ESE's works engine tuner

[Pursang]

Is that a real problem? Especially with Fibre based reeds.

Operating hours will be low for drones flying to targets in Ukraine!

[F5 Dave]

Ooh. Too soon.

[TZ350]

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Something interesting on the dyno today. 92% unbridged exhaust port.

[TZ350]

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Ok the 92% cylinder is not the one for the scooter but this home made cylinder has been successfully run in competition.



The cylinder uses a small tongue to guide the trapped "L" shaped ring back.



The exhaust port floor forms a dam that starts about midway up the transfers.

[TZ350]

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Transfers have removable covers and the transfer windows are CNC machined so that they are radially and angularity are symmetrical and match each other.

So for those wondering if screw top pistons, trapped "L" shaped rings and exhaust port floor dams are real. Then this is one cylinder where these features have been made to work.

[TZ350]

Attachment 354050 Attachment 354051 Attachment 354052

Today the Laser guy came and started to restore the traction surface of the drum by deep etching it.

Laser etched finish on the dyno drum. Tested it today, it seems to work, great restoration method for old DynoJet dyno drums.

[jbiplane]

I produce engines for amateur aviation, for customers like this https://www.fulcrum-engines.com/

Is that a real problem? Especially with Fibre based reeds.

I had a problen when at -28C original Moto Tassinari V-Force carbon petal in the center were broken and made some further damages.
It happen at 6 hours 40 minutes of permanent work at 6700rpm. It happen first time, but I very offset and dont want it happen again.
I will try make 0.4mm kevlar petals as instead of carbon in this valve.

[Pursang]

I produce engines for amateur aviation, for customers like this https://www.fulcrum-engines.com/

So does this Company!



This looks like a 'business' opportunity!



Slava Ukraini!

[Pursang]

I had a problen when at -28C original Moto Tassinari V-Force carbon petal in the center were broken and made some further damages.
It happen at 6 hours 40 minutes of permanent work at 6700rpm. It happen first time, but I very offset and dont want it happen again.
I will try make 0.4mm kevlar petals as instead of carbon in this valve.

-28C is the air temperature at 4000m., assuming a ground temp of around 0C. (like say.. mean Winter temp in Ukraine)
Specified operating altitude of a Shahed drone is 60 - 4000m.


I really hope I'm just a bit paranoid, but Russia's brutal and criminal assault on Ukraine Must Not be supported.

Slava Ukraini!

[TZ350]

https://www.facebook.com/photo/?fbid=10161171465454322&set=a.41107369321&__cft__[0]=AZXHmmgugPPjH36MU_QhfYvUjFJkaV_rD7IjwFlHO7BE2BSF8 W3WNAy-aByy-ojUy3VBdvoPTz-B6vvXWO8E5uZXbjEX4aGKd5sm_tMKsbjbBIuPSzLb3CvtcPJqX t6aGEWfPzqpSule3_Be9d7BHgeBzhe2zCfwX8N5RjWlGDKC3o6 gzJ30BBxrrHhhSVdZroJn8ZbPmj8gIZ91v5NOBtxS&__tn__=EH-y-R

Lets not point the finger at each other but save it for the politics that shook the jar and got the ants fighting.

[flyonly]

I have a friend who is having problems with a yz250 based kart engine running on methanol. Peak up is at 9250. This is the ignition curve he has.
I think it’s too much and does not drop off.

He had melted pistons. Egt is getting to 620

An I on the right track to help him?


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[Frits Overmars]

I have a friend who is having problems with a yz250 based kart engine running on methanol. Peak up is at 9250. This is the ignition curve he has.
I think it’s too much and does not drop off.k

With 'peak up' you mean maximum power? Then the ignition timing is more than 10° too early there.

[flyonly]

Yes. Peak up is meant to be peak hp. Dumb auto correct


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[wobbly]

The ignition is way too advanced , but that can be corrected by reducing the static setting - such that you get 15* at peak HP rpm.
But besides that issue , any engine that sees over 600* egt on Methanol is WAY too lean and WILL seize immediately.

[SwePatrick]

Depending on compressionratio 15degree might be low try ~17-18degree if having oem compressionratio.
BUT!! richen it up a LOT!
I´ve seen best results with methanol at ~430degree exhaust temp.
And by doing this you probably need to build a new pipe to get the peak at the same rpm.(shorter pipe for methanol engines)