A7SS valves and guides

[Wrinks]

Best guides ? What material to go for.

[berger]

 there is colisbro or manganese bronze.

[limeyrob]

You will see I've posted a rather similar question about my A10.  I've done a lot of searching around and found that the +2 and +4 bronze guides seem to be out of stock everywhere except Australia which is not much use to me. But SRM have stock on the +14 Colisbro at close to the same price so I've ordered those.  The local engine shop will clean up the head bores and turn the guides to suit.  I'll report back on costs.

[Wrinks]

Thanks for that. I am considering the valve and guides kit from Draganfly, no decision made yet.

[chaterlea25]

Hi Wrinks,
I dont know if  drags valve guides are bought in from some reputable company or made by the same crowd that make their engine and gearbox bushes?
My experiences with their engine and gearbox bushes is just plain Bad

John

[Wrinks]

Thanks for that.

[limeyrob]

Drags are back order on the A10 +2 and + 4 guides which is why I went for the +14 from SRM.
I've just fitted a Drags TS bush, it fitted well and since it has to be bored the accuracy of the inner face is not critical.  But I did notice it was poorly de-burred and I spent some time de-burring the holes and edges, but this seems par for the course nowadays.

[sean]

Best guides ? What material to go for.

if you go with colisbro the id needs to be honed with a diamond hone you can not ream them  tolerances I got from SRM were .001 on intakes and .0015 on exhaust still breaking my motor in but no problems .

[limeyrob]

Thanks!  My head will be at the machinists in a week or two and I will mention these dims

[sean]

funny thing with SRM they sell the guides but dont sell the hones or know where to get them  ........I got mine through a company called brush research in USA I believe they have a place in UK.

[limeyrob]

The place the head will be going to specialize in racing Austin Minis and A35s so I'm hoping they have all the gear, certainly looks that way.

[RichardL]

........I got mine through a company called brush research in USA I believe they have a place in UK.

Found their site. That's an interesting company.

Richard L.

https://www.brushresearch.com/

[fffcycles]

I used their hone on my latest rebuild of a TR25 engine for a friend. Easy to use and worked out well
Frank