ESE's works engine tuner

[TZ350]

EngMod2T

More adventures with Engmod, I think its a great development tool and well supported, within a week or so of Neels becoming aware of some data input glitches he sent out fixes. Also an update for transferring the calculated combustion values for ignition delay, burn time and turbulence from a performance graph to the combustion data file.

These figures used to have to be calculated by the simulator then transferred by hand from a graph to the combustion file. A bit of a pain as the combustion data has to be re calculated every time there is any change in the physical combustion chamber shape, compression ratio, fuel, squish clearance, squish velocity, all stuff that affects the burn rate.



The simulator is first run in Turbulent Mode using the defult combustion data settings.



Turbulance



Delay in getting the fire underway and burn time.

The burn time (in degrees) decreases with rpm, I guess because of increasing turbulance.

And the shape of the burn curve and delay suggests the shape of the ignition curve I could try.



The new Combustion Data File can be created using this button.



Easy as ..... and now I can play with the ignition Timing and AFR to see what affects changes there might have.

[wobbly]

Here is a first play with the GP125,much easyer to ride fast, and all realistic inputs.

[TZ350]

I like it, try as I might I couldn't get rid of that dip, thanks for the new file and tips ......

[TZ350]

Gigglebutton, this is a racer Cotswold peddled (Raced) in England,

I have seen two of these frames at Keith Robinsons, they looked light and strong.



Giggles do you think you could make copies of them for F4 and F5 engines at an affordable price?

[husaberg]

Gigglebutton, this is a racer Cotswold peddled in England,

I have seen two of these frames at Keith Robinsons, they looked light and strong.



Giggles do you think you could make copies of them for F4 and F5 engines at an affordable price?

Looks like a Waddon they did the Rotax Tandam twin as well. The forrunner to the Aprilia v twin
http://www.waddon.me/2011/01/the-waddon-frame/
Tony Foale was big on that style for a while. The frame designer Nigel Leaper used to work with him in the 70's.THe basic frame was able to accept both Yamaha and rotax 250 engines
Ask Grumph to show some of his replicas ie Machi. Grumph....... I am asking nicely.
Email them and I will post them for you if you want.
Grumph if i am not mistaken also used a novel source of steel light gauge section for the spine in his Machi replicas.

[TZ350]

A Waddon style chassis and light wire wheels like Chambers uses could be the go. The search is on for some detailed drawings and dimensions suitable for a F4 frame.

Here is a link to an interesting frame build, very detailed pictures.
http://forums.sohc4.net/index.php?PH...&topic=44736.0
frame tubes are ST37, dimensions 28x1.5mm, 70x1.5mm, 100x1.5mm. TIG weldet. frame weight 8.5kg, swingarm 3.4kg

It has got to be possible to build Waddon style frames for F4' and 5's ...

[TZ350]

Husaburg sent me a link to a Aermacchi frame build

http://flashbackfab.com/pages/racegallery.html



And here is the engine build

http://flashbackfab.com/pages/builda392.html



Sure some might call it a dirty puff dragon but its interesting engineering never the less ........

[cotswold]

[QUOTE=husaberg;1130221442]Looks like a Waddon

That is a Waddon from 1983.

[husaberg]

Husaburg sent me a link to a Aermacchi frame build

http://flashbackfab.com/pages/racegallery.html



And here is the engine build

http://flashbackfab.com/pages/builda392.html

http://www.eurospares.com/graphics.htm

Sure some might call it a dirty puff dragon but its interesting engineering never the less ........

If you want to see interesting engineering have a look at the excelsior V twin on the same site that will blow your mind someone on the thread may know some people who have contributed to that as well.
http://flashbackfab.com/pages/excel00.html



Grumph sent me some pics of his handy work and yes it is pretty handy.


Also a Tony Foale tz frame and some other random stuff from here
http://www.eurospares.com/graphics.htm

[F5 Dave]

They may be old hat & compromised, but there is just something about Astralites that appeals to me from the first time I picked one up.

[husaberg]

They may be old hat & compromised, but there is just something about Astralites that appeals to me from the first time I picked one up.

Super light and super strong 20 spokes yes count them 20!. The lightest he made in 3 inch wide was 1.8kgs for some works bike.
It was cantilevered and only achieve full strength when the tyre was inflated
The thing with these wheels is if they fail they fail slowly like a spoked wheel rather than snap like a carrot. Ask Robert Dunlop re IOM wheel collapse.
He stopped making them when the material suppler insisted he order tons of the very special material at a time. With no guarantee of the quality. Rationalization they call it.
He still makes very sexy wheels. Tony Dawson.

[Grumph]

This has turned into a good example of KB's tendency to wander off subject...should have been in the race frames thread IMO..
However, something that will resonate with a few Kiwis, Paul Brodie who features in the site linked by Husaberg, lives just outside vancouver. A few years back, returning from an AHRMA meet at Sears Point he had his van and bikes stolen at an overnight stop.
He seems to have dropped Aermacchis totally at that point and built the Excelsior as therapy.

The Waddon style spine frame is relatively easy to build. Supply your frame builder with the forks and suspension you wish to use. Possibly seat and tank also. Easy peasy...
from a frame builders point of view the hard part is getting paid.....

[husaberg]

This has turned into a good example of KB's tendency to wander off subject...should have been in the race frames thread IMO..
However, something that will resonate with a few Kiwis, Paul Brodie who features in the site linked by Husaberg, lives just outside vancouver. A few years back, returning from an AHRMA meet at Sears Point he had his van and bikes stolen at an overnight stop.
He seems to have dropped Aermacchis totally at that point and built the Excelsior as therapy.

The Waddon style spine frame is relatively easy to build. Supply your frame builder with the forks and suspension you wish to use. Possibly seat and tank also. Easy peasy...
from a frame builders point of view the hard part is getting paid.....

Ok I think this is the one Grumph means. http://www.kiwibiker.co.nz/forums/sh...4-Race-chassis
It took a bit to find it but i am a little thick.

[TZ350]

This has turned into a good example of KB's tendency to wander off subject...should have been in the race frames thread IMO....

F4 & F5 is the great frontier of DIY racing.

Virtually nothing is off topic in the ESE Bucket development thread particularly if its technically clever DIY to do with building bikes and engines or performance tuning and theory.

Looking at the frame building stuff has got me pretty interested in a spine type frame.



The big question is ... could they compete for handling and weight with a Honda RS chassis?

[Grumph]

For the racing you're doing, yes a spine frame would be stiff enough and can easily be made light enough too.

BUT - given the number of readily available alloy road frames available and the low prices they're commanding not many people are going to be interested in having one - or a batch - built.

IMO you should be looking at the 50's and 80's frames - the Derbi's and Krausers - as these have more relevance to the performance levels of the motors you're using. A Derbi style spaceframe or even a Krauser/Bultaco monococque is not hard to do.

The RS125 frame is overkill for most bucket work. even here in Canty where buckets are a full - track class, the FXR chassis is more than adequate. Rim widths are getting ridiculous on buckets too...I saw Grant ramage beat most of the buckets at levels the other week on a stock FXR with stock rims and BT39's....