Ok, went back and looked at the engine catalog in the box. Did'nt reliese that the sf was also a c/l offering. So I have an OS 46 SFabc r/c engine and am thinking about making a stunt engine out of it. Are nva and venturi's available for this set up? Will they run ok? Or just leave it alone?
I haven't personally owned one, but I have spent a fair bit of time helping others with theirs.
Straight out of the box, with the muffler outlet opened up as much as it can be without cutting off the nipple (we used a Fox prop reamer, right there in the grass in a contest), and typical 46VF props like a 11-4 3-blade or a 12-4 2-blade, it runs very nicely in a constant rich 2 with a lot of power.
I was also very impressed with the Randy-modified version as a 4-2 break motor. One of the San Diego crew ran it a slightly-cut down Cardinal and I thought the engine was about as strong as an average ST60, although maybe not a really strong ST60. If you aren't into some development work that might be required for the stock engine, this would be my recommendation.
The knock that you will hear (and I am sure there are 4 people typing this right now) is that it's heavy. That may be, but within reason I wouldn't choose engines based on weight.
Brett