Turbo or supercharged 2Ts?

[TZ350]

I like this one because it has a donkey motor driving the blower.



Someone explaining why supercharging/turbocharging a crankcase inducted two stroke can not work, even quotes out of a book but I am not sure I agree with him myself.



http://www.theworldofmotorcycles.com...iner_50cc.html

50cc 2T turbocharged land speed record breaker.

[speedpro]

It'd be harder to change the rules than to actually build the engine. If it floats your boat just build it.

[jasonu]

Fxr150's are not air cooled.........

The fact that the FXR has cooling fins cast into the cylinder and head would suggest it relies upon the flow of 'air' to 'cool' it. Water cooled engines such as my RGKE do not have 'cooling' fins.
Along with Grumph I thought of the GSXR TQ speedway cars and how that ruling would or could be applied to Buckets.

[FastFred]

http://www.theworldofmotorcycles.com...iner_50cc.html

50cc 2T turbocharged land speed record breaker.

http://www.elsberg-tuning.dk/recordbikes.html

50cc speed records over the years.

[Yow Ling]

Oil supply would be a bit of an issue when turbing a 2t

[kel]

The fact that the FXR has cooling fins cast into the cylinder and head would suggest it relies upon the flow of 'air' to 'cool' it. Water cooled engines such as my RGKE do not have 'cooling' fins.

Yep, yet again our rules are exposed as inadequate.
I'd fully agree that an FXR is air cooled; the oils primary role is that of lubricant. Sure the engine oil passes through a heat exchanger but it’s the flow of air over the heat exchanger that cools the oil therefore the FXR is air cooled!
ps. my 2 stroke gearbox oil flows through a heat exchanger, I have no problem with this as the oil is a lubricant and my motor is air cooled.

[avgas]

The fact that the FXR has cooling fins cast into the cylinder and head would suggest it relies upon the flow of 'air' to 'cool' it. Water cooled engines such as my RGKE do not have 'cooling' fins.
Along with Grumph I thought of the GSXR TQ speedway cars and how that ruling would or could be applied to Buckets.

Anything with a "radiator" would beg to differ. FXR came factory standard with them. GSXR did also. XR/GB's did not (the real grey area). Also late British bikes vs modern(ish) British bikes.

But then again if we used your definition of fins for cooling. Doesn't that make the last "air cooled" (as in had fins just for cooling) bikes something like a CZ?

Air cooled means effectively air-to-metal. Liquid cooled means that there is some kind of liquid that is placed near the heat, its absorbed some of the heat and then removed from the heat to somewhere else to "cool", then it repeats.
So really anything that has a "radiator" filled with liquid, really should be called liquid cooled, and anything that is metal onto a metal radiator (like a "heat sink") is air cooled, and stuff that has both (fins on the block + liquid between the walls) is "Air and Oil" cooled.

Sadly we tend to abbreviate this to "air cooled" where the fact of the matter is that is only half the story. As there is a whole heat exchange process with oil. Thankfully most of this was resolved with electric engines.
http://en.wikipedia.org/wiki/Oil_cooling

[kel]

Air cooled means effectively air-to-metal.

Show me in the MNZ competition rules where I can find this definition

[husaberg]

The fact that the FXR has cooling fins cast into the cylinder and head would suggest it relies upon the flow of 'air' to 'cool' it. Water cooled engines such as my RGKE do not have 'cooling' fins.
Along with Grumph I thought of the GSXR TQ speedway cars and how that ruling would or could be applied to Buckets.

A lot of older water cooled bikes had fins Bultaco spring to mind, does that make them any less water cooled?
if you google an FXR150 in the specs it will say oil cooled, The rules say air cooled as a restriction or open type ... surely Suzuki would know.
I remember grumph saying at the time speedway got it wrong in their interpretation.......
Then again there rules way have mentioned liquid cooling or water cooling etc.......

[jasonu]

A lot of older water cooled bikes had fins Bultaco spring to mind, does that make them any less water cooled?
if you google an FXR150 in the specs it will say oil cooled, The rules say air cooled as a restriction or open type ... surely Suzuki would know.
I remember grumph saying at the time speedway got it wrong in their interpretation.......
Then again there rules way have mentioned liquid cooling or water cooling etc.......

Sounds like the rules need to be tweaked. But as Green said that might take a while...

[TALLIS]

I don't really see the problem here with rules, 150 4t air or water cooled. So dose it really mater what type of cooling you dem a fxr150 engine to be? The rules are effective for 2t because it's either air or water cooled... I suppose they are constantly oil cooled if you really wanted to get into it.

[Yow Ling]

Tallis is right, it makes no difference how it is cooled in 4t F4.



But for those who have never been isside a FXR there is an oil jet that cools the bottom of the piston, the oil that feeds the camshaft bearings dribbles down the timing chain tunnel, and the so called radiator is a tiny oil cooler. For sales purposes Suzuki calls it oil cooled . the oil pump is tiny as its only job is to supply oil to the camshaft bearings and a little dribble to the roller bearing in the big end.

[Sketchy_Racer]

Here's one to wet your appetite TZ

[Flettner]

one I prepared earlier, nice little turbo.

[breezy]

maybe this is the way to do it