The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: mikeb on 04.08. 2015 01:53

Title: on an A10 SR are colsibro valve guides worth the money
Post by: mikeb on 04.08. 2015 01:53

i know colsibro has less wear, longer lifespan and sounds super duper tho I'm bleeding money on a full rebuilt and wondering if they are actually a significantly better materials for valve guides on an A10 super rocket. they cost twice as much as bronze. do they influence what valves to buy? surprisingly i can't find any discussion of this on the forum.

any views/experience?

thanks

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: unclerob on 04.08. 2015 11:06

This might be of interest....
http://cylinderheadshop.com/valve-guides/

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: muskrat on 04.08. 2015 11:13

G'day Mike.
Never used colsibro guides but the blurb on them looks good.
I use these ones  http://valvetrain.kpmivalvetrain.com/viewitems/orcycle-valvetrain-components-bsa-a10-br-1962-1970/br-1962-to-1970-valve-guides-for-bsa-a10-1960-1970?
Cheers

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: chaterlea25 on 04.08. 2015 12:53

Hi Mike,
My SR has colsibro guides with seals fitted on the inlets,
they run very tight clearances,
They have given no issues in 20K + miles
I have fitted out several other BSA + Tri engines with Colsibro guides from SRM and all these have been good

Cheap guides can suffer from lack of concentricity which means excess cutting of the valve seats

Theres a thread on valve guides / fitting on Britbike forum
John Healy's posts make interesting reading
http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=607630#Post607630

Buy cheap buy twice *sad2*
John

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: mikeb on 05.08. 2015 01:31

thanks for the comments all.
John - can you tell us more about the seals? are they fitting the srm colsibro guides?

cheers

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: chaterlea25 on 05.08. 2015 13:21

Hi Mike,
The guides need to be modified to fit the seals,
Straight forward job with a lathe,
I seem to remember that the seals are late Triumph ? T140?

HTH
John

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: Viking on 10.08. 2015 09:59

Yes, it is worth the extra cost.

I have a BSA A10 SR with RGS tuned engine, and have the valve conversion done by the cylinderheadshop i Wembley i 1996 !

Works very well !

No oil smoke of valve problems after 19 years after 30K use.

Viking

Title: Re: on an A10 SR are colsibro valve guides worth the money
Post by: a101960 on 10.08. 2015 11:15

Quote

I have a BSA A10 SR with RGS tuned engine, and have the valve conversion done by the cylinderheadshop

Had my head done by The Cylinder Head Shop too. A good result send your head there with confidence.
John