The twingle is getting close

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Same principle could be applied to Norton but no room to fit a shaft beyond the valve end of rocker and no lip on rocker to lift or push on, so not so easy to a skinny fella like me. Norton over looked casting head or cover for such a dohickie too. I hope someone can demo an easy install before me. What would ya be wishing for with all ya might when stopped by tree fall to drag a path in a low spot after a rain in mud on ya boots after terrorized random jerking and skewed skiing that's about worn ya out by then... I know in my case more than once. I'm holding my breath as compression release is make or break feature in a big block Twingle. It'd eat normal robust electric kickers too. I've thought of a small motor to spin up rear tire on center stand then drop the clutch..., rubber bands to twist up around rear tire then let er rip... explosive charges, if ya could get er over TDC in the first place...

My respects to family man stealing time
 
grandpaul said:
comnoz said:
Better have a big bag of popcorn, this weekend is dyno day at the Comstocks for the local Norton club and then another race motor has to be delivered to Kenny and then a couple fuel injection systems have to be delivered and then the rack full of Norton heads to rebuild and barrels to rebore is overflowing and Matt is out of headsteadies again. Someday I will get to finish mine. Jim

Ah, the story of my life.

...now made more difficult with a full-time REAL job and about to adopt our 6-month-old grand-nephew!

Oh boy, I am looking forward to the last teenager flying the nest. Taking on another will either keep you young or wear you out I don't know which.

This semi-retired- do what I want to do hobby is looking more like a REAL job every day. Jim
 
Can ya put some the family to work holding video on the dyno set up and the lift you get kicking off twignle?
 
Why not have an excentric shaft for one exhaust rocker shaft :?: it wouldn't have to be too much to ofset the 0.008" exhaust valve clearance.

Jean
 
hobot said:
Can ya put some the family to work holding video on the dyno set up and the lift you get kicking off twignle?

The dyno has electric start. I will worry about a valve lifter if I like it as a twingle. Jim
 
Jean not so simple to me as the shaft cam must be bigger than the shaft so can't just slide a shaft through. Slot to drop it in imply sealing issues. Just through cover implies cover studs may not be up to the repeated strains. We don't know, or least I don't how what valve lift, especially if can't even kick over one jug, yet want to start with CR open then shut soon as can.

Ok jim, a big old starter on the dyno would work in shop, so I won't hold me breath on your design.
 
pvisseriii said:
How's about a Twingle update.

I would love to but it doesn't look like I am going to get back to it for a little longer. It is setting under a bag in the middle of my bench while I do work all around it. :cry: Jim
 
If it does start and run fairly decent but not happy to live with it I might be interested in the cam and ignition for my own special reasons.
 
hobot said:
If it does start and run fairly decent but not happy to live with it I might be interested in the cam and ignition for my own special reasons.
I'm sure you would there, Dr Frankenstein!
 
Singles, Big bang 4's and dual hit Vtwins are known to hook up the best on loose stuff but tend to run out of power nearing top end, so I've read. There are sand dunes to ski and hill side Gravel cuts to climb when I'm bored with tarmac ease on Peel. I simply hate it when giving more throttle just lowers the shoving ahead sense don't ya know. Peel may be able to over come the breathing issues - don't know of course. Stuff to look forward too if I live long enough.
 
From mc-engine list today to put some fire under Jim once back home from his Dixieland journey this month. Peel may hit 17 CR under boost.


On 10/7/2012 12:34 PM, Danny Whitfield wr
>
> hobot
>
> CR 17:1 worked well (normally aspirated) in H-D XR1000, but Moroso
> octane booster was necessary (supercharger dose). Torque was so much
> that traction was not. So I twingled it (both cyls fire on same up
> stroke) which resulted in a Ninja killer. Went through 11 drive
> chains in one season but found no other weak spots other than myself,
> it pulled so hard that it hurt.
>
> Dan W
 
bot
>
> CR 17:1 worked well (normally aspirated) in H-D XR1000, but Moroso
> octane booster was necessary (supercharger dose). Torque was so much
> that traction was not. So I twingled it (both cyls fire on same up
> stroke) which resulted in a Ninja killer. Went through 11 drive
> chains in one season but found no other weak spots other than myself,
> it pulled so hard that it hurt.
>

Getting both cylinders on a Harley to fire together is quite tricky.
Quite tricky indeed, since with one crankpin both pistons don't get to tdc together.
Perhaps we are talking about a close firing v-twin ... ???

At 17:1 CR, you'd imagine it would be running alcohol, no octane booster necessary. ?
 
The term "twingle" has been used by H-D dirt-track engine builders for decades when they changed the firing order of the v-twins so both cylinders fired 45 degrees apart. They noticed a long time ago that riders had better feel for the edge in turns when the power pulses were more coarse than those supplied by "smoother" engines, like the British twins with the stock 360 degree crank.

Smooth power and lots of pulses per revolution did not seem to bother Kenny Roberts though on the TZ750 miler.

IMHO twingling a high-hp British twin is not a good idea. It is like having two fat chicks(power stroke) crossing a shaky rope bridge(norton crank) with you instead of one....
 
beng said:
Smooth power and lots of pulses per revolution did not seem to bother Kenny Roberts though on the TZ750 miler.

Twingles has also been used to describe some 2 stroke engines that had twin pistons (on a common single cylinder crank)- one for the inlet side of things, and one for the exhaust side. Shared a common combustion chamber, and of course fired together (as if they could do anything else.!). Gave very controllable porting, strong torque, good power and good fuel consumption...

Kenny Roberts is also quoted as saying "they don't pay me enough to ride that thing", and parked it and never rode it again, after that famous win (shadowed the leaders the whole race, and blitzed em on the last lap). The fact they banned them may have had something to do with the latter (about never riding it again.)
 
Brelsford won on Kanemoto`s H2 Kawasaki flat-tracker, they tried a 'tringle' [3 all up] set up on it too, but it had vibration issues & primary gear problems with all power being fed through the same point, instead of 1/3 as designed.
However , it WAS H-D squealing to the AMA to ban multis that stopped them racing, not inate V-twin superiority..
 
Rohan - "Perhaps we are talking about a close firing v-twin ... ???"


Dan - On the same upstroke but 45 degrees apart. Sounded like a single.
Engine has a separate cam gear for each cam, which train one behind
the other. All I had to do was make new timing marks 180 out for the
last 2. The XR has separate carbs so they were OK. I used a
Lightning dual ignition, separate for each cyl. in the same ign. space
except for separate coils.

At 17:1 CR, you'd imagine it would be running alcohol, no octane booster
necessary. ? It's a street bike, no alky available on the road.

Stock H-D starter had no trouble. Cams were factory race, so very
late closing intake helped.

Best, Dan W
 
I first saw an XR750 twingle with Jay Springsteen riding on a cinder
1/2 mile horse track near Palm Beach FL (AMA National Flat track).
The bike produced a thicker roost. he won going away.

Dan W
 
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