10 replies to this topic

[cap'n crunch]

Rollers? or steel?

I know there are benefits to rollers such as reduced side loading on the valve stem and less friction however is this worth the extra £100 - £200?

such as http://www.minispare....aspx?pid=34682

Or to stick to steel rockers

such as http://www.minispare....aspx?pid=34870

i am looking at this as i am intersed in getting some 1.3 rockers but i am unsure what to go for, are rolller rockers worth the extra money?

[*DJH*]

Rollers? or steel?

I know there are benefits to rollers such as reduced side loading on the valve stem and less friction however is this worth the extra £100 - £200?

such as http://www.minispare....aspx?pid=34682

Or to stick to steel rockers

such as http://www.minispare....aspx?pid=34870

i am looking at this as i am intersed in getting some 1.3 rockers but i am unsure what to go for, are rolller rockers worth the extra money?

Steel all the way, you'll only need the rollers if you have a seriously powerfull engine

[Jammy]

And even if you do have a seriously powerful engine, Steel seem to be ok. Bill Richards stuck a set of Cooper S rockers on my 1425 race engine. If they are good enough for him, they are fine for me!!

[cap'n crunch]

so there is not going to be any real/noticable benefit from the rollers and the extra £100 spent (apart from being bankrupt > )

[TOMMO0302]

Doesn't appear that way, and based on your other thread it doesn't appear as though there may be a noticeable difference with the new steel rockers.....? Since the standard ratio is 1:1.25 iirc

[cap'n crunch]

well from what i was told in that thread the ratio can vary from 1.2 to 1.3.....hmm i should probably check my current rockers.

does the ratio for the rockers change depending on 998 or 1275? or are they standard through out?

[samwell]

think it changes more to do with age.

I think the later the car, the closer to 1.2 as far as i can tell. Kalver's dun a piece on it on minispraes

dno how to do links so hear it is http://www.minispare...le.aspx?aid=142

samwell

[Sprocket]

I would personaly use the roller tips, if the head you have has bronze guides.

[cap'n crunch]

why would having bronze guides make a difference to rocker choice?

and are 1275 rockers higher ratio then 998?

[The Matt]

why would having bronze guides make a difference to rocker choice?

and are 1275 rockers higher ratio then 998?

Bronze guides aren't as hard wearing IIRC, so by using roller rockers and imposing less side load on the valve stem you'd probably stand less chance of valve guide damage?????????? I guess that's the theory?

[Dan]

and are 1275 rockers higher ratio then 998?

No.