ESE's works engine tuner

[Ocean1]

hey guys im making a alloy fuel tank and I want it to be about 5 to 5.5 liters or so. I been trying to find some kind of online calculator that can easily do the math so I can get it in the 5 to 5.5 range the first time but I haven't much luck. do you guys know of any fancy online gadgets that will figure liquid volume of odd shapes ? heres whats its going to look like. the numbers are just generic so you get the idea that its not symmetric from front to back

123333333 (+/- 0.1) cubic millimeters

[husaberg]

hey guys im making a alloy fuel tank and I want it to be about 5 to 5.5 liters or so. I been trying to find some kind of online calculator that can easily do the math so I can get it in the 5 to 5.5 range the first time but I haven't much luck. do you guys know of any fancy online gadgets that will figure liquid volume of odd shapes ? heres whats its going to look like. the numbers are just generic so you get the idea that its not symmetric from front to back

Make a dummy out of Polystyrene and work out its displacement Archimedes style.
Or just measure the area you can of it as a square or rectangle and then average out the additional area into a square or a rectangle.
When I just to measure odd shaped paddocks I just used to break them into shapes I could easily measure. (Pre GIS)

[Frits Overmars]

123333333 (+/- 0.1) cubic millimeters

Your forum name gives it away Ocean1: you think big when it comes to fluids. But somehow I doubt if Peewees tank will hold 123 liters. I'd say 122,5 at the most.
What are you going to use that tank for, Peewee? A motor home ?

[tjbw]

Your forumname gives it away Ocean1: you think big when it comes to fluids. But somehow I doubt if Peewees tank will hold 123 liters.

Oh dear, I must be wrong too

My 10 second, very approximate calc was 129l, assuming original units are cm.

[Frits Overmars]

Link is to a (lengthy) thesis about the subject, including a chapter on balancing and comparing it to a normal slider crank.
http://www.google.be/url?sa=t&source=web&rct=j&url=http://repository.asu.edu/attachments/93289/content//tmp/package-F7iY4z/Conner_asu_0010N_11270.pdf&ved=0ahUKEwid58LbqsLKAhXDORoKHZsUCn8QFggaMAA&usg=AFQjCNE8QNY_HT-rmP1wckRsdSEwUqWByg&sig2=5-c2S0jDx6T1CtffWIA6LQ

Downloading this thesis may take hours (you can finally take that bath) but if you really want to know about hypocycloid engines, it is worth the wait!

[AndreasL]

127.5 liters if the "back" is vertical and all lengths are perpendicular to this surface.
According to Catia that is...and after correcting the units from the "default" mm to cm.

And there I found my mistake and crawl back under my rock...
123.3l is a nice number.

Cant run Catia on my iPhone so if a 3D model is of any use you can send a PM.

[2005bully]

Downloading this thesis may take hours (you can finally take that bath) but if you really want to know about hypocycloid engines, it is worth the wait!

Frits... Very interesting read. The concept fits so well with the Ryger design. Unfortunately after quite a bit of research, It appears no one yet has found a simple solution to all of the mechanical considerations.
Hopefully Flettner is finding a break through. Kermit Buller

[speedpro]

This is how it works with Flettner
First - build a 100cc version of whatever marvel you are interested in
2 - build a bigger(500CC ish) version to power a gyro copter
3 - his wife finds out about #2
4 - he goes to work on the next marvel of thinking and mechanical genius.

[wobbly]

Speed, you forgot line 3A about Flettner.
3A - Posts engine photos scarring the world with glimpses of his pornographic knees.

[Flettner]

This is how it works with Flettner
First - build a 100cc version of whatever marvel you are interested in
2 - build a bigger(500CC ish) version to power a gyro copter
3 - his wife finds out about #2
4 - he goes to work on the next marvel of thinking and mechanical genius.

Ha Ha, yes the wife is not too keen on my home made gyro engine. But what? rely on a Rotax? I don't think so!

[RAW]

Interesting

[TerraRoot]

Very interesting!

wonder what the prototype bottom end was?

[DoldGuy]

And re the squish question - the answer lies in the MSV.
If you keep the volume the same, and the squish height the same, then the width that gets the MSV closest to 38M/Sec is the best compromise between
turbulence generation, and the loss of the fuel trapped in the end gas volume that doesnt burn.
But - as the MSV rises,and chamber turbulence goes up increasing flame speed with it, you will need to adjust the ignition timing to optimize for that.

Lurker here making his first post, have greatly enjoyed the vast knowledge all have shared.

Wobbly, I had to question the MSV value of 38M/sec, my old TSR software states values to be between 15-30 depending on application (stump puller or RPM rever). Is this high MSV the normal target range for a high BMEP build & pull timing out to keep the heat in the pipe? I never have had a head cut with that design & curious if I'm that far off. Also, like that KTM road racer bunches, does the Dyno agree with the simulation?

[mr bucketracer]

Interesting

looks like someone has bet ryger to it

[wobbly]

The TSR numbers are based on very old ignition system input.
That 38 M/Sec number is based on a huge data base of engines that use digital ECU, where we normally see
say 28* of timing under the pipe, 15* at peak power, then enough retard as is necessary to obtain the rev on.
How the squish is set for max efficiency is the clearance is set to the minimum possible to just prevent contact at peak rpm
then the width is determined by the MSV number.
In a race 125 going to 14500, we get 0.75mm gap with 48% squish area.