I just came across two new cox cylinders/pistons/crankcases to use as spares with my current engines. I noticed the fuel ports are similar to the picture of the venom cylinder at:
http://www.mh-aerotools.de/airfoils/cox_venom.htm
I've placed a picture of my cylinder below(hopefully, this is my first time uploading pics). Is this a high performance cylinder?
Also, I've had a hard time finding 1/2a fuel locally so I have been using O'Donnell 30% nitro RTR. They say it has a high percentage of synthetic and castor, but won't tell me the ratios or total percentage. My question is whether this fuel will destroy my engine or is it ok to use?