Roller cams

[850man]

Anyone using roller camshafts/lifters in A series engines?
We are currently doing some R&D with them and I am wondering who else out there is getting good results?
We currently have a B series race engine in the workshop with a Roller set up and I aim to use the same in the 8 port motor I am building, but I haven't seen much information from people using it in a A series engine.

[PaulH]

Hi 850Man,
we had a bit of a chat about them over on Turbo Minis, we came up on a few stumbling blocks. Id be very interested to see how you got over the problem of stoping the Roller follower spinning. Also are you running this setup and if so is it on a big bore or a small bore ??

cheers Paul.

LINK to TM chat >> http://www.turbominis.co.uk/forums/inde ... tid=357557

[CooperTune]

I'm need to look for my notes and drawings from 30 plus years ago when I considered it. Was building SB Chevys for Saturday night short track NASCAR. It would be simple with a open back block. My plan was to drill and tap the lifter bores from the rear of closed blocks. A bolt with a pin going into a slot in the lifter body would do the trick. I decided it was not worth the cost as I was turning 9200 rpm and valves were not my problem. Steve (CTR)

[850man]

We will be using a Mk2 S block, with the lifter bores enlarged to suit the larger roller lifter.
I am not sure how the lifter will be kept straight, they may have a cradle or a key way, I will have to go and find out more information. I know a spring will keep the lifter in contact with the cam at all times, separate to the valve spring.

[CooperTune]

Take a look at SB chevy roller cam kits. We called the springs above the lifter pushing down on lifter a rev kit not always used. The lifters were tied together by tie bars each pair (cyl) with a bar between them that allows them to move independent but not rotate. I backed away when the cost seemed to be greater than return. Steve (CTR)