ESE's works engine tuner

[adegnes]

You can make those coins-on-a-stick like Jan had, but for radius checking it could be even more useful to have a set of balls-on-a-stick.
If I need to measure a radius in a port corner, I usually check with a drill shaft. After all I've got those lined up with 0,1 mm diameter increments.

Clever! Good thing I've just ruined a bunch of drill bits on hardened stuff!

[Reedyspeedy]

Hello all,

This might be a far fetched question, but does anyone know or know of anyone, who has/can alter dynojet software to increase the resolution of the analog inputs? Or is there a third party software/hardware that can run in-line with dynojet software to able to data log and have the logs plotted along with the software plots?

Hope that makes sense.

Thank you

[JanBros]

Would love to know the story behind that wooden piston in there!

a friend of mine once made a wooden piston for a moped. the challenge was that it needed to run 100m. didn't make it that far, but he managed +/- 65m.
his was very basic though, even the "ring" was made on the lath, part of the same piece of wood.

[adegnes]

a friend of mine once made a wooden piston for a moped. the challenge was that it needed to run 100m. didn't make it that far, but he managed +/- 65m.
his was very basic though, even the "ring" was made on the lath, part of the same piece of wood.

[Drew]

Attachment 325383

Team ESE has taken on a cylinder porting apprentice.

Is that Sharn? Met her at the Cliffhanger hill climb in March. Has she gone bucket racing?

[TZ350]

Yes. She has had her Bucket bike in the workshop fettling it for the 2-Hour.

[Grumph]

a friend of mine once made a wooden piston for a moped. the challenge was that it needed to run 100m. didn't make it that far, but he managed +/- 65m.
his was very basic though, even the "ring" was made on the lath, part of the same piece of wood.

The late Norm Hayes of Invercargill NZ made an all wooden engine - which ran.
He was one of Burt Munro's main supporters and a pretty good engineer in his own right. It was done for a bet - with another Invercargill engineer, Oyster who posts on here occasionally. That side of the bet was to produce an engine with everything visible except the combustion chamber. I've seen that one running and Norm's wooden engine was on display at the Hayes family hardware store last time I was down there. Clever guys.

[wobbly]

I have used the Wossner piston with a single ring pinned at 6 from a CR250 in flat top, and the same for a KTM 250
with a dome - both off the shelf,Wossner part numbers.
All the 250 MX engines are 66.4 with 18mm pins, varying deck heights - so plenty to choose from.

[peewee]

all the late model ktm 250 pistons have the peg at 6oclock, how many years this design goes back I don't know. I would assume the cr250 from '02-'07 likely has the 6oclock peg also, before '02 is likely 5 and 7 position. the other japs mostly used cylinder reed valves so I would guess they were 5 and 7 also but im not sure. should be able to google search piston images and get a idea or check photos on ebay

I never made a tool for measuring angles after the fact but I did make some templates for cutting in new aux exh passages and it worked very well. basically I took some measurements in the cylinder of the existing exh passages then drew the new desired exh ducting I wanted on stiff paper and cut it out. then i just grinded the passage floor until the template fit nice. the template was for the aux floor because once you establish that, the walls and roof can be grinded much faster. saved me a lot of guess work and time. unfortunately I must have erased the actual photos of the exh templates I had but heres more or less how I did it. also I made some inner and outer trans wall templates that saved me a ton of time. without templates as a guide it would of been near impossible for me to do the work I did

[jasonu]

I have used the Wossner piston with a single ring pinned at 6 from a CR250 in flat top, and the same for a KTM 250
with a dome - both off the shelf,Wossner part numbers.
All the 250 MX engines are 66.4 with 18mm pins, varying deck heights - so plenty to choose from.

What sort of wood is it made of?

[husaberg]

What sort of wood is it made of?

[peewee]

Attachment 325383

Team ESE has taken on a cylinder porting apprentice.

no safety glasses. no respirator.

[F5 Dave]

I've seen some of Jason's allymininium welding and it was pretty good.

[Ocean1]

You can make those coins-on-a-stick like Jan had, but for radius checking it could be even more useful to have a set of balls-on-a-stick.
If I need to measure a radius in a port corner, I usually check with a drill shaft. After all I've got those lined up with 0,1 mm diameter increments.

I've even seen tiny french curve sections on a stick.

But these are better: https://www.youtube.com/watch?v=rxFJfbdCT_k

And becoming almost reasonably priced...

[Ocean1]

The late Norm Hayes of Invercargill NZ made an all wooden engine - which ran.
He was one of Burt Munro's main supporters and a pretty good engineer in his own right. It was done for a bet - with another Invercargill engineer, Oyster who posts on here occasionally. That side of the bet was to produce an engine with everything visible except the combustion chamber. I've seen that one running and Norm's wooden engine was on display at the Hayes family hardware store last time I was down there. Clever guys.

This one?

It's still there. Still works.