A crashed Bucket

[husaberg]

It would be cheap, I thought that was the bums on seats point.

It was about bums on bikes not bun fights, so don't get cross.

[TZ350]

... clearly an improvement in spread straight away.

Yes 150rpm extra, not to be sneezed at for sure, but not the big power difference up top one might have expected.

Rob. You always drastically shoot down anyone else getting an amendment but try push something that suits you and often disproportionately. That is self interest personified.

My current proposal opens a way for you to use later technology and newer engines that you can get good water cooled cylinders for relativly cheaply. And put something together that is lightweight with reasonable power and reliable and could foot it with the best 4T's.

You already own the basis for one of these pointy end racers, all you have to do is the work. Not much is involved, all easy to get stuff, aftermarket 70cc cylinder, scooter pipe, small turbo and your away, no de stroked cranks, or ferreting around for that hard to find piston etc, none of that old school Bucket plava just a good honest reliable engine that is in current production fitted with store bought aftermarket parts. Nearly anyone could do it.

What surprises me is that someone would put in a proposal that erodes the already disadvantaged air cooled 125's even further and is then offended when its opposed. I like the idea of KT100 pistons, it makes sense but you need to think inclusively.

[TZ350]

I think this is a futile debate the only way around this impasse it is to ask for a rule amendment banning any ethanol based fuels Pretty sure the majority of the 4T brigade would back that.....

I am pretty sure the 4T majority like being able to legally fill up with 98/E10 and add a bit of octane boost if they want to on their way to the track. For me, I like to pre mixing my oil in Av gas, with that rule gone, everyone is legally happy.

It was about bums on bikes not bun fights, so don't get cross.

Love it .... and this is probably the debate we should have had before the proposed 107cc rule change was submitted because in itself KT100 pistons are a real good idea.

[Yow Ling]

When was the last time a bucket was tech inspected ?
Do what you like, nobody will check

[TZ350]

When was the last time a bucket was tech inspected ?

There was talk of it at the last GP, something like the first three plus two at random but another issue got in the way (saved you guys, no need to thank me ... ). It would have been easy enough as Robin, the MNZ official had a nearby motorcycle business.

[kel]

The ethanol fuel which would obviously benefit some subclasses more than others.(his augment that it would not)

Was there ever a rule amendment request put forward, NO there was not. It was debated on here and the general consensus was no so there it died. I have never requested a rule change, Its true I have supported the sensible ones, and its also true I have submitted arguments against the ones that favour one group of owners/racers over others. If that's self serving then so be it, I'll wear it with pride

[chrisc]

Wasn't this thread about "A crashed bucket"?

Just saying

[TZ350]

Talking about fuel, while trying to sort out the EFI thing I had swapped from Av Gas to 96 to save some money, Well the up shot is I poisoned myself with the 96 oct fumes and became sick to the point where I have had to leave the dyno alone. 10min exposure to 96 oct now leaves me sick for the best part of the following day. This never happened with Av Gas, I guess the lead is killing me in a different way but I did not feel sick after 2-3 hours on the dyno using Av Gas. From a health point of view my preferred fuel would have to be E85, Kel is right E85 has a lot going for it.

[kel]

Kel is right E85 has a lot going for it.

Make that E100 and we could drink the left overs at the end of a hard days racing

Sorry Chris, you were saying something about crashing your bucket?

[chrisc]

Sorry Chris, you were saying something about crashing your bucket?

You miss heard me, I was talking about you crashing trying to chase Cricket.

[F5 Dave]

Yes 150rpm extra, not to be sneezed at for sure, but not the big power difference up top one might have expected.



My current proposal opens a way for you to use later technology and newer engines that you can get good water cooled cylinders for relativly cheaply. And put something together that is lightweight with reasonable power and reliable and could foot it with the best 4T's.

You already own the basis for one of these pointy end racers, all you have to do is the work. Not much is involved, all easy to get stuff, aftermarket 70cc cylinder, scooter pipe, small turbo and your away, no de stroked cranks, or ferreting around for that hard to find piston etc, none of that old school Bucket plava just a good honest reliable engine that is in current production fitted with store bought aftermarket parts. Nearly anyone could do it.

What surprises me is that someone would put in a proposal that erodes the already disadvantaged air cooled 125's even further and is then offended when its opposed. I like the idea of KT100 pistons, it makes sense but you need to think inclusively.

I don't have a spare Derbi. I have an F5 bike.

I also don't have the money to start again with cheque book parts for an F4. Or the youth and time to risk a turbo development path. I wish I'd started with something better than the MB. I've done little development. Mostly re engineering problems.

[speedpro]

I wish I'd started with something better than the MB.

blasphemy!

[TZ350]

On the motors that broke their pins was the de stroking done with an offset pin or by offsetting the pin hole?

Is there a bigend pin size like 22mm that would be suitable to use for de stroking by offsetting the pin hole itself.

How much de stroke are we talking about, so we could use the full range of KT pistons in a MB100.

Is there a better rod combo ie longer rod and bigger big end pin that would add something to the MB's performance ie more crankcase volume (if thats needed).

How many people want to run MB100's

Would a square ish engine close to 52x52 be better ie 110cc than an over square de stroked engine (would mean plus 10% for everyone though)??

I am not sure if I can help, but does anyone have a spare MB100 crank I could look at? preferably one I could take apart.

[F5 Dave]

Stepped broke despite generous radiud, but Mike's million dollar made from scratch ones survived. Offset is what using now which undermines the seal surfaces and magnitude harder to setup than boring an existing hole bigger which is child's play by comparison. You have to go to 48.3 to run up to 52.3 could be .2 can't remember.

52x52 is just over 110% with no rebores either. 7% would be enough. That would be 133 for airs and 160 for bangers. Pretty close to now.

[TZ350]

7% would be enough. That would be 133 for airs and 160 for bangers. Pretty close to now.

We are all in this together, I could go with 133 which would allow all four common 0.5mm (used to be eight at 0.25mm each but times have changed) oversize steps out to 2mm OS for the 125's and 160cc for bangers but I could also look at getting a run of cranks done for a real modest amount say $150 each (thats about what it costs me for a piston) would that help, probably need to do five units at least to make the setup cost worthwhile, would there be any serious takers do you think?

Anyway there are alternatives.