran were stud mounted. This is he only picture I have and it is for a shaft rocker. The SBC also did not have the adjuster but had a harden cup for the push rod.

Stan

MT-Rocker-Arm.gif

[swampbuggy]

It's hard to believe GM can offer that rocker arm at that cheap of a price

[swampbuggy]

I was told a while back that the NASCAR engines were not using a roller tip rocker arm they found that they weren't actually rolling so just went to slider which meant less app to give problems

[andyf]

I did a rocker arm test for Car Craft magazine where the engine did not pick up any power. That test didn't get a lot of attention since people want to see tests where the engine makes more power. But the important take away is that rocker arm ratio only makes more power if the engine wants more lift or faster valve motion. If the engine doesn't need faster valve motion or more lift then the extra rocker arm ratio is just a waste of money.

The hard part is figuring out if your engine needs more ratio or not. I don't know of any way to figure it out other than testing. It is a complex relationship between cam timing and head flow. Something as simple as changing the valve job will change the engine's desired rocker arm ratio.

http://www.hotrod.com/articles/trying-f ... m-testing/

[Ericnova]

Crane/Cam Dynamics advertised a gold extruded aluminum roller trunnion rocker with a shoe tip insert instead of a roller, sometime in the late 1980's or early 90's.

They also had one with a removable and reversible pushrod cup insert that allowed the user to choose either 1.5 or 1.6 ratio for the SBC, I don't know if it was offered for anything else.

I don't recall if the shoe tip and reversible pushrod cup were offered in the same rocker or not.

Both disappeared from the market around the same time as each other, in the first half of the 1990's if my memory is correct.

[pamotorman]

It's hard to believe GM can offer that rocker arm at that cheap of a price

when you produce millions and millions the cost per unit comes down

[pamotorman]

I was told a while back that the NASCAR engines were not using a roller tip rocker arm they found that they weren't actually rolling so just went to slider which meant less app to give problems

i know when the RO-7 came out it had roller tipped rocker arms.