ESE's works engine tuner

[Frits Overmars]

Attachment 357474
at first glance. Uncovering the exhaust ports at TDC does not look like it is the issue. But a more careful look may be warranted as the cylinder could be slightly rotated and that may expose an edge of an exhaust boost port.

I can't say for sure that your problems are caused by transfer short-circuiting, but it seems certain that you do have short-circuiting, unless you have used piston plugs.

[husaberg]

It would be pretty easy to say super glue some cork plugs as a trial to see if that is the major issue it only needs to last a few minutes soak the ends in an epoxy or similar, if they break off little harm done.

[F5 Dave]

Re Neels
I know nothing about website access issues but can he create a new account with a different email perhaps?

[husaberg]

Re Neels
I know nothing about website access issues but can he create a new account with a different email perhaps?

Use a proxy with a NZ location?

[wobbly]

I will suggest that to Neels.

TeeZee, if you find you do have Aux/A port linking, the way this was solved in the kart engines to enable running no plugs, was a full triangle shape on the Aux, such that only the very small top corner
radius of the Aux was in play, for only a very short time.
The top edge of the Aux can be much longer, utilizing the high Blowdown Pressure Ratio at APO
The other thing I see is the off the wall Aux shape dead in front of the A port - absolutely incurring short circuiting around BDC when the port depression is greatest .
I have used Hi Temp Ceramic paste in the Exhaust duct when testing the exit reduction idea, it never failed on the dyno - JB Weld make one.

[wobbly]

Neels very grumpy reply - " I cannot access the kiwibiker at all, not even as non-user. "

[TZ350]

The other thing I see is the off the wall Aux shape dead in front of the A port - absolutely incurring short circuiting around BDC when the port depression is greatest .
I have used Hi Temp Ceramic paste in the Exhaust duct when testing the exit reduction idea, it never failed on the dyno - JB Weld make one.

The exhaust duct tunnel was dug at the bottom of the axillary port because that brought it out between the cylinder fins. I will have to think about how I can change this.