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Messages - Uniflow

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General Two Stroke Talk / YZ 250 EFI
« on: September 19, 2013, 03:50:50 AM »
I thought I was using an Ignitech EFI ( ordered through Wobbly ) but it appears they might be no more! Wobbly's ordered is now five months old and no news. Not even contact from Emails. They have taken the money for the order. Unfortunate as it seemed like it might have been a good unit.
We will stick to the LINK ecu at the moment, we now have total control over injection timing.

This is totally off subject but my own YZ now has a Rekluse clutch in it, with a left handle bar rear brake. Foot brake is totally gone ( for old people with a worn out right hip ). It's a bit like a mountain bike with both leavers on the handle bars operating front and rear brake. Much better entry to the corner control. 

General Two Stroke Talk / YZ 250 EFI
« on: September 03, 2013, 10:20:05 AM »

Wayne Blackwood, right, with his YZ250EFI and some other guy hanging around we couldn't get rid of!

General Two Stroke Talk / YZ 250 EFI
« on: August 14, 2013, 09:25:02 PM »
Not stock, FMF pipe, V force reeds and one of my toroidal heads but other than that it's stock, no cylinder work. 
Yes the flywheel has a 12 minus 1 pin setup ( eleven pins and a gap ) on it, the -1 ( missing pin ) is to give the computer a heads up that it's done a turn and is ready for another cycle. The computer not only counts the pins but also the time between them so at kick over there can be potential miss calculation. The moment it fires it will correct itself. The gap does not necessarily have to be at TDC as you can tell the computer the degrees from the gap to TDC, it will sort itself out. There are many ways around this but an Ignitec was an easy fix as I have them spare on the shelf, better spark too. 
The LINK is a good computer but this new Ignjet should do as well at a much cheaper price, we will see. It's taken an unbelievable time to get hold of one, the order has been in for months.
Write a book, I hate writing!

General Two Stroke Talk / YZ 250 EFI
« on: August 14, 2013, 07:25:21 AM »
Ha Ha Ha, sell the idea to Yamaha, their NZ technical guy seems not even interested. It's been waved under his nose. They are not interested!
That's the encouraging thing about this " conversion" there has been almost no problems. I made the throttle drum too good a fit and sometimes the throttle would hook up for a moment, not nice going into a corner with trees everywhere. Giving it a little clearance has fixed that problem. I gave the head too much compression ( if some is good, more must be better ) but that was quickly rectified, my fault. We have broken two kick start shafts now with the original ignition ( through the LINK ), at kick over the computer looses count of the flywheel pins and gets mixed up and then fires at the wrong time. We fixed this by fitting an Ignitec and using the LINK for fuel only. I made a new kick start shaft out of EN39B and case hardened it. Something else will bust now because the shaft never will anyway there is no kick back problem now with the Ignitec. I'm waiting on an Ignijet computer to try out, this should do the same job out of a much smaller package and much smaller price! That's about it, ride it in the rain, doesn't bother it. We are using a crude oiler system still, runs 60 to 1 oil in the fuel plus after 60% throttle a small valve opens to a fixed jet in the throttle body.

General Two Stroke Talk / YZ 250 EFI
« on: August 14, 2013, 12:40:39 AM »
Yes it runs real well. They are different to ride, my standard one feels a little sharper up to about third / half throttle but then the EFI one doesn't hit as hard when coming on the power. Same top end power. I hate to compare but the EFI bike feels more 250F ish but just more power, everywhere.
In saying this Wayne has just today changed the injection timing peramaters and it's crisper at the up to third / half throttle now. Still way more to be learned about this transfer port injection.
Citabjockey, I too am astounded at how clean the engine runs throughout it's rpm range with so little tuning time. I'm sure this tells us that transfer port injection is the way to go, short of full DFI. Remember we are getting an approx 14% fuel saving under the same conditions, this must point to less fuel short circuiting out the exhaust port.
Racer X, any time, just come on down, winter is best time although there are good rides on throughout the year. Summer is generally too dry to allow forest rides.

General Two Stroke Talk / YZ 250 EFI
« on: August 13, 2013, 09:35:41 PM »
Thank you Dave for putting video up. The bike in the front is the EFI one, the one following is my standard unit. I went out and did 85 Km first on the EFI bike, and my standard one, then we did this video run, I was buggered.

General Two Stroke Talk / YZ 250 EFI
« on: August 11, 2013, 09:23:30 PM »
We have a few Trail rides completed now with the YZ EFI , no dramas, just as you would expect from a new bike off the shelf! It appears to be running at 14% less fuel burn compared to my carbed YZ, same tracks, same rider ( me ), same day. Hardly accurate enough results to go public with but this has been what we have measured so far.
Video is being edited now, just the best bits, I told Dave to edit out the crashes and low speed flop offs. It's only me riding it, no "special" riders yet. 

General Two Stroke Talk / Honda AR PDI Two Strokes
« on: August 06, 2013, 10:32:49 AM »
Make your own! Don't bother with the big guys, if they don't want to play, who cares.
TM the YZ will be at Epic Events this week end, see you there? Saturday.
It's got a new toroidal head. Haven't tried it yet. 

Non-Moto / 2 Stroke diesel
« on: July 28, 2013, 08:39:30 AM »
Uniflow charged cylinder, in one end, out the other.

General Two Stroke Talk / YZ 250 EFI
« on: July 24, 2013, 09:09:23 PM »
Both bikes will be at Maddix park Tauranga this Saturday afternoon. This time the Go Pro will be charged, card empty, ready to go! 

General Two Stroke Talk / YZ 250 EFI
« on: July 22, 2013, 04:18:28 AM »
Ironically the Kawasaki 350 had this system originally with oil going through the right hand main ( and rotary valve housing ) then flung out to a tin centripetal thing bolted to the crank, caught the oil being flung out  and feed it into the bigend pin. Then on to the rollers via a hole leading out. I tossed all this out years ago, what were they thinking, I thought :D.  What was I thinking!
I had it in my head to use a small brass tube sticking out of the crank case wall, just missing the bigend as it came around so any oil dribble off the end of this brass tube had no choice but get taken in by the passing bigend slot.
The Kawasaki does not need this as everything seems to be coated in oil inside the crank case, 55 hours now, still no problems bigend or otherwise.
The new engine ( 360 ) will need to be more sophisticated, perhaps using one of the systems above as it will be injecting into the cylinder.

General Two Stroke Talk / YZ 250 EFI
« on: July 21, 2013, 09:14:20 AM »
No unfortunately, it will be a bit of both but overall should be less oil heading out the exhaust. 

General Two Stroke Talk / YZ 250 EFI
« on: July 21, 2013, 08:32:31 AM »
No, twostroke design stays the same, just directing the lube oil straight to where it's most needed ( first ). The problem with the bigend is it not only needs oil but more importantly it needs cooling from the rollers rubbing on the cage. Modern cages are silver plated to minimize friction and maximize heat dispersion away from the rollers edge. Fuel is a good cooling agent but so is air ( perhaps not quite as good ) but with oil ( the normal amount that would be run through pre mix ) pushed straight into the bigend and air, it's effect is nearly as good. Well so far so good anyway. Main bearings are easily sealed off from the crank case and can run in there own oil bath.

General Two Stroke Talk / YZ 250 EFI
« on: July 21, 2013, 07:56:00 AM »
The YZ is using a small jet into the intake stream just behind the throttle body. It's programed to only open after 60% throttle. Works well. Although I'm designing a smaller electric ( UCU ) driven pump, smaller than a match box for accurate oiling, this will be feed straight to the bigend.

General Two Stroke Talk / Kick and go, 380 style. Smok''in good time.
« on: July 17, 2013, 07:31:10 AM »
Funny you should say this, just tonight the apprentice and I ( after work ) had a thrash around the back yard, F9 and TT500, only for twenty minutes and just a **** little track but yes that's the way to end the day ;D

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