Rule change submissions close 1 March 2016 - be in to win.

[husaberg]

I am not sure what 1.5m3/s looks like and even with ducting if a motorcycle moving at an average of 60km/hr is able to pass that much air over the engine.

It looks like a pod and a half per second.


Stephen AKA Briandemarge has done clever like calculations for aircooled bikes before.
I will quote him in order to ask him to post them.

Hahahaaaa. Didn't see that one coming

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[goose8]

if his bike and him self is the same weight as me and bike i would beat him in a 10 lap race every time

His weigHt advantage does help him a lot for sure?

[mr bucketracer]

His weigHt advantage does help him a lot for sure?

yes like 50-60 kgs , he could not even stand up with that on his back lol

[mr bucketracer]

I think it would be interesting as my fxr is so ruff to ride to the 2t there is no doubt in my mind he is a good rider. him and his bike are the complete package in my mind.

yip the package

[goose8]

yes like 50-60 kgs , he could not even stand up with that on his back lol

Haha yes I think he is going to have a T least 40kg on me in f5
So will be happy if I can keep him in sight for couple of laps

[mr bucketracer]

Haha yes I think he is going to have a T least 40kg on me in f5
So will be happy if I can keep him in sight for couple of laps

i'm shore you will , good times you were doing last time , feel like given you my 4 stroke to ride ,at least you will last over 16 laps lol

[TZ350]

I'm still waiting for a doomsday 110cc 2T to be built.

You might not have to wait that much longer, 110cc water cooled 2T.



Porting lovelyness

This plenum (on an air cooled engine) has been test ridden at Mt Welly and performed Ok.

I would describe the plenum as softening the throttle response but this had an up side as it was possible to start opening the tap much earlier and get the wave action in the pipe really building up by the time we were exiting the corner, so it launched much harder.

There was another up side to the plenum. On the dyno, depending on configuration (resonance) I could get a big torque boost in the lower rpm range. This could be very useful. A possibility is a variable volume plenum or more practically a plenum divided into two different volume chambers.

[TZ350]

It looks like a pod and a half per second.



Stephen AKA Briandemarge has done clever like calculations for aircooled bikes before.
I will quote him in order to ask him to post them.

That looks like a lot of air, it will be interesting hear what Brian has to say.

[goose8]

i'm shore you will , good times you were doing last time , feel like given you my 4 stroke to ride ,at least you will last over 16 laps lol

I'd love to have a couple of laps on one of the gpr150s At some stage .will see on Sunday how close I can get to Nathaniel in f5

[husaberg]

That looks like a lot of air, it will be interesting hear what Brian has to say.

It does seem a lot, but remember at peak revs, your engine is both consuming and exhausting about the same amount, each and every minute, All through a 24mm and about a 20mm orifice respectively. Plus air is generally pretty abundant at race tracks.

[F5 Dave]

You might not have to wait that much longer, 110cc water cooled 2T.

Porting lovelyness

This plenum (on an air cooled engine) has been test ridden at Mt Welly and performed Ok.

I would describe the plenum as softening the throttle response but this had an up side as it was possible to start opening the tap much earlier and get the wave action in the pipe really building up by the time we were exiting the corner, so it launched much harder.

There was another up side to the plenum. On the dyno, depending on configuration (resonance) I could get a big torque boost in the lower rpm range. This could be very useful. A possibility is a variable volume plenum or more practically a plenum divided into two different volume chambers.

If you'd put that GP in a decent chassis with a six speed box you'd get a bigger jump than engine configuration.

[TZ350]

http://www.trademe.co.nz/home-living...1035878828.htm



There are possibilities, plenty of hi volume/pressure air directed to where its needed.

[F5 Dave]

if his bike and him self is the same weight as me and bike i would beat him in a 10 lap race every time

So you'd have a better handling bike with more power and a better spread and the same weight which would hurt a peaky bike proportionally more. Yeah it would certainly help for sure.

It's not fair that kids are light, but at over 80kg I'm more than a bit heavy for a 50 so I know the feeling.

[TZ350]

If you'd put that GP in a decent chassis with a six speed box you'd get a bigger jump than engine configuration.

MC18 chassis, RS forks and rear shock, splitter plate so a six speed can be fitted. When it is ready (hopefully soon) the water cooler is intended to replace the air cooled engine.

[F5 Dave]

aaand that's what I'm talkin about.