ESE's works engine tuner

[jasonu]

Because I've seen Honda metal turn to bubbles when I've tried that before. Casting metal is a pig but more so 70/80s Honda metal.

A GOOD welder who knows what he is doing should be able to handle it OK.

[Forgi]

I would be very interested in the roof angle of the 6th transfer port thats under exhaust.

This is where I have got to tonight, cylinder prepped and ready to go.

The floor of the exhaust port is higher than BDC. I have no idea how high the exhaust port floor could be and I would dearly love to know more about it and what sort of angle a 6th transfer port there should be.

The alloy stuffer plate and Belzona glue.

All assembled, and compression tested OK so ready for a run up on the dyno, hopefully tomorrow night.

I want to get a good base run with the carb setup then switch to fuel injection. I have no idea how long the stuffer plate and Belzona will last, I guess we will find out soon enough.

Hello Teezee!

How about the running on dyno? I'd be interested what are the results?

And hi everybody!

Is there anyone especially Frits or Wob who has Engmod file pack about GP Van Veen (15-20 Ps) from the 70's-80's? Regretfully in Hungary there is no such old GP 50cc cylinders. I'd be gratefull for that pack as on the net there are a lots of pics and explanations, but they are not so usefull.

Thanks in advance!

[wobbly]

We , anyone,can only construct an EngMod sim by having the complete engine sitting on the bench.
I seriously doubt anyone that has access to a stripped Van Veen, would also have the software to model it correctly.

[Neal]

[QUOTE=I read the other day that Herman Meiers Ariel 250 that i posted ages ago used lab crank seals supposedly they were worth a couple of HP on a 20 ish hp bike then he borrowed the idea from DKW. i will see if i can find the pic.[/QUOTE]


I remember a story from an old racer/tuner I know , he was testing with Herman Meiers before the TT . Every session Herman would walk to the end of the pits and watch the opposition on their bike as 1 other team were testing at the track . He would be playing his harmonica , when my friend walked over to ask him what he was doing , he explained that he had tuned his harmonica to peak revs and he could work out if the opposition were hitting peak revs down the straight when he played the same tune as them .

[TZ350]

The floor of the exhaust port is higher than BDC. I have no idea how high the exhaust port floor could be.

Attachment 284575Attachment 284576

The alloy stuffer plate and Belzona glue.

Hello Teezee!

How about the running on dyno? I'd be interested what are the results?

The glued and screwed in port floor dam held up OK and the dyno results were better.



Raised port floor Blue line.



But I wouldn't read to much into it as this triple exhaust port cylinder made much better power before I "improved" it.



All I did was tidy up around the inside of the main exhaust port area where the side ports converge and after I had finished that I found that some of the horses had bolted.

What was a stable of 29 became less than 20 ??????? ...

Originally the the exhaust timing was 203 degrees duration, lowering the cylinder to 200 exposed the bottom of the exhaust port, the floor dam fixed that.

I was also going to try a power valve like piece in the top of the port but in the end a glued solution was not going to be satisfactory in the long run.

Messing with this has held me up so I have switched to working on fuel injecting a known good single exhaust port cylinder. I will try making another triple exhaust later.

[TZ350]

I remember a story from an old racer/tuner I know , he was testing with Herman Meiers before the TT . Every session Herman would walk to the end of the pits and watch the opposition on their bike as 1 other team were testing at the track . He would be playing his harmonica , when my friend walked over to ask him what he was doing , he explained that he had tuned his harmonica to peak revs and he could work out if the opposition were hitting peak revs down the straight when he played the same tune as them .

Thats very clever.



12,000 rpm 2-Stroke Single is 200 Hz (12,000rpm/60sec=200Hz), I guess the sound of a Twin firing twice a revolution would be 400 Hz.

Someones water cooled Ariel Arrow Racer.

[F5 Dave]

A GOOD welder who knows what he is doing should be able to handle it OK.

Seriously it's pin hole that you couldn't get a pin in

[Yow Ling]

Seriously it's pin hole that you couldn't get a pin in

A folicle maybe?

[twotempi]

TZ350 - According to your musical instrument frequency chart Mr Herman Meir could have been better using a piano rather than a mouth organ , but it probably would have been a bit too obvious !!

[F5 Dave]

I think you could have passed it off as eccentrically mad

[wobbly]

The Arrow race engine I did with pipes for a guy here in Tauranga, had pin hole casting inclusions all over the place.
I ground the holes out and re welded each one in turn, the re machined the squish area 3 times I think before it cleaned up and didnt leak.
It had a horrible tall coned chamber originally with the plug some 30mm away from the piston.
I turned it into a " normal " hemispherical shape to run Methanol at 17:1.
A hateful job I wouldn't do again.

[twotempi]

The Arrow race engine I did with pipes for a guy here in Tauranga

For Mr John Hudson ?? Unfortunately they used to tune it to a stand-still on race day. Should have gone very well - had all the special bits - but it never really did.

[RomeuPT]

The glued and screwed in port floor dam held up OK and the dyno results were better.



Raised port floor Blue line.



But I wouldn't read to much into it as this triple exhaust port cylinder made much better power before I "improved" it.



All I did was tidy up around the inside of the main exhaust port area where the side ports converge and after I had finished that I found that some of the horses had bolted.

What was a stable of 29 became less than 20 ??????? ...

Originally the the exhaust timing was 203 degrees duration, lowering the cylinder to 200 exposed the bottom of the exhaust port, the floor dam fixed that.

I was also going to try a power valve like piece in the top of the port but in the end a glued solution was not going to be satisfactory in the long run.

Messing with this has held me up so I have switched to working on fuel injecting a known good single exhaust port cylinder. I will try making another triple exhaust later.

I don't know if I understand. You had 24,8 hp and the raised floor get you in 29,5? That's huge!

[wobbly]

Yea, everything that went wrong with Hudsons bike was an obvious mistake but he always thought more was better, and spent so much wasted time
flying off on wierd arse tangents before getting even a basic runner under control.
A shame as you say, the initial settup was just fine.

[TZ350]

I don't know if I understand. You had 24,8 hp and the raised floor get you in 29,5? That's huge!

When I first tried the Triple Exhaust I got 29.5 rwhp (I had previously done better with a single port at 31 rwhp)

Tried to improve the Triple Exhaust and it fell to 18.6

Raised the exhaust port floor and went from 18.6 to 24.8

Thrown the cylinder in the bin and started again.