[Healeys] valve guides

[Austin Healey]

Yes it does. The material has to expand somewhere. It cant go in the
oposite direction.

g

2015-03-28 20:12 GMT+01:00 Michael Salter <michaelsalter at gmail.com>:

> 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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