Yellow Peril...

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bwolfie said:
Some cool stuff here

+ 1 I really wish I could read it AND understand it-- but you're right thats some super cool effort they have going on there.
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We don't need him, we have google translate.... Umm we need him... Or Phillipe..
 
That is a serious motorcycle - love the crankshaft ! There is a guy up in queensland using CNC to make them @ $2,500.
 
Yes a beautiful crankshaft, excellent machining equipment and the balancer too. Company in the Detroit area will make custom cranks, Moldex Crankshaft Company. They make anything, including NASCAR and other race car stuff, antiques. Moldex made the one-piece Norton cranks for Ron Wood. Ron’s Norton motors made about 90 hp – and lasted for 25-lap AMA National races. The late C.R. Axtell had a lot to do with those motors too.
http://www.moldexcrankshaft.com/oserv
 
A few words about the Yellow Peril team . In 2005 Jean Noel Gindrat built the first version to race in the Bol d'Or Classic, an endurance event for classic bikes . they were very successful being able to achieve a 3nd place behind a 1135 Godier Genoud Kawasaki and a Honda CR with a first place in one race and a 6th in the other , breaking the primary belt 90 secondes before the flag when they were first .

Since a few years newer bike are allowed : Honda RCB, GSXR Suzuki .... so they have to find more power , they are now able to be as fast as top team on one lap but not made it for 2 times 2 hours (Bol d'or Classic is not 24 hours as the real thing) and bottom end was the weak point. That's why Jean-Noel is building this crankshaft with Titatium rods . Last year lack of funding prevent them to be ready but they hope to do it in 2013.
 
Apparently MAP make a 76degree staggered crank for commandos for $1500. And Megacycle make the cams. Has anyone experience with these ?
 
Yellow Peril...
Looks like theyre no longer persueing experimental curved cylinder bores .
 
Matt Spencer said:
Yellow Peril...
Looks like theyre no longer persueing experimental curved cylinder bores .
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I got a call from someone in the Yellow Peril team two or three years ago. They were interested in the lightweight JS rods & pistons (see below). Two versions of the JS rods are available - standard has a small end weight of 105 grams and a small end weight of 95 grams is special order. I was in high hopes to be associated with this team. But they didn't follow up and instead went with another brand of aluminum rods. The billet Aluminum rods failed - probably because the aluminum expanded when hot and the rod bolts broke when they were loose and hammering on the crank. It must have been very expensive and disappointing for them. So now they are trying titanium rods. I have asked them what they weigh on the small end but they didn't answer. The softer titanium rods must have bronze bushings and that adds to the weight. The JS rods use DLC pins and don't need the bushings - hence the weight savings.

Yellow Peril...


Yellow Peril...
 
jseng1 said:
[quote="Matt The JS rods use DLC pins and don't need the bushings - hence the weight savings.

Yellow Peril...


Yellow Peril...
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. That really is a beautiful product you've created, a set definitely will be going in my 75 MkIII street bike project :)
 
Hi , about the head , it's a "one off" (or nearly!), JNG had them made specially on his own design in an Italian foundry,after a subscribtion through the french NOC (and much more money from his own pocket.....!), they were designed in fact by some private engineers working from a famous car factory.......(race dpt), he is a very nice guy and totally nut on his project, I had spoken few times with him and of course propose to contact JS, but....as Jim said, no feedback. I think he is a bit like Jim , he wants to make himself! There are few people like that over the planet : Steve Maney, Jim Comstock,the guy I miss the name in Germany, Jim Schmidt, and may be a few more, some are wellknown , some less......!
 
If you look closely at the picture of the JNG head you will see that it's scrap because of incorrect machining. The exhaust ports, valve guide holes and rocker spindle posts have been machined about 3/8" off towards the primary side. Seems like the one in the background has the same problem. Costly mistake!
 
Highly unlikely a mistake. More likely running larger bores offset bores similar to Steve Maney 1,007cc engines. Makes sense to move valves to take full advantage of larger offset bores.
 
Pardon my French:

QUOTE

Nous aurions voulu également remplacer la culasse existante, par une autre, usinée différemment dans le but d'améliorer les performances.

Cette nouvelle culasse à été usinée de travers, fin juillet, et ne pourra pas être utilisée !

UNQUOTE
 
johntickle said:
Pardon my French:

QUOTE

Nous aurions voulu également remplacer la culasse existante, par une autre, usinée différemment dans le but d'améliorer les performances.

Cette nouvelle culasse à été usinée de travers, fin juillet, et ne pourra pas être utilisée !

UNQUOTE
Click to expand...

Translation:

"We would also want to replace the existing cylinder head by another machined differently in order to improve performance. This new cylinder head was machined through the end of July, and can not be used!"
 
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