ESE's works engine tuner

[F5 Dave]

Diameters?

[wobbly]

The way you have drawn them both are impossible to build ( with zero wall thickness ) but version 2 with a step opposing reverse waves going up a larger diameter stinger, is what i have found makes best power when used as a short nozzle restrictor placed at the rear cone exit. It also needs more fuel.
How do you know the jetting was optimum to start with, as Methanol will run exactly the same , and making the same power , when up to 20%
rich over a huge range of flow numbers.

[SwePatrick]

Diameters?

Is that even a valid point?
My question is if the rubber forms a little volume(plenum) behind the stinger, it may create odd effects?

[SwePatrick]

The way you have drawn them both are impossible to build ( with zero wall thickness ) but version 2 with a step opposing reverse waves going up a larger diameter stinger, is what i have found makes best power when used as a short nozzle restrictor placed at the rear cone exit. It also needs more fuel.
How do you know the jetting was optimum to start with, as Methanol will run exactly the same , and making the same power , when up to 20%
rich over a huge range of flow numbers.

I shouldn´t comment, but do you think it is zero wall thickness? for real?
Not methanol, E85 this time.
Way more sensitive to jetting than methanol.(i´ve got huge experiance of methanol tuning)

Marked text is valid answer, my answer to that, is that i always build like so, but i was in a hurry and just took a hose i had(to large) and clamped it hard with hoseclamps, and it formed a little 'plenum' behind the restriction before entering the exhaustpipe.
I have dynoed it 86.7whp in my tough roller, (tzr250) with that weird setup, and now when fixed there is a loss.

[wobbly]

I only commented about the drawing having zero wall thickness , because as is usual in a 2T every small detail makes a difference.
As it stands i have no idea which way the steps go in each join - except for the stepped short nozzle version , but even thats not drawn with a bigger main stinger tube. Also one minute we are dealing with Methanol - next its E85 , how can anyone give helpful advice if the basic info is unclear.
Having a small plenum at the entry to the stinger may work like the stepped nozzle , creating same odd restriction to waves that are returning back up the stinger. I will give it a go by expanding a short section of plug in stinger tube and see what happens.

[F5 Dave]

Is that even a valid point?
My question is if the rubber forms a little volume(plenum) behind the stinger, it may create odd effects?

My point was to ask if they were different between drawings, they look different and is that part of the effect? But it wasn't clear. It looks like wall thickness is much more on bottom.

[SwePatrick]

Also one minute we are dealing with Methanol - next its E85 , how can anyone give helpful advice if the basic info is unclear.

I distinctly remember i wrote alcohol fuel..

A question!, version one vs version two(stinger/end of pipe).
I have done this change as version one was from 'taking what i had', now i have optimized it to be like version two, and now it suddenly want a lot more fuel.(from 220 main and 45 pilot to 240 main and 58 pilot, alcohol fuel)

[SwePatrick]

My point was to ask if they were different between drawings, they look different and is that part of the effect? But it wasn't clear. It looks like wall thickness is much more on bottom.

No diameter differences, silly me that guessed people would get that by my non precise drawing.
If i wanted to make a statement of it was different diameters i would have given that info.

The drawing is just a three minute sketch.

[Condyn]

Everyone wants insert nozzles. I prefer doing them out of sheet metal like the rest of the pipe to keep things more simple and less cumbersome.

[jonny quest]

Pump E85 is not 85. It's sometimes 83, 78, 93... you get the idea

[Muhr]

Hey all!

when we are on the subject, (in a way) maybe there is someone who has some smart solutions on jigs for welding exhaust pipes. We did this last night, felt like a smart solution when we discussed it, unfortunately I can now say that it was a pretty bad one ....

[TZ350]

Flettners sliding gib throttle control.



360cc Mk2 TPI , Sliding Gibs throttle, first start up.

[wobbly]

Muhr , all the weld jigs I have seen or used , have the axis vertical with 3 sprung loaded pincer legs fixed to the 3 jaws.
That way by adjusting the 3 jaw diameter any pipe section can be gripped . Having the weld run horizontally past you gives a much better view of the seam approching the arc.

[teriks]

Pump E85 is not 85. It's sometimes 83, 78, 93... you get the idea

Even worse here, where there's "Winter E85" with even less ethanol to ensure cold weather starts.
I have so far never seen anything indicating what quality is sold.

Swedish standard SS155480:2006
• 70 – 86% etanol
• 30 – 14 % bensin
• MTBE, iso-butanol

[Condyn]

Muhr, I saw this on the fakebook a few years back. Always wanted to cut a hole in my bench and run the three jaw manually with a foot wheel with some drag on it. (I gas weld so no tied up foot)