106
General Two Stroke Talk / Re: Online Magazines
« on: March 23, 2017, 02:56:05 PM »
These guys have an interesting, often amusing every-man take on things.
http://tractionerag.com/
--Ron.
http://tractionerag.com/
--Ron.
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Like the Phoenix rising from the ashes Two Stroke Motocross is reborn!
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107
General Two Stroke Talk / Re: Transfer Port Injection
« on: March 21, 2017, 01:43:43 PM »
I am going to try to get KTM to let me ride one!
I'm not holding my breath mind you.
--Ron.
I'm not holding my breath mind you.
--Ron.
WOW... holy chit... I will be watching intently to see how they perform...
108
General Two Stroke Talk / Re: Transfer Port Injection
« on: March 17, 2017, 07:48:49 PM »
I was talking to a KTM dealer service manager today who seemed to know a bit about the new system.
I asked about how they are going to oil it. He said oil injection straight to the bearings, but I have to think they are going to need to do some kind of mister system for the small end bearing / piston / rings.
How did you deal with the oiling?
--Ron.
I asked about how they are going to oil it. He said oil injection straight to the bearings, but I have to think they are going to need to do some kind of mister system for the small end bearing / piston / rings.
How did you deal with the oiling?
--Ron.
109
General Two Stroke Talk / Re: Transfer Port Injection
« on: March 16, 2017, 02:27:43 PM »
While the money would be nice, it has to be a bit rewarding to have the design validated at that level.
--Ron.
--Ron.
110
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 13, 2017, 09:06:12 PM »
Okay, I think I got it. I am familiar with expansion chamber theory so no argument on it doing most of the scavenging work.
If I understand correctly you are saying that the exhaust pressure will be positive when the fuel charge is introduced and the fresh air charge will help hold the fuel charge above the exhaust ports when the exhaust pressure goes negative.
Yes? Maybe?
--Ron.
If I understand correctly you are saying that the exhaust pressure will be positive when the fuel charge is introduced and the fresh air charge will help hold the fuel charge above the exhaust ports when the exhaust pressure goes negative.
Yes? Maybe?
--Ron.
111
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 12, 2017, 02:31:14 PM »
I'm trying to wrap my head around your port/flow description. Do you have a diagram?
I am having a hard time understanding how the fuel charge is going to be prevented from short circuiting out the exhaust. If it swirls as it reaches the top of the combustion chamber as is desirable to keep the fuel in suspension isn't it going to come back down into the air stream headed out the exhaust ports?
--Ron.
I am having a hard time understanding how the fuel charge is going to be prevented from short circuiting out the exhaust. If it swirls as it reaches the top of the combustion chamber as is desirable to keep the fuel in suspension isn't it going to come back down into the air stream headed out the exhaust ports?
--Ron.
112
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 09, 2017, 09:22:00 PM »
So I was thinking about your fuel delivery challenge.
What about something like a Lectron carb with a metering rod? Machine the slide so it just acts as a guide for the metering rod and only creates minimal restriction.
--Ron.
What about something like a Lectron carb with a metering rod? Machine the slide so it just acts as a guide for the metering rod and only creates minimal restriction.
--Ron.
113
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 07, 2017, 09:59:30 PM »
Cool. It ran away at the end there huh?
The spray gun as a carburetor substitute was an interesting approach, did you do that for better control?
The spray gun as a carburetor substitute was an interesting approach, did you do that for better control?
114
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 07, 2017, 04:24:32 PM »
The theoretical side of engine dynamics has always been something that I have been interested in, your lucky you live on a different continent or you'd have me lurking around your shop all the time 
That's pretty damn cool. I will go hunt up the video.
--Ron.
That's pretty damn cool. I will go hunt up the video.
--Ron.
115
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 07, 2017, 12:27:05 PM »
Wow, you do get up to some interesting things.
Is the HCCI design similar to what Honda was calling Activated Radical Combustion back about 20 years ago? Where is switches between SI and CI at a certain RPM?
That Kawasaki is awesome. Good thing your racing organization is not like AHRMA, those guys have a rule against everything. I think next they will be requiring period correct spoke nipples to go with there existing rule about having to run fanged rims.
Is the HCCI design similar to what Honda was calling Activated Radical Combustion back about 20 years ago? Where is switches between SI and CI at a certain RPM?
That Kawasaki is awesome. Good thing your racing organization is not like AHRMA, those guys have a rule against everything. I think next they will be requiring period correct spoke nipples to go with there existing rule about having to run fanged rims.
116
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 07, 2017, 10:48:01 AM »
Thanks, this is the kind of stuff I wish I had a full enough skill set, and a big enough budget to tackle, so I find it fascinating.
It is also interesting to see how much hasn't changed now in 2017. There were several post with speculations that EFI would be stock on the 2015 bikes. Now of course we know that hasn't happened outside of OSSA's trials bike.
Back around page 6 in this you had pictures of case half forms for a rotary valve intake if I remember correctly.
Did you end up making those?
It is also interesting to see how much hasn't changed now in 2017. There were several post with speculations that EFI would be stock on the 2015 bikes. Now of course we know that hasn't happened outside of OSSA's trials bike.
Back around page 6 in this you had pictures of case half forms for a rotary valve intake if I remember correctly.
Did you end up making those?
117
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 06, 2017, 01:33:27 PM »Yes Fletther and Uniflow are one and the same. Crazy bugger with a dodgy hip.
Okay then, I guess I don't need to let him know!
I would be interested in where this project went though.
118
General Two Stroke Talk / Re: YZ 250 EFI
« on: March 03, 2017, 07:14:31 PM »I'm here, just not so often these days. Thought this TSM had died, nothing seemed to be happening. Fire away.
It did die actually, Charles wasn't doing backups so I had to go to some somewhat extraordinary means to recover it.
This topic about the EFI YZ project is how I found the site way back when. Uniflow says in there somewhere that he was using this site to document the project and so I wanted to let him know that I had gotten it back.
So is Flettner Uniflow? or do you know how to get a hold of Uniflow?
Thanks for checking in either way, we are working on generating more traffic here to hopefully get the discussions flowing again.
--Ron.
--Ron.
119
General Two Stroke Talk / Re: YZ 250 EFI
« on: February 27, 2017, 05:27:41 PM »
Anyone know how to get in contact with Uniflow? He doesn't have an e-mail address listed with the board.
I would like to let him know that I was able to recover this thread and see what happened with this project.
--Ron.
I would like to let him know that I was able to recover this thread and see what happened with this project.
--Ron.
120
General Two Stroke Talk / Suzuki bringing back the RM125?
« on: February 19, 2017, 11:36:10 AM »
At Loretta's last year Suzuki had what many believe to be a prototype RM125 engine in a 250Z chassis along with a petition for people to sign to get it to production.
Of course no further word from Suzuki on this, but no surprise there.
David Pingree had this to say in his Racer-X ask Ping section:
"About a year ago I was talking with one of the media members at Suzuki and they told me they were working on this project. I don’t know if the bike at Loretta’s is the same one, but Suzuki had built a prototype 125 utilizing a 250F chassis. They told me at the time they were pushing to get the bike back into production but they needed help from Stefan Everts, Mike Webb and fans worldwide who were hoping for the bike to return. It sounds like there is a petition to sign with the display and maybe, just maybe, that will help to get the Japanese company moving. The bike looks rad but only time will tell if it actually hits the production line again.
PING"
What do you think? Would they sell? Is the beginning of a sea change in the MX world, or just another cool project bike that will never see production?
--Ron.