• Welcome to the forum website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Online Forum Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this forum website.

    If you have previously registered to use this forum website, you should log in now. CLICK HERE.

    If you have never registered to use this forum website before, please CLICK HERE.

Looking for necked down nitrided/tuftrided exhaust valves

johnmead

Well Known and Active Forum Website User
Non-VOC Member
I am looking for a pair of new exhaust valves (ET33) that have the stem necked down between the head and where it would meet the valve guide. I have a pair of new intake valves with the necked down stems and lightened heads that are tuftrided. Package says they were made in the UK.

I got the intake valves from Coventry Spares here in the US, but they are out of stock on the exhaust.

John Mead
 

johnmead

Well Known and Active Forum Website User
Non-VOC Member
HI JOHN

Been awhile since we talked, are you sure you want t neck down the ex ?
Why not? I have successfully used them in the past. The valves you got for your liner from Spare Parts Germany should be necked down if they are the same as he sells. I know because I bought a set from him in 2012.

John Mead
 

Kansas Bad Man

Well Known and Active Forum Website User
Non-VOC Member
Just wondering, I have a couple of new old stock valves I would send your way no cost that's all.

Cheers

excuse the spelling
 

johnmead

Well Known and Active Forum Website User
Non-VOC Member
Just wondering, I have a couple of new old stock valves I would send your way no cost that's all.

Cheers

excuse the spelling
Thank you for the offer Max. However, I already have stock exhaust valves. I will give John at Coventry a call and ask him where he got his valves from.

John
 

johnmead

Well Known and Active Forum Website User
Non-VOC Member
I checked with John Healy at Coventry and he said he got the valves from Ron Kemp. I emailed Russell and he said that the person that made the valves for him is no longer doing it.

Does anyone know where I can get some lightened exhaust valves?

John
 

Kansas Bad Man

Well Known and Active Forum Website User
Non-VOC Member
You could take the stock valves to a machine tool grinding service and show them what you want. Then send them to (Advanced Heat treat corp) they have 3 locations in the states, they will heat them up in a bath of ammonia and there you go, GAS NITRIDID VALVES.

cheers

excuse the spelling
 

johnmead

Well Known and Active Forum Website User
Non-VOC Member
You could take the stock valves to a machine tool grinding service and show them what you want. Then send them to (Advanced Heat treat corp) they have 3 locations in the states, they will heat them up in a bath of ammonia and there you go, GAS NITRIDID VALVES.

cheers

excuse the spelling
Thanks Max. I just dropped 4 new valves off at the machinist along with a lightened one for him to copy. I will stop at a couple of engine shops that do NASCAR work and ask who they use for nitriding.

John
 

greg brillus

Well Known and Active Forum Website User
VOC Member
While we're on the subject, can you use big block Chev valves to make larger valves to fit a Vincent...? I need standard exhausts, but larger inlets with a head diameter of 1.925 This is about 1/8th larger OD than standard. I think the BBC valves have a stem of 0.372 I also want to raise the step half way up the stem by 0.080 and extend the upper stem by 1/4 of an inch. This is due to the cams I am using with radiused followers, which have a lift of about 0.433 of an inch or about 11 mm. I am using Gold Star springs, retainers, and modified upper guides to suit. Any thoughts..? Cheers.....Greg.
 

vibrac

Well Known and Active Forum Website User
VOC Member
Let us know how you raise the E24 caps to give you clearance to the spring retainers and can you still have clearance to the UFM or Oil spine?
Thats where I had fun with the racing twin
 
Warning! This thread is more than 9yrs ago old.
It's likely that no further discussion is required, in which case we recommend starting a new thread. If however you feel your response is required you can still do so.

Top