Team GPR

[Bert]

Another GPR150 engine rolled out the door to another happy customer yesterday....

Smiles all round; especially when he was already doing very well with the stock engine...


still some refinement/tuning/running-in to be done.
But not bad as a first run up.

[TZ350]

Another GPR150 engine rolled out the door to another happy customer yesterday....

Good work, Buckets is getting more interesting by the day.

CDI PROJECT Day2 Testing. ....... I'll get in another one and try again.

Its a shame I didn't get Regan to video it (was about to ask) it would have been another great Arggghh F##k moment on the GPR dyno.....

Bugger ... and I was feeling sorry for myself over a little software issue, I admire your composure, I feel like a Nancy now. LOL

[Bert]

Good work, Buckets is getting more interesting by the day.
Bugger ... and I was feeling sorry for myself over a little software issue, I admire your composure, I feel like a Nancy now. LOL

yes well; I've finished my two day sulk/drowning my sorrows... back on the horse.

GPR tuned 150 motors... I have to say Scotty & Dave (and Colt Cams), have the build down-packed now in terms of consistency and repeatability.
The last four engines of the production line have produced almost the exact same power curve.
No matter how poorly they started at.



Right given its NYE: here is the 2014 Aims for GPR boys (lets hope we can tick off a few):

1. Get the Superlight F3 bikes running and out for the winter series. 550cc,400cc & 250cc.
2. Dig out the hydroforming kit from the back shed and start playing.
3. More Carbon Fibre parts....
4. Workable CDI...
5. Exhaust systems <90dB (make the bikes super quite so we can sneak up on people)
6. Another Bucket Sidecar
7. Start replacing the RS125 running gear with other stuff.
8. Actually paint all the bikes (I said Paint: not spray bomb Kerry)...
9. Engine Dyno (so we can fettle to our hearts content)
10. 30Hp bucket (got to set the Bar high).
11. Cast our own GPR engine (now its on the list Scotty)...
12. Fuel injection (maybe this item 4)
13. Dig out all the ZXR400s for the 90's carb class.
14. Take "big stinky" to the sidecar "have a go day" in May.




Happy 2014 Everyone

[Bert]

2014 Item 5.

future reference:
http://www.google.com/patents/US7510050

I was under the impression they were just a canister, but no... there is actually a little more too it. JUST.....



blablabla --- its just fluid mechanics boys.... and not alot different in conceptual workings of the original yosi/muzzy link canisters of the 80's.... So who stole what...
blablabla continued --- also a solution deployed in pipes and the likes of power-stations to lesson the effects of cavitation since the early 1900's... blowhearts...


But if it can make the bikes a little quieter without compromising performance then it needs to be explored



In operation, power chamber 110 permits an increase in engine performance through the expansion and contraction of exhaust-sonics through the system. More specifically, power chamber 110 acts as a flow-enhancer by allowing smooth high speed exhaust gases pulses to travel through the system at full velocity, while unsteady exhaust flow is corrected by the additional chamber area available for the rapidly expanding exhaust gases. Preferably, the exhaust pulse enters power chamber 110, where it expands and then cools to permit at least a portion of the exhaust gas to contract. This expansion and contraction effect functions to accelerate the exhaust pulse through the header. In some circumstances, the resulting acceleration may produce a scavenging effect on the exhaust port, permitting a larger charge of air and fuel to enter the cylinder for a more efficient burn.

Additionally, power chamber 110 is adapted to attenuate reflected gas pressure forces approaching the cylinder thereby reducing the tendency of the returning pressure waves to “back up” and hinder volumetric efficiency of subsequent incoming cycles. As exhaust pressure waves hit restrictive points within the exhaust path, a rebound pressure wave is generated back through the exhaust system. Preferably, power chamber 110 is adapted to provide the exhaust pressure wave with an additional area of expansion at a critical point within exhaust system 100. Preferably, power chamber 110 is adapted to “bleed off” pressure as it backs up in the exhaust system 100.

Testing has demonstrated measurable gas-flow increases, through a header system containing power chamber 110, of nearly ten percent. Furthermore, exhaust gas sound emissions from the header system containing power chamber 110 are effectively reduced.

[John_H]

Another GPR150 engine rolled out the door to another happy customer yesterday....

Smiles all round; especially when he was already doing very well with the stock engine...


still some refinement/tuning/running-in to be done.
But not bad as a first run up.

Nice. I will be coming and seeing you guys for the same service once I have managed to save some money up.

[seymour14]

Taumarunui.

[seymour14]

Taumarunui part two...

[seymour14]

Taumarunui, and being attacked by a T-Rex on the way home...

[seymour14]

The T-Rex was so big it would not fit in the last sequence.

[Grumph]

In operation, power chamber 110 permits an increase in engine performance through the expansion and contraction of exhaust-sonics through the system. More specifically, power chamber 110 acts as a flow-enhancer by allowing smooth high speed exhaust gases pulses to travel through the system at full velocity, while unsteady exhaust flow is corrected by the additional chamber area available for the rapidly expanding exhaust gases. Preferably, the exhaust pulse enters power chamber 110, where it expands and then cools to permit at least a portion of the exhaust gas to contract. This expansion and contraction effect functions to accelerate the exhaust pulse through the header. In some circumstances, the resulting acceleration may produce a scavenging effect on the exhaust port, permitting a larger charge of air and fuel to enter the cylinder for a more efficient burn.

Additionally, power chamber 110 is adapted to attenuate reflected gas pressure forces approaching the cylinder thereby reducing the tendency of the returning pressure waves to “back up” and hinder volumetric efficiency of subsequent incoming cycles. As exhaust pressure waves hit restrictive points within the exhaust path, a rebound pressure wave is generated back through the exhaust system. Preferably, power chamber 110 is adapted to provide the exhaust pressure wave with an additional area of expansion at a critical point within exhaust system 100. Preferably, power chamber 110 is adapted to “bleed off” pressure as it backs up in the exhaust system 100.

Testing has demonstrated measurable gas-flow increases, through a header system containing power chamber 110, of nearly ten percent. Furthermore, exhaust gas sound emissions from the header system containing power chamber 110 are effectively reduced.[/I]

I'd call their patent dubious at best...Annan and Roe at Queens University in conjunction with Gordon Blair have prior work published on side resonator silencers - and i thought, patented too...
personally, when i read about Annan and Roe's work i made a side resonator muffler for a road bike in around 1988 or so....

[Bert]

2013-2014 North Island Bucket Championship.
Round Two GPR Summary.
The weekend started off with lovely hot sunny weather. But as forecasted the heavy rain arrived in time for Sunday (race day).
Only Regan (1st) and Scott (6th) qualified for the A-Grade, the rest (Kerry & me) were relegated to B-grade.
A Race 1 (Very Wet 10 lapper)
Regan got another one of his amazing starts and lead from start to finish untroubled. Scott battled up from 6th to 3rd with some amazing speed in the sweeper...
A Race 2 (almost Very Wet 15 lapper)
Regan hole-shotted and lead from start to finish, but was pushed very hard in the last couple of laps by Rick and Scott: whom had shown great control and speed in the wet to move up from 6th.
A Race 3 (Very Very Wet 20 lapper)
Regan hole-shotted and lead most of the race until Scott managed to stick a great pass on him in the sweeper (around the outside); and came home with the Win.
Scott also carded the fastest lap of the day when chasing down Regan.

B - Grade. Seconds and thirds for the boys.
But Race three finished with Kerry (when leading) crashing out after running wide on the grass and sending his bike spinning back across the track sending Brent (second at the time) flying over the handlebars. Great Team work gentlemen...

So overall a great weekend catching up with everyone.
Plenty of fun had by all (including the little GPR future racers who all enjoyed their first weekend away camping at a race meeting).. hopefully not too scared by the experience.


something to think about:
http://www.biker.ie/forum/showthread.php?t=194362

[seymour14]

You will all be pleased to know that things are progressing well, and am hopeful to be called down to the track sometime in near future to do a "noise test" (may take a scooter...!). Won't happen in time for this seasons N.I, but fingers crossed things progress smoothly and we may be re-invited back into the fold.

Let you know as things progress...

[codgyoleracer]

yes well; I've finished my two day sulk/drowning my sorrows... back on the horse.

GPR tuned 150 motors... I have to say Scotty & Dave (and Colt Cams), have the build down-packed now in terms of consistency and repeatability.
The last four engines of the production line have produced almost the exact same power curve.
No matter how poorly they started at.



Right given its NYE: here is the 2014 Aims for GPR boys (lets hope we can tick off a few):

1. Get the Superlight F3 bikes running and out for the winter series. 550cc,400cc & 250cc.
2. Dig out the hydroforming kit from the back shed and start playing.
3. More Carbon Fibre parts....
4. Workable CDI...
5. Exhaust systems <90dB (make the bikes super quite so we can sneak up on people)
6. Another Bucket Sidecar
7. Start replacing the RS125 running gear with other stuff.
8. Actually paint all the bikes (I said Paint: not spray bomb Kerry)...
9. Engine Dyno (so we can fettle to our hearts content)
10. 30Hp bucket (got to set the Bar high).
11. Cast our own GPR engine (now its on the list Scotty)...
12. Fuel injection (maybe this item 4)
13. Dig out all the ZXR400s for the 90's carb class.
14. Take "big stinky" to the sidecar "have a go day" in May.




Happy 2014 Everyone

Dont give Scotty too much to do, He'll get grumpy.......... and demand alcohol :-)

[koba]

You will all be pleased to know that things are progressing well, and am hopeful to be called down to the track sometime in near future to do a "noise test" (may take a scooter...!). Won't happen in time for this seasons N.I, but fingers crossed things progress smoothly and we may be re-invited back into the fold.

Let you know as things progress...

Cool, we have to be REAL HARD on nylon from the start if anything gets going.

Also worth discussing the wording of resource consents...

[koba]

Dont give Scotty too much to do, He'll get grumpy.......... and demand alcahol :-)

Makes his own doesn't he?

Like Motorbike, Build 10.

Like Alcohol, Build some.