hi martin,

there is much more compression on a .46 or .60 nitro plance engine than in a .18 nitro engine. I was actually at my lhs talking to the guy about an hpi nitro star.15 and was saying it has like no compression when you pull on it but yet it runs the truck like a raped ape. he said that as long as it runs good, runs steady and has power then dont worry.