ESE's works engine tuner

[TZ350]

Oil in injectors.

How well do injectors deal with 2 stroke oil? .... does the old premix gas go through the injectors without clogging them ....

My 2 stroke fuel injection ran 20:1 oil mix. No problems with the oil fouling the injectors or my O2 sensor. But not sure what it will do to any catalytic converters or O2 sensors long term.

[TZ350]

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I have been playing with my rotary valve converted Suzuki RG50's inlet timing. Rotary valve timing was changed and ignition and jetting optimised for each run. Everything else the same.



Red line inlet timing, opens 135 btdc closes 75 atdc. Blue line inlet timing, opens 145 btdc closes 85 atdc. So more is not always better.

[wobbly]

You are dead right TeeZee , but 145 opening is too much for " any " engine , and the results are skewed by the fact that any 50cc race engine making 13Hp at only 12,500 is
not even in the ballpark yet.

[lodgernz]

https://www.youtube.com/watch?v=utEKKox2WHA[/video]

My father's solution to slightly misaligned shafts was a chain pulley on each shaft, with a piece of double-row chain around both. Worked well.

[Grumph]

My father's solution to slightly misaligned shafts was a chain pulley on each shaft, with a piece of double-row chain around both. Worked well.

See my post on the previous page.

This chain on sprockets joiner is traditional in speedway TQ's where a driveshaft comes off the end of a bike motor crankshaft.
Still in use today.

[Flettner]

Yes, but here in Siberia we use more safe and practical machines like

My friend is owner of company which produce such toys and sell a lot each month

I have a bit strange question.
Anyone have an experience to connect 2 crankshaft by some type of couplings which allow small misaligment like 0.05mm?
may be Oldham will work for?

Practical?

[karter444]

You are dead right TeeZee , but 145 opening is too much for " any " engine , and the results are skewed by the fact that any 50cc race engine making 13Hp at only 12,500 is
not even in the ballpark yet.

Hi Wobbly at what angle BTDC does a reed valve start to open . Im guessing that it depends on rpm and load ??
cheers

[ken seeber]

My 2 stroke fuel injection ran 20:1 oil mix. No problems with the oil fouling the injectors or my O2 sensor. But not sure what it will do to any catalytic converters or O2 sensors long term.

From what I can remember at Orbital, the catalyst, particularly, was affected by 4 stroke engine oils cos they contained both zinc and phosphorous. These are use in the 4T oils because of the EP (extreme pressure) requirement, I guess at the camshaft and followers.

So, from this, 2T oils don't contain the additives and are therefore fine with a catalyst and one could reasonably assume the O2 sensor.

We had no issues in this respect.

[F5 Dave]

Cool. Old premix will go in van. I dont have a lawnmower. Thanks.

[wobbly]

The Lambda O2 sensors are affected by oil ( and we were told - lead ) residues coating the element. We discovered in SKUSA racing with CR125 stock classes
that if it was put into a hollow threaded bung in the very front of the muffler with its tip just short of the perforated , it lasted for years and the readings were very reliable/stable.
Stuck in the belly we had nothing but problems with reliability and inconsistent readings.

Yes , Rotary Valve timing is based around rpm and the STA required to generate the power needed at that rpm.
A few examples I have knowledge of - 300/400/600cc Jetski cylinders running up to 9500 - open 130 to 132 close 65 to 75 depending on the tune , the early Rotax 256 that
made about 40 Hp/cyl at 12200 , open 134 close 86 ( or 88 if tuned higher to 12500 ) and of course the RSA ( plus the modern 250 Superkart clones ) that make 50 - 55 Hp at 13,000
opened between 140 and 142 and closed at 90 to 92 ( depends upon who you believe ).