Valves capable of unleaded fuel are a must these days.
What many people do not realise is that only the exhaust valves need
changing. So if the original inlet valves are OK and not worn they can be
reused or replaced with standard valves not expensive stainless steel ones.
One tip I learned many years ago to improve gas flow was to reduce the
contact sealing area of each valve, even to the point of creating a radius
on the valve rather than a flat seal between valve and cylinder head.
While you are at it I would open out the cylinder head to reduce the valve
seats to about 1/16th of an inch.
The valves from Rimmer are stainless steel and are perfectly OK.
I paid #6.00 + VAT GBP for mine from TR Bitz. (I guess this is about
$9.00/10.00 USD) each and as an export item you would not be required to pay
UK VAT @ 20% extra. TR Bitz are an excellent company for new and used items.
NFI of course.
Adrian TR4A CT64306 O
Wales UK.
----- Original Message -----
From: <diggle at clear.net.nz>
To: <triumphs at autox.team.net>
Sent: Tuesday, July 19, 2011 4:00 AM
Subject: [TR] Valves
> First I'd like to thank the replies to earlier questions.
>
> I am going to remove the engine and gearbox to make the
> repainting etc of the engine bay easier. I will have a look
> at the state of the bearings and am trying to decide whether
> to fit hardened exhaust seats for the leadless New Zealand
> petrol.
> If I do I was thinking of fitting larger exhaust valves.
> Rimmers have them for about US$14 ea, has anyone tried these
> valves?
>
> Jim and the 1962 TR4
>
>
> triumphs at autox.team.net
>
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