ESE's works engine tuner

[Frits Overmars]

oh right, thanks. well no atmospheric pressure i assume would be no air flow? therefore no airflow into the engine would be a negative impact. i would then suppose that if the engines airflow was subjected to/lived in a higher than our average 14.96 psi atmosphere then this would be increased airflow in and a positive impact? like turbo charging, maybe? please put me right, if i am wrong
Frits, if a 2 stroke engine was mechanically run, completely sealed off, with only air trapped inside when sealed up, would there be an increase in air pressure trapped within ?

You're on the right track with 'no atmospheric pressure i assume would be no air flow' but you could say it even shorter: ''no atmospheric pressure would be no air'.
And no air = no combustion = no power at all.
I'm not sure where you're going with your second question. Motoring a sealed engine requires some energy, even if the seals are free of friction, because the air inside is pumped from one corner to another and back. And this energy raises the air temperature, which in turn raises the air pressure inside the engine. But if you stop motoring the engine and allow it to cool down, the internal air temperature and pressure will return to their initial values.

To answer your initial question: increased atmospheric pressure augments engine power, as Lohring described.

[jasonu]

Don't Mention the War!, i think i got away with it last time

hahahahahahahahhaha!!!!!

[WilDun]

The microlight and homebuilt aircraft boys (and Flettner) might be able to give a lot of info on this subject - their engines are subject to constant atmospheric pressure variation!

[oldjohnno]

Worth remembering too that as the air pressure increases so does its density, so the engine is ingesting a greater mass of air and that's probably of much greater importance than the increased pressure differential between bellmouth and crankcase.

[jasonu]

https://www.kiwibiker.co.nz/forums/s...comeback/page2

[jamathi]

I think it comes down to the higher speed at which the smaller "crankcase" volume attains its peak efficiency.
With the conventional style engines reducing the primary comp to anywhere near the same level had required the crankcase airflow and transfer flow to become so hugely stifled it became irrelevant, I believe it was because it created huge boundary friction in the areas around the crank wheels. plus other flow airflow restrictions.Thus I muse separating the crankcase might be the difference.
Also it would seem the ryger benefits from modern transfer control and durations. As devloped over the last 40 years.



or it might just be overhyped horse poo.

Maybe it is...

Ryger finally bought a dyno....
Those 70HP were just calculated as I always thought.
The new dyno is very 'unfriendly', as it indicates far less HP than expected.
A really big disappointment after some years of work, but we must have patience!
How many years I don't know......
The 50cc version gives 14HP I heard
So the world record attempt will have to be postponed a little bit!
As about 30HP would be needed...


All time and money spent in this project looks wasted to me, I am sorry to say!
How so many people were fooled, I still don't understand.......

[wobbly]

Here is a jetting chart for a KZ2 engine, showing Density Altitude and RAD Vs Jet size in a 30mm Dellorto carb.
One point on the graph was best power on the dyno with egt at 660*C - so the other 2 points used to plot the line were really widely varying density days
but with the tuning done to achieve that 660 result.
All this is doing is replicating the bsfc number at best power, with widely varying air conditions - be they affected by temp, baro pressure or humidity %.

[peewee]

Worth remembering too that as the air pressure increases so does its density, so the engine is ingesting a greater mass of air and that's probably of much greater importance than the increased pressure differential between bellmouth and crankcase.

i dont know much about this stuff but at high atm pressure there would be more oxygen i believe. some you guys live near the ocean. im near 7000'

[ken seeber]

i dont know much about this stuff but at high atm pressure there would be more oxygen i believe. some you guys live near the ocean. im near 7000'

Peewee,
At 7000 ft, the density would be around 1.0 compared to 1.225 kg/met^3 at sea level.
If you come down from that stratosphere, you might get 20% more power.

[jasonu]

[QUOTE=jamathi;1131033456


The 50cc version gives 14HP I heard
...[/QUOTE]

But we were getting 11 and 12hp (Dynojet 100) out of crappy old Suzuki RG50's 20 years ago.

[TZ350]

... a mate just bought that TF in the NSR frame from Auckers ...

Great looking bike, all the basic stuff, should make a great Bucket when you have finished fettling it for him.

[speedpro]

A really big disappointment after some years of work, but we must have patience!
How many years I don't know......
The 50cc version gives 14HP I heard, I still don't understand.......

Darren Gosper's Pete Sales tuned RG50 was making 14hp a long time ago, and was a tractor to boot, unlike his flatmate's 50

[jasonu]

Darren Gosper's Pete Sales tuned RG50 was making 14hp a long time ago, and was a tractor to boot, unlike his flatmate's 50

Me and Gossamer did a Mt. Welli 2hr on that bike. What a sweetie, able to out drag a lot of the 100 2t's and 125 diesels up the main straight.

[husaberg]

Maybe it is...

Ryger finally bought a dyno....
Those 70HP were just calculated as I always thought.
The new dyno is very 'unfriendly', as it indicates far less HP than expected.
A really big disappointment after some years of work, but we must have patience!
How many years I don't know......
The 50cc version gives 14HP I heard
So the world record attempt will have to be postponed a little bit!
As about 30HP would be needed...


All time and money spent in this project looks wasted to me, I am sorry to say!
How so many people were fooled, I still don't understand.......

14HP well that should be competive with 1965 Kreidlers.........
They will have to watch out for the Honda 1966 RC116 though that had 2 more HP

[jasonu]

14HP well that should be competive with 1965 Kreidlers.........
They will have to watch out for the Honda 1966 RC116 and several shitter RG50's too.

Fixed for accuracy.