Buttoning a Piston

[Thegreg]

Is this a worthwhile improvement to go to the bother of doing?

Obviously if I did it it'd be done right with little spot-faces machined to hold the buttons in place.

Most of the buttons I've seen have a domed top, which as I see it would give only point-contact and wear out pretty quickly?

Interested on hearing your opinions

Cheers
Greg

[p.sharp]

They tend to wear out pretty quickly. A lot effort for virtually zero benefit 🙂

[ora8i]

Try Macarri tuning (USA) Old Fashioned Buttons they stick on and they Do Last a long time.

Ora

[Telephonepete]

Is this a worthwhile improvement to go to the bother of doing?

Obviously if I did it it'd be done right with little spot-faces machined to hold the buttons in place.

Most of the buttons I've seen have a domed top, which as I see it would give only point-contact and wear out pretty quickly?

Interested on hearing your opinions

Cheers
Greg

i have a v glide by steve pope one of the very best tuners in the country (v mach). i also have a sandwell stage 2 tune no buttoning just polishing and tuning. it was half the price and is evey bit as good. i should not bother.

[hotversion]

Are they just glued on? they look like they are,if so with what? superglue or araldite ?

[ora8i]

They are small 4mm round dots of some sort of plastic after a very thorough de-greasing they are glued on with quality super glue.

Once stuck on they stay on and can even be sanded if the overall piston diameter is too great, I found then very effective and so much less trouble than drilling the piston to fit delrin buttons.


ora

[Thegreg]

Thanks for the replies chaps

Your responses have reinforced my suspicion that they're not really worth doing!

Is the "done thing" (according to the tuning experts) to turn down the back of the piston before fitting these, so there's no chance of any metal contact?

Cheers
Greg

[Telephonepete]

Thanks for the replies chaps

Your responses have reinforced my suspicion that they're not really worth doing!

Is the "done thing" (according to the tuning experts) to turn down the back of the piston before fitting these, so there's no chance of any metal contact?

Cheers
Greg

never heard of that. i dont know what that means.

[lensman57]

Thanks for the replies chaps

Your responses have reinforced my suspicion that they're not really worth doing!

Is the "done thing" (according to the tuning experts) to turn down the back of the piston before fitting these, so there's no chance of any metal contact?

Cheers,
Greg

It is not so simple my friend. It dependson how well they were sized to the comp tube and what sort of plastic was used. In general I'd say that if you are not familiar with engineering or model engineering works then leave it alone. Some people are quite happy with metal running on metal and genrally if they are correctly lubricated then it is fine.

A.G