That sounds good!Originally Posted by Flettner
Muddler/Dabbler.
That sounds good!
Strokers Galore!
Forum whore
Might have to go all LPG fueling on its ass, bugger it.
I won't run petrol, E85 seems like its out now. Green NZ, yeah right.
Might be a bit awkward fitting an LPG bottle into an enduro bike. What pressure is LPG, 80 PSI ?
LPG might have excellent cooling properties for the hot end of my OP uniflow engine though.
Muddler/Dabbler.
Think it was 145psi last time I looked (for LPG). - that's the trouble with bikes - no space!
Strokers Galore!
Forum whore
LPG, bad idea.
Pressure too vairable, according to outside temp, although the Link could be programmed to change the master fuel depending on fuel pressure / temp but too much hassle.
Anorak
LPG might provide the HCCI though from memory it will not compression ignite until well after diesel does.
people used to use it much like a mild form of nitros in turbo diesels as it has an intercooler effect as well.
25% power increase.
https://drivetribe.com/p/lpg-injecti...T2ClxmdwTz3Z5w
You could direct inject a tiny amount of Diesel into the combustion chamber
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Don't worry, thats one of the many plans I have set out for this engine. Although I was wanting to use ethanol as the base fuel.
Anorak
The LPG injection its called LPG Fumigation as it was basically just misted into the air intake.
https://web.archive.org/web/20120729...ey.com/lpg.htm
The wankel i think was investigated as it works kind of reasonable with Hydrogen likely because combustion area is seperated from the other areas.
i want to see the sleeve engine.
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Neil is pressure-feeding oil directly to the big end bearings. I don't think Suzuki ever did that on their road-going two-strokes. The best I can remember was them feeding oil directly to the T500 and T750 crankshaft main bearings.
Hardcore Biker
Frits, seeing you’re so young, you mightn’t remember the Suzuki T6/X6/Hustler of the mid 60s onwards. This had the Posiforce system which fed the mains through catchment plates surrounding the main bearing outer races, then thru to the hollow crankpins to the big end. The T500 & GT750 had this, and I think, more feeds into each intake.
"Success is the ability to go from one failure to another with no loss of enthusiasm.”
Forum whore
I remember those, Ken. But the centrifugal effect in these catchment plates can only build up a small amount of pressure, depending upon the diameter of the cachtment plate trenches and on crankshaft rpm. There is no relation between the oil pump pressure and the tiny pressure with which the oil enters the hollow crankpins. I do not consider this pressure-feeding the big end bearings.
Hardcore Biker
Yeah, fair enough Frits. I guess it comes down to some form of definition as to what pressure fed means. I would think that it means, a high oil pressure feed to suit plain bearings, eg like every auto 4 stroke. Given this, a pressure fed big end would be unsuitable for a crankcase scavenged 2 stroke due to the relatively high flow rate of oil thru the bearing, so agree with you re road going 2 strokes.
It would be interesting to know if, ultimately, did this directed flow to the big ends, offer an improved life to the bearing.
"Success is the ability to go from one failure to another with no loss of enthusiasm.”
Muddler/Dabbler.
I remember very well indeed (just more or less as you described it Ken ...... except I didn't see your post - but I'll confirm that!) - the T20 (Hustler) had the oil pumped to the mains (low pressure, of course - more of an adjustable trickle than high pressure fed of course, being through ball bearings). There was a sheetmetal collector at the inside of the bearing (like a big washer with curled over outer edge and had a rolled tube extension going up into the hollow crankpin, the (oil being fed in by centrifugal force - and quite considerable force too I would think!). The big end was then fed through a hole from the crankpin (like any common or garden four stroke) - it was much more sophisticated than the Yamaha Autolube system! and quite an innovation - I thought so anyway!
Strokers Galore!
Forum whore
In the case of the Suzuki catchment plates I have no solid knowledge, but in any case, if I had one of those Suzukis, I would keep the system operational.
In the case of real pressurized feed of the kind that Flettner is using, the knowledge is there: Helmut Fath built it on the Yamaha racers of Phil Read and claimed 'about a tenfold increased lifespan'.
It was a more sophisticated system than the Yamaha Autolube system, allright. But not quite an innovation; BMW used these metal oil collectors on all their twins long before Suzuki did. I am sure I wrote about the BMW system not too long ago - just can't remember where it was.
Before we dismiss the Yamaha Autolube system, let's realise that it was developed for affordable street bikes. Yahama had already demonstrated in the 1960's that they knew how to provide proper pressurised lubrication for their race bikes.
Hardcore Biker
I'm sure someone has posted this somewhere, but this is the latest attempt at a clean diesel two stroke. At 1000 hp it's a little big for your car, though.
https://www.caranddriver.com/feature...piston-engine/
Lohring Miller
Muddler/Dabbler.
Reminds me of the "Tecalemit" multi point machine tool lube system! (On the Yamaha GP bike).
I would never dismiss any of these ideas (especially the Suzuki T20 etc.) which we should have really paid more attention to! - it was very simple and effective.
Recently, someone mentioned this "new, revolutionary oiling system" somewhere on ESE - it was being well recieved and I couldn't believe that no one seemed to know about it previously! ...... it was then I noticed just how old I was becoming!
In my days of "T20-ing" those doing serious racing with them actually abandoned it and went back to petroil mixture - not sure why but it seemed to be because of adjustment of the low pressure pump which I guess if set incorrectly could be the cause of piston seizures (the adjustment of the pump did both cylinders together (no individual adjustment) - but I'm sure that someone here knows a lot more than I do!).
In it's heyday, the T20 was raced by a lot of guys (stock and all looked the same) and I remember seeing about eight of them all parked up in the paddock waiting for the call for the next race.
To fill in the time I decided to check my gearbox oil level and I was busily removing the oil plug when I heard this voice behind me "ahem, - excuse me - are you trying to sabotage my bike?" .......
Yeah that engine was inspired by the Junkers Jumo (so says the guy in charge) - and he probably knows more and has more experimental data collected on that layout than than just about anyone else on the planet! - the fact that the big companies are seriously interested (and involved in its development) says a lot!
Now we've got to miniaturize it a little!
Strokers Galore!
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