Hustler class ( Vinduro Buckets)

[pete376403]

Thankyou, I have a half head here but rules call for air cooled, unfortunately. Good thing is E85 is not banned.

Something I thought about many years ago when involved in TQ racing. Those rules also state "air cooled" and I was looking at using a Hillman Imp engine so, not allowed, but, where does the heat go after the water has taken it to the radiator? Thats right, the air. Then people start going on about the "intent" and "spirit" of the rules. But these same rules allowed oil cooled GSX motors.
It may be different now seeing as there have been no suitable air cooled motors made for a long time.

Do your class rules allow the use of an oil cooler?

[ken seeber]

Have suggested some time ago to just blow air through the existing cooling passages of a w/c engine. Surely it'd provide better cooling that a regular finned a/c engine. Might have to be a juicy blower, but one would be removing the existing water pump which is a mini hydraulic dyno.
Might be brilliant or might be stupid... or

[Flettner]

You are right, I did consider going down the 'but it is air cooled, ultimately' argument.
The use of E85 means I am at not such a disadvantage anyway and I have a perfectly good head with fins on it, the XS one, suitable for cooling a 400cc.
Oil cooling is not mentioned, it will be when they re write the rules for next season 😁.
Along with no electronic fuel injection, no forced induction, single cylinder only, and of coarse no oil cooling. They need to also change the rules to 'direct air cooling, or maybe primary air cooled? But I didnt say this😏

Ive been promised no rule changes this series, and actually I can still run it in the trail bike class just no points if they do.
At the end of the day its about being a little different and having a bit of fun with it.

[husaberg]

You are right, I did consider going down the 'but it is air cooled, ultimately' argument.
The use of E85 means I am at not such a disadvantage anyway and I have a perfectly good head with fins on it, the XS one, suitable for cooling a 400cc.
Oil cooling is not mentioned, it will be when they re write the rules for next season 😁.
Along with no electronic fuel injection, no forced induction, single cylinder only, and of coarse no oil cooling. They need to also change the rules to 'direct air cooling, or maybe primary air cooled? But I didnt say this😏

Ive been promised no rule changes this series, and actually I can still run it in the trail bike class just no points if they do.
At the end of the day its about being a little different and having a bit of fun with it.

So you are squirting under the pistons with all that oil i take it as well as feeding both crank ends.
Then run a low oil level in the clutch and a pumped system for the gearbox?

[husaberg]

Interesting pics i just seen show a Honda twin made in a bout 71-76 were camshaft drive on the side and 360 crank
Its and interesting set up with one very long crankpin. look horizontally split cases as well
They look like a CB200 style wise but totally different engine set up I had never seen one?

the crank look pommy.
some are twin carb

[Grumph]

I think Blue Wing decided that one was going to be too expensive for NZ. We got the visually similar CB200 but the 125's stayed as singles.
One of Honda's more simple designs IMO. I like it.

[husaberg]

I think Blue Wing decided that one was going to be too expensive for NZ. We got the visually similar CB200 but the 125's stayed as singles.
One of Honda's more simple designs IMO. I like it.

44 x 41 mm
1969 with the CB125K2 with similar chassis, but now with 5 speeds and a speedometer/rev-counter recessed into the headlight. This is probably the best and fastest of it’s genre, the Japan model having an electric start, the general export model did not.

The K2 model also introduced new ‘candy’ colour schemes to the quarter litre class, and like it’s predecessor lasted only one year before replacement with the new upright CB125K3 with a semi fabricated frame, which led the way for all the rest of the k series and B6 model 125’s which were all powered by the same lightweight ultra compact twin cylinder engine. The final CB125 sports twin was the CB125T range first launched in 1977,

looks like all the 125s were side cam right from the cb92 benly? i never knew that
this is the CB92 sloper. the 150 and 175s 200's were all that i can side central cam



To me its unusual for Honda to have such a model that maintained no common parts or design with the other sizes.
Until the cb125T etc
its also has a helical primary which Honda avoided.

[Flettner]

Measuring the cam, see what I actually have got.

[husaberg]

https://www.dropbox.com/s/r0i632nh8g...anual.pdf?dl=0

https://www.dropbox.com/s/9np2w9fgzw...G-by-Mosue.pdf

added the 400 for good measure

[Grumph]

The interesting difference between the two cams is the bigger motor is on slightly wider lobe centers. Small engines cam is 108/106 . 400 is 110/110.
The 400 wide lobe centers are the better choice for a blown engine IMO.

[Flettner]

The interesting difference between the two cams is the bigger motor is on slightly wider lobe centers. Small engines cam is 108/106 . 400 is 110/110.
The 400 wide lobe centers are the better choice for a blown engine IMO.

Agreed, Im looking at just copying these lobes and spacing them apart, say each one five degrees, putting the lobe centres ten degrees apart. Somewhere to start I guess.

[Grumph]

Agreed, Im looking at just copying these lobes and spacing them apart, say each one five degrees, putting the lobe centres ten degrees apart. Somewhere to start I guess.

Think about that. Lobe center figures at the crank are not the same as lobe separation at the cam.

[husaberg]

The Crank that Flet is building is 360.

These are the specs of the CB350


real early
15, 40
40, 15

mid 10, 35
20, 10
late 5, 30
30, 5


Grumps built a 500 supercharged twin

http://victorylibrary.com/tech/super...er-engine5.htm

[Grumph]

The fact it's a 360 crank helps as no big plenum is required. Some volume in the inlet tract is desirable though. Some overlap is also desirable if it's air cooled. The time spent blowing mixture through at overlap will cool the valves and piston which is highly desirable.
In my experience, the books tell you that less cam is needed and any increase should be on the exhaust side. I reckon that's wrong. I ran what was the normal F3 big cams on std valve sizes on the 500 twin. 15lb boost and around 100rwhp on straight Methanol. The roots blower we used (750cc displacement) at engine speed gave a flat discharge curve from just above idle to 11 grand. Boost gauge stayed stuck on 15lb. If I could have found a 4 speed gearbox for that engine I would have put it in. The torque curve was dead flat and changing 6 gears was a pain.

[Flettner]

Cant wait for the casting resin to be imported by the fiberglass shop. So Im using just bondifil, a stack of fins.