roller cam followers
Turbo Mini Forums

What are the advantages of a roller cam follower over the traditional flat tappet follower ?

The benefits are described on most of the suppliers websites. For instance...

http://www.minispares.com/Product.aspx?pid=37972

http://www.minisport.com/mini-spare-parts/..._MSLMS0483.html

In the 13's at last!.. Just

One of you is misunderstood..Do you mean roller rockers or roller cam

well, wear is obviously going to be a factor, along with friction/resistance (i.e.powerloss), also i believe roller followers allow ramp angles that normal cams cannot give

aaaaaaages ago a lad on here who's name i darent mention for fear of legal action (mini1071s) was going on and on, and on and on and on about these, whether he managed to convert a mini series block to take roller followers or not well never know as he was full of wild claims and never substantiated any of them

have a search though, alot of what he said seemed to stack up

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Oh dear, it's been a long day.

Sorry, you said roller follower. Have a chat with mini13 Joe. He's been banging on about messing with these for an eternity.

JoeYbaby has pretty much summed it up.

In the 13's at last!.. Just

Wtf is roller follower? A follower with a roller bearing some how fitted in the top??

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

http://images.google.co.uk/imgres?imgurl=h...%26tbs%3Disch:1

EDIT: I think that they're used on high powered V8s in the US.

Edited by Rob H on 21st Apr, 2010.

Oooh very interesting!

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

I'm sure there must be someone on this forum with the skills to make this happen

If something is worth doing, it's worth doing half of.

The hardest bit to make happen is a keyway...

The roller follower cannot be allowed to rotate as normal cus the roller will point the wrong way :) So a keyway down the follower hole is required.. not so easy to machine

Chris

will the follower rotate in its seat? As in spin around so the roller bearing is pointing the outwards

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

yes, you have to consider the time that it spends not in contact with the cam ie the base circle.

Base circle is good way of putting it. Wonder if anyones tried it?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

I have had a long hard think about these in the past, after seeing them in the obligatory copy of Hot Rod magazine when over in the US.

Some of the ones I've seen seem to come in pairs, with a sliding tiebar between them to stop the spinning and keep them in the same axis. I reckoned that it would be relatively simple to fit them in a 998 or S block, where the tappet chests would allow easy access.

Having said that, you can't run them on a normal cam - the profiles are wrong for the rollers... so you'd then have to develop an A-series roller cam.

Metric is for people who can't do fractions.

roller cams have been done in the A, but only in the blocks with tappet chests as mentioned,

also as mentioned you would need a custom grind for a few reasons, first off you want a rounded lobe, and different tappet ramp shape, also the lobe needs to be flat, I belive A series ones are ever so slightly skewed to make the follower rotate,

also flat tapet cams actually lift faster than a roller cam can at low lifts, so you need to really get the profile lifting ( and dwelling at full lift) to utelize the flow of the head.

I have looked at many sets of followers to see if they could be made to go into the non tappet chest block, about the best bet are jesel solid keyed followers, these can be picked up from nascars with test mileage on them, but are only availabel in .937" diameter which may be too big to fit,
another posibility is the lifter from the ford/mazda 4.0 V6, it is .86 diameter, but is heavy and has hudraulic gubbins in which you would want to lose.

Another thing I've pondered is whether it would be possible to build a cam follower that looked like the end of a biro - a cylinder with a captive but free moving ball bearing in the bottom.
It would alleviate the spinning problem and allow them to be fitted to any block, but I suspect that the forces involved would destroy cam and follower in short order, or at best leave a groove in the cam...

Metric is for people who can't do fractions.

How about a kewayed follower & a pin trough the block to prevent it spinning?

[X] nail here for new monitor

yes but you have to get the hole through the block in the right place, plus you then have to put a groove into a hardened follower.

doesnt sound so hard ..

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

says the mad scientist!

How long before roberts nocked this up?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

And you still have the profile of the camshaft issue ...

Even in a "cost no object" project, it would sound like hair splitting, especially in a turbo mini ...

My crazy thoughts of a few weksbacks was to use two A series camshaft in overhead design for a X flow 16 valves head.

Could work for 8 valves thought ...

Rusty by nature

I give it a week.

I give it a decade before it's built ...

Rusty by nature