ESE's works engine tuner

[philou]

Engine €2 or €3 ?

[sniemisto]

€3


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[peewee]

Fronius

for me it is one of the best brands

so far i have three fronius machines for all welding types and theyre great. i even sold my miller

[philou]

so far i have three fronius machines for all welding types

I hate you

[wobbly]

Having the cold water feeding in under the Exhaust duct is just as wrong as having all the cold water going into the head.
This change was made 2 homologations ago in KZ engines , where the simple but vey inelegant solution was to feed the cold water surrounding the crank , up thru a hose , and into the cylinder
above the top of the Exhaust duct from one side.
The best scenario is to have all the cold water enter the cylinder over the boost port , then run around the bore over the tops of all the transfers - cooling these first.
Then a portion of the return should be directed to a pair of small exit holes on each side under the Exhaust , the remining flow then exits up into the Exhaust side of the head , around the insert and back to the radiator.
This alone is an instant 1 to 1.5 Hp in 50.

Water flow and cooling in general is a very much ignored source of " free " power gains.
Having water flowing around the entire length of the Exhaust duct , where the plugging charge is retained , is super simple , but never done properly as far as I have seen.
These slots in the Exhaust exit surface ( done by hand many years ago in the pit with a battery drill and file ) cools the back of the spigot as well , and reduces the background deto level by around 20% - allowing alot leaner egt level at full power as a result.
This is much easier now with a small 75% exit area and a 6 axis CNC .

[Vannik]

Having the cold water feeding in under the Exhaust duct is just as wrong as having all the cold water going into the head.
This change was made 2 homologations ago in KZ engines , where the simple but vey inelegant solution was to feed the cold water surrounding the crank , up thru a hose , and into the cylinder
above the top of the Exhaust duct from one side.
The best scenario is to have all the cold water enter the cylinder over the boost port , then run around the bore over the tops of all the transfers - cooling these first.
Then a portion of the return should be directed to a pair of small exit holes on each side under the Exhaust , the remining flow then exits up into the Exhaust side of the head , around the insert and back to the radiator.
This alone is an instant 1 to 1.5 Hp in 50.

Water flow and cooling in general is a very much ignored source of " free " power gains.
Having water flowing around the entire length of the Exhaust duct , where the plugging charge is retained , is super simple , but never done properly as far as I have seen.
These slots in the Exhaust exit surface ( done by hand many years ago in the pit with a battery drill and file ) cools the back of the spigot as well , and reduces the background deto level by around 20% - allowing alot leaner egt level at full power as a result.
This is much easier now with a small 75% exit area and a 6 axis CNC .

Wob, if you include the crankcase flow, how would you do it?

[Muhr]

The best scenario is to have all the cold water enter the cylinder over the boost port , then run around the bore over the tops of all the transfers - cooling these first.
Then a portion of the return should be directed to a pair of small exit holes on each side under the Exhaust , the remining flow then exits up into the Exhaust side of the head , around the insert and back to the radiator.
This alone is an instant 1 to 1.5 Hp in 50.

Do not know if I really understand. Is there something like this you are thinking of?

[TZ350]

Dyno time ...... vrooom vrooom WOT maxed out in 6th ... back wheel stopped turning around. So much for my last new cylinder .......

Geez, what kind of piston do you run. I never, like never seized an RG on std or KX piston.

Took the cylinder off. It seems that I let the Kneed-It filler in the inlet get to close to the piston.

The piston rubbing on the epoxy must have melted it and the epoxy mess ripped things up. I guess the epoxy did not have good lubricating property's.



Next time I wont try and bring the filler in the inlet port up flush with the cylinder. Cylinder looks salvageable, but not sure about the piston.

[wobbly]

Sorry I didnt word my fist description correctly.
If the water is fed initially into the crankcase ( from the front in the Aprilia or the middle as in the TM ) then the main flow from there should be directly up into the cylinder
with a pair of large holes each side of the boost port ( NOT underneath the hot Exhaust duct ) . Another pair of smaller holes should also feed up under the Exhaust port , thus aiding flow around this area separately.
The only exit flow from the cylinder is up into the head directly over the Exhaust port. Thus keeping the water heated up by the Exhaust duct flowing away from the transfers.

This is possible for example in the TM , if the water in the cavity between the case and the gearbox is then also fed forward over the top of the mains ( thus cooling the transfer entry area ) and up
into the cylinder each side of the boost port.

This idea has been applied to old designs , like TZ250/350/750 , where the original flow was completely wrong - but this needs some form of separation plate or gasket between the head and cylinder.
Again , in this case all the flow enters the cylinder thru a new spigot welded in opposite the Exhausts , and all the cold water flows forward across the transfer tops , then exits into the head thru a pair of holes
each side above the Exhausts.

The test was done on a TM by extending the existing water feed hole around to above the boost port. A real 1 Hp free lunch , but not shown in the homologation papers , so probably illegal.
Thus I did the almost as good change , and forced all the cold water away from the Exhaust duct with a hidden manifold inside the cylinder - legal.

[Condyn]

Does anyone have a developed engmod pack file for a modern-ish Yamaha yz250 that I could get my hands on?

[Muhr]

Sorry I didnt word my fist description correctly.

Ok understand! 👍

[wobbly]

Condyn , I have a stock YZ250 pack from years ago - PM me with your email.

[DoldGuy]

Condyn , I have a stock YZ250 pack from years ago - PM me with your email.

Wobbly,

I’d appreciate a copy also...PM sent.

Thanks in advance.

[Flettner]

These two cylinders freshly cast, destained for the 700cc track bike.

[ceci]

These two cylinders freshly cast, destained for the 700cc track bike.

I feel disappointed, I thought that in this new engine I would try some new solutions that can increase power.
It is very frustrating for those who do not have the means and cannot do anything, to see how those who can do it do not do it.
There are already many 700cc two-cylinder motorcycles "with KTM cylinder and others", there are even those with CR500 cylinder, but none of them have anything new. And less when it comes to power increase.
I hope you understand me and don't be offended