I really admire the PT engine and have 3 for my personal use.
I have always thought they were Australian designed. Do you know anything about their origin?
Hi speedy,
If you are to believe the advertising material (Below), the PowerTorque engine was designed and built in Australia and released somewhere in the mid 80's.
Regarding the main jet, I've read that they have a different number of "lines" on them, which indicates fuel flow, but I've never come across them. Not that I've noticed anyway. Is that the correct way to identify them?
Hi Mystyler,
To identify the jet in use, please see the images below. Note that the rings refer to the raised sections on the face, not the grooves. Based on the parts manual and the figures noted next to them, it's a fair assumption that the purpose of the different jets are to allow different mL/Min flow rates which should relate to additional fuel, power, and RPM.
So I guess a Power Torque is a Power Torque. If you swapped over some simple parts you can essentially get "full" power from the things. I'm also guessing that a PT2 does not share a whole lot of common parts with the other PT motors, reading the above post by pau13z.
Some of these parts are interchangeable, however, that doesn't mean the mower will run as designed, or have the emissions that are expected, etc. As I understand it, the current carby replacement available is the same carby that comes on the VE series of engines, which should be backwards compatible with other PowerTorque engines. The question is, what main jet, poppet valve setting, and diaphragm spring, do you use to get the correct settings for the mower in question? The carby replacement I refer to is part number CR03773A.
More information on the creation of the VE series of engines can be found at the Museum of Applied Arts & Sciences -
https://ma.as/364560As I'm aware, there were several revisions of the PowerTorque Engine. You have the original V series (V40/V50), then there was the V160/VS160/VSX160, then there was the VE series (VE40/VE50/VEX60).
I'm sure I'm missing a lot of model numbers here so please, if anyone has additional info, share it.
As I understand it, the VSX160 was the newer more powerful engine which was released, and the modifications which I listed in my post above to the various engine and carby components allowed it to keep or increase the power output while reducing emissions. This is why the name changed from the VSX160 to the VEX60.
The crankpin can be different depending on the chassis and blade setup. Something else I forgot about, depending on the model of the mower and if it's a residential 2-stroke or commercial 2-stroke, is the inlet manifold shape. Higher powered models have a straight manifold, lower powered models have a bent manifold.
Hope this helps
Cheers,
pau13z
