ok so heres the deal, i have a 1982 honda 50cc moped… i really want to do somthing cool to it. and i was thinking about turbo charging it. but then again how hard would it b to turbo a 2stroke. seeing on a two stroke both the intake and exhauast ports will be open at the same time. wouldnt the boost just flow right thru the intake? or am I wrong. does anyone have any suggestions?
this is for deiseld but good info:
Large two-stroke diesel engines are predominantly employed for ship propulsion, with only a
few being used for electricity generation in land power plants. In fact, they are now the
dominant prime mover for the world’s deep-sea shipping. Large four-stroke engines are
applied in shipping generally only to smaller vessels and to those vessels with special
requirements in power concentration or space restrictions such as cruise ships, ferries and Ro-
Ro vessels. Steam turbines remain only in the niche of LNG carriers while gas turbines have
had only a marginal position in merchant ship propulsion over the past half century.
Turbocharging diesel engines first came on to the market in the 1930s with four-stroke
engines but it took until the mid 1950s before turbocharged two-stroke engines were in series
production [1]. The first Sulzer turbocharged two-stroke engine in service was a Sulzer
6TA48 engine in 1946 in the works power house in Winterthur, while the first Sulzer
turbocharged two-stroke marine engines were a 7RSAD76 and a 6SAD72 which both entered
service in December 1956 [2].
That 20-year gap arose through the fundamental differences between four- and two-stroke
engines. In the four-stroke cycle, the gas exchange process works by filling and emptying,
with little valve overlap. Thus early turbochargers had adequate efficiency to deliver the
necessary quantities of charge air required by the then four-stroke engines.
In contrast, the two-stroke cycle is a gas flow process. The working processes of intake,
compression, combustion, expansion and scavenging must all be completed in one engine
revolution. Instead of clearing the combustion gases by piston displacement as in the fourstroke
cycle, in the two-stroke cycle they must be blown through by the scavenging air during
the overlap between scavenge and exhaust openings. There needs to be a clear pressure drop
between the scavenge air and exhaust manifolds to obtain the necessary flow through the
cylinder for good scavenging. As a result, two-stroke engines call for greater efficiency from
the turbocharger than four-stroke engines to deliver the required larger air quantity for
scavenging while having comparatively less exhaust energy to drive the turbine.
Thus, it took some years of development before turbochargers were available with sufficient
efficiency for large two-stroke engines, and for the engine builders to develop the techniques
for matching engine and turbocharger. This co-operation between engine builders and
turbocharger manufacturers is a crucial aspect of modern diesel engine development.
Throw a small bottle on it.
yeah, so I read it… and I gained nothing.
- Finding a turbo small enough to run off 50cc engine would be tough to spool enough to get power. I remember some article guy having enough trouble getting one small enough for a 400cc quad. Then again it would need to push much as your feeding that monsterous 0.05L of displacement and two-strokes are pulling/pushing air twice as often as a four-stroke.
- :tspry: Go from 3hp to 5 or even 6HP! Not only that but a 5lb bottle would probably last most of the day in that thing.
- EDIT: Thinking of wrong engine series.
naaaws ftw
5 shot would get er movin good 
WARNING: DANGER TO MANIFOLD
foot peg falls off
lol… @ peg self destruct.
BTW - leaf blowers have been proven to make power.
ask HRK about leafblowers… We had a blower running in my Nissan pulsar, the one that now resides in the woods of Buffalo Ski Club.
2 strokes have no oil pan, therefore you would need a separate oiling system for the turbo. Turbo + 2 stroke is virtually impossible because fuel distribution in a 2 stroke, just put a bottle on it
we were also tryin to figure this out for intense98rt’s 400cc 2 stroke polaris quad…external oil pump of some sort…cant figure anythng else out for the fuel though…using a k03 turbo
2 stroke top ends need no oil. its not fair to say they all dont have an oil pan/oiling system. 2 strokes with transmissions have an oil pump and regular oiling system just like anything else. its just that none of it goes into the cylinder.
Curious as to what 2 stroke has crankcase oil? Cause the crankcase and cylinder ports on a 2 stroke are connected. All 2 stroke bottom ends I have ever seen are roller bearing and a lubricated by the fuel/oil mixture
i think he’s thinking oil injectoin thats cheating i prefor to mix
Every two-stroke bike I’ve owned had crankcase oil. Completely different from the oil injection system. I’m with BIGHANDS about the premixing, leaves less to go wrong that way.
i dont know much about bikes, but i do know a lot about 2 strokes since ive been working on marine motors for a long time. i know that some marine motors have oil tanks that hold the oil(gets mixed through oil injection). (Oh and i agree, i have an oil injection system but its not hooked up and the alarm for it is disconnected. i prefer to mix). But i dont think that the oil ur thinking of is neccessarily crankcase oil. Its either tranny or its a resivior for the oil injection.
go to a motorcycle dealer, ask the salesman to show you where you put the transmission oil on the 2 stroke dirt bikes. (bad example, salesmen are usually morons and probably dont even know). but anyways…i know how a 2 stroke engine works, ive rebuilt them so many times i cant even count. im saying not all have no oil. yes they dont use any oil in the cylinder/crankcase, but if they have a transmission ie: like most motorcycles do, they have a fully sealed and OILED transmission with an oil pump. and if you read what i wrote carefully, youll see i made no mention to it having ENGINE oil.
i was more reffering to fuzzyfish’s post where he explicitly says “crankcase oil”. but yeah i think we are all just confusing terms, i think by crankcase he means transmission. right?
so back on topic, can u use tranny oil to lube a turbo???