Internal Fire Museum of Power

Hi All,

Another Petter question from me (sorry). What is the recommended liqour for use in the calibrator oiler on my Petter M? Is 20W-50 basic non-symthetic cheap oil suitable?

Also, is it adviseable to mix oil with the fuel (bearing in mind the engine is a two-stroke)? I have read some guidance that says do it, others that say don't!

In our ever improving more sustainable world where we are all making a concious effort to live our lives with reduced environmental impact, leaded (4-star) petrol is no longer available (I suspect sustainability, environment and Petter M have never been mentioned in the same sentence before!!). I assume using unleaded fuel is acceptable based on the robust nature of these engines? Is it recommended to provide a lead replacement additive in the fuel?

Any help would be most appreciated.

Cheers,

_________________
Kevin
Lowestoft, Suffolk

See my webpages here: http://www.petternut.co.uk/petter_m_type_5_text.htm
and here: http://www.petternut.co.uk/pettermtypesettings.htm
I use SAE30 or a modern 2T. Do NOT add oil to fuel. Unleaded is just fine as the engine was designed when fuel was about 70 octane and lead-free.

hth
Roland

Thanks for the help once again Roland. It's much appreciated.

_________________
Kevin
Lowestoft, Suffolk

unleaded is ok as they will run on parrafin which has no lead in it either..and sae30 oil is best but make sure its dripping the oil as it should as to much oil will foul its plug up and to litte it will run hot and melt a bearing...the oil res goes into the sump of the engine and fuel goes in the side which is why you dont need to mix the oil to the fuel..easy to see how that works if you got a manual as there is a exploded view in most of them

Sorry that's not quite right for the Calibrater models. The mains are greased ball and roller.
The oil goes directly from the Calibrater and only to an oiling ring on the crank and thence feeds the big end. After which it flirts out the sides and lubricates little ends and bore. Some goes into the fuel and is burnt (If the engine is WORKING!).
If the engine is over-oiled and/or off-load, and worse still being murdered on Paraffin, the excess oil and fuel is pumped unburnt into the exhaust pot where some mixes with the exhaust gas and is spewed out as Petterspots.
An overlong (> about 20") exhaust pipe simply exacerbates the problem by allowing unburnt fuel and oil vapours to condense and be returned to the pot. This contributes to the pot gradually filling up. Some run so full that they can be heard gurgling and will backfill the cylinder as the engine stops.

I'm really not exaggerating.


cheers
Roland

I assume filling the Calibrator oiler with 2T oil is still ok though Roland? I noticed somebody contradicting this on one of my other threads (which I see you responded too also). I have been running the engine on modern 2T oil to date without any noticeable problems.

Cheers,

_________________
Kevin
Lowestoft, Suffolk

as have many other experienced engine men who run their engines hard, long and often.
I wasn't sure what that post meant hence my interrogative.

cheers
Roland

Thanks Roland - much appreciated

_________________
Kevin
Lowestoft, Suffolk