ESE's works engine tuner

[TZ350]

Water in Petrol everyone knows water and petrol don't mix .... ..... or do they ....

Everyone knows Diesel and water don't mix either. Ok, I am not sure about Petrol and water but the US IRS offers a Tax refund to operators who use Diesel with water added to it so it may be possible to add a little water to petrol too for combustion control and anti detonation.

http://www.irs.gov/publications/p510/ch02.html
Diesel-Water Fuel Emulsion http://www.irs.gov/publications/p510...link1000116965

[richban]

Not many 2 strokes entered for boxing day at the cemetery circuit but this will be on the streets making the right noises. Should be fun.

[F5 Dave]

It'll feel strange to be cheering you on, but now you're on the good side -Go Rich.

[TZ350]

.

Yes ... Go Rich.

We look forward to hearing how it went.

[wobbly]

Tested water injection when working at ZipKarts on Hines champ winning Rotax Superkart 250s.
We put a powerjet on the old magnesium Dellorto 38s and used an rpm switch to turn on water injection around peak power.
We mucked about for ages trying idiot ignition advance, and compression as the Pommie rules were 91 pump gas way back then.
No matter how much com or advance I tried I couldnt blow it up, it didnt make more power though either.
But it didnt run that long, and a big end locked up, the rod broke off near the small end and sawed the case and a cylinder in 1/2.
Oh dear, must have been running too long on the dyno.
But no, put on another new engine, ran it in, did some baseline runs, then back into abusing the shit out of it.
BANG, another rod went west.
Looking at the big end bearing we found the oil was mixing with the water spray and turning into non lubricating white muck - end of test, my shout
of warm beer and pork scratchings for lunch at the local.

[Drew]

Tested water injection when working at ZipKarts on Hines champ winning Rotax Superkart 250s.
We put a powerjet on the old magnesium Dellorto 38s and used an rpm switch to turn on water injection around peak power.
We mucked about for ages trying idiot ignition advance, and compression as the Pommie rules were 91 pump gas way back then.
No matter how much com or advance I tried I couldnt blow it up, it didnt make more power though either.
But it didnt run that long, and a big end locked up, the rod broke off near the small end and sawed the case and a cylinder in 1/2.
Oh dear, must have been running too long on the dyno.
But no, put on another new engine, ran it in, did some baseline runs, then back into abusing the shit out of it.
BANG, another rod went west.
Looking at the big end bearing we found the oil was mixing with the water spray and turning into non lubricating white muck - end of test, my shout
of warm beer and pork scratchings for lunch at the local.

But direct injected to the combustion chamber 10 degrees before ignition, would that achieve the desired effect?

[peewee]

If the main Ex is at 72% and 200* then you have no choice but to add Blowdown STA by widening the top of the Aux.
In this case the positive Blowdown power tradeoff is a desireable one against a small amount of port linking power loss.

200 ? at 190 with the large aux the STA lines up well with A at 128 and B/C at 130, (B is widened as far as it can go). seems like at 200 there would be a large mismatch of the STA unless the transfers were sky high or am i missing something here ?

[Larry Wiechman]

TZ, do the rules allow methanol? If so, you might cure deto, aid cooling and maybe find a little more power.

[F5 Dave]

We're on pump av at best

[Drew]

What was the concensus as to water injection all those pages ago? Water injection is water cooling, and not allowed for a 125?

[TZ350]

What was the consensus as to water injection all those pages ago? Water injection is water cooling, and not allowed for a 125?

It was water injection into the intake that the RRC thought would constitute water cooling. Water injection into the exhaust was not discussed and is probably a technically different thing as its purpose is to change the resonant time of the pipe.

[TZ350]

The horse is having a rest .... yer right!



26 hp and repeatable, but so fiddly to get and still detos like mad, however much fuel I throw at it. All the extra fuel does is make more exhaust smoke.



Green line is where we were at the beginning of the week, changed the end point, increased the logical injector size, increased/decreased the Alphan N map but with transfer port injection its just not going to equal the carb. I think there really is just not enough time, 1.8ms for the injection cycle through the transfers at 12krpm.

Ok time to change over to injecting down the inlet tract.

[Larry Wiechman]

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[dark art]

26 hp and repeatable, but so fiddly to get and still detos like mad, however much fuel I throw at it. All the extra fuel does is make more exhaust smoke.



Green line is where we were at the beginning of the week, changed the end point, increased the logical injector size, increased/decreased the Alphan N map but with transfer port injection its just not going to equal the carb. I think there really is just not enough time, 1.8ms for the injection cycle through the transfers at 12krpm.

Ok time to change over to injecting down the inlet tract.

What about trying to lower max rpm range without loosing power? Will it be too hard on the air cooled engine? Or just loosing power?

[TZ350]

What about trying to lower max rpm range

That is a good thought but the carb graph is the performance baseline, to progress I need to better it in rpm and torque throughout the original rpm range.