APS/G 250

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Sat Oct 13, 2012 8:11 pm

I got a chance to do the final testing on a new Billet Clutch from The Tuning Works (UK) for RGV/RS 250 Engines.

Image Image

It is lighter than the stock unit and this will reduce the load on the Crank bearings at sustained high RPM. All fitted and will be off to the Drags next week to test it out :twisted: .

Pete
#866
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

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RGV
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Re: APS/G 250

Post by RGV » Sat Oct 13, 2012 10:33 pm

Good luck at the drags Pete, show em what a smelly 2 stroke can do. :D

Hope the new clutch performs as good as it looks. Pitty you probably wont get to run it at the Tailem Bend Test & Tune as not enough people have put their hands up to attend as yet. :evil:

Come on people not too late.

Dave

Last Minute Racing
DLRA #928

2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Wed Oct 17, 2012 4:15 pm

The engine just hits a wall at 10000rpm should rev to 12000 tried changing both the Jetting and Ignition.

I am only left with too much Compression for the Standard porting. So I've fitted the Lower Compression Insert heads 11.5:1. They are Modified Stock Heads with Billet Inserts.

Image Image Image

Find out soon

Pete
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Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

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gennyshovel
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Re: APS/G 250

Post by gennyshovel » Wed Oct 17, 2012 4:59 pm

Pete, I found one of these helpful mate.(lithium batteries extra, that might be your problem)
http://magiccrystalwands.blogspot.com.a ... t-way.html
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

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RGV
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Re: APS/G 250

Post by RGV » Wed Oct 17, 2012 6:30 pm

Vince does some very nice heads. Are they the TZ style inserts Pete?

Dave

Last Minute Racing
DLRA #928

2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Thu Oct 18, 2012 12:05 am

Hey Tiny

I knew I was missing something, and I just thought it was a glitch in the polarity of the vortex within my Parallel Universe, what I needed all along was some good old fashioned Magic :lol:

Hemi Heads Dave,

Combustion chamber volume: 11.9cc

Compression ratio: 11.5 : 1

Squish ground clearance: 0.8mm

Squish angle: 2.5°

Squish area: 40%

Sparkplug hole ground clearance: 10.3mm

Base gasket thickness: 0.5mm (standard)

This is the lower Comp spec.

Pete
#866
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

grumm441
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Re: APS/G 250

Post by grumm441 » Sat Oct 20, 2012 9:38 pm

have you had at the advance curve
it doesn't go all retarded at xk rpm
G
They make it
I make it work

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Mon Oct 22, 2012 9:38 am

Yeah Grum the RGV does not like too much advance at high rpm.

I originally programmed in the Suzuki race kit curve and it has a lot of advance across the whole rev range.
but I have since learn't that it was developed to work with advanced port timing/ raised compression/race pipes and Avgas.
The Kit set up will give me "mid range" but can stop over rev if the port timing is not advanced enough.

So I am going back to a closer to stock comp ratio to go with the std port timing and now have a few different ignition curves I can try when I go back on the Dyno next week. :D

Pete
#866
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Wed Oct 31, 2012 2:39 pm

Finally got a good clean Tune up (had a RPM logging issue)

Image

EGTs max at L 1107F R 1103F so still safe.


Pete :D :D :D :D
#866
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Metric Target 250 on a 250 on a Red Bike

Pete :shock:
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RGV
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Re: APS/G 250

Post by RGV » Wed Oct 31, 2012 5:56 pm

Hey Pete, nice curve and with a bit of tuning you might get the magic 80 rwhp. What gear was that run in?

So thats 1/4 litre. 78 X 4 = 312 HP per litre. Not bad for naturally aspirated.

Long live the 2 smokers.

Dave

Last Minute Racing
DLRA #928

2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF

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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Wed Oct 31, 2012 6:46 pm

Dave

That's 4th gear, it is all relative I got 63hp with Stock Engine, Ignition and Gutted Pipes small re jet.

Been going round in circles but it finally got there.I think the Sunoco Supreme Fuel is the Magic ingredient.

I am running the 23D10 Kit Ignition Curve up until 9000rpm then took timing out of it and it works a treat.

Pete
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Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
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AuotonomousRX
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Re: APS/G 250

Post by AuotonomousRX » Fri Nov 09, 2012 7:07 pm

Here's a link to the Stock bike on the Dyno


http://www.youtube.com/watch?v=og33riqmNXA&feature=plcp


Pete
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Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

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RGV
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Re: APS/G 250

Post by RGV » Fri Nov 09, 2012 7:42 pm

Hey Pete, same dyno? If so thats a good improvement. No reason for it to seize, plenty of oil being pumped through.

Love It, Never Too Much SMOKE.

Dave

Last Minute Racing
DLRA #928

2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF

internetscooter
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Re: APS/G 250

Post by internetscooter » Fri Nov 09, 2012 7:42 pm

Dynojet add the fudge factor to the result unless you ask for the true rear wheel, without it you need to remove 25% of the number stated.

There was a good article at http://www.hotrod.com/thehistoryof/113_ ... ewall.html but for some reason it has dissappeared - here's what I kept when it was about

The Story Behind the Dynojet Chassis Dyno - The Truth Meter

"Dynojet's final number-fudge was arbitrarily based on a number from the most powerful road-going motorcycle of the time, the '85 1,200cc Yamaha VMax. The VMax had 145 advertised factory horsepower, which was far above the raw 90hp number spit out by the formula. Meanwhile, existing aftermarket torque-cell engine dynamometers delivered numbers that clustered around 120. Always a pragmatist, Dobeck finally ordered his Chief Engineer to doctor the math so that the Dynojet 100 measured 120 hp for a stock VMax. And that was that: For once and forever, the power of everything else in the world would be relative to the '85 Yamaha VMax and a fudged imaginary number."

If you can work out the true rear wheel power you can better guess top speed :)
Paul
---
DLRA #647
89.664 mph (aiming for 100mph+)
Vespa Labs [url]http://www.vespalabs.org[/url]

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RGV
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Re: APS/G 250

Post by RGV » Fri Nov 09, 2012 7:56 pm

Hey Paul, The best thing to do is use the same Dyno to do a before and after run. Then you get a % upgrade. So thats a 24% increase? Nice in anyone's books. (Thats IF its the same dyno)

Dave

EDIT: Not allowing for weather differences.

Last Minute Racing
DLRA #928

2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF

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