ESE's works engine tuner

[TZ350]

could always use a carb until the end of the needle then inject the rest

Its a good idea, but I want to use the FI for the shorter inlet tract and when I have had it running OK low down on one injector the throttle response is much better than with a carb. At 2,000 rpm I can go WOT and it picks up without any hesitation.

FI may not ultimately make anymore top end power than I can achieve with a carb but I expect the fuel curve with FI to be much better with greatly improved drive-ability.

[Cheesy]

Are you still using a constant fuel pressure? I was reading the YZ250 EFI build thread and I think that mentioned using chamber pressure as a reference for the regulator, something like that or maybe an ecu controlled servo to alter pressure might give a betterrange on the injector

[TZ350]

Varying the pressure, thats a good idea for extending a single injector, I will try it if Ecotrons can't come up with an answer to the crossover problem.

[speedpro]

Rideability is less critical on a race bike? You haven't done much drifting lately, have you?

Not lately and not on a bucket ever. Actually, on a bucket once, but it didn't end well.

[kel]

Thoughts on my piston please.

The plug suggested it was running rich but Im thinking the piston says its too hot so should therefore be richer still? Oil is Elf HTX909 castor synthetic mix if that makes a difference

[TZ350]

Maybe posted before, can't remember so here it is, well worth reading.

Detonation Management – The Key to 2stroke Power and Reliability
a technical paper by Harry and Gerhard Klemm of Klemm Vintage Racing Engines

http://www.klemmvintage.com/deto2.htm

[TZ350]

Now that I have started putting the new air cooled motor together.



In the interests of science I have brought a data logger and 4 channel thermocouple interface from europerformance http://www.europerformance.co.nz/ who are a certified distributor for Innovate Motorsports and XT Racing and also carry other performance and race parts.



Pocket Data Logger $95 ... http://www.trademe.co.nz/Browse/List...x?id=677818916

http://www.europerformance.co.nz/pro...products_id=84

Thermocouple interface $145 ... http://www.trademe.co.nz/Browse/List...x?id=677819590



The plane is to use the data logger to help with developing some effective ducting for the new 30+ hp air cooled engine.

[koba]

Now that I have started putting the new air cooled motor together.



In the interests of science I have brought a data logger and 4 channel thermocouple interface from europerformance.

Interested to see how this goes! I've been looking to buy/build something similar.

The one I have build has a relay in it which I plan to use to earth the coil over a certain head temp during development runs.
What you have there looks to be a better off the shelf solution.

[TZ350]

One of the places that gets really hot fast is under the exhaust port duct and will be one of temperature control places for my setup.

This might be useful, $29.90



http://www.trademe.co.nz/business-fa...-679008416.htm

If it has a Peak and Hold function then it would be very useful.

[speedpro]

Thoughts on my piston please.

Doesn't look hot to me. Still looks cool and damp. How did you stop the engine - plug chop or ride it back to the pits?

[kel]

How did you stop the engine - plug chop or ride it back to the pits?

Rode it back to the pits. Im now thinking the piston should only be read as per a plug chop

I thought perhaps the black deposit to the piston was oil burn from to much heat, do I have this completely arse about face?

[TZ350]

When you get a chance, take a look at the underside of the piston, if there is carbonized oil or staining there, then its running to hot.

[Frits Overmars]

...I plan to use to earth the coil over a certain head temp during development runs.

Unexpectedly losing all engine power can be ...eh... surprising. Hooking up a warning light instead of cutting the sparks may be healthier.

[TZ350]

Ok so its not a 2T but it is an adventure and it does give you a pretty good look inside an Indian Scout.



Beautiful preparation, a lot of effort has gone into making it look good.

http://www.indianpartseurope.com/saltcracker.html

http://www.indianpartseurope.com/scbonneville10.html



They even mention Burt (The Fastest Indian) but did not get anywhere near Berts 200mph run at Bonneville.

Looking at it, I think their picture of Bert, is Bert at a Beach Race in New Zealand, 70's perhaps.



Here is a shot of Berts bike taken much earlier, 1953.

[koba]

Unexpectedly losing all engine power can be ...eh... surprising. Hooking up a warning light instead of cutting the sparks may be healthier.

Yeah it can be a fright! I plan to only do that for testing when I am the only one on track, thought about that instead of a warning light as I can't miss it then...

May revisit a warning light though.

Actually now that I've had a good run of testing on-track and on-dyno I'm not so worried, this was the plan when I was melting pistons each time I went out, I've got past that knwo with a bit more brains in setup. (Fingers Crossed)