ESE's works engine tuner

[Ocean1]

Here is a Masters Thesis on dynamic load analysis, interesting.

Very comprehensive, will have a read.

Respect for using I-deas to model the rod, I found it a bitch for anything mesh related.

[2T Institute]

Looks like a "Vale Onslowe" Cvlinder that was made for the villers bottom ends in the mid 60's. they were a London bike shop that were into karting back then. A few turned up in CHCH in the 60's and were a good thing at the time....

Graham Selwood

Hello Graham aka Mr Crankshaft

[husaberg]

Hello Graham aka Mr Crankshaft

http://crankshaftrebuildingservices.com.au/

[burtpulizzi]

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[FastFred]

The bearings of bodies who accord to altered business professions has become actual analytical of wifi jammer as their authorities bolt them anywhere any moment.

Its OK, you are amongst friends, we hear you brother ....

[TZ350]

No Glory Tonight.



I wanted to use the original carb setup and establish a base line for the Triple Ex port cylinder before swapping to EFI.



I was expecting to have to dial the Triple Ex in but it was a real dog to get going and after fiddling for a while changing jets, the Blue line is the best I could get.

The Triple Ex has the same timings, same carb, same ignition and the same pipe as the 1ex (Red Line) but more blow down. Not sure whats happening here .... I will have to think about it.

[speedpro]

Could be reduced amplitude of the exhaust pulse leading edge affecting scavenging etc. Depending on how those three ports are laid out. Surely you have run it through the sim? Interesting little double peak as well pointing to a mismatch.

[Dutch Fisher]

I dont know if the oscilloscope has a screen "stop" and capture facility.
When I run the TZ400 system on the bench I will see if it can be done - or maybe I could use Gadwin to capture one cycle, not sure!

Look forward to it if you can.


Just what is so iffy about the RS125's combustion that it responds to the twinfire...

... and what do you need to look for in a 'normal' CDI equipped motor that tells you it would/could benefit from twinfire?

[TZ350]

Surely you have run it through the sim? Interesting little double peak as well pointing to a mismatch.

This cylinder has worked well before, my suspicions are:-

(1) that in changing the heads clearance volume when I went from a flat top piston to domed I have got the head shape wrong. New head required.

(2) In retreating from the extreme exhaust timing I had before of 78.5 ATDC I lowered the cylinder 1mm and now the timing may not be the 80 ATDC that I think it is. Will have to re measure and sim it.

(3) The piston when its at TDC may be exposing the lower edge of the exhaust port now, as it was pretty marginal before.

This may not be a bad thing as it gives me the motivation to fit a block in the lower part of the exhaust port floor that is higher than the piston crown at BDC.

There may be no good reason for the exhaust port floor to be level with the piston at BDC other than fashion. And it being higher than the piston crown at BDC may reduce short circuiting (Fritz talked about this), maybe this is my chance to find out.

[F5 Dave]

I was thinking 3 &/or aux ex bleeding due to different piston.

That being said I'd be happy to get that power atm.

[gravmax88]

Hello Graham aka Mr Crankshaft

Gidday Lozza.......I guess those of us with 20:1 flowing in our veins are destined to end up here.....

Have spent 3 days and only at page 500 or so........ phew......

I can still shiver at the thought of the sound a 250cc Yamaha DT2 engine makes in a kart at the end of the main straight at Manfield when using it for the first time with a Wiseco piston fitted!!!!
When you back off and the pilot jet is still too small.........you don't need any electronic det sensors to feel the death rattle then......

Graham

[cotswold]

http://www.youtube.com/watch?feature...v=sQ2biYFE0Lk#!

2t going hard

[TZ350]

I was thinking 3 &/or aux ex bleeding due to different piston

Yes could be aux/ex bleed, I will check that too, thanks for the tip.



Dug out the old head with the 1mm thick copper sprayed coating. It has a familiar combustion chamber shape that has worked OK on other cylinders.

If this cures the power problem, then I will get the combustion chamber nickle or chrome sprayed about 0.0025" and polish it to stop the discoloration of the copper that changed the shiny surface of the copper combustion chamber from a reflector to a heat absorber.

[TZ350]

I have never much felt inclined to have a hero but if I did it might be Smokey Yunick, because I like his thinking.

http://www.circletrack.com/ultimater...k/viewall.html

[TZ350]

modified 1980 Suzuki GP125

Well that did not go so well, spat the head gasket and a bit of a nip up on the right hand side of the exhaust port.



The good news is, the nip up did not jam the ring and the piston did not brake, and it has had a bit of a thrashing and seen 13K a few times.

I was keen to use a head gasket as I liked the way it thermally isolated the head from the barrel and allowed the head to run cooler.

This is the second time I have tried it and both times ended in failure, also the compressibility of the head gasket is ok for an open combustion chamber but made it hard to get the cylinder stack height right for the correct squish clearance.

Maybe time to give it up and go back to the all copper/fin type head gaskets.