The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Joolstacho on 04.04. 2013 11:14

Title: Dural pushrods, tappets hot or cold?
Post by: Joolstacho on 04.04. 2013 11:14

I have Dural pushrods in my SR engine, I know the steel pushrods have the tappets adjusted cold, but I have a feeling that the Dural ones should be adjusted hot. Anyone confirm or deny?
Cheers
Jools

Title: Re: Dural pushrods, tappets hot or cold?
Post by: muskrat on 04.04. 2013 13:12

G'day Jools, I do mine cold but do give them a tad more, 10 & 12 as I have had it hot enough to prop the valves.
Cheers

Title: Re: Dural pushrods, tappets hot or cold?
Post by: KeithJ on 05.04. 2013 09:20

Not seen dural pushrods. Do they have hardened steel caps on the ends?

Title: Re: Dural pushrods, tappets hot or cold?
Post by: muskrat on 05.04. 2013 09:56

I have seen them on ebay with and without hard ends. Mine are tapered with soft ends.
Cheers

Title: Re: Dural pushrods, tappets hot or cold?
Post by: Joolstacho on 05.04. 2013 10:53

Got them about 20 years ago in the UK, -(I think from Armours but I can't really remember). No steel ends, but seems to be no wear issues at all, -though I've only had 'em fitted for a several hundred k's.
They do SEEM to be a little noisy (tappity), but it may just be my imagination, or possibly the Dural is more musically resonant. ;)
I had set them 8 and 10 hot, but I'm tempted to close down the gaps a thou or two. (Mind you I'd rather have more clearance than too little).
Guess I should set them 8 and 10 hot, then measure them when cool to see what the expansion is like.