13 replies to this topic

[Azz_169]

Hi guys

My 91 cooper 1275 tappets are incredibly noisy under load is it worth me upgrading these for some from mini sport and what needs changing and what do the different ratios represent

Cheers

[Dusky]

No. You only need to set the gaps and the noise will be gone ( if nothing is badly worn or broken, but that's normally not the case).

[Azz_169]

Ok will try that first cheers. But say I wanted to upgrade to some aluminium roller rockers 1.5 ratio would there be anything else to change and would they be compatible?

Thanks

[Osgodd]

curiously  whats the best gap to set for a set of roller rockers...

[cal844]

Id adjust the standard units instead bof buying 1.5 ratio, as the gains at the top end are lost elsewhere

[Azz_169]

Ok. How do you adjust to get the gains?

[cal844]

Ok. How do you adjust to get the gains?

There is no way to gain the losses back in my opinion, if i were you, id adjust the tappets (i cant remember the figure) the car will be alot quieter!

[sledgehammer]

Just to confirm - you are getting oil up there ( it won't be gallons , but you should see flow)

 

as above , check the fingers of the rockers arn't worn too much (opposite end to the ball),

 

as they will affect the gap when you measure with a feller gauge

 

(appologies for the spellin - spell check has run orf with tha antivirus again)

 

 valve lash.bmp   231.31K   160 downloads

 

red is the feeler , black is the real gap

Edited by sledgehammer, 27 June 2014 - 03:41 PM.

[Dusky]

Ok will try that first cheers. But say I wanted to upgrade to some aluminium roller rockers 1.5 ratio would there be anything else to change and would they be compatible?

Thanks

Get 1.3 ratio rockers. 1.5 rockers will give more bhp, but only at the top end & will lose bhp and torque at the bottom end ;)

[Azz_169]

Cheers guys going to spend a morning in the garage see what I can achieve

:)

[Captain Mainwaring]

Cheers guys going to spend a morning in the garage see what I can achieve

:)

 

 

A morning? you can probably respray it too

Doesn't take long to set the clearances.

[Cooperman]

You said the tappets are noisy 'under load'. Now tappets are either noisy or they are not. They can't become more noisy as the load on the engine increases. They might seem noisier as the revs increase, but not as the engine load increase.

If there is a metallic noise when the engine load is increased it might be 'pinking', which means too much ignition advance. If so, this needs to be rectified immediately.

[Azz_169]

All sorted the tappets were not correctly set. I looked through the reciepts a and found a rocker assembly one so I can only imagine that they have replaced them but not set them up correctly there was an extra .4 gap on them re done them sounds miles better. Nearly ran my foot over thought whilst rocking the car ha ha

Edited by Azz_169, 04 July 2014 - 09:22 AM.

[sledgehammer]

nice to get an easy fix  ;o)