Hardcore Biker
Model crankcase supercharged four strokes have been around a long time. Of course the fuel needs to be mixed with oil. They even use a simple fuel injection system and get similar power to aerobatic piped two strokes. In this application consistent, throttleable power is critical.
Lohring Miller
Muddler/Dabbler.
YS - Yes that's the engine I was talking about! - I just couldn't remember the name at the time.Originally Posted by lohring
Model crankcase supercharged four strokes have been around a long time. Of course the fuel needs to be mixed with oil. They even use a simple fuel injection system and get similar power to aerobatic piped two strokes. In this application consistent, throttleable power is critical.
Lohring Miller
However, in full size engines such as this, I bet there would eventually be opposition from the legislators (for no real reason really, but the excuse of the fuel/oil mixing etc) and of course the scant lubrication coming from the fuel/oil mix requiring expensive roller bearings.
All ok in racing of course where tearing down the engine on a regular basis is commonplace but not really viable for everyday road work.
Our minds are conditioned not to use turbocharging or supercharging (being banned in racing) and we seem to have a mental block about using that!
That doesn't apply in the above example (not supercharged), but in Darryl's idea, that is quite possible.
Cars seem to be breaking down that barrier now and I had the pleasure of trying out a couple of cars with small turbocharged three cylinder four strokes - pretty amazing really - but will they last?
Even these (unfortunately) will eventually be superceded by electric (all driven by popular demand).
I may be wrong of course, but that's the situation as I see it anyway!
Strokers Galore!
Hardcore Biker
I once did some sketches for a two stroke stationary engine, as an alternative to the B&S or the Xxxda.
It had a half speed rotary valve in the inlet so every second cycle was a direct fresh air cylinder flush.
Now add a sealed 'wet' crankcase and diaphragm case pump, we can have a simple, clean, powerful, cool running, valveless engine with about 6 moving parts.
Run it on bio-hydrogen from algae, and there's not much left to complain about.
....but some-one undoubtedly will... "SAVE the ALGAE"!
Cheers, Daryl
Fair weather rider
The Norton counter balance blurb sparked a memory of my friends Yamaha TMAX technical paper he sent me;
http://www.ekoinstal.com/skutery/Yam...on%20Guide.pdf
Nothing new in this world!!
OH, Save the Algae!!!
Muddler/Dabbler.
Darryl - I can't picture how your idea was intended to work (probably because my ability to visualise it isn't as good as it used to be!).I once did some sketches for a two stroke stationary engine, as an alternative to the B&S or the Xxxda.
It had a half speed rotary valve in the inlet so every second cycle was a direct fresh air cylinder flush........
Now add a sealed 'wet' crankcase and diaphragm case pump, ........
"SAVE the ALGAE"!
Cheers, Daryl
They are probably fantastic comfortable machines, but I'm sure they are too expensive for the average Joe Blow!
Maybe they could have employed that redundant "balancer" piston as a supercharger (or a generator)!
Yeah? - not much chance of that when we keep advertising (and selling) all those chemicals for killing it!!!
Strokers Galore!
Hardcore Biker
Yes, the original idea needed more work than I had time, at the time.
The (now redundant) half speed rotary valve would have worked something like this.
Isolating the transfer flow from the fresh air only through the boost port was an issue, not fully resolved.
But Now, with crankcase diaphragm supercharging there are no transfer passages up from the case.
The pressure chamber supplies all the transfers & boost ports.
Fuel injection could be once per stroke for full power applications or every second cycle, with a fresh air scavenge in between, for economy /cruise.
cheers, Daryl.
Muddler/Dabbler.
Some original thought there Darryl, why don't you make a rough prototype and see if it runs.
Flettner did that with HCCI and had it running! (the "suck it and see principle"). Guess the piston lube would be by splash instead of mixture?
I remember reading about a (twin cylinder) boxer two stroke engine made somewhere in England which was favoured by fishermen due to the fact that the transfers on one cylinder could be shut off at low revs, effectively making it a smooth running supercharged single, which it seems was just right for low speed trawling.
Can't remember the name though!
Strokers Galore!
Anorak
Seagull?....
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Ailsa Craig made two cylinder two strokes. Engines of various forms were produced between 1905 and 1964
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
Anorak
Kinky is using a feather. Perverted is using the whole chicken
Low personal B.M.E.P.
Mounting the Kohler into the BMW frame was, interesting....It mounts to a flat base plate. I stitched it and the box in for Dave and sorted a swingarm installation too. Last time I saw it, it had a little supercharger mounted.
Muddler/Dabbler.
No Husa, I think much bigger and better (boxer twin) and not an (emergency designed) poxy little outboard - but I've found the book it was in (it's called "Connaught") - I've managed to scan the text and pics and post them .....
There you go ..... a bit rough but all there!
Interesting project, it's always fulfilling to have something not ready made instead of a super duper "no input required" expensive thing, which won't be current next year anyway and which will have to be replaced in order to maintain "Street Cred"!
Strokers Galore!
Hardcore Biker
Well I know the Connaught Irish bar in Birmingham, but not those engines, even though I also have that book. I asked my friend, (G) and it seems Connaught was a brand produced by Bordesley Engineering Co. Ltd.No Husa, I think much bigger and better (boxer twin) and not an (emergency designed) poxy little outboard_ - but I've found the book it was in (it's called "Connaught") - I've managed to scan the text and pics and post them .....
There you go ..... a bit rough but all there!
Interesting project, it's always fulfilling to have something not ready made instead of a super duper "no input required" expensive thing, which won't be current next year anyway and which will have to be replaced in order to maintain "Street Cred"!
Muddler/Dabbler.
Probably was a small company bought out by Bordesley!
I think I bought that book in 1967 and it gave me many happy hours of reading.
It was maybe "old school" thinking even at that time of course, but it gave quite an insight into what the new technology was built on. The advanced Japanese two strokes (like the Yamaha TR2 and TR3) were about to come on the scene then and of course I was only interested in high performance engines and couldn't imagine any other kind!
However, now I have realized that more mundane stuff is the basis of it all and (as is happening with two strokes), when they are not on the roads, then no one is interested and they are eventually forgotten except by a few real enthusiasts - a shame, but the reality is, it's all driven by popular demand, profit or legislation and that normally decides what should or shouldn't exist in this world !
In my opinion!
I had never heard of "Ailsa Craig" as a company till now - I did know that it was an island (more of a large rock really) between Ireland and Scotland, often known as "Paddy's Milestone".
Strokers Galore!
Low personal B.M.E.P.
Dave's another Flettner. If he gets an idea, he builds it - though not into building engines. Sitting at his place is a small Honda twin which has Laverda SFC fiberglass on it. A perfect 7/8 scale SFC. Done as a joke as the Laverda twins were allegedly based on the SOHC Honda.
He's finishing his second Guzzi powered Morgan replica. Gorgeous.
He's got the sort of twisted imagination that made steampunk builds a natural for him too.
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