ESE's works engine tuner

[TZ350]

maybe its true, that pigs can fly ......

[Buckets4Me]

Im sure this is way over 400hp/litre

Not sure of the STAs though

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I might try some nytomethane in the bike and see how it goes as well

[speedpro]

Baby bees are cool. Good little hovercraft engines with the spring recoil starter.

[TZ350]

EngMod2T

Grumph sent me some ideas about fitting a resonator after the carb, with his permision I have posted them.

"If I was you I'd try a proper heimoltz resonator....About 2 X cylinder volume and with a 24mm inlet.

with the big open end you're not getting the best from it.

the original use for them was F3 car motors - 1300cc if I have it right - but they were restricted to a 30mm ID inlet - the FIA wanted a 30mm carb obviously. What the builders did was short inlets into a log manifold - the resonator - with a 30mm inlet trumpet stuck on one end. With port injection they got better power than individual runner injection.

NASCAR V8's have used this setup with the restrictor carbs - one resonator per bank. Grumph"

bend made from a SU carb air cleaner manifold.

flow guide inside the SU bend.

I was happy because it might mean I can recycle this piece by adding some volume to it and get the carb moved up out of the way.

1ex port.

After a bit of work modeling the resonator I got to the red line then by adding a 160mm piece in front of the carb I got to the blue line. So it appears that if you can get the two different resonant systems working together they pass more air.

3ex port.

And with the tripple port using both systems together they did away with the need to vary the length of the first resonant chamber like I had to in my original model.

the before and after carb elements in the inlet system.

If you have to have a manifold and some sort of inlet duct between the engine and carb why not look into using them as tuning elements.

Now I don't for a moment think that I have got it sussed but it is food for thought and a bit of a plan to work on over the next few weeks.

[dinamik2t]

Great ideas!
I love your hunger for simulating alternative mods in EngMod, TZ! I will experiment on my inlet too when I return home.
Have you been monitoring the inlet pressure waves during the testing??

[TZ350]

Travel adventures ... have you enjoyed your time away.

Great ideas! ... Have you been monitoring the inlet pressure waves during the testing??

No ... simulations take about 5-10 min, I do small chores around the house. But that is a good idea, I could learn a lot from it.

[Kickaha]

Anyone like playing around in boats? http://www.boatracingfacts.com/forum...ead.php?t=5509

[TZ350]

That is pretty amazing ....

[dmcca]

Really enjoying your engmod2t work TZ...

Engmod2T question...
So far I've only modelled from the carb into the engine on my bike and haven't tried to model the odd shaped rubber intake boot, air filter or air box (CR250, all typical dirt bike stuff) that are positioned before the carb...

After reading TZ's posts plus other things on the net I want to try modelling them to see the exact effects... Any suggestions on the best way to model these given the strange shapes? Might go into the shed and start measuring to see what I come up with...

[TZ350]

Modelling the intake side, I think this is an important area, and I don't know much about it or how to use Engmod2T properly to do it, I am just learning myself.

Asking Wobbly or Frits or even the Neels himself would be good. I think there is a lot to be gained here, (or lost).

Grumphs idea of a resonator behined the carb and mine of having one in front working in concert with it to shift bulk air through a restrictive 24mm carb could be a fruitfull area of development.

[TZ350]

CRECY ..... sleeve valve 2-Stroke, one of the most powerfull internal combustion engines ever made.

A quick Google (and display "Images") brings up some interesting info.

[bucketracer]

EngMod2T

And with the tripple port using both systems together they did away with the need to vary the length of the first resonant chamber like I had to in my original model.

the before and after carb elements in the inlet system.

If you have to have a manifold and some sort of inlet duct between the engine and carb why not look into using them as tuning elements.

I was looking at your model, I assume the thin bit in the middle is the carb. 75mm for the front end seemed rather large until I worked out that 12,000 rpm is 200 Hz base speaker territory, so low frequency = big volumes.

Ever thought about using a base speaker as an exciter, it could be powered from a winding on the stator that way it would be timed to the crank.

[Frits Overmars]

CRECY ..... sleeve valve 2-Stroke, one of the most powerfull internal combustion engines ever made.

Really? How many ponies are in there? 3000? This will teach you to be more careful with your remarks, TeeZee

[wobbly]

It has always amazed me that people spend a fortune buying - building,a high performance race engines like the Konig above.
Then they use a hacksaw cut exhaust U bend for the header, and birdshit Mig weld it together - then more amazing, put the pieces of shit on the web for us to oggle at.
Makes you wonder at the workmanship and thus the integrity of the rest of the project.
Biased yes, of course - but an autistic blind 5 year old could weld better than some of the things I have seen proudly demonstrated by some 2 stroke ingineers on the interwebby thing.

[husaberg]

Really? How many ponies are in there? 3000? This will teach you to be more careful with your remarks, TeeZee

just saw the pic of the marine engine frits posted...here's a response from Grumph attached below.

Then Wobs bit.Which was clearly obliviously aimed straight at my woeful welding and horrible fabrication.

Biased yes, of course - but an autistic blind 5 year old could weld better than some

I object to that.
Some of those blind autistic welders are Damn good. My own welding is more artistic than Autistic
The birdshit is purely for additional texture.I want my work to be a tactile experience.