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Author Topic: APS/G 250 2 Stroke in the Land of Oz  (Read 25315 times)
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Koncretekid
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« Reply #15 on: July 04, 2012, 10:06:40 AM »

Nice build.  I like photo #5 in your Photobucket album  - - Is that your launching ramp?

Tom
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wobblywalrus
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« Reply #16 on: July 04, 2012, 12:04:31 PM »

Pete, what are the individual weights of the fairing with windshield included, and the tail with the seat included?  It looks good.

Some of my friends race two strokes off road.  There are noise limits on all racing here and some mufflers quiet them down without taking away the power.  I can ask folks around here what works if you are interested.
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SaltPeter
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Metric 250 ona Red 250




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« Reply #17 on: July 04, 2012, 11:17:45 PM »

Have not weighed the Body Work.

I have not got the silencers fitted because there is no room for them it's that simple.

The back of the bike is open so any air inside can get out, I also hope it will reduce some of the drag at the rear of the Bike.

Ahh my secret test ramp is exposed. I use it to test downforce, if the the Bike keeps flying then the Bellypan is still producing uplift.

Seriously we have been looking at options to get on and off Lake Gairdner when the edge of the Lake is a bit soft.

Pete
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SaltPeter
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Metric 250 ona Red 250




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« Reply #18 on: July 05, 2012, 04:30:01 PM »

The next step was to Flow Coat it,



Then mounting it up,




Finally I got to have a go at the paint job,



The Finished Job



Pete
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That is why i run a 2stroke so I got plenty of room in the Pits evil
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Grandpa Jones
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« Reply #19 on: July 05, 2012, 05:50:27 PM »

Hi Pete,

Nice job on the bodywork!  cheers

How was working with the Divinycell? Can it be formed using a heat gun?

Thanks,

Dave
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SaltPeter
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Metric 250 ona Red 250




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« Reply #20 on: July 05, 2012, 10:01:48 PM »

Yeah Dave

It can be bent with the heat gun.

I could not get it to do a compound shape, it was a cut and paste job using the hot glue gun to get the front shape.

The idea came from one of our blokes over here.

http://www.dlra.org.au/forum/viewtopic.php?f=18&t=1320

I would not have tried it without these instructions (onya Ross).

Pete
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SaltPeter
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Metric 250 ona Red 250




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« Reply #21 on: July 08, 2012, 02:54:59 AM »

This is what it looks like naked



The engine is from a 1999 Aprilia RS250 road bike (an Aprilia badged Suzuki RGV engine)
I have done mods to strengthen the engine.
It has a welded up crank, Forged Wossner Single ring Pistons, Tuning Works (UK) Billet insert Heads (better cooling)



For performance I have removed the Airbox and made a cool air feed, fitted Jolly Moto Race Spec Expansion Chambers, Re Jetted and a Zeeltronic ECu (allows control of the Ignition Curve and the opening sequence of exhaust Power Valves, still tweeking the settings).



To monitor the Engine I am using Koso Water Temp (top) and EGTs gauges on each cylinder and the shift light is on the right of the Tach



Pete
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SaltPeter
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« Reply #22 on: July 24, 2012, 07:30:15 PM »

Pete, what are the individual weights of the fairing with windshield included, and the tail with the seat included?  It looks good.

Some of my friends race two strokes off road.  There are noise limits on all racing here and some mufflers quiet them down without taking away the power.  I can ask folks around here what works if you are interested.

I finally got around to weighing the individual pieces

Front Fairing is 8.1kgs
Rear Fairing/Tail is 8.3kgs
Belly Pan is 5kgs

The Bike naked and wet is 128kgs
Suzuki claimed Stock Fully Dressed Dry Weight is 139kg

So I am up around 6kgs wet.
I tried to get 60F/40R weight % distribution, I got 58F/42R.

Thanks
Pete
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SaltPeter
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« Reply #23 on: October 31, 2012, 03:05:42 AM »

I have made a few changes engine/trans wise. There has been a Billet Ally Clutch developed in the UK and I've helped out with some testing so I fitted it and it is feels great.
It is a lot lighter so it reduces the load on the Crank Bearings at the prolonged Max RPMs we run.

 


Been taking 3 steps forward and 2 back for a few months with the Tune up.
I had Higher Compression Head inserts fitted and I have found that I also need Race Ported Barrels to get them work. The engine would not rev past 10000rpm and make 57hp should go to 11500-12000.
So I fitted the Lower Compression inserts and You Little Beauty it worked.

   

and this lead to this



I am still Jetted safe with 1090F EGTs

Pete
One very happy Aussie

« Last Edit: October 31, 2012, 03:09:04 AM by SaltPeter » Logged

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Koncretekid
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« Reply #24 on: October 31, 2012, 06:40:11 PM »

Unbelievable! 77hp on 15 cubic inches, 5 hp per cubic inch. I think you've outdone the formula 1 boys, and at less than 11,000 rpm.  If you could just extend that torque curve for another 5,000 rpms or so, or add a couple more cylinders (500 Gamma?)  And I struggle to get 45 hp with 30 cubes.  Your bike may have a bit more frontal area than mine, but I predict you'll go way over 150 mph.  Now you just have to hold it together. Maybe I'll have to go 2-stroke.
Tom
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SaltPeter
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« Reply #25 on: October 31, 2012, 09:51:23 PM »

Hi Tom  cheers

The big advantage tuning wise in our sport, Land Speed Racing, is I can use leaded fuel and Sunoco Supreme fuel is fast burning and is stable enough to advance the timing way further than I can with Unleaded. We got a Torque reading of about 36 ft/lbs around 10000 rpm. The numbers are all relative to the Dyno you use, but it is a 14hp increase over my Stock set up. I am really happy with the way the Curve goes is really smooth and straight above 8000rpm.

I use a Zeeltronic Ignition system that gives me the capacity to program in a 3D Ignition map, and control the opening of the Power Vales in the Exhaust ports. This sort of technology was once only available for Factory and later over the counter Road Race bikes like  RS Hondas or TZ Yamahas,and was pretty expensive. Now it is both available and affordable.

I also have a set of Expansion Chambers designed for high RPM and not mid range Street Spec type pipes. I think I just did the research and eventually got all the Ducks lined up  grin

The disadvantage with 2 strokes is you need to tune to avoid seizing. Being able to get Carbs with Power Jet circuits in them makes a big difference. The Main Jet Circuit is helped by an extra Jet that adds fuel in the high RPM WOT range, so Jetting is less compromised. Still is a juggle.

Pete
« Last Edit: October 31, 2012, 10:00:27 PM by SaltPeter » Logged

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wobblywalrus
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« Reply #26 on: October 31, 2012, 11:15:49 PM »

Thanks for posting those weights, Pete.  I compares well with my tin work and is much lighter than my attempts at homemade fiberglass.  It is a method I am considering. It is much smoother aerodynamically than the riveted panels I am using.
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SaltPeter
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« Reply #27 on: November 02, 2012, 04:04:58 AM »

Still got to get weight distribution with me on the Bike.

Pete
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grumm441
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« Reply #28 on: November 02, 2012, 07:04:59 AM »

Thanks for posting those weights, Pete.  I compares well with my tin work and is much lighter than my attempts at homemade fiberglass.  It is a method I am considering. It is much smoother aerodynamically than the riveted panels I am using.

yep
but the riveted panels look really cool
G
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SaltPeter
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« Reply #29 on: November 02, 2012, 07:29:11 PM »

Multiple Vortex Generators hard to do that in Glass afro

Pete
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