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

[Brian d marge]

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.

9mm between fins and a short path from heat source to coolant

When I get home I'll find the doc and post it

Hope it's of some help

If I stop off at pub .......but I try to remember

Sent from my SC-01G using Tapatalk

[FastFred]

A 24mm restrictor has 44% more area and so by the same math will flow 130HP+ At the very minimum with a nice restrictor I would say 40hp is possible. I wouldn't be surprised if it was more at all.

HOWEVER - Just because cooling limit comes before intake air limit, it does not mean that the rule has no effect the class. Careful consideration of restrictor design, carb selection, tuning and engineering outside of the normal scope of two stroke building is required to make it all 'click'.

From what I read. A 24mm carb is not going to hold back a 110 water cooler or 124 air cooled Bucket. But the engineering required will hold back a few who lack the resources or inclination to do the development required although that is not much considering TZ has posted details of how its done.

So in a real sense the 24mm carb restriction does not matter much one way or another.

[mr bucketracer]

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.

how do you know that ?i swaped my bike with kobas and i could pull up on my bike so what dose that say ? seen i had not raced a 2 stroke bucket in 15- 20 years

[jasonu]

So in a real sense the 24mm carb restriction does not matter much one way or another.

Then there is no reason to get rid of that rule.

[F5 Dave]

Well you've posted some nice dyno curves over the years and your frames are an improvement over the NF4 no question (only a short ride on Brents 100 showed me that). You'd go a squat load faster on my bike than the other way around as I struggle to adapt to 4strokes.

[cotswold]

I like all the new capacity changes and have built this one for the GP, I have left the engine stock for now but if needs be I'll get a few tweeks done to it for the coming season

[seymour14]

I like all the new capacity changes and have built this one for the GP, I have left the engine stock for now but if needs be I'll get a few tweeks done to it for the coming season

Can't see a derbi part on it, but I do spot a racing Ferrari badge...protest!

[TZ350]

We have a European engine 50cc 2T bike doing 30s, or less, can't remember. On top of that we now have Gary on the John Connor Honda XL100 also in the 30s. You couldn't get 2 much more different bikes and yet it will be only them and Tim, if he turns up, battling at the front of F5.

What happened to all those old 125cc 4T bucket racers, they certainly don't seem to fit in F4 anymore.

Would opening F5 up to them have any merit?

Something like:-

F5
50cc 2T
100cc 4T
125cc 4T two valve air cooled.

[Bert]

What happened to all those old 125cc 4T bucket racers, they certainly don't seem to fit in F4 anymore.

Would opening F5 up to them have any merit?

Something like:-

F5
50cc 2T
100cc 4T
125cc 4T two valve air cooled.

125 4t.
I'd see a few issues forming esp with pit bike motors....
I'm struggling with the concept of making everything bigger especially if we make no effort to improved safety (brakes etc.) runoff zones blablabla.
All we are doing to increasing Hp and speeding up the bikes more and more.
Kart tracks will soon be too small and not match the Hp.

[cotswold]

What happened to all those old 125cc 4T bucket racers, they certainly don't seem to fit in F4 anymore.

Would opening F5 up to them have any merit?

Something like:-

F5
50cc 2T
100cc 4T
125cc 4T two valve air cooled.

oi leave F5 out of the shit fight, it aint broke

[cotswold]

[QUOTE=TZ350;1130949255]What happened to all those old 125cc 4T bucket racers, they certainly don't seem to fit in F4 anymore.

Would opening F4


Something like
125cc 4T two valve air cooled turbo or supercharged left in F4

[TZ350]

125 4t. I'm struggling with the concept of making everything bigger...

Yes agreed, but 125 air cooled 2 valve 4T's have been run for years and now to keep them active, they maybe need a new home (retirement home .... ), would they be out of place in F5?

[TZ350]

What happened to all those old 125cc 4T bucket racers, they certainly don't seem to fit in F4 anymore.

Would opening F4 Something like 125cc 4T two valve air cooled turbo or supercharged left in F4

Yes just thinking of the old naturally aspirated two valve air cooled 125cc 4t's like the Honda 125.



There must be quite a few around still but they aren't brought to the track anymore.

[cotswold]

Yes just thinking of the old naturally aspirated two valve air cooled 125cc 4t's like the Honda 125. There must be quite a few around still but they aren't brought to the track anymore.

i have no problem seeing the old school 125's in with F5 it would bump the numbers up but would rather they had their own classification, I wont see which way Gary has gone and he's on a 100

[goose8]

i have no problem seeing the old school 125's in with F5 it would bump the numbers up but would rather they had their own classification, I wont see which way Gary has gone and he's on a 100

The cb100 was going good today, are you coming tomorrow?