Back in the olden days, I used aluminum retainers from Crane in my Hipo 289
motor in my Tiger. They were part of a cam and kit that listed max hp at
7800 rpm. So Reducing sprung weight as Jarrad say is the correct thing to
do I guess.
mayf
At 11:02 AM 7/10/00 -0700, Jarrid Gross wrote:
>Steve Silverstein wrote,
>
>
>
>>I have a new set of lifters for my Series V which have been cut down in
>>height, roughly 2/3 as tall as stock. They came with the race car.
>>
>>Has anybody run a set of lifters like this? The notes on the engine state
>>that the lifters were lightened by 30%. I suppose these would work. Are
>>there any drawbacks to using these?
>
>Cutting the top third off the lifter wont lighten it by 30%.
>The mass of the lifter is concentrated at the cam end.
>No major drawbacks, but the shorted lifter will promote faster
>bore wear, and bore "barreling".
>
>
>>Also, does anybody run Aluminum Valve retainers? I have a set of NOS for
>>the race car but the machine shop I have work done really thinks I should
>>steer clear of the aluminum retainers. I guess they had bad luck on a
>Chevy
>>motor or two...
>
>I cant comment on aluminum keepers, but I had a set of titanium keepers
>cut down to the spring size of the alpine.
>
>Also, there are lighter springs available, as well as lighter valves.
>With the spring mass reduction you only get to keep half the mass
>difference,
>but with lighter valves and retainers you keep all the mass difference.
>
>On my hipo alpine head, I was able to reduce the sprung mass by over 20%.
>
>In plain english, by reducing the sprung valve-train mass by 20%, one
>can reduce the spring load by 20%(all things the same).
>OR
>The RPM at which the valves float will be 20% higher (all things the same).
>
>
>
>Jarrid Gross
>
>
L.E. Mayfield
124 Maximillion Drive
Madison, Al. 35758-8171
ph: 1-256-837-1051
http://home.hiwaay.net/~lemay
lemay@hiwaay.net
Sunbeam Tiger, B9471136
Sunbeam Alpine Bonneville Land Speed Racer,
'66 Hydroplane Drag Boat (390 FE)
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