ESE's works engine tuner

[peewee]

waiting on some welding supplies but when they arrive i plan to fill in the exh bottom like so. what you think ?

[wobbly]

Great idea, and when you have completed the ports in the cylinder and have the effective STA you can then do the calculation
to reduce the duct exit area, and promote flow down the Aux port ducts.
Then a CNC oval to round transition in the spigot.

[peewee]

ya i was gonna have a look at the rsa manifold and see if i couldnt modify my existing manifold in a similar way. weld some wings on the sides or something

im gonna finish all the welding first then put it in engmod but ill probly do something like this. closing up the waterjacket will be easy but i havent thought yet what sort of bubble shape to use. i guess it dont need to be real complicated, as long as water can still circulate through that area

after looking at the manifold i think what i can do would be rather simple. just build up some little wings on the sides then build up the cylinder just alittle to match.

[karter444]

Yep the lobe is too long - 1/2 its length and all will be fine.
I dont know if the KX trigger is shit, but I have never had any trouble with regular CR125/250 types.
The Ignitech one operates exactly the same as the Kokusan type Honda ones, nothing special at all.
There is an option under special setting called wide lobe, this is probably to suit exactly what you have, but I have never used it.

thanks for the explanation I will modify flywheels and let you know after we have raced next
cheers
I also have a small engine inertia dyno for sale was originally used for doing kart engines unfortunately it has no software etc
can be viewed on trade me #901605486 if anyone is interested call 0274949706

[senso]

Dumb question time...
What is that hole above the exhaust port?

[husaberg]

Dumb question time...
What is that hole above the exhaust port?

I was looking at that too, I just assumed it was a detuning bleed. To take some of the pressure and violence out of the blowdown period. Although it seems a little too high?

[F5 Dave]

Make it easy to kick start. My 300 has one. Perhaps valve operated see front manifold pic.

[wax]

I have a question for Frits or wobbly or anyone who thinks they can answer it.
I have a JetSki cylinder with a single exhaust port and so I can't go very wide. Therefore it's not going to drop the combustion pressure the same and so in my mind I would expect it's blowdown time/area to be lower than say a triple exhaust port system. Would it make sense the to have a larger blow down say 36 degrees instead of 32. I'm concerned about not dropping the pressure enough and stalling the transfers. What's the downside to having two much blowdown, would it be that you then don't have enough transfer time/area and the reduce the power of the engine. Thanks a lot

[husaberg]

Make it easy to kick start. My 300 has one. Perhaps valve operated see front manifold pic.

Oh A compression release? I thought they were well out of fashion. Engine braking an option?

[Muciek]

I have a question for Frits or wobbly or anyone who thinks they can answer it.
I have a JetSki cylinder with a single exhaust port and so I can't go very wide. Therefore it's not going to drop the combustion pressure the same and so in my mind I would expect it's blowdown time/area to be lower than say a triple exhaust port system. Would it make sense the to have a larger blow down say 36 degrees instead of 32. I'm concerned about not dropping the pressure enough and stalling the transfers. What's the downside to having two much blowdown, would it be that you then don't have enough transfer time/area and the reduce the power of the engine. Thanks a lot

What is the ports height? On sleds mostly exh was sth like 195 and transfers 110-115.

[wax]

195/120
Exhaust and transfers respectively

[Frits Overmars]

Frits, did you have the Ryger Technology in your head already some time ago? if so, did you expect it to work in real? if not, why not?

All credit for the Ryger engine should go to Harry Ryger, and Harry alone. I'd post a picture of the engine's spiritual father, but Harry prefers to stay in the background. Finding his photo on the world wide web may prove to be as difficult as finding the Ryger patents .

[peewee]

Make it easy to kick start. My 300 has one. Perhaps valve operated see front manifold pic.

Not valve operated. It does bleed off pressure for easier kicking but in the service manual it also says its for tuning. In the front of the cylinder youll notice a bolt hole in which the bleed hole ca be closed off or left part way open. I may just weld it shut

[F5 Dave]

My GG is just an open hole but small enough that probably doesn't affect power much but at kick over speeds means its no harder than my 200. This is super important to me when tired having stalled half way up some slippery single track.

Saw the bolt hole, what was the brand again? Pumpkin?

[adegnes]

Got engmod, wohoo!!
first of all; a HUGE thank you to Neels for the superb service and great product, and to all of you guys especially wobbly and TZ350 for making me aware of the software and it's capabilities, and sharing all the info!

Everything is working great, no hickups...exept for that I'm experiencing problems when trying to run simulations in turbulent mode (probably user error though...)

heres my combustion data:


heres a simulation running prescribed


and heres what happens(and other variations of wierd output) when I try to run turbulent, no change to the combustion data, just ticked of "turbulent".



What am I doing wrong?