Andrea Bartolini YZM400F engine and project.

[artracing]

WOW, I've officially drooled here...thanks for those pics. ?

 

It's amazing to see Yamaha put that level of effort and expense in to an effectively low number of prototype engines.

Begs the question who still has the drawings or CAD files to knock out a few more on a milling machine!!

 

As grayracer mentions, in the past there were some weird builds by the manufacturers. Honda made a 5 cylinder 125 four stroke. The pistons must have looked like thimbles! And it's hard to comprehend how the weight of all those reciprocating parts and the valve gear would be an advantage when one considers the frictional losses. And there was the oval piston NR500, basically a V8 but with only 4 cylinders to get round rules.

 

This YZM single cylinder engine is far more conventional in design but just as intriguing when you consider how they optimised it for it's intended purpose.

 

It's great to see this sort of project and I'm certainly looking forward to seeing it come together even more so now. Cheers.

Considering this IS the prototype engine that started the four stroke revolution. The return on investment is in the billions I would think now. They still can implement some things in this design into new YZ450 bikes, if they feel it worth while. Twin port exhaust, shorter rod stroke, higher compression etc.

This engine has 62ish HP and higher rev limit then stock.

I hope to have bike running in the next week or so. My only issue is the zeeltronic CDI. I need a startup timing map. I am using TPS and have 12 RPM points I can use.

[grayracer513]

 Honda made a 5 cylinder 125 four stroke. The pistons must have looked like thimbles! And it's hard to comprehend how the weight of all those reciprocating parts and the valve gear would be an advantage when one considers the frictional losses. And there was the oval piston NR500, basically a V8 but with only 4 cylinders to get round rules.

 

The Honda 5 cylinder 125 made horsepower in unbelievable gobs because of the rev range it operated in; it was redlined at 24,500 rpm, and long before F1 cars reached the 20K barrier.  Then there was the 6 cylinder 250 they expanded to a 297 so they could use it to dominate the 500cc class.

 

Moto Guzzi, of course, actually built a 500cc V8 before 1960.

[artracing]

The Honda 5 cylinder 125 made horsepower in unbelievable gobs because of the rev range it operated in; it was redlined at 24,500 rpm, and long before F1 cars reached the 20K barrier.  Then there was the 6 cylinder 250 they expanded to a 297 so they could use it to dominate the 500cc class.

 

Moto Guzzi, of course, actually built a 500cc V8 before 1960.

Where is that 5 cylinder? Amazing!

[artracing]

Little dress rehearsal. Still have good 40 hours of work to do before firing.

[grayracer513]

Where is that 5 cylinder? Amazing!

http://www.motorcyclespecs.co.za/model/Classic%20Racers/honda_125_fivecylinder.htm

 

http://www.deejay51.com/HONDA%20HALL/HONDAHALL%20RC149C.JPG

http://www.google.com/url?sa=i&source=images&cd=&docid=UXBICflaicdo5M&tbnid=_n8k5JC_sbT6kM:&ved=0CAUQjBwwAA&url=http%3A%2F%2Fthekneeslider.com%2Fimages%2F2012%2F06%2Fjls305-cylinder-head.jpg&ei=PKKPUu2kM4fZoATBsIKgAQ&psig=AFQjCNEJ3E-jJdCcx6-oa9pNgSySgV4CFQ&ust=1385231292876823

http://1oldtimer.files.wordpress.com/2011/05/honda-125-five-cylinder.jpg?w=900

[72degrees]

The Honda 5 cylinder 125 made horsepower in unbelievable gobs because of the rev range it operated in; it was redlined at 24,500 rpm, and long before F1 cars reached the 20K barrier.  Then there was the 6 cylinder 250 they expanded to a 297 so they could use it to dominate the 500cc class.

 

Moto Guzzi, of course, actually built a 500cc V8 before 1960.

 

Listen in awe (also features early four cylinder machines): http://gilera.org.uk/Audio/TT.WAV

 

Edited November 22, 2013 by 72degrees

[grayracer513]

Listen in awe (also features early four cylinder machines): http://gilera.org.uk/Audio/TT.WAV

Link doesn't work unless you're registered at the site.  Try this:  (watch the tach. the bike won't stay running below 10K)

 

[grayracer513]

Little dress rehearsal. Still have good 40 hours of work to do before firing.

 

That's going to be such a piece of work when it's finished.  Absolutely beautiful.

[72degrees]

Link doesn't work unless you're registered at the site.  Try this:  (watch the tach. the bike won't stay running below 10K)

 

Beautiful music!

 

Ah, I put the link in first without the file name. It's my site in a public folder so it should work now I hope.

 

http://gilera.org.uk/Audio/TT.WAV

[artracing]

WOW, I've officially drooled here...thanks for those pics. ?

 

It's amazing to see Yamaha put that level of effort and expense in to an effectively low number of prototype engines.

Begs the question who still has the drawings or CAD files to knock out a few more on a milling.

Well, I have the engine, can get a 3d scanner, and can get the solid modeling done and do the machining.

Only one problem! $$$$ . Want to be an invester?

Who is the racing market that's not controlled by some sanctioning body?

[rmxdan]

Well, I have the engine, can get a 3d scanner, and can get the solid modeling done and do the machining.

Only one problem! $$$$ . Want to be an invester?

 

Hmm ............. Much as billet components appeal to me, I'm more of a 2 stroke sorta guy, and all that farce stroke engine's extra components would cost more than I could justify investing in. ?

 

It is true that more people have access to CNC machines these days which does offer so many possibilities.

In the past I've had several batches of different components made up in large enough numbers to make it worthwhile putting in the effort to get them designed and drawn up into a file.

[cowboyona426]

Link doesn't work unless you're registered at the site.  Try this:  (watch the tach. the bike won't stay running below 10K)

 

 

That thing is unreal sounding!

 

That's going to be such a piece of work when it's finished.  Absolutely beautiful.

 

Agreed 100%, looks amazing so far!

[aremean_troy]

wow!!! Simply amazing!

[artracing]

As Frankenstein said, She's alive!!!!! After 15 years of silence

http://huskyrestoration.com/wp-content/uploads/2013/12/trim.7C49C4EA-A022-43DF-9217-ACAB8130DE7C.MOV

Want to thank Krannie for helping with timing curve and carb.

Hope to have it revving today.

[artracing]

Except for some tuning, SHE IS DONE.

 

Your going to like this.

 

First time in 15 years anyone as heard a YZM400

 

http://www.advancedracing.com/YZM2013.mp4

 

 

Thanks to Doug Dubach for remembering the carb set when he ran this engine in the day.

 

I'll do better video in future.

Edited December 7, 2013 by artracing

[cowboyona426]

Very nice!!!

[HRC]

The real deal...

[HRC]

One more vid on the real deal...

[artracing]

LOL I guess I have half the real deal, but I do have the only electric start version. I took the same video at Hall of Fame, the year before last, to use as my reference.

Hmmm , my bike is half works and half recreation. What we call it?

[rmxdan]

Hmmm , my bike is half works and half recreation. What we call it?

 

50/50 works re-creation?

 

I noticed this thread the other day.

https://www.thumpertalk.com/topic/1059806-happy-birthday-thumpertalk/

 

It seems these YZM400F bikes may be the very reason ThumperTalk came to be.