[Alpines] oil pressure relief valve

[Jarrid Gross]

On 2/18/2015 9:47 AM, Jarrid Gross wrote:
> David,
>
> The insides of the OP valve develop ridges inside as the piston 
> rattles inside.
>
> A ridge on the dump side of the piston will result in a hang up of the 
> piston and result
> in low OP at low RPMs.  A ridge on the spring side of the piston can 
> prevent the OP from
> opening which results in a pressure spike at higher RPMs.
>
> The article wants you to inspect and perhaps even ream/deburr  the 
> bore to prevent these obstructions.
>
> Others through time have put brass liners in the bore and even changed 
> the piston material
> to something other than steel (on steel).   Reaming the bore smooth 
> and oversize, then making a brass
> piston to fit seems like a good solution to an otherwise unserviceable 
> part.
>
> Long wearing items like an OP valve usually are made of significantly 
> different hardness materials
> to prevent wear related failures such as happens on these valves.
>
>
>
> Hope this helps you find a solution.
>
>
> Jarrid
>
>
> On 2/18/2015 9:12 AM, D W Spearing via Alpines wrote:
>> Hi,I read the article which you mentioned and modified the valve to 
>> regulate
>> the pressure at 55psi several years back and it worked well. The 
>> problem that
>> I recently had was that the pressure went high and destroyed the 
>> gauge!  I
>> really need to pull it apart (when the temp warms up) and see what 
>> blocked the
>> valve closed; I suspect parts of the cheap pistons which broke. Thanx 
>> for the
>> thought.
>> ~~~~~~~~~~~~~~~~~David Wm Spearing
>>   kb9csw at juno.com
>> ~~~~~~~~~~~~~~~~~
>>
>> ---------- Original Message ----------
>> From: Mary and Ron  Tebo <mrtebo at shaw.ca>
>> To: D W Spearing <kb9csw at juno.com>
>> Cc: alpines <alpines at autox.team.net>
>> Subject: Re:oil pressure relief valve
>> Date: Tue, 17 Feb 2015 15:34:05 -0700
>>
>> Dave:
>>
>> With regard to your other question about the oil pressure relief valve,
>> I seemed to recall an article, years ago, by an Alpine racing owner who
>> even made an adjustable oil pressure relief valve, and I thought that he
>> would be the one to advise you on what you need. Unless my memory is
>> faulty, it was Jarrid Gross, the same poster that just replied on the
>> pistons! Glad to see that you are still around, Jarrid!
>>
>> Ron Tebo
>>
>> On Tuesday17/02/15 8:51 AM, D W Spearing via Alpines wrote:
>>> Hi,Thanks to all who answered my request for piston information.
>> Motorcycle
>>> pistons, an interesting thought.  John's pistons, I once had a set - 
>>> I can
>> not
>>> find them on the internet.  Yes, I am a ham radio operator.
>>>
>>> ~~~~~~~~~~~~~~~~~
>>> 73 de Dave KB9CSW
>>> ~ ~ ~ ~ ~ ~ ~ ~ ~
>>> David Wm Spearing
>>>    kb9csw at juno.com
>>> ~~~~~~~~~~~~~~~~~
>>> ____________________________________________________________
>>> How Old Men Tighten Skin
>>> 63 Year Old Man Shares DIY Skin Tightening Method You Can Do From Home
>>> http://thirdpartyoffers.juno.com/TGL3141/54e363c060d6363c01d73st03vuc
>>>
>>> ** alpines at autox.team.net **
>>>
>>> Donate: http://www.team.net/donate.html
>>> Archive: http://www.team.net/archive
>>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/alpines/mrtebo@shaw.ca
>>
>> ** alpines at autox.team.net **
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Unsubscribe/Manage: 
>> http://autox.team.net/mailman/options/alpines/jarrid_gross@earthlink.net