111 risposte a questa discussione

[Jeram]

I am committed to getting this bike finished this year, hopefully dynod within 6 months.
So I have organised to employ my machinist to take 1 day off from work each month to work on this bike

some more news: because 65rwhp was not enough I am commissioning Stefan (whom I believe is on this forum) to design and cast me a GP spec cylinder.



not much to do now,

-rear brake set up
-head stay mount (using a vibration dampening engine mount from a Toyota Camry)
-electrical wiring
-install an LT500R rod on the crankshaft, re-balance the crankshaft for high rpms, install the new cylinder
-dyno testing and possibly compare our current carb (shortened PWK41.5 oval bore) to a 44mm power-jet Lectron

[sognandolamito]

Why do you want to use a very expensive Lectron carburetor?
At the same price you can put on a high-end ECU and turn your engine to EFI.

Saluti
Niko

[Jeram]

Because a lectron costs only $320 so it is very affordable, while making more hp than EFI

The EFI has the advantage of being able to run a very large throttle body, but this advantage is only useful on a disc valve motor because on a reed valve motor the reeds are a very large air flow restriction.


http://www.lectronfu...carburetor.html

Messaggio modificato da Jeram il 10 February 2013 - 04:11

[sognandolamito]

Jeram, il 10 February 2013 - 04:08, ha scritto:

Because a lectron costs only $320 so it is very affordable, while making more hp than EFI

The EFI has the advantage of being able to run a very large throttle body, but this advantage is only useful on a disc valve motor because on a reed valve motor the reeds are a very large air flow restriction.


http://www.lectronfu...carburetor.html

Oh, I thought it was more expensive than 320$.
I don't understand if you think that EFI is high-performance than carburettor or the opposite.
EFI has the advantage to keep the correct stoichiometric ratio in every situation of load, temperature ad humidity.
On a 2 stroke engine you can also use a feedback from a thermocouple (very thin, about 0,5mm for fast response) to stay tuned in every moment.
I don't undestand your speaking on reed valve and disc valve. We've some examples of reed valved carburettor engine turned on EFI that goes better in every situation.

Jeram, where're you from?

Saluti
Niko

[TheStig22]

sognandolamito, il 10 February 2013 - 16:04, ha scritto:

Oh, I thought it was more expensive than 320$.
I don't understand if you think that EFI is high-performance than carburettor or the opposite.
EFI has the advantage to keep the correct stoichiometric ratio in every situation of load, temperature ad humidity.
On a 2 stroke engine you can also use a feedback from a thermocouple (very thin, about 0,5mm for fast response) to stay tuned in every moment.
I don't undestand your speaking on reed valve and disc valve. We've some examples of reed valved carburettor engine turned on EFI that goes better in every situation.

Jeram, where're you from?

Saluti
Niko

if I remember correctly he is Australian

[Jeram]

Yes I'm from Australia. The two people I know who have put EFI on their high power reed valve two strokes have in the end gone back to carburettors after years of struggling to get it running better than a carb.
Smurph (the father of aftermarket 2T EFI): rz350
Hybrid (admin of 2strokesdownunder forum): rz500 v4
Both complained of the same issues, namely throttle response and spent years trying to get the efi as good as a carb. In the end the swapped back.

On a 125 or 250 you could probably get away with poor response but on a 100kg bike with as much torque as a gsxr750 its a different story.

I'd personally just put carb on the bike and have in running perfectly with minimal hassle as there will be many things on this bike that already need setting up. If I add another variable I will be 'chasing my tail' for years trying to get it running
For me the time, cost and effort of setting up efi isn't worth the gains

[Jeram]

We are hoping the start the bike at the end of this month.

I am flying up to work on the bike for four days to get alot of the little remaining jobs out of the way like the wiring and the last few peices of the pipe.

Then hopefully once all of that is done we will be ready to push it down the road and brind her to life for the first time

[nelson22]

Wow! Nice!
Post a video if you can :-)

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[Jeram]

will see how we go

we've got at least a days worth of welding to do first to get the pipe completed, then we will have 2 days remaining to do the rest.

If we get it started i will defnitely be taking a video, and if we dont quiet get it started I will be back up there very soon to finish it off and put it on the dyno

[Jeram]

Here we go guys, an update from the weekend...

As expected, we got painfully close to firing up the bike for the first time.
We were just short of a few engine mount bushes and perhaps a roller starter.

What we did achieve though was some bloody good progress over a solid 3 1/2 days in she workshop. The bulk of the time was spent finishing off this absolute beauty of an expansion chamber which took the two of us a solid few days to complete.
The rest of the time was spent doing the other odds and sods required to complete the bike including coolant/plumbing, installing and wiring up the ignition, fuel delivery/overflow/vents, carb jetting and generally checking over the entire bike to find any outstanding issues.

All in all we ended up with a 99% complete bike that just requires a head stay and PV system prior to being brought back to Melbourne where I will finish off the little details myself (paint, dyno tuning, CNC rear caliper bracket) over a few solid weekends.

Mocking up the last few pipe sections, which we definitely the most difficult as the had to fit between the swingarm, rearsets, rear tire and come out under the bike at the correct angle for aesthetics.






The new headstay and frame mounted bracket,


The finished pipe













We've also organised for an A-grade rider to help us set up the bike and race it in a couple championship races to see what the bikes full potential is. I'll be riding it also in between.

Hopefully I'll have the bike freighted back to me in a few months where I can finish off the final details before entering in a few events.

[bubagan]

whaou, amazing expansion chamber, it's enormous. This bike is a light-weight dream, how many kg does it weight? lot of things can be done to reduce the weight yet. the front brake discs are very big, i believe you can use a 298mm brake discs or lsmaller to brake this awesome bike. still magnesium or carbon wheels can be replaced with this standard aprilia OZ.

Anyway, wow, sometimes i had the fool idea of creating a mito 250cc's with a cross engine, but this is holy shit, KTM 380cc engine on a mito, pfiiuu, only the bigger cr 500 engine with a CPI cylinder can outstand this one. well done jeram, try now to finish it soon and use it, it will be dangerously funny.

ps. waiting for a video of the bike on the rear wheel!

Messaggio modificato da bubagan il 02 July 2013 - 09:31

[Jeram]

Thanks,

yes, it Should weigh around 110kgs, but not too concerned about lowering weight further at this stage as I think spending money on good tires and 1-on-1 racing tuition with a professional racer would yeild quicker laptimes
Perhaps in the future I will go down the path of weight reduction, but for now I just want to get it running.

Messaggio modificato da Jeram il 02 July 2013 - 09:40

[Jeram]

Next weekend: driving 1200kms to Finish off the ktmito so she can be fired up, then bringing her home with me so I can do the final cosmetics and fairings in melbourne in my shed.

[TheStig22]

[Jeram]

Very happy to report that after 4 years of work I got the bike going tonight.

The bike starts, runs and rides nicely. The vibrations are managable and pulls cleanly from idle.

We hope to have her on the dyno shortly and be on the racetrack in the newyear.

I would like to take the opportunity to thank Lozza from two stroke institute for his dedication in assisting me from start to finish with this bike. Im looking forward to seeing what he does now with all the free space in his shed and newly freed up weekends haha.
I hear that there is a very tasty TZR421 3MA project already underway with lashings of carbon and top spec bits.


Now, for the main event:




http://youtu.be/DxcxDEA2mCU

[Jeram]

[aroe]

Che spettacolo...

[TheStig22]

Finally you can say "It's alive!!!!!"

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[DaniErre]

Holy Shit!!! Congratulations! I can't wait to see a detailed test ride!

[Jeram]

Just a little update:

its been a busy few weeks but I've had a little time to do some jobs on the bike.

I refurbished the rear subframe last week which including removing it from the bike, stripping the paint, removing rust, prepping the surface and painting it with a rubberized paint.

I then moved onto mounting the fairings which included ordering new fairing mount brackets, making a belly pan widener using sheet aluminium, and making a front subframe.

The front subfame was made from 10x1 aluminium tubing that I fabricated to fit.


Photos:

the bike looks phat without the seat unit on.





starting to fabricate the front subframe


the subframe finished






how she sits now




Im now just waiting for a local machinist to make me a few small components, then all the bike needs to be 100% ready to race is Paint, powervalve linkages and the rear caliper sorted.