[DeTomaso] Oil Numbers

[Tomas Gunnarsson]

Asa Jay,

I assumed that you rebuilt to factory specs, hence you use the factory recommended hot viscosity with any type oil. If you decide to deviate from those specs you're on your own! :-) As a side note I don't think bearing clearance alone dictates an oil viscosity. If you increase pump capacity pressure/volume wise you should be able to run a thinner oil. The increased pump capacity will of course cause additional considerations...

Tomas

----- Original Message ----- 
From: <asajay at asajay.com>
To: <detomaso at realbig.com>
Sent: Wednesday, July 01, 2009 11:11 PM
Subject: Re: [DeTomaso] Oil Numbers


> Okay, so how do I know what grade of oil to run, if I'm my own builder  
> and I don't know the relation between clearances and oil viscosity?
> 
> Asa Jay
> 
> Quoting Tomas Gunnarsson <guson at home.se>:
> 
>> I'd say no change at all. The viscosity is measured the same way   
>> with mineral and synthetic oils AFAIK. If your engine builder says   
>> use a 20W50 I see no reason why you shouldn't be able to use a   
>> mineral 20W50 or a synthetic XXW50 oil. Or the other way around, you  
>>  build an engine the same way for a mineral or synthetic oil of a   
>> given (hot) viscosity.
>>
>> My 2c...
>> Tomas
>>
>> ----- Original Message -----
>> From: <asajay at asajay.com>
>> To: <detomaso at realbig.com>
>> Sent: Wednesday, July 01, 2009 10:37 PM
>> Subject: Re: [DeTomaso] Oil Numbers
>>
>>
>>> Which brings up an interesting question.  For those of us hicks who
>>> tend to build our -own- engines.... how do I know what oil is best to
>>> use with what clearances?  If rebuild an engine to factory specs
>>> (clearances), then I would assume the factory recommended oil.
>>>
>>> But, what if I want to run a synthetic?  How does that change the
>>> clearances influencing oil grades?
>>>
>>> I'm dumb on these things... that's why I ask all the questions.  :)
>>>
>>> Asa Jay
>>>
>>> Quoting JDeRyke at aol.com:
>>>
>>>> In a message dated 7/1/09 9:46:32 AM, teampantera at yahoo.com writes:
>>>>
>>>>> I think the time to discuss engine clearances and what oil to use with
>>>>> your engine builder is BEFORE you put oil in a new
>>>>> engine....especially if he
>>>>> is providing an engine warranty....
>>>>>
>>>> Absolutely correct. For example, an engine clearanced for 5W20 synthetic is
>>>> not going to last long with 20W50 dino oil, and the other way around won't
>>>> work either. Go with the builder's recommendation. No one else   
>>>> knows exactly
>>>> what's in your engine- and if he doesn't have a specific recommendation,
>>>> find another engine builder.   My 2¢- J Deryke
>>>>
>>>>
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