Cam follower sizes
Turbo Mini Forums

Righty a few random questions... Are all cam followers the same size e.g large bore small bore, and if so does anyone know the sizes?

Second question... Does anyone have some rough dimension of the od of some exhaust valve springs and possibly the length too?

All will become clear very soon, but I'm just trying to work out whether and exhaust valve spring will fit inside a follower. :)

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1/4mile in 13.2sec @ 111 terminal on 15psi

i bet it has something to do with hydraulic lifters

Haha nearly, it's for some pneumatics I'm working on.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Bump this thread around 6pm if you havnt already found out i have a load sat on my bench
(And i will forget hahah)

Yes i moved to the darkside

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are you going to use roller lifters, i think small block chev lifters are pretty close to a mini size lifter, i know you have to bore the lifter bores out,

everybody likes free stuff

Followers as far as I remember are the same size small/large bore.

Also again from memory but I think if anything the follower would fit inside the valve spring not the other way around.

.841 from memory ?may be some other lifter im thinking of .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

i shall go measure my new ones after dinner i have waiting on the bench but i doubt it will be to good as i have a 2 dollar set of calipers = /

edit:
gotta be jokeing cant find them best i can do a steel ruler haha any ways 39.5mm x 20.5 or 1.555 x 0.807 lol i need a basic set of mics

Edited by Turbo This.. on 14th Aug, 2013.

810 thou, same for small and large bore,

If your looking at roller lifters I may have some stuff you can nab for a play about with.

Well my plan is to use my original mini cam fuel pump lobe to drive a piston type air pump, mounted in the original fuel pump location at the back of the block.

I'm limited to a 30mm housing for the piston as that's the size of the hole in the block. So if the follower is just of 20mm that could work! I was thinking of using a valve spring as that would be roughly the right weight of spring to prevent the piston from bouncing on the lobe at high rpm. But if its much larger I'm sure I can find one else where that would be suitable.

I've started on the housing, but just working out stroke positions etc.. For the porting of the pump.

The good thing about a follower is that it continuously rotates preventing any uneven wear on the bore of the pump or cam lobe, there rock hard and cheap and easy to replace, and by the sound of things dimensionally a possibility! :)

Joe - any chance of a pic of the roller lifters you have? They may be better than normal ones.

Edited by matty on 14th Aug, 2013.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Ah you may have a point, but I was lead to believe it was because the surface of the cam follower isn't flat, that they rotated?

I could always have the lobe reground at a slight angle if it'll help.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Will a oil pressure release spring work?