Hustler class ( Vinduro Buckets)

**Flettner** · 15th December 2022, 17:33

Time and money, mmm sounds good.
But until then it's status quo, fuck all money and no time.
But for what its worth Ill publish results, pitty its an air cooled cylinder but such are the Hustler rules.
Next cylinder will be twin exhaust port but water cooled, 175cc, 61 stroke 60 bore. Twin disc valve, a real engine.

Dave, I intend to run a two into one pipe, ld like a single reverse cone, for reasons. When my CNC is up and running again I intend to machine a wee press tool to make the joiner piece, with proper volumes all the way through.

**Flettner** · 23rd December 2022, 19:19

Fins next I guess.

**F5 Dave** · 24th December 2022, 08:13

Looks like some sort of crazed octopus.

**ken seeber** · 24th December 2022, 12:24

Originally Posted by F5 Dave

So here's a thought. If you were to make two chambers because of your port layout, would you expect to run very similar design as conventional engine, but with two critical changes? Stinger diameter reduced to match 1/2 the flow/ power output. And I guess you are starting with a smaller outlet.

You could swap one pipe for a slightly different design if you wanted to offset the power spread. Actually, no. That would likely just alter flow from other port giving worst of both worlds.

Getting close Dave. Have the ability to have 2 different pipes with a valve (Fletto loves making these

) that could switch to either single pipe on its own or both pipes together.

Could lead to a the development of new range of FOS and EngMod2T software with Wobbly fine tuning a new exhaust port % area ratio rule. Bring it on.

**Flettner** · 24th December 2022, 20:37

First fin fitted, others cut but not glued yet.

**Flettner** · 25th December 2022, 20:33

Addressing the reed area.

**Flettner** · 31st December 2022, 06:26

A bit of work around the exhaust ports, a head bolt boss or four, then off to the foundry.

**F5 Dave** · 31st December 2022, 08:49

This is going to be cool and funny at the same time (first meeting).

**Grumph** · 31st December 2022, 12:42

Originally Posted by ken seeber

Getting close Dave. Have the ability to have 2 different pipes with a valve (Fletto loves making these

) that could switch to either single pipe on its own or both pipes together.

Could lead to a the development of new range of FOS and EngMod2T software with Wobbly fine tuning a new exhaust port % area ratio rule. Bring it on.

Just a side note here. There is a known phenomenon seen on 4 valve, 4 stroke singles with separate exhaust ports and pipes. Put on one port a pipe of the correct length for maximum torque and on the other one correct for maximum power and you get better torque and power than from the optimised lengths for either.
Don't know why but I've seen a couple of dyno sessions proving it.

No idea if it would work on 2T's. Probably the most successful twin pipe 2T would have been the twin port CZ motocrosser. And it used identical pipes both sides.
Well, identical until they got dented.