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Cooper S tappets
https://www.ausmini.com/forums/viewtopic.php?f=2&t=38996		 Page 1 of 1
Author:  66S [ Mon Dec 24, 2007 5:11 am ]
Post subject:  Cooper S tappets
Hi guys,
Does anyone know what method of valve adjustment works best with an RE13 cam? I've tried one valve at a time, as per the BMC book but the tappets were quite noisy, so I did them in firing order, one cylinder at a time and got a much quieter result and finding a number were a little loose after doing them the first time the BMC way. I'm setting them at .017" as GR recommends.

Regards
Al
Author:  drmini in aust [ Mon Dec 24, 2007 6:11 am ]
Post subject: 
I do them the way GR recommends, the rule of 9 (modified).
eg when #1 valve is wide open adjust #8, etc. This puts the one being adjusted right in the middle of the cam lobe's base circle.

`modified' means when #8 (exhaust) is open, you will find #6 (inlet) is near open too. Just rock the engine slightly until both are 95% open, then adjust both. :wink: Repeat for the others. This way you only have to move the crank round 4 times, not 8.

You will find most good sports cams including RE13 are slightly noisier than stock cams, this is because initial valve acceleration is faster- which increases performance. You can't have everything-

BTW my RE282 cam runs .022/.024" (recommended) clearance with 1.5 forged rockers, and yes I can hear them- just.
Author:  66S [ Thu Dec 27, 2007 5:07 am ]
Post subject: 
Thanks Dr Mini,
As you suggest is the way I have been doing them but I have noticed that there are a couple that remain quite noisy. If I do them by getting the opposite cylinder rocking, I find I can tighten them a little and the engine sounds sweet and there is no notable decrease in power. The fact that I am tightening them makes me wonder if by doing it your way, I am not completely on the back of the cam lobe. I suppose it's up to me to make the choice but I do appreciate your thoughts and help.

Regards and thanks
Al
Author:  smac [ Thu Dec 27, 2007 5:30 am ]
Post subject: 
Are you doing them hot or cold?
Author:  66S [ Thu Dec 27, 2007 5:38 am ]
Post subject: 
I'm doing them cold, dead cold.

Al
Author:  drmini in aust [ Thu Dec 27, 2007 5:57 am ]
Post subject: 
Check that your rocker bushes & shaft are not worn. If they are, you get funny results when setting.

BTW, I found S forged rockers are the worst of the lot for rocker ratio & valve lift- even worse than those crap late model A+ sintered ones.. :lol:
Author:  66S [ Thu Dec 27, 2007 7:07 am ]
Post subject: 
drmini in aust wrote:
Check that your rocker bushes & shaft are not worn. If they are, you get funny results when setting.

BTW, I found S forged rockers are the worst of the lot for rocker ratio & valve lift- even worse than those crap late model A+ sintered ones.. :lol:


The rocker bushes and shaft and valves and guides have only done 5,000 miles and the rockers were faced, so everything is like new. The rockers are forged S ones and I checked to see that nothing had picked up and made a rocker loose. I did the initial set-up as GR suggested, with a dial gauge onto each valve but they were close enough that I could do them as per your suggested method, so all is well there.

Regards
Al
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