ESP championship ported engine rebuild

[Suomipoika]

I did wonder how come my esp engine has no good low end when i did drive it
yesterday..
So i did open the engine and did rebuild it today..
First thin i noticed that oil seals were let some water in, since i was running my baja in snow yesterday..
My crank case is made by cy, so the quality is what it is..

Also changed new clutch housing because one thread were run out on one corner.
Reason why there was not low end was seized piston....


Lucky me that the cylinder had no injury of that..



I used viton oil seals, best there is.


Also put new bearings on the engine and i used team fast eddy bearings.
Last time i build this engine i used that black gasket between cylinder and case and it let the squish about 0,62mm, so i dropped that even smaller by using 0,15mm copper gasket, now the squish is 0,50mm.

There is still -0,20mm too much air between piston and cylinder top, but i did not had so thin gasket on my box, so i am going to try that now.
Must say that the compression is now really hard, and i bet that the engine has more that low end grunt now than it has never had before..
Gizmo motors have even thinner copper gaskets, so if i need more compression to my engine, all buy that 0,10mm gasket or go grazy and use gasket at all, but just hylomar on to the gasket and then the squish is 0,35mm, but then we are so close to the minimum as we can...
Hope that i could take test drive tomorrow, but it looks outside now - 20´celsius, so if it´s not get higher it will be some other day..

[Dave]

Nice work !

Where do you get thoose sealings ?

One hint, though....
Not just for you, but for all bashers out there....

Be very careful when you shrink the squish in a rebuilt engine !
The cylinder head has been working for quite some liters before this work has to be done, and it will have some wear inside from the piston ring.
Above this old measurement in height, the plating is unused and could be slightly more narrow than the "used" area, and could ruin the new pistonring very quickly.

Keep temperature under observation during break-in !

[Suomipoika]

Hello Dave.

I know, too litle will do bad to your engine.
Here in Finland couple of petrolheads has sone that job, and minimun of squish is 0,35mm and that is with really good bearings, not what the stock engine is from.
My engine is still quite safe area when that squish is 0,50mm, but there is not much play around if something is going to happening on the needle bearing or in the crank bearing..
i did run that engine for a few minutes after i had build it, but for sure not top rpm`s of it..
Maybe tomorrow if that freeze is let it down, i will test that engine better.

[Suomipoika]

Man, i am so pist off of this engine..
Did do even worse that low end problem even it gain compression..

Those viton type seals i bought from innovative-rc.
http://www.innovative-rc.com/crankcase- ... c5cd6ed272

[Suomipoika]

I changed clutch spring yesterday to 8000rpm model and that did the trick.
Man, now im start to like this engine...




Start to think some other type clutch, those deam springs are gettin loose quite fast in this normal type clutches..
No matter is it hpi 8000rpm model or ddm premium ones..