[Technique] Réalisations de Maarten JANSSENS

a next step in the HP2 enduro project:

As you maybe know I have a HP2 sport and 2 HP2 enduro's here and me and my father are rebuilding one of those enduro's to work with carburetors! my sponsors dpns racing parts ([Vous devez être inscrit et connecté pour voir ce lien] has milled these parts that I designed to fit the carbs on the engine!

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next step is making a stand-alone igintion because ignitech couldn't handle the 64 teeth of teh bmw timing wheel....  

grtz

MJ

P.S. have a race with the supermono on mettet next weekend ( 18/05 ) and won't be able to put it on the dyno so anyone that has a good idea how I can make it run good without a dyno run?

without a dyno !!! that's hard

anyway , if your exhaust lenght is ok , if your silencers diameter is ok ( not more than 50 mm Inside , and not more than 40 mm outside ) , if your airbox is wild open , you shoud be ok

there is something to gain ,in taking away the sparkplug seal ring , I made it and it's better ,  always   

do you have the tune-ecu cable  ? , if so I will send you a good EFI and EPT map  

fd-racing a écrit:

there is something to gain ,in taking away the sparkplug seal ring , I made it and it's better ,  always   

  

I don't understand this, maybe because I don't know the KTM motor? Could you explain more, ou bien en français que je le ré-traduise vers l'anglais ?

Maarten, a really crude solution for the map if you have no other option: in principle the amount of fuel you put in per revolution is proportional to the torque. So you might hope that the torque curve and hence map will remain as before up to 6000 rpm, but will now drop away more slowly at full throttle. If you plot the injector opening times for a range of throttle openings against rpm, your previous map will probably show the full throttle curve dropping much faster than the small throttle settings as the airbox and pipe choke it. You might be able to hope that an open airbox & freer pipe will let the engine breathe as well at full throttle as it used to do at 30%... so use the relative reduction in fuel from you 30% curve, and apply it to the 50% and 100% curves.

If you can easily swap maps, make a couple of versions like this and you should be able to get something workable.

Of course if you have a WB lambda, you are ok...  

removing the seal ( I even mill the spark seat sometimes )  will bring the spark itself  more in the center of the combustion chamber , on this engine it's about an 1/2 hp everywhere a bit more at peak torque  

in making a good  exhaust line , especially on this engine the goal is not to make a freer pipe , only.

the goal is to exhaust the more gas as possible in keeping the more inlet gas as possible Inside , and so , having the best dynamic comp ratio , and finally the best torque , because it's all a matter of torque

thats why every diameter has it's importance , and every lenght too ...

his long pipe was acting like a tap  , and his big end silencer cooled too much his gas decreasing drastically their speed  , that's why he has peak torque at 4000 rpm !!!! , it normaly happens around 6000 rpm

Running the bike with fuel map "as is" on the new exhaust seems dangerous to me.  
Everone agreed it will flow a lot more air. Without (heavy) remapping, the engine will run very lean from about 5000 up to top. At least, add 5, 10 or even 15% fuel in areas it supposed to run very different (better) from the previous exhaust.
Running rich will loose power too, but you will not loose your exhaust valves and seats

And if competitors comme to you saying "your bike is smelling fuel", it will be time to decrease these values  

Angelo

fd-racing a écrit:

removing the seal ( I even mill the spark seat sometimes )  will bring the spark itself  more in the center of the combustion chamber

Ah! Now I understand   

MJ-Works a écrit:

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ready for testing :)

Hi MJ

beautiful   

Seems to me you would gain on gas speed and probably a little weight also with hydroforming technic.
I first saw this by Millet for 2str exhausts, titanium should be more tricky but with some care on preheating etc.
why not... this guy failed at first try

 

fd-racing a écrit:

removing the seal ( I even mill the spark seat sometimes )  will bring the spark itself  more in the center of the combustion chamber , on this engine it's about an 1/2 hp everywhere a bit more at peak torque  

Changing a parameter, gaining 0.5HP and telling this gain is only comming from this change looks strange to me.

Question, and I admit beeing wrong: Could this gain be due to tests not running at the exact same conditions, even if they are run within minutes. Time to stop everything, change the sparkplug, re-run the motor, etc... will probably change room temperature, engine temperature, tire temperature,... and all these small differences in test conditions will give you the 0.5HP gain you see. In different conditions, you will probably see a 0.5HP drop.

Angelo

THANK YOU for all the responses here!    

Polux rsv a écrit:

fd-racing a écrit:

removing the seal ( I even mill the spark seat sometimes )  will bring the spark itself  more in the center of the combustion chamber , on this engine it's about an 1/2 hp everywhere a bit more at peak torque  

Changing a parameter, gaining 0.5HP and telling this gain is only comming from this change looks strange to me.

Question, and I admit beeing wrong: Could this gain be due to tests not running at the exact same conditions, even if they are run within minutes. Time to stop everything, change the sparkplug, re-run the motor, etc... will probably change room temperature, engine temperature, tire temperature,... and all these small differences in test conditions will give you the 0.5HP gain you see. In different conditions, you will probably see a 0.5HP drop.

Angelo

believe me when i say what i say    lol , and i tried almost everything possible with this engine , the best gain is the plug 3 mm down , if you raise the plug 2 mm from stock you start loosing , and a lot !!!

Just got back from 2 races on Mettet this weekend. I didn't like the track at all (to short an to much slow corners)

BUT the bike worked very well! New exhaust is clearly better and chassis responds very good to changes.

I only had 2x15 min. of practice before the race and never had ridden there before so not optimal...

Did have fun though   

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grtz

MJ

Nice   

MJ-Works a écrit:

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Humm, your topic is in the wrong place, even if it's not a conventional bike... I can see this one works with electricity!!!   

MJ-Works a écrit:

Just got back from 2 races on Mettet this weekend. I didn't like the track at all (to short an to much slow corners)

I don't like it either, can't say why but not becaue it's short (for example, I like Croix en Ternois).

great bike btw, hope to see it in action one day, and bring your stroker to that day   

first point:

next weekend (after motogp at assen) the LC4 engine will opened up, I will mill the head down for more compression (thank you @ fd-racing for the tips) and install the new piston.

second point:

NEW PROJECT has started!

I started design on a whole new bike. This one will have a self made structural (!!!) engine, ones I finished some sketches I will put them online

regards!

MJ

Yeahh that rocks!

It's a very big job but I think that the structural engine is the right thing (I'm a Britten fan)
I was thinking to take all the inside of an existing engine like KTM LC8, and put them in a all new casing. For me it's just an idea and i won't do it before yeaaaaaaaaaarssss.

So i'm happy that you start a porject. I'm confident you will do it good.
Can't wait to see your sketches.

Great!!!   

Hallo guys,

I'm racing in the EC supermono on oschersleben with my mono during the WC endurance weekend there.

I'll be in the paddock from 21/08 until sunday evening. If you want to have a look at my mono or have a chat I'd love to see you there!

I'm putting this here because I know how crazy you guys are about endurance so I think there might be a chance that one of you is there?

cheers!

Maarten

>Good luck for the race!!!!!!!!!!!!!!!

Update:

Point 1:

Got ran of by another rider during qualifying @ Oschersleben speedweek. Broken colarbone and 2 cracked ribs

Supermono damage was "ok" but it needs work. I'll post pictures of the upgrades if I make them.

Point 2: I started work on a Moto2 frame!!!

Because the R6 from yamaha has a much better engine than the cbr600 from Honda I decided to try and make a lightweight frame round the R6 engine that has to give the same confidence that the cbr600 chassis gives.

I'm planning on making a kit frame that holds the original swinging arm and suspension, fueltank, fairing etc. So you can just buy the kit and keep all the other original parts. I've also found a professional testrider to help develop the chassis!

Donor bike:

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First 3D from rear chassis part:

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Ans as you know I have good examples to learn from (Kalex moto2 frame from the champion tito rabat himself!)

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I'll post more 3D drawings later this week.

GRTZ

MJ

Bad and good news!

Thanks for telling us.



Have a quick recovery!

Marc a écrit:

Bad and good news!

Thanks for telling us.



Have a quick recovery!

the race was 2 or 3 months ago so I'm allready recovered but thanks anyway!

So, very quick "virtual" recovery!
Good!
:)

Hum... And what are you doing during you free time???
Great recovery, and great projects, one more time!!

Hey Martijn,
Have you weighed the stock R6 frame?