Forum whore
Have some more pictures (no, I won't show you what the port layout is)....
Oh, in the workshop, we have a new "Joke"........
"Der Kurbelwelle Gehäuse ist nur inen platz fur benzine und luft gemish laden........"
(In English)........
"The crankcase is just a place to store the fuel......"
No, it is not.
I really know what I am talking about here guys.
Forum whore
SS90, Good to see some pics. Interesting to see what others are up to. I like the look of the cut down mean as Scotter Racers I see at Mt Wellington, just like the bare frame look of the Atom Car.
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Forum whore
no the fuel tank isOriginally Posted by SS90
the crankcase is where you store the fuel air mix
"Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
“Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower
Forum whore
Running the risk of repeating myself, but.
The crankcase IS NOT JUST A PLACE TO STORE THE AIR FUEL MIXTURE.
Anyone who thinks that's what it's primary role is, (to store the air/fuel mixture) then they would be better off racing model trains.
One important fact I have clearly pointed out previously is that the crankcase is actually part of the intake maninfold.....
This is a BASIC fact that anyone who wants to tune a two stroke engine must know.
I used this example (which was posted by Prospeed) because it is clearly an incorrect statement, and I use it not to ridicule him, but it's just an example of how alot of things are being missed (the basics), in the quest for more power, at the expense of temperature.
I tried to point out about pumping efficiency (and how the mods to teezee's engine had lowered this to less than the industry established 1.5:1, therefore DECREASING it pumping efficiency more.
This is in addition to the 24mm carb (as per the rules) causing even more pumping losses.
Does anyone know what a "scavenge pattern " is?
If anyone does, please post a) what a "scavenge pattern" is, and b) how they effect your engine.............
I tried to point this out, even by giving details of a "closed loop" system......which almost every two stroke is....... but no-one seemed to care.
Fair weather rider
Hi SS90, so we can compaire apples with apples would you please tell us how many CC's your 25HP motor is.
We run a very usable air cooled 100 which we are confident is making 18Hp, others are getting 23+ but much more peeky.
Our 18hp 100 equates to 180 bhp per Liter whats yours?
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Forum whore
Yesssssss so you keep telling us, we are bored with it.
How about something that shows us you understand what you have read!
Forum whore
Oh, in the workshop, we have a new German Joke. aboutthe monkey.
Forum whore
Sure.
the 25hp motor is 125cc
the 28hp 140cc
There are several other cylinders available on the market to suit the same engine, and the best is 30hp, (and that's the 125cc one!) "Plug and play" (which admittedly is a nicasil coated cylinder, and VERY well designed)
Check out this.....
http://www.falcracing.it/cilindrivespa.html
This guy developed a cylinder, that has now turned into a series (long strokes, short strokes, different bore size).
Also builds VERY fast RS125's as well.
Are people getting 23+ P.S with a 24mm carb?
Do you have some dyno runs you can post?
It's a valid point about rideability..... I'm not really a "scooterist", I just like the opportunity it provides, but the best "tuned scooter" I have ridden was only 23 P.S and 20 NM. But the damn thing made peak power for about 3500 RPM.
There is plenty of scope for getting more power (especially with the Nicasil cylinders), but you are hampered by the fact you only have 4 gears, and there is a big "jump" in the ratio from 3rd to 4th.
The thing you ask anyone who has a high H.P engine, is "does it pull 4th?"
You can change primary drives, but it makes them too "revvy" for day to day use.
I spent alot of time with port design (and too many exhausts to count) to get a good balance of power and torque (in the low R.P.M), as early results where very good (as far as peak power went), but it was too "Peaky" to be nice to ride.
Forum whore
Thats animal abuse I'm telling the R.S.P.C.AOh, in the workshop, we have a new German Joke. about
The crankcase is also where you store all the broken bits from the engine as well as the air fuel mixforgot that part
did you see the pics I put up of the bike in action ???
tell ned kelly he needs more knee sliders
"Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
“Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower
No8 Wire Extraordinaire
The basic idea I'm sure everyone is aware of, it is in every 2 stroke book, probably even Roy Bacon's old duffer books. To get a visualization run some water through the bottom of the transfers & see where the flow is directed, - this of course is not a full dynamic model but is interesting & with later designs how this has evolved & how effective the kicks have become esp in the 2ndries. Where this flow ends up & how effective it is in containing charge by reducing kinetic energy & purifying what is left will all affect the result. Overboring or sleeving will put this to pot a bit wrt to transfers.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
no it's not you dope
it goes like this
tz can I have your old frame
how about your old engine
can I have those slicks
I need some rims to fit the slicks 2
you dont realy need that seat do you
can i borrow some gas (and oil)
I need a new spark plug you got any spare ????
Keep your hands off Scott they are mine
now thats how a bucket racer scavangessome of us even look in the crankcase for lost bits and pieces
I found some roller bearings between the crank bearing and oil seal on the rg50 the other day (a spare engine not my good one) havent found a use for them YET!!!
now where can I find a decent pipe from
"Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
“Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower
Forum whore
Originally Posted by SS90
. . .
Does anyone know what a "scavenge pattern " is?
If anyone does, please post a) what a "scavenge pattern" is, and b) how they effect your engine.............
I tried to point this out, even by giving details of a "closed loop" system......which almost every two stroke is.......
but no-one seemed to care.
Not true! SS90, TZ350 answered that a while ago and even gave them their correct name.
Quote:- from TZ350
"Jante Patterns do you know what they are SS90 if not, you can find examples of them on P182 The High-Performance Two-Stroke Engine. Dr John C. Dixon."
TZ350 also recently posted a link to a site that discribed all the various two stroke designs.
SS90 your not keeping up! do make an effort to stay with the programe.
No8 Wire Extraordinaire
no it's not you dope
it goes like this
tz can I have your old frame
how about your old engine
can I have those slicks
I need some rims to fit the slicks 2
you dont realy need that seat do you
can i borrow some gas (and oil)
I need a new spark plug you got any spare ????
Keep your hands off Scott they are mine
now thats how a bucket racer scavanges
I found some roller bearings between the crank bearing and oil seal on the rg50 the other day (a spare engine not my good one) havent found a use for them YET!!!
now where can I find a decent pipe from
. . . yes I think TZ had been preconditioned for a few years as well, something along the lines of "Can I have some more pocket money I've run out" "Can I borrow the car" and so on.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
Cosmic Corner maybe
Good example here of looking outside the square re scavenging, trade me is another good but more expensive scavenging technique
Forum whore
You got kids too then F5?
Kids, they are great scavengers, mine send me loopy.and they know a thing or two about transfering wealth from my pocket.
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