10 replies to this topic

[dan-russell]

Hi all,

I have just secured sponcership with kent cams for a MD266 ket cam with new rockers and springs. I was thinking of putting hi lift rockers on it to but i am not to sure if it can be done, can anyone help me can it be done or not?

Thanks all.

[jaydee]

Can be done, but personally i wouldnt fit anything over 1,3 for the rockers.
Anyway the lift of the kent 266 isnt really high, and can cope with high lift roller rockers.
Depends on what you after (road/fast road/rally/track), keep in mind 1,5 and 1,7 rockers tend to wear out cam lobes and you can have issues with valve springs using them with a hi lift cam.

[dan-russell]

well its being used as our track car, so really we want it to be quick so...

[jaydee]

You can try 1.5 on a track car, personally i'd rather go for a 296 cam instead of a 266 with 1.5 rockers.
Rockers cost a lot of money for the few bhp thay can give.

[dan-russell]

well, i didnt get much of a choice with the cam as its being sponsered by kent cams it was, well thats the one we can supply, so we went with it

[Frog]

well, i didnt get much of a choice with the cam as its being sponsered by kent cams it was, well thats the one we can supply, so we went with it

Hi Dan,
Yes you can run 1.5's on a 266 as a track day car it would be fine, my dad is currently 1.5's on a 286 in his 1330, but this is his road car, If you got them, go for it I say. Just make sure you time it all in spot on.

[Ethel]

High ratio rockers don't wear cams & followers, can't imagine where you got that idea from.
Excessive spring pressure wears cams and that's proportional to the rocker ratio - fit rockers that give 25% more lift and you only need springs 83% as strong to do the same job.

There's no black art to rockers, a bigger ratio proportionally increases everything on the valve side and reduces everything on the cam side. The intelligent thing to do is look at the cam & rockers as a system to get the valve opening characteristics you want - pushrod engines don't have many advantages so you may as well make the most of any they do have.

[jaydee]

High ratio rockers don't wear cams & followers, can't imagine where you got that idea from.

From a cam taken off an engine with 1,5 rockers...
By the way this has been covered by AC dodd on his website too.

[dan-russell]

I have been offered a set of pressed steel 1.27.1 rockers, are these hi lift as i thought they were standard???

[jaydee]

Good standard rockers.

[dan-russell]

Thought they were stanadard ones