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Old 01-16-2012, 12:31 AM   #76
overlandr
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Back on topic. Found this for those interested in landspeed moto-porn whilst we await ...



ok ok its: 4stroke, a 500, its a speedway bike but it has 16:1 CR , runs on methanol, the oil is changed every 4-5 heats, carb is a Blixt from Sweden and its got huge racing pedigree 'cos its a Jawa. Pity the sound is buggered on the clip

Edit: did you see the size of the steering damper?

overlandr screwed with this post 01-16-2012 at 12:49 AM
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Old 01-16-2012, 04:17 AM   #77
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Originally Posted by overlandr View Post
Back on topic. Found this for those interested in landspeed moto-porn whilst we await ...



ok ok its: 4stroke, a 500, its a speedway bike but it has 16:1 CR , runs on methanol, the oil is changed every 4-5 heats, carb is a Blixt from Sweden and its got huge racing pedigree 'cos its a Jawa. Pity the sound is buggered on the clip

Edit: did you see the size of the steering damper?
I am liking this, the footage on the embedded youtube vid shows the bike at full throttle.

The steering damper is exactly the same unit as i am using, except its got a fancy CNCed bracket, whereas mine is just plain ol' CCed (Charlie Controlled).
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Old 01-23-2012, 01:35 AM   #78
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ok another update:

i have completely changed the tail section, i decided the large red tail was going to increase drag greately, so have decided to go with this one:



this reduces weight alot too, and move the center of gravity much further forward.
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Old 01-27-2012, 03:55 AM   #79
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Getting the fueling right?

Quote:
Originally Posted by God of Speed View Post
ok another update:

i have completely changed the tail section, i decided the large red tail was going to increase drag greately, so have decided to go with this one:



this reduces weight alot too, and move the center of gravity much further forward.
Hi Chap, love your project and wish you all the best of luck. Just a thought regarding the fueling on the bike when using ram air. To ensure the bike does not lean out at high speeds due to the pressure difference between the in coming pressurised air and that of the fuel in the tank, may I suggest you look into running the breather for the fuel tank and carburetor etc into theairbox so there is NO pressure differential at higher speeds which may cause a leaning out of the mixture? Just a thought.

Cheers,
David.
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Old 01-27-2012, 06:18 AM   #80
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Hi Chap, love your project and wish you all the best of luck. Just a thought regarding the fueling on the bike when using ram air. To ensure the bike does not lean out at high speeds due to the pressure difference between the in coming pressurised air and that of the fuel in the tank, may I suggest you look into running the breather for the fuel tank and carburetor etc into theairbox so there is NO pressure differential at higher speeds which may cause a leaning out of the mixture? Just a thought.

Cheers,
David.
good thinking, i like it.
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Old 01-28-2012, 01:45 AM   #81
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Chopper work ?

Not a two wheeled chopper eh Clarky ???
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Originally Posted by clarky View Post
About 40-60c more than ULP, go to you closest small airport, wait till some bloke is fueling up his cessna and swing him some cash!!! Otherwise you need a fuel card, we regularly fill 205L drums for chopper work using a fuel card.....no permit required.
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Old 01-28-2012, 04:55 PM   #82
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Not a two wheeled chopper eh Clarky ???
Cheers
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Ha ha, well the 640 does go a bit better at the moment......not sure why though
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Old 01-30-2012, 12:12 AM   #83
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Originally Posted by God of Speed View Post
oh i thought it would be many many dollars per litre.

I will look into it.
AVGAS costs more, but it is relative. You are basically paying /per octane point, roughly.

Alcohol is different, you buy 205 litres at a time and it certainly ain't cheap, and as soon as you crack the drum you have to use it, as it is hygroscopic and becomes useless as racing fuel in short order.
Avgas is a leaded fuel (resists detonation/pinging) for aviation use, it is a very consistent quality and high octane, and if you stuff some into your non-cat-equipped bike it will go a whole lot stronger, harder, and better. It is also illegal for everyday motoring use.
I don't remember exactly, but I seem to recall Avgas being around 130 RON?
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Old 01-30-2012, 03:10 AM   #84
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It's horses for courses.

If you use Methanol, the engine system should be tuned to use methanol. If you use high octane aviation style fuel the engine system needs to be tuned to use aviation fuel. Just simply substituting is fairly pointless.

Both fuels are NASTY chemicals. NASTY. Let me say that again... NASTY...

For what it's worth, I'd push you towards considering Methanol. It's easier to procure and slightly cheaper than AvGas. The thing about Methanol is that you need to use special lubricants (again fairly available if expensive) but most importantly at the end of each session you need to get every last trace of it OUT of your engine and run a good 'after run' lubricant through the donk to scavenge every last trace of methanol out of the motor. As mentioned methanol is very hydroscopic and if left in a mechanical device will rapidly promote corrosion... Think rust on big end bearings etc. In application, it is almost impossible to get Methanol without a small water content.

The nice thing about Methanol is that because of it's composition (think lots of oxygen atoms) it tolerates average jetting better than Avgas etc and runs significantly cooler. Less holes burnt in pistons etc. From memory (please correct me!!!) you use a main jet roughly 15 times larger than that for normal petroleum distillate... The fuel consumption is proportionate.

Oh... and the smell!! Oh lordy... :-) It just smells FAST!!!!! :-)

An interesting experiment would be to have two carbs and two cylinder/head/piston combinations. One for 'normal' premium and another for Methanol. Go to the lake. Run the known petrol motor, get the bugs sorted and then bang on the Methanol combination....

Are you going to take the rig to the Tailem Bend test and tune?
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Old 01-30-2012, 03:09 PM   #85
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Originally Posted by FatBoyCrash View Post
It's horses for courses.

If you use Methanol, the engine system should be tuned to use methanol. If you use high octane aviation style fuel the engine system needs to be tuned to use aviation fuel. Just simply substituting is fairly pointless.

Both fuels are NASTY chemicals. NASTY. Let me say that again... NASTY...

For what it's worth, I'd push you towards considering Methanol. It's easier to procure and slightly cheaper than AvGas. The thing about Methanol is that you need to use special lubricants (again fairly available if expensive) but most importantly at the end of each session you need to get every last trace of it OUT of your engine and run a good 'after run' lubricant through the donk to scavenge every last trace of methanol out of the motor. As mentioned methanol is very hydroscopic and if left in a mechanical device will rapidly promote corrosion... Think rust on big end bearings etc. In application, it is almost impossible to get Methanol without a small water content.

The nice thing about Methanol is that because of it's composition (think lots of oxygen atoms) it tolerates average jetting better than Avgas etc and runs significantly cooler. Less holes burnt in pistons etc. From memory (please correct me!!!) you use a main jet roughly 15 times larger than that for normal petroleum distillate... The fuel consumption is proportionate.

Oh... and the smell!! Oh lordy... :-) It just smells FAST!!!!! :-)

An interesting experiment would be to have two carbs and two cylinder/head/piston combinations. One for 'normal' premium and another for Methanol. Go to the lake. Run the known petrol motor, get the bugs sorted and then bang on the Methanol combination....

Are you going to take the rig to the Tailem Bend test and tune?
Some good advice there, Cheers.

I had hoped to go to the test'n'tune but due to my busy schedule at the moment i wont be able to.

I am just writing another update as to where i am at now.
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125cc Salt Racer - God of Speed Thread
'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
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Old 01-30-2012, 03:18 PM   #86
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update

ok so the ram air and new rear end are done.





those photos make it look like the ram air pipe is poking out further than it acutally is, when i am sitting on the bike it all fits together well and my knees are still tucked up.

i am halfway through changing the consumables in the bike, bearings, pads and trying to find the correct front tyre, which is a skinny 16inch but with the 'H' speed rating.

There is a tech inspection day on the 19th of feb, which i will easily be ready for.

It is to be noted that the bike is quite a bit different to what i had planned it to be in the beginning, this is due to cutting bits off the project like partial streamlining and full custom exhaust. But as we say in Formula-SAE, its better to have a working car on the day of the comp, than to have an amazing car the day after the comp has run. So i feel i have done the best with what i had, next year the bike will probably look alot different, but i will have had a whole other year to tinker on it by then!

AS for the questionable decisions i have made about the project:


Stay tuned for fine-tune stage shenanigans.
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'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
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Old 01-30-2012, 05:24 PM   #87
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As you say, the main thing is that you are doing it!!! At least you are having a go. Wish I could be there giving you a hand.

I have a deep desire to do 200mph on two wheels.... It would have to be the same way that you are going, with what you have when you have it. My mate just scored a FJ1100 for 500 bucks....
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Old 02-16-2012, 02:23 AM   #88
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Update please
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Old 02-17-2012, 05:35 PM   #89
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Old 02-18-2012, 02:34 AM   #90
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Quote:
Originally Posted by God of Speed View Post
Yo,

yep weve got temp sensors and bucket full of jets, and yes, theres a limit to how much you can prepare the numbers, being there willl be a completely different kettle of octopi.

Is avgas part of the 'commercially available fuels' which are legal in the gasoline class? maybe this part of the rule is up for interpretation.

I have just sent off the forms today so i guess i will be getting a racing number soon?
Having a bucket full of jets is great...if they are from the same series/rate/set whatever. The numbers don't always mean the same thing.

So how to check; set up a rig with a specified level of fluid in it, maybe 500ml, then time how long it takes to drain. there are other various ways to check flow rate, but making sure the numbers on your bucket of jets are incremental is very important.

As for fuel. Very good information from FBC and GodSilla. Personally I'd run AvGas this year, As GodSilla says, it makes life much easier to read the plug for tuning. Speaking of reading the plug, do you know how to do a 'plug chop'?
Best results are max RPM in top gear, hit the kill-switch, pull the clutch, and shut the throttle all at the same time. (takes a few goes to get it right).

When you get the bike back to the pits, whip out the plug (or if you are super keen, take the head off), this will give you a snap shot of how the mixture was when you killed the motor. And for those of you who haven't raced it seems rather harsh on the machine, but it is critical you get the best jetting at maximum RPM, it is a competition after all.
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