50cc World Speed Record - 144.891 mph!

[Fredriksenboatsport]

Wow!
That is cool. Nice speed

[Original Looper 1]

Here's the link for the USA distributor for some of the performance parts used on this remarkable 50cc world record engine.

Link: http://www.metrakitusa.com/


Enjoy the possibilities.



thanks,
Paul A Christner

[Mark75H]

I don't see the answer to my question. I find no pricing on that web site.

[Speedfab]

I don't see the answer to my question. I find no pricing on that web site.

Sam, we have done machine work and engine assembly for a couple guys whith those Aprilia RS50s who bought Metrakit parts... The crank assembly is $300, the cylinder kit is almost $400, their pipe for it is almost 500... not cheap stuff by a long shot, but the parts are like little jewelry, really nice.

The cylinder has typical high perf Schnuerle porting, 5 transfers (but the front "boost port" is split/has a bridge in the middle, meaning technically there are six) and one big unbridged exhaust port with two smaller "eyebrow" ports at each upper corner (so 3 total exhaust ports in the liner). One thing I did notice is that the ports seem huge relative to the size of the cylinder, which is obviously tiny. The port timing is very similar to what we ran in K30 Komets in unlimited sprint karts.

Really amazing power out of a tiny engine, no doubt.

[Seagull 170]

Perhaps the hardest part is going to be lowering the revs,to a suitable range without the use of a huge crownwheel or by using a sexy planetary reduction box somewhere in the leg.

Unless Ron has come up with a prop design that will work at 15,000 + revs!

When you look inside one of these cylinders you start to wonder how the head stays on with so many ports, what holds the top to the bottom.

Some of the top hand built 2.5cc model aero engines are producing around 900 hp per litre, at up to 40k revs.

When we're trying to get 2 hp per inch these guys are almost getting 1 hp per cc. Respect!

[Mark75H]

Current 500 & 700 motors are making 6 or more ... 180+ from 30 ci ... still a long way from 1 hp per cc ... it might point the way for future race motors

[bandit]

True, water is like going uphill, even if your flying a hydro its still in a constant state of climb & it needs to start out, then theres no gears. Besides a few mini bikes the 1st 'real' motorcycle I rode was a friends Honda 50. It was surprising how well it would go. Later on a Suzuki 750 GT.. it would have to have been pushed real hard to go that fast. The 144.891's amazing- no joke about it.

I think it sounds like a great power to wheight thing but it doesnt have anything to do with boat racing.

[bandit]

I don't see the answer to my question. I find no pricing on that web site.

And thats all i'm gonna say about that.

[Seagull 170]

you might find prices on Malossi or Jasil's web sites.

All of these companies provide bolt on extra power, for kids to use on their twist & go scooters.

As for boat racing use just check out the 125 & 250cc classes & the speeds they get

[Rotary John]

I seem to recall Honda raced a twin cylinder 50cc 4-stroke in the 60's. Ran 22,000 RPM and beat the 2-strokes of Yamaha and Suzuki.