ESE's works engine tuner

[husaberg]

Ahh now that's where you are wrong, the US got 5 speed 50s or at least some were, our MBs were 4, or at least the ones I've taken apart were.
The H100S was 4 but all down. The MT50 was 5.

Anyway I'm done being a trainspotter, none of this seems so funny anymore.

You are right with the all down, not totally sure with the US but they only got them in 82. MT50 I forgot about but yes all were 5 only ever seen two of them.
They had longer shocks always wanted to try a pair with MB50 springs and a spacer also the frame was slightly different with a conventional tank.
I have definitely seen 5 speed MB100's normal box. Bugger all trains about here at the moment now, no coal to cart.

I had a factory parts manual for the H100S Sold it to (forgot his name) there was bugger all of them and not sure if they was a Fiche for them back iin the day.
http://www.kiwibiker.co.nz/forums/me.../21379-Hilleye

I also had the 6 speed supplement to the service manual I posted on his thread.
http://www.kiwibiker.co.nz/forums/sh...post1130185396

[WilDun]

Both: crankshaft 30.000 x 360°; piston 30.000 x up, 30.000 x down. Clear enough?

Yes, all cleared up, just a wild theory, I now can bury that one - thanks.

[teriks]

Roller bearings are for Pussies
These rods have no bearings at all. yes no bearings and yet run a whole season not only that they are 1/2 the weight of a conventional rod and 25 % lighter than titanium
http://www.mxcomposites.com/faq.php
Reading the blub the Husaberg factory even used them for over 100 hours.

That's actually really interesting stuff, I wanted to use that stuff in my 6.6cc engines, but unfortunately the cost on those didnt scale well with price.
IE way to expensive for my buget.

[husaberg]

That's actually really interesting stuff, I wanted to use that stuff in my 6.6cc engines, but unfortunately the cost on those didnt scale well with price.
IE way to expensive for my buget.

They need to tool up and that I guess doesn't scale down well.
its creeping in to all sorts of stuff though its been in AP GP callipers since the 90's anyway.
Bloody hard to machine I guess with the ceramic particles.
I think Yamaha and maybe Honda have used it in sleeves.

[F5 Dave]

You are right with the all down, not totally sure with the US but they only got them in 82. MT50 I forgot about but yes all were 5 only ever seen two of them.
They had longer shocks always wanted to try a pair with MB50 springs and a spacer also the frame was slightly different with a conventional tank.
I have definitely seen 5 speed MB100's normal box. Bugger all trains about here at the moment now, no coal to cart.

I had a factory parts manual for the H100S Sold it to (forgot his name) there was bugger all of them and not sure if they was a Fiche for them back iin the day.
http://www.kiwibiker.co.nz/forums/me.../21379-Hilleye

I also had the 6 speed supplement to the service manual I posted on his thread.
http://www.kiwibiker.co.nz/forums/sh...post1130185396

Don't remember the MT shocks being any different, I had at least one. I wanted the rear hub and I laced the front onto the girlfriends CG to try get the brakes working better. But I'd ridden one, was it another? Was the first bike I'd ever bought from a shop. Was a wrecker.

[husaberg]

Don't remember the MT shocks being any different, I had at least one. I wanted the rear hub and I laced the front onto the girlfriends CG to try get the brakes working better. But I'd ridden one, was it another? Was the first bike I'd ever bought from a shop. Was a wrecker.

Yeah they were 25mm longer. The MB's had those small shafts and poxy long top mounts so bugger all else would fit other than the MT's.
The MT50 rear wheel or at least the sproket carrier I think was a rare for Honda one off, as it still had the 3 bolt sprocket like the MB5 I think (years ago)
I have a MB5 frame that someone in CHCH modied for an XL or XR motor that would have been an all right get to work machine.
Its mute of course as the RG50 was a better chassis and the RS and GPR frames are better again.
I picked up one of the old MB5 wheels the other day gee they are heavy and skinny

[trevor amos]

Hello Frits,
A guy in the States sent me this a couple of days ago, would you have time to analyse it as to its validity, and perhaps explain to me and others in lay-mans terms what it could mean and is it something to be factored into exhaust pipe calculations. Transferred compression waves is a new expression to me! The quote is as follows; and I should point out that the original author is unknown?

" The pressure ratio of the transferred compression wave,(transferred refers to the wave that is not reflected in the divergent and convergent cones of an expansion chamber), is directly related to the cylinder pressure at the point of exhaust port opening, versus, the pressure in the chamber at exhaust port opening. The transferred pressure ratio is significant as the reflected pressure wave is directly proportional to the transferred pressure ratio at and before the point of refection, at the change in area of the pipe, and the length of the area being considered. And you can chuck in some junk about specific ratio of heats, density, particle velocity, wave super position and of course temperature."

Thanks, Trevor

[Frits Overmars]

Hello Frits,
A guy in the States sent me this a couple of days ago, would you have time to analyse it as to its validity, and perhaps explain to me and others in lay-mans terms what it could mean and is it something to be factored into exhaust pipe calculations. Transferred compression waves is a new expression to me! The quote is as follows; and I should point out that the original author is unknown?
" The pressure ratio of the transferred compression wave,(transferred refers to the wave that is not reflected in the divergent and convergent cones of an expansion chamber), is directly related to the cylinder pressure at the point of exhaust port opening, versus, the pressure in the chamber at exhaust port opening. The transferred pressure ratio is significant as the reflected pressure wave is directly proportional to the transferred pressure ratio at and before the point of refection, at the change in area of the pipe, and the length of the area being considered. And you can chuck in some junk about specific ratio of heats, density, particle velocity, wave super position and of course temperature."
Thanks, Trevor

It seems safe to assume that with 'chamber' the author means the expansion pipe. I also assume that with 'transferred compression wave' he means the superposition wave that starts moving through the exhaust pipe after the wave exiting the cylinder has encountered the returning wave that was reflected by the pipe. If so, then it is something that's already been incorporated in exhaust pipe calculations. But I'm guessing here, and I haven't seen the expression 'transferred compression wave' before. Perhaps Vannik can shed some light on this when he pays us a visit.

[trevor amos]

Thank you for the reply Frits, It`s a relief to know I`m not alone in being in the dark over that expression, I did wonder about superposition but was never confident.
Over to you Neels?

Trevor

[jasonu]

Mike has had 30hp from his, mine approaches that. Still more to come but OK for 1978 tech.

Yes 30hp at 12500rpm and 3hp at 12490rpm...
It was really good at spitting the rider down the track plus IIRC it didn't hold together too well.

[jasonu]

does anyone know of any piston manufactures that do single ring pistons with the ring locator pin centrally located at the rear of the bore
to suit 250 mx engines
have tried vertex but even their single ring race pistons have offset pin locator to line up with a transfer bridge
cheers

Move the pin location to where you want it.

[polinizei]

Have a look at this:
http://www.wossnerpistons.com/produc...0-66-4-mm-bore

There is a also a flat top piston and dual ring version with centered pins for ktm mx.

There is 360° view, where you can see the pin position.

[polinizei]

Hey Frits,
what happens if the "airbox" is detached at the ryger engine?

Does this is a serious impact on performance?

[Frits Overmars]

what happens if the "airbox" is detached at the ryger engine? Does this is a serious impact on performance?

It's one of the many things we haven't tested yet, and for a good reason: it's compulsory on a kart because first and foremost it is an intake silencer and we don't want to jeopardize our relation with the track owner. Small country; noise rules are strictly upheld over here.

[FastFred]

Attachment 246711

Tonight Speedpro won the race to be the first documented usefull Bucket engine at 30rwhp

Mike has had 30hp from his, mine approaches that. Still more to come but OK for 1978 tech.

Yes 30hp at 12500rpm and 3hp at 12490rpm... It was really good at spitting the rider down the track plus IIRC it didn't hold together too well.

Not sure when Speedpros 30hp version spat anybody off, if its true, Jason maybe you could quote a post.



There you are 30hp and a good spread of power, a usable 4,500 rpm. Not bad for 70's technology.