APS/G 250

See cars and bikes being built for the salt

Moderator: DLRA

User avatar
BONES
Posts: 352
Joined: Wed Mar 15, 2006 4:28 pm
Location: Killara Sydney

Re: APS/G 250

Post by BONES » Wed Jul 05, 2017 8:26 pm

Hey Pete
Do you have a picture of you on the bike when you are tucked in?
From the photos it looks like your head will be above the steering head and your shoulders too close to the bars to
give a good tucked riding position.
I think this new chassis is a great start for some good speeds.
My worn out 350 went 140 and I think your chassis is potentially better with the rear engine than my front engine.

cheers Bones

User avatar
AuotonomousRX
Posts: 623
Joined: Wed Jan 06, 2010 10:05 pm
Location: Eyre Peninsula SA

Re: APS/G 250

Post by AuotonomousRX » Sat Jul 08, 2017 10:57 am

BONES wrote:
Wed Jul 05, 2017 8:26 pm
Hey Pete
Do you have a picture of you on the bike when you are tucked in?
From the photos it looks like your head will be above the steering head and your shoulders too close to the bars to
give a good tucked riding position.
I think this new chassis is a great start for some good speeds.
My worn out 350 went 140 and I think your chassis is potentially better with the rear engine than my front engine.

cheers Bones
Hey Bones

Your Build Philosophy about Low Slung Bikes was one of the many factors in making this Bike ......

I have had a Computer malfunction and can't access my old pics .....

Yes my Helmet sits on top of the triple tree .....

but thanks to the Leading Link Forks I am using, the bottom of the Triple tree is lower than top of the front wheel .......

When I did a comparison with other pics of Low Slung Bikes using dropped Telescopic Forks, I looked at the Helmet Position relative to the top of the Wheels ......

and my Helmet is in fact lower than most .....

and I get a very tight, narrow tuck with the Drop Handlebars I've made ......

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

Pete :shock:
DLRA #866
SATA #49

User avatar
AuotonomousRX
Posts: 623
Joined: Wed Jan 06, 2010 10:05 pm
Location: Eyre Peninsula SA

Re: APS/G 250

Post by AuotonomousRX » Fri Sep 29, 2017 10:01 am

The Engine is ready to go again ..... I found the Power Valves where not quite opening fully, all good now ....

Image

Pete :)
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

User avatar
RGV
Posts: 661
Joined: Sun Feb 06, 2011 9:17 pm
Location: Adelaide Hills

Re: APS/G 250

Post by RGV » Fri Sep 29, 2017 8:21 pm

Looks good Pete. 8) How far from full were the PV's.

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

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:(

User avatar
AuotonomousRX
Posts: 623
Joined: Wed Jan 06, 2010 10:05 pm
Location: Eyre Peninsula SA

Re: APS/G 250

Post by AuotonomousRX » Sun Oct 01, 2017 6:50 am

RGV wrote:
Fri Sep 29, 2017 8:21 pm
Looks good Pete. 8) How far from full were the PV's.

Dave
Less than 1mm Dave but still an obstruction.

They were fully open as far as adjustment but it was the shape of the section at the rear of the Power Valves I had to trim to match the ceiling of the exhaust port ..... (that is the silver on the PV in the pic)

Image

Now when the are fully open they are actually fully opened .....

It might explain the difficulty I have had getting the usual "over rev" in my engine.

(I have a second set of valves in case) :wink:

Pete :)
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

User avatar
AuotonomousRX
Posts: 623
Joined: Wed Jan 06, 2010 10:05 pm
Location: Eyre Peninsula SA

Re: APS/G 250

Post by AuotonomousRX » Thu Oct 12, 2017 12:41 pm

Experimental New Pipes designed to lift the Peak Power/RPM x 1000 ......

I used the MOTA 2 Stroke Software (Thanks Dave) and many many hours to come up with the shape ....

It will be interesting to see if the small loss of Torque or the Rise in Peak RPM will win out ......

Image

Pete
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

Stayt`ie
Posts: 896
Joined: Fri May 13, 2005 11:47 pm
Location: Mackay

Re: APS/G 250

Post by Stayt`ie » Thu Oct 12, 2017 4:47 pm

Depends on how far torque falls away from hp "after peak",, the closer you can keep them, the more top speed you will see 🙂
First Australian to ride a motorcycle over 200mph at Bonneville,,,

User avatar
AuotonomousRX
Posts: 623
Joined: Wed Jan 06, 2010 10:05 pm
Location: Eyre Peninsula SA

Re: APS/G 250

Post by AuotonomousRX » Sat Oct 14, 2017 9:17 am

Stayt`ie wrote:
Thu Oct 12, 2017 4:47 pm
Depends on how far torque falls away from hp "after peak",, the closer you can keep them, the more top speed you will see 🙂
Ron with my current Engine configuration, the peak of the Torque/HP occurs at the about same RPM, HP "holds on" for extra 100 RPM, then both dramatically fall off ala a normal Tuned 2 Stroke Curve ......

I have found the RGV/Aprilia Engine relies on a narrow optimum Peak RPM window to extract Max potential HP/Torque .... ( different from the Power Band which is always occurs over a 3500 RPM range with Exhaust Power Valves set properly)

I am experimenting with pushing the Peak RPM up ( = very small HP increase - small Torque drop) which can be done by changing the Length/Shape of the Pipe.

This allows me to use different Gearing ..... It is all a Juggle to see if I can find an extra couple of MPH .....

All will be revealed on Thursday at Speedweek :D

Pete
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
SATA #49

Post Reply