NSR FXR, the new No45

[andrew a]

Looking good Rich.

[husaberg]

Great HP as well BTW. But the exhaust did you ever get around to trying out a reverse cone mega i remember you were going to a while back
One manufactured like of these would sure be be yummy.

[richban]

Great HP as well BTW. But the exhaust did you ever get around to trying out a reverse cone mega i remember you were going to a while back
One manufactured like of these would sure be be yummy.

Yeah made 2 megas. Both shit. Also really hard to make them work and stay under 95db. Hard enogh getting a normal muffler to muffle the thing.

[husaberg]

We were encouraged to use a perforated baffle sheet incerted with an air gap.When the noise first beacame a factor with the classics
with a straight pipe To take the edge of noise with a slit near the end helps also, but we never had to meet 95DB.

The Dunstall silencers were interesting design.internally. This Tyga is cute

Are the noise test static or drive by?
I do remember some dutch students devised a way to have it loud whist under load. but yet quiet for the stationary noise test.
I have a Akrapovnic on the Berg ,be interesting to see whats in it (not much i am guess it it horrendously loud even with the tiny end cap in it.

Then again Ducati must have know a thing or two i guess (huge)twin entry and exit actually most of the singles ran twin pipes from memory


Still one of the prettiest bikes ever, now what.... nearly 20 year's or so later....
Do BMS still have their one...?

I know not to believe all the hype but from what i understand the FMF bomb header made the pipes quieter as well...

[richban]

Noise test was drive by. Mine is fine. One of the more quite bikes of the day.

Mega booms are used in some open wheeler headers as well. Biggest problem with my pipe now is it hits the deck. It sent me into a rather spectacular power slid with smoke and all. I will have a look at the video later.

Well new bike is the best bike I have ridden. Just need to get the rider fit. Last all in race of the day was fast for sure. Love my new bike.

[F5 Dave]

One day,

one very special day,

Husi might post something that he hasn't cut & pasted from the internet.

[husaberg]

One day,

one very special day,

Husi might post something that he hasn't cut & pasted from the internet.

gee hope springs eternal
But really, That optimism may be misplaced Dave.

PS i attach the image with the Http code so no cutting is needed.Just copy
have you seen the inside of a Dunstall silencer ( i have but never thought of taking a picture)

the bomb header as a side effect of its design i believe lowers the DB with a processed called attenuation i assume the Termigoni
could also have used the principal but i doubt they thought of it.
Someone in the industry you work in, could explain attenuation far better than me. Without the net.
The reason i brought it up is there is a large amount of room directly beneath this engine to use both this and absorption, expansion with twin exits either side which could be extremely trick.Wings on top and around could be added also to serve as a 4 stroke diaper.
I would of course never get around to it.Rich would have to do this assuming he wanted to. Not that he needs more hp mid you.

[richban]

Well now the new engine is coming along it is time to think about the next one.

I do like the idea of a plain bearing bottom end and as grumph has mentioned the cbr 600 92/94 rods will work with some crank mods. 45.2mm.

So I surpose some reading and asking of knowledge is required. Oil pressure needs to be raised and crank balance would be critical. But what revs could it pull and last a season? 15? Don't know. Will all the seals be ok with extra oil pressure? Is it worth the bother.

[husaberg]

Ducati supermono, BSA Starfire, Royal Enfield.... thought it was......I like the ducati supermono solution myself. Indycars and nascars make worthwhile gains usng friction and oil control so possibly......
What stoke are you at now with what piston speed. Im am old school FT/Minute

[TZ350]

Well now the new engine is coming along it is time to think about the next one. I do like the idea of a plain bearing bottom end.

Is it worth the bother.

Absolutely .......

[richban]

Ducati supermono, BSA Starfire, Royal Enfield.... thought it was......I like the ducati supermono solution myself. Indycars and nascars make worthwhile gains usng friction and oil control so possibly......
What stoke are you at now with what piston speed. Im am old school FT/Minute

48.8 stroke = 4000fpm. at 12500.

Looks like its possible to run quite large pistons in the FXR so could look at a 69mm piston with stock CBR rod. At 45.2. Can't really put bigger valves in so the ideal combination of stroke, piston size, valve layout / combustion efficiency. Sounds to hard already. I suppose working back in scale from the Moto3 piston size regs might work. Not sure really. But I am allowed to make it rev higher than a moto3 bike. Maybe this is a project for a CBR engine. Anyone want to swap a stock CBR engine for a 20 something hp FXR engine?

[Grumph]

48.8 stroke = 4000fpm. at 12500.

Looks like its possible to run quite large pistons in the FXR so could look at a 69mm piston with stock CBR rod. At 45.2. Can't really put bigger valves in so the ideal combination of stroke, piston size, valve layout / combustion efficiency. Sounds to hard already. I suppose working back in scale from the Moto3 piston size regs might work. Not sure really. But I am allowed to make it rev higher than a moto3 bike. Maybe this is a project for a CBR engine. Anyone want to swap a stock CBR engine for a 20 something hp FXR engine?

Well we've been running our 54.8mm stroke old FZR600 to 14 grand....with race kit rods which look spindly and inadequate alongside CBR600 ones....the thing apparently made just over 100hp at the wheel when first built and since a freshen up it may be making more.

As i've said to bro Kev, 3 cylinders of a Kawa 250 four, weld and destroke, use 20 grand.....

[husaberg]

48.8 stroke = 4000fpm. at 12500.

Looks like its possible to run quite large pistons in the FXR so could look at a 69mm piston with stock CBR rod. At 45.2. Can't really put bigger valves in so the ideal combination of stroke, piston size, valve layout / combustion efficiency. Sounds to hard already. I suppose working back in scale from the Moto3 piston size regs might work. Not sure really. But I am allowed to make it rev higher than a moto3 bike. Maybe this is a project for a CBR engine. Anyone want to swap a stock CBR engine for a 20 something hp FXR engine?

I mentioned the supermono as it has a plain bearing but a non bolted rod. Fitting in the built up rod might require a few more mods the CBR250 the new one i thing has a plain bearing from memory.
Been a while since i seen the 600 stuff no doubt it has been pared down heaps but it is from a smooth firing four that has been designed to be compact what sort of rod lengths are they.

Still got a FZR250 here in bits but the 3 requires an ugly piston when restroked from adequate comp.
The CBR250 4 screamed out to be made a three but those cam gears make destoking problematic plus i think the bore is even larger that the Honda with the kawa the same or bigger again i think?

[richban]

As i've said to bro Kev, 3 cylinders of a Kawa 250 four, weld and destroke, use 20 grand.....

I like the single's. I would not fancy the extra 20kg of engine to lug around.

[speights_bud]

I'm sure you guys know alot more about useful stroke lengths etc, but from something i did at my old work for a customer was stroke an R6 down to fit into F3, (billet machined crank) and it worked but the result (as i heard through the grapevine) was a stroke so short it made power that was difficult to make use of properly, apparently like a 2-stroke but less usable...