Here is my initial review of this engine.
I have ran a few engines in my time. Jp's, RB's and Piccos. And i am trying to cut back on my RC spending and save a bit on engines. So i decided to give the STS a go.
Firstly I opened up the engine. The backplate makes an excellent seal. When i open it up i found a few brown marks on the inside of the crankcase. No problems I decrese it and put after run oil to prep it for run in.
The engine has a very large cooling head. Similar size to a WS7II head. p.s a nova and rb 4 bolt head fits
One thing I dont like is the HEX screws on the engine. I don't like it coz dirt gets traped easy, causing stripped screws, I like the rb and novarossi flat head screws.
Also the carb doesnt have a o-ring on the top of the carb throat. it has one in the crank though.
Anyway, the engine starts without fuss and idles great. I have only done 1/2 a litre run in so far
As for the power, it has pretty impressive bottom end. I would rate it above that of a S7 though not as good as a P5.
It has decent top end. A bit less than a S7.
This may change as I run in the engine more as this engine is still very tight.
So far, so happy which this engine.
More to come as i start racing with this engine.
Also when is the D21T
going to be available? and is there major difference other than the turbo button head?