[Healeys] valve guides

[Michael Salter]

Hi Gergo,
just so I'm clear...you are suggesting that the internal diameter of the
guide will get smaller as it heats up therefore that extra clearance is
required?
Michael S

On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <pajtamuvek at gmail.com> wrote:

> Bronze guides expand more when they heat up. Thats why You have to use
> greater clearance. But when they work, the clearance will be the same. Worn
> out guides have two negative side effects: oil consumption, and premature
> wear on the valves as they dissipate heat slower due to rocking on the
> valve seat. The exhaust guides are more prone to oil consumption, exhaust
> guides are more prone to overheating.
>
> Gergo
>
> 2015-03-27 20:01 GMT+01:00 Michael Salter <michaelsalter at gmail.com>:
>
>> Hi Raymond,
>> The factory specification calls for 0.0025 to 0.0015 clearance for the
>> inlets and 0.002 to 0.001 clearance for the exhausts if you are using cast
>> iron guides however if you are using bronze THAT WILL NOT WORK!!!
>> To be safe with bronze guides you will have to hog them out to about
>> 0.006" clearance..which means there is really no point in replacing them.
>> I would point you to this article
>> <http://www.netbug.net/blogmichael/?p=384> on my blog...been there done
>> that...
>>
>> Michael S
>> BN1 #174
>>
>> On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <rjsmithson at shaw.ca>
>> wrote:
>>
>>> I am rebuilding my 3000 cylinder head and have found the inlet valve
>>> stems have .008" clearance but the exhaust stems have only .002" clearance.
>>> Does anyone know if this is common?
>>>
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>>
>>
>> --
>> *If you can't fix it with a hammer, you've got an electrical problem.*
>>
>>
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>


-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
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