[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]

Re: [T3] 1500S pistons


On 30 Oct 2004 at 19:04, Jacin Ferreira wrote:

> Hmmm.. I could have sworn that Everett had mentioned that the 
> requirement for 96 octane wasn't correct any more.  I think this was 
> because the octane ratings have changed since '64/'65 and that today's 
> current 91/93 octane gas was more than enough for the 1500S pistons.

There's RON (Research Octane Number) and MON (Motor Octane Number.) Both are 
legitimate methods of measuring octane, but they give slightly different 
numbers. Pump gas in the US is rated at the average of these two: 

(MON + RON)/2.

I'm pretty sure this is the way it's been done in the US since AT LEAST the 
very early 70s. The stickers on early 70s VWs call out just one of these (I 
think it's RON) which is the slightly larger of the two, so a pump rating a 
couple of points lower that the filler flap calls out for will be okay.

I'm not sure, but I really don't think current pump gas will satisify a high 
compression 1500S engine. 

> How can I tell what brand they are? 

Look at the logos molded inside the pistons.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]