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The old iron horse is still going strong.

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Pete.
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PostPosted: 21:41 - 21 Jun 2021    Post subject: The old iron horse is still going strong. Reply with quote

Those of you who remember my home-built turbo bike might be interested in this. I sold it a few years ago but never having reached it's potential on the runway. It was a tempermental beast not least because when I was campaigning it on the runway it was not a road bike so there was no potential for testing - it either worked on the day (2 days a year) or it didn't - and more often it didn't. One year a bad misfire, another year a blown clutch.
Last time I rode it was at the Pod and again it had a roasted clutch and (as Ilater discovered) a blown-off vac signal pipe meaning no extra fuel for boost.

It's since changed hands a couple of times and the new owner has done it proud - to the tune of an official 238mph!

It's from last year but I only found out about it today. It has new bodywork (and very smart it is too) but it's definitely my old copper bike:

https://www.demondesignsracing.com/post/jay-joins-the-200mph-club

Wish I could have ben the one in the saddle but it's intensely gratifying nonetheless. 14 years of turbocharged running on the same engine is no mean feat.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Pigeon
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PostPosted: 22:52 - 21 Jun 2021    Post subject: Reply with quote

Mega result! Looks good.

Swingarm doesn't look standard + loads of adjustment, but isn't anyway near as long as some fitted to drag bikes.
Is that anything to do with the 1300 weight over the front, or its just a more stable setup or?
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Pete.
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PostPosted: 05:13 - 22 Jun 2021    Post subject: Reply with quote

Pigeon wrote:
Mega result! Looks good.

Swingarm doesn't look standard + loads of adjustment, but isn't anyway near as long as some fitted to drag bikes.
Is that anything to do with the 1300 weight over the front, or its just a more stable setup or?


I cut the old drop-outs off with a mini-grinder and welded in those extended ones to allow for up to 6" over-length wheelbase. That's for sprinting and drag racing you don't want it longer for landspeed racing it just makes the wheel spin up.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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AL-
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PostPosted: 10:13 - 22 Jun 2021    Post subject: Reply with quote

Well done. I am glad you get to see your hard work pay off Thumbs Up
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mentalboy
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PostPosted: 14:57 - 22 Jun 2021    Post subject: Re: The old iron horse is still going strong. Reply with quote

Pete. wrote:
...it either worked on the day (2 days a year) or it didn't...
...14 years of turbocharged running on the same engine is no mean feat.


Thinking Wink

Must be satisfying to know that she was capable of non too shabby numbers. Thumbs Up
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Hong Kong Phooey
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PostPosted: 11:03 - 24 Jun 2021    Post subject: Reply with quote

Good base bike for it, aerodynamics comes into play at those speeds for sure.

I often wonder what the limit of stock internals is on these, it's torque rather than horsepower that bends the rods, or cylinder pressure lifting the heads. So mapping can overcome some of it with a smooth ramp up, but there must be a bottleneck in there somewhere.
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B5234FT
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PostPosted: 11:44 - 24 Jun 2021    Post subject: Reply with quote

Congratulations! Is there a build thread for it anywhere?
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Pete.
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PostPosted: 21:21 - 24 Jun 2021    Post subject: Reply with quote

B5234FT wrote:
Congratulations! Is there a build thread for it anywhere?


There was 14 years ago. You can thank Virginmedia for the disappearance of my home webspace and all the hosted pictures.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Pete.
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PostPosted: 21:43 - 24 Jun 2021    Post subject: Reply with quote

Hong Kong Phooey wrote:
Good base bike for it, aerodynamics comes into play at those speeds for sure.

I often wonder what the limit of stock internals is on these, it's torque rather than horsepower that bends the rods, or cylinder pressure lifting the heads. So mapping can overcome some of it with a smooth ramp up, but there must be a bottleneck in there somewhere.


I heard of people making 400 on stock rods but I wouldn't risk it. My first turbo made 300hp on stock internals. They are happy at that but factors come into play if you want to go more. Road horsepower is harder on the engine than dyno horsepower. Small turbos harder than big turbos for the same power. Nitrous is harder on the internals if you activate it at too low a RPM.

The killer for rods is peak torque. If you're trying to accellerate 300+ kilos of bike and rider you'll dwell at peak torque and peak cylinder pressures longer than if you're trying to acellerate a dyno roller, so you could tune a bike for I dunno 350hp and do numerous dyno runs then put it on the road and pop a rod. Small turbos spin up earlier so make boost at lower revs. Lower revs means the piston is dwelling at peak cylinder pressure for longer so you're adding huge torque with the turbo and holding it for longer = bad for the internals. Put the engine in a car and you add even more to the stresses as there's even more mass to acellerate. It;'s common for them to have to fit output shaft supports as the cases have been known to break

My bike had (has) Carillo rods, JE turbo pistons good for 500hp. I drilled the 10mm head bolts out and fitted high-tensile 12mm bolts, same for the 9mm case bolts. The head stays put and the cases don't chatter on that bike. I've even known people weld the cylinders to the cases but I think that's a bit extreme.

Few pics attached.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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chickenstrip
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PostPosted: 21:47 - 24 Jun 2021    Post subject: Reply with quote

How much extra does shot peening of rods allow them to take? And how does that work?
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Pete.
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PostPosted: 22:53 - 24 Jun 2021    Post subject: Reply with quote

chickenstrip wrote:
How much extra does shot peening of rods allow them to take? And how does that work?


The reasoning behind shot peening (as I understand it) is that every place a bead of shot hits is punched in like a crater leaving an annulus of raised material so the whole surface is covered in a pattern of even stress-waves which (theoretically) reduces the risk of local stress risers where a crack would start and cause rapid failure of the rod.

I have no idea how effective it is, I'm sure that the rod manufaturers must have reams of data but you won't get to see it ever. The Carillos I fitted did have some kind of texture but also came with a warning not to magna-flux the rods to check for surface cracks. No idea why but it might be to do with magnetising the rod.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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P.
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Joined: 14 Feb 2008
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PostPosted: 15:27 - 25 Jun 2021    Post subject: Reply with quote

I regret never trying this bike.

Glad it is still doing the rounds though!
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