Rockers Good & Bad
Turbo Mini Forums

Got the head off at the mo and I'm looking at the Rockers. I was running 1.5 roller tips with a std 998 cam, I was thinking about going back to Standards I have the pressed steel type and the later 1275.

How do you check for wear? I have looked at the shaft on one set and its grooved so thats simple, however what about the bush/pad wear.

Thanks for any help.

Or should I stick with the 1.5's? with a standard cam?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I think I red in Vizard's book that 1,5 rocker on the SBU is not good (too much lift on overlap).

With the standart cam, there is less overlap so was your setup appropriate ?

What head / valve size was used ?

Sorry for the hijack ...

Rusty by nature

not sure I just tried it as I couldn't put a cam in. The overlap was making me think of swapping back.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

oh is there any advantage to looking at using spacers on standard rockers, or will this just reduce lift. I think I have seen an AC Dodd how to thing where they used them to increase, however my mind is thinking it will reduce lift.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

best bet is to fit roller tip 1.3 from minisport, i find the 1.5,s create to much valve train waer especially on the cam lobes. we have done tests here in suffolk and found little or no hp drop from going to 1.3' from 1.5's but the cam ware is non existant now so as they say the proof is in the pudding.

always looking for them bigger bunches of bannanas

the minisport 1.3 rockers are excellent value for money and are well made

oh just a quick question, found thee on ebay.. if they give more lift using offset bushes, would it be beneficial to run them on the inlets and standard on the exhaust? especially as I only have a standard cam?

I seem to remember a topic on it but it was disregarded as in that case it was the rocker shaft that was offset?

better put the link in...

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...atchlink:top:en

Edited by gr4h4m on 14th Jan, 2010.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I have been using a set of the early forged rockers with bushes like these for about 20 years and put them back after I had tried 1.5 rockers which were noisy and seemed to ake the turbo lag worse.

Its a cheap way to a bit more lift but probably not as good as a set of accurately made 1.3 rockers

What I was trying to say is that you could use 1.5 on the inlet and 1.27 on the exhaust, would this be any advantage instead of 1.5 on both inlet and exhaust?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

But you cant, because of the rockershaft..

Different lift for exhaust and inlet would require an over head cam ...

To your knowledge, did anybody did that using rocher shaft pedestal to hold the cam and followers ?

Rusty by nature

I recall Keith Calver doing an article regarding changing rocker ratios, cams and valve clearance.
It was in one of the last Mini Mags.
He also did some testing with different VC for inlets and outlets.

Don't know if it is of interest, didn't read it in detail.

Dazed and Confused....

I'm sorry V I not sure I fully understand, The link above was selling offset bushes for standard rockers to make them 1.5 ratio. I was thinking of only fitting the bushes to the inlet valves, or am I missing something?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Offset bush implie you move the pedestals the same amount or your pushrods will have an angle and your rockers won't push the valve with the appropriate area.

Those two problems sounds like more problems if taken lightly ...

And IIRC the lift difference is taken car of in the cam departement anyway ...

Rusty by nature

oh I see

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Also I will be completely amazed if a set of offset bushes will give you a 1.5 ratio.

This has not been stated anywhere in this thread.

Gr4h4am has currently 1,5 rockers and a standart cam.
He is willing to convert back to offseted 1,27 rockers to get 1,3 which is plenty enough on a SBU

Rusty by nature

I beg to differ, sir.

Gr4h4ms post of 15 January refers to a "offset bushes for standard rockers to make them 1.5 ratio"

Sorry about me not double checking before I say things in an unpleasant way !

Vizard states that offset bushes give an extra 30 thousands so that is far from what a 1.5 would do, you're obviously right.

Rusty by nature

Although Graham's post implies it, the link to JonSpeed doesn't actually say what ratio their offset bushes would achieve.

I too doubt it would be very much of an improvement.

Offset bushes alone can only alter the distance between rockershaft centreline and pushrod, they can't alter the distance between rockershaft centreline and valve stem.

So they can only be half as effective as an offset rockershaft assembly, but could give slightly different ratios between inlet and exhaust if used selectively.

My concern with offset bushes and a standard roccker shaft position would be that the rocker pad to valve stem radius centrepoint would be moved by an offset bush thus potentially increasing valve guide wear.

I think this is what Advantage is referring to here

Schrödinger's cat - so which one am I ???

What is on Jonspeed :

http://www.jonspeed4minis.co.uk/shop/produ...?productid=1333

One set of 8 Phosphorous bronze 1.5 offset rocker Bushes ( Brand new) These will give your valves higher lift for a longer duration, allowing more fuel at a faster rate thus increasing the power of your mini. These must be fitted to press steel or forged rocker assembly. Fitting instructions are supplied with every set.


If you ask me, it is misleading people to say the least ...

Rusty by nature

Interesting that the eBay link doesn't quote ratios but the internet one (above) does...

I still can't believe 1.5 is possible from an offset bush which is only an effective 0.5 times the offset...

But let Jonspeed prove me wrong.......

Schrödinger's cat - so which one am I ???

Fuck Jonspeed. There is noe way you can turn the std rockers into 1.5s. End of discussion.

Bloody Hell V say what you mean :).

Yes it looks like I was mis-lead with the advert. I took it that they would bush std 1.27 rockers to 1.5, therefore allowing the mix of 1.5 and 1.27 on one shaft...

Having a look about there is a post for a guy in Aus that offsets 1.27 to 1.3 and looking at the size I cant see how 1.5 is possible...

I thinking about a Vmax SC cam and 1.27 rockers...


Thread here -> http://www.ausmini.com/forums/viewtopic.ph...ghlight=rockers

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Graham, I was not pointing you for being misleaded but the website (just to make things clear)

What is more they are implying there is more duration wich is a real lie.

They are abusing Mini folks, that's what I am saying !

Rusty by nature