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General Two Stroke Talk / YZ 250 EFI
« on: June 24, 2013, 09:22:59 AM »First dyno run on the YZ 250 EFI.
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First dyno run on the YZ 250 EFI.
32
General Two Stroke Talk / EFI Bighorn
« on: June 24, 2013, 08:16:28 AM »
Ran the old girl on a dynajet dyno Sunday, not too bad, exhaust is only 186 degrees open time. Cut off is rev limiter cutting in, fueling is not too far off. This is rear wheel HP.
Did a run with the YZ 250 EFI as well.
33
General Two Stroke Talk / YZ 250 EFI
« on: June 19, 2013, 04:31:42 AM »
I did consider building 360 cylinders for the YZ250 but have been told from several different people ( who should know ) not to bother, couldn't make it cost effective enough. It's only a hobby and not worth the time, there are other kits out there ( 300 cc ish ), my kit would cost more.
Yes, I'm concentrating on getting this NEW 360 engine finished. This is not a production engine, it's a one off to test all the bit's of technology I've developed from the F9, EFI YZ250 and a few other engines I've worked with. IF all goes well I would produce them for others, but they won't be cheap!
Lets concentrate on getting this first one up and running. Patterns are heading off to the foundry Monday so might have some heat treated case castings to look at by the end of next week.
Yes, I'm concentrating on getting this NEW 360 engine finished. This is not a production engine, it's a one off to test all the bit's of technology I've developed from the F9, EFI YZ250 and a few other engines I've worked with. IF all goes well I would produce them for others, but they won't be cheap!
Lets concentrate on getting this first one up and running. Patterns are heading off to the foundry Monday so might have some heat treated case castings to look at by the end of next week.
34
General Two Stroke Talk / YZ 250 EFI
« on: June 10, 2013, 01:12:09 AM »This Epic Events ride was a lot of fun.
Thanks Dave for the photos.
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General Two Stroke Talk / KTM Fuel Injection.
« on: June 09, 2013, 08:22:12 AM »
Yes! had to stop for a pee, ( Taupo trail ride ) in the weekend, F9 has no stand so I just lay it on the ground, no fuel leaks out and starts first kick when we are " refreshed " and ready to go again. Good old EFI.
36
General Two Stroke Talk / YZ 250 EFI
« on: June 09, 2013, 07:42:04 AM »
Good, thank you.
I know this is not what you want to hear, more excuses, the YZ 250 EFI is running well, but we have not had a decent chance to get video. Weather has been bad or finally got sorted for this Saturday's Epic Events trail ride in Taupo , Owner ( Wayne of Blackwood Yamaha ) has just been too busy selling bikes and couldn't make it on Saturday and Sunday pissed down again! We have had a fuel pump bugger up ( made in china ) that slowed us down for a while until it was realized what had happened. New computer has not arrived yet ( the one that costs less that half the Link ) so haven't had a chance to look at that yet. But we have discovered that the Link can vary the end of injection timing, through an overlay table, so we are working though this now.
I did attend the Saturday ride with the F9 ( and the new injection timing software ) and proceeded to tune it into a rocket. I have looked at putting this engine in a modern frame but it's just too big and would need a frame change and I'm not willing to do this to my alloy 250F frame. Work is still proceeding with the YZ360 cases ( to fit the 250F frame ) but it is slow. Too much fun riding the F9 in the weekends.
I know this is not what you want to hear, more excuses, the YZ 250 EFI is running well, but we have not had a decent chance to get video. Weather has been bad or finally got sorted for this Saturday's Epic Events trail ride in Taupo , Owner ( Wayne of Blackwood Yamaha ) has just been too busy selling bikes and couldn't make it on Saturday and Sunday pissed down again! We have had a fuel pump bugger up ( made in china ) that slowed us down for a while until it was realized what had happened. New computer has not arrived yet ( the one that costs less that half the Link ) so haven't had a chance to look at that yet. But we have discovered that the Link can vary the end of injection timing, through an overlay table, so we are working though this now.
I did attend the Saturday ride with the F9 ( and the new injection timing software ) and proceeded to tune it into a rocket. I have looked at putting this engine in a modern frame but it's just too big and would need a frame change and I'm not willing to do this to my alloy 250F frame. Work is still proceeding with the YZ360 cases ( to fit the 250F frame ) but it is slow. Too much fun riding the F9 in the weekends.
37
General Two Stroke Talk / 2 stroke 500cc electronic fuel injected eingine in a 2012 YZF450 frame
« on: May 26, 2013, 02:47:33 AM »
Yes, development costs, even for me, It's just an out of control hobby.
We have been waiting on a good ( fine weekend ) day to do more track work with both YZ's, my carburettored one as well. Video cameras are at the ready.
Hoping to get this " flash" rider to ride my F9 as well ( he hasn't seen it yet
)
We have been waiting on a good ( fine weekend ) day to do more track work with both YZ's, my carburettored one as well. Video cameras are at the ready.
Hoping to get this " flash" rider to ride my F9 as well ( he hasn't seen it yet
)
39
General Two Stroke Talk / Courtney Duncan WMX at Hangtown Qualifies 1st on a YZ 125
« on: May 19, 2013, 09:19:11 AM »
Wow, good on her. Never under estimate a well ridden 125. ( Yamaha ).
40
General Two Stroke Talk / YZ 250 EFI
« on: May 19, 2013, 09:12:14 AM »
Overrevn, It's expensive, approx $1500 NZ Dollars for the Link computer alone. I am looking at another supplier at less than half this cost but I'll probably be the first to use this prototype. Should have a unit to test in about two weeks. This new unit has the necessary software to run transfer port injection, apparently, we will see.
No claims on HP until we see a dyno.
No claims on HP until we see a dyno.
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General Two Stroke Talk / YZ 250 EFI
« on: May 16, 2013, 08:37:01 AM »
No, that's winter attire. When are you coming up to have a ride on the YZ TM? You might have to swap for a go on your 300.
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General Two Stroke Talk / YZ 250 EFI
« on: May 15, 2013, 08:28:37 PM »
Yes, at least I had a helmet on, we take our test riding very seriously. Next time I'll use a clean tee shirt!
We know our marketing
very seriously. Next time I'll use a clean tee shirt! We know our marketing
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General Two Stroke Talk / YZ 250 EFI
« on: May 15, 2013, 10:13:52 AM »
Why not indeed? What do they cost? I emailed them and got no reply?
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General Two Stroke Talk / YZ 250 EFI
« on: May 14, 2013, 09:30:40 PM »Probably not possible to have a phone app run injectors. Uniflow will correct me if I am wrong but that requires an operating system that specializes in "real time" operations. There needs to be a very direct connection -- with no delay -- between what the CPU wants and the device being controlled as well as in the other direction from the sensors to the CPU. With windows,linux,android etc OS there are many layers that let the computer do many things at once but none of them with real time response. Humans are slow enough that we don't notice it but an injector sure would.
That said I am sure the components on that link computer are pretty darn cheap on their own and fabbing a special purpose board is not that pricy. Its the software NRE that costs the vendor plenty. If enough units are sold then its easy for the price of the whole shebang to come down. But any manufacturer building a bike that gets into mass production is probably going to end up building their own system so development systems like this link are not cost effective either -- and stay that way.
Uniflow -- for your system, how many inputs and outputs are you using? Ambient temp and pressure? O2? throttle position? Rpm (and/or crank position)? Cylinder temp? exhaust temp? Are the only outputs for the injectors? Is there another for the fuel pump? Other outputs? And the link to your laptop -- that is USB? I still think having a WiFi or bluetooth connection with be way cool. Never even bother with a cable connection.
The Link is a versatile little unit. As well as running the injectors we have outputs for many other operations, power valve, pulse oil metering pump, more injectors timed differently if needed, shift light, cooling fan, fuel pump drive lots of stuff. We are only using one injector drive ( although that may change) and the fuel pump drive, also might add the oil pump drive. The fuel pump drive only turns the pump on when the engine is turning over so when you stop, the pump stops. You can also have up to three overlay maps running at the same time for real fine tuning, or injection start point changes. All good useful stuff.
Inputs at the moment are TPS, rpm, crank angle sensor, engine coolant, ambient pressure and chamber pressure drives the fuel regulator. I did also set up a sampling valve to the crankcase, a small valve wired to the injector drive so the computer was only able to "see" the pressure in the crankcase as the injectors fired not all the other pressures. I don't want to put anything in the exhaust that will affect the way it runs, no sensors that will protrude in. We might have the system too simple? but it seems to go alright. I'm freshening up my YZ, new piston kit, new pipe ( same as the EFI bike ) so we can get a good comparison.
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General Two Stroke Talk / YZ 250 EFI
« on: May 13, 2013, 10:55:24 PM »
Something like that is getting more and more possible these days.