Super Jet Whats up with a "flat top"motor"?

[yankeeboy]

Back on topic for just a sec, if you dont mind gil.

Does anyone know if the port shape has any correlation to the type of piston? For example could i swap domed pistons into my "flat top motor" or vice versa, and have it work relatively the same? Obviously domes would be changed.

 

[Matt_E]

They are not interchangeable. The distance from wrist pin to piston dome is different, so the port timing would be different.
A flat top engine is specifically ported for flat top pistons.

 

[WFO Speedracer]

That's it on my next Kawi build I am defiantly running flat top pistons. :naughty:

 

[sjetrider]

All I can say is the flat tops always seemed to rev faster than the domed pistons, of course this could be simply due to weight differences?????

There is a noticable difference though. However there is some machine work and dome figuring to be done, you obviously cannot just throw flat top kawi pistons in your motor and expect it to run.

 

[Pablo]

If it has kawi anything in it u can't expect it to run too well.

 

[WFO Speedracer]

You are correct, I can expect it to run extremely well.

 

[D-Roc]

I know for sure that flattops always work better when installed in a yamaha than in a kawi. It's true. I built a motor once an I told myself so.

 

[GIL]

This thread is now de railed. Where is Wingnut?

 

[D-Roc]

Building my carbon stunt I hope. If I am riding for stunt next season I need the hull soon so I have time to assemble it.

 

[Pablo]

Hide and watch.

Building my carbon stunt I hope. If I am riding for stunt next season I need the hull soon so I have time to assemble it.

 

[Pablo]

you very smaaat Danielsan.

This thread is now de railed. Where is Wingnut?

 

[GIL]

If it were me, (and thank GOD it's not), I would probaly go start another thread asking about what is better, 0*, 2*, or dome top* pistons..............

 

[WaveDemon]

I run huge domed pistons.

 

[GIL]

I run huge domed pistons.

View attachment 163575

dammit boy! What kinda squish relief you gettin with those bad boyz? -.047 ? LMAO If I had a pair of those I wouldn't even need domes. lol

 

[SuperJETT]

reverse dome with ring grooves:

 

[chriselmore_1]

Lol

 

[D-Roc]

dishtops. Sick.

 

[WFO Speedracer]

I have always been partial to these

 

[GIL]

Wingnut???

 

[wsuwrhr]

dishtops. Sick.

Like a diesel piston. think of the extra fuel storage area.