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Post by Johansson on May 24, 2011 11:09:01 GMT -5
I modified the lid in the lathe and fitted the fan today, as I suspected most of the air escapes to the sides but a fair amount blows through the engine and out of the turbine housing so I think it´ll work.   Since the special thread taps for the spark plug hadn´t arrived yet I fitted the tyres to the wheels and gave them a cleanup to get rid of old chain lube and dust.  This is a mockup of the bike with engine in place, as it looks now I will be able to fit a single exhaust up behind the seat which is great. It will look much better than twin exhausts to the sides and make the placement of my legs much easier.   The wheel base in this mockup is 190cm which feels pretty good.  Another view.  |
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on May 24, 2011 11:58:05 GMT -5
How have people been using a starter motor to spool their GTs? I can't find a clutch that can handle the overspeed of 50k or so. Is it done more like the bendix drive in your typical car? The idea of not having to tote a compressed air tank around is very tempting to me...
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Post by Johansson on May 24, 2011 12:15:13 GMT -5
Exactly, they use a bendix clutch which disengages once the turbine has reached idle revs.
For me it isn´t that big a deal to drag a scuba tank around, the bike will be used on race tracks only (except for an occational test run around the block) so I will have a car full of equipment close by at all times.
The weight and space "penalties" when using a starter motor instead of compressed air far outweighs the benefits in my case, for John it is a different story since the bike they are building is going to be street driven and has to be able to start anywhere by the push of a button.
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on May 24, 2011 12:29:04 GMT -5
I need to get a look at some pics of that whole setup on their bike, a 1/10 scale rc car brushless inrunner with a kv in the 6000 range looks like plenty for my t3/t4 hybrid, especially with 12 volts on it...
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Post by Johansson on May 24, 2011 13:16:56 GMT -5
Just remember that you cannot apply any axial force to a turbo with journal bearings, so you will have to be a bit innovative with the coupling between the motor and compressor nut.
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on May 24, 2011 13:27:56 GMT -5
Do you mean not absolutely any, or can I get away with a few ounces of force to mush a rubber bumpstop onto the front of the shaft?
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Post by Johansson on May 24, 2011 14:02:24 GMT -5
I wouldn´t recommend any pressure at all, and with the draggy oil bearings a lot of force will be needed to keep the O-ring from slipping on the nut.
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on May 24, 2011 19:42:12 GMT -5
Any guestimates on how fast you think/ hope the bike will go once it's done?
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Post by Johansson on May 24, 2011 22:59:54 GMT -5
200mph is the goal I´ve set for this bike.
The record for the electrical/turbine/steam motorcycle class on Bonneville is 176.434 and is set by Riches Nelson on an electrical bike, so it would be really daft to build a land speed bike that is unable to break any records.
If it turns out to be too slow I will only race it here in Sweden and start building a new bike with a pair of similar engines to get the power needed. No big deal. ;D
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on May 25, 2011 6:28:38 GMT -5
holy shit that's fast. Make sure to tighten all those bolts...-and to wear a helmet cam |
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Post by Johansson on May 25, 2011 7:27:21 GMT -5
Not really, I´ve been at 190mph with the street bike countless times and the only exciting thing about that is trying to avoid the cars, holes in the road and manage to slow down before the bend at the end of the straight. With a dead-straight, flat track without senior drivers in the middle of it I don´t see 200 as a problem. |
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on May 25, 2011 10:34:30 GMT -5
lol 200mph is like a walk in the park? ;D balls of steel/ ice, man!
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Post by Johansson on May 25, 2011 11:02:59 GMT -5
With that said I might very well crap my pants before I reach 100mph depending on how well I build the frame... ;D
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Post by Johansson on May 26, 2011 16:04:15 GMT -5
I made a FOD screen today for the intake, I will get some stainless clamps to hold it in place so it won´t get sucked into the compressor. That would be some irony, the thing preventing items from damaging the compressor wheel falls in and ruins it...  |
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jettoymaker
Junior Member
Joined: September 2010
Posts: 55
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Post by jettoymaker on May 27, 2011 1:04:24 GMT -5
Hi Anders,
Love the look of your bike..even in the rough. The fairings are very sexy, what are they from? I wish I could do inline mounting for the one I'm building, as the ability to dictate where it all goes as you wish is much prefered to having the components dictate the terms:-(
I might have to get you over to ride ours, as I haven't riden before and the idea of pushing this thing to it's top speed isn't filling me with confidence :-O
Wish I could get through the build as fast as you and John.
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