Final KR Based Race Bike Project

[KR-1R]

[JanBros]

why did you go for flat tops ?

[Luders]

Ports open faster with no masking

[alimorg]

That is just awesome! very very impressed
Cheers
Al

[JanBros]

Ports open faster with no masking

have you read the entire RSA topics on pitlane ?

Frits/Jan always go for domed piston's, because of the Coanda effect. This effect makes airflow stick to round surfaces, following it. They say it's important for piston-cooling, as the fresh charge coming through the transfers is THE most important factor for piston cooling.

[Luders]

I liked the look of them

[jarno]

=D> =D> =D>

[Luders]

Hopefully this explains to cooling system better for you Dan.

Water is pumped through the engine by the EWP. It emerges from the two outlets in the cylinder head, which feed a T-piece 2 into 1 made of ally, where there is provision to mount a temperature sensor. This hose then feeds into the thermostat housing where it will hit the smaller by-pass hose and route the water back to the pump until the water reaches a temperature of 56 degrees C, where it is then free to flow into the top hose of the radiator.



That left radiator tank is baffled mid way, so the water passed through only the top half of the radiator on it's first pass, then travels down the right tank to flow back across the bottom half of the radiator. This is to increase cooling efficiency.

Once it reaches the bottom hose, it just flows along the ally transfer pipe, back to the EWP, where the cycle starts all over again.

Please ignore the bottom rad bracket, I've not made it yet, this is just a standard one hold it in some kind of position for demonstration purposes only



Here it is again explained with a sketch.

[JanBros]

I wouldn't put the temp sensor there. If your cooling system is as good as you expect it to be - and I'm sure it will - you will only know the temperature of the left cylinder, not the right one. If the right one is overheating, your cooling system might be so good that you will never know untill it' s too late.

you should use one temp sensor after the T , or use 2 - one for each cylinder - before the T. I'd go for the 2nd.

[Luders]

It's just an indication of the water temp Jan, I'm fitted EGT sensors to each exhaust to give me a better idea of individual temperatures. I'll fine tune any differences out, so they should be fairly well balanced from a heat perspective.

[JanBros]

I'll fine tune any differences out, so they should be fairly well balanced from a heat perspective.

I was thinking more like when the right one is developing a problem casing it to overheat (like an airleak causing it to run lean) , you might not notice it

[Luders]

The EGT sensors will tell me that instantly. If I'm relying on the water temp, it will be a delayed reading and probably too late. If I have the sensor after the pipes join, I only get an aggregate reading from both cylinders, so don't know if one side is running hotter than the other. As I have it, there was space to stick a sensor where I did and I'm not relying on ot to warn me of issues, it's just an indication of how the operating temp is and how efficient the cooling system is running.

[TwoStroke Institute]

I wouldn't put the temp sensor there. If your cooling system is as good as you expect it to be - and I'm sure it will - you will only know the temperature of the left cylinder, not the right one. If the right one is overheating, your cooling system might be so good that you will never know untill it' s too late.

you should use one temp sensor after the T , or use 2 - one for each cylinder - before the T. I'd go for the 2nd.

The thermostat will control the water temp, Jan Thiel said to have an excess of cooling and use a thermostat to stabillise the temps.Getting the thermostat to contstantly cycle is the go. I can't see major differences in individual cylinder temps. After the T would probably be a better idea though.

[Luders]

So the EGT sensors have arrived this morning.

I have left and right temp sensors, a tacho, including 2 stage shift light, water temp sensor and warning light and a volt meter on the far right, with switches for all three devices. I have an engine run switch on the left bar to control the power to the CDI and EWP.

[Luders]