Hello all, I'm not sure where to put this post so here goes, it can be applied to any engine.....

I built a spare motor for my Cen Genesis that has basically the same components as original (NX76). I would like to see if it starts and break it in, however it is just he engine and components such as fuel tank, carb, air cleaner, pipe, pull-start, chassis, etc. Everything but there is no clutch or flywheel or anything, just the crankshaft sticking out [through the crank bearing] . My question is can I run it like this, without any weight or tranny or anything connected to the crank? I know I've read you need to have a prop installed to break in an airplane engine for weight and was wondering if the same rule applies to a land-based engine. I don't want to over-rev it or blow it up before it's in a vehicle

Thanks a bunch I appreciate your time,

-Joseph

Yes teh same applies to rc engines. You need some kind of rotating mass to slow the rpm's down at idle. You pretty much need the whole clutch and bell setup to do this. Do not run it with nothing installed.

Great! I appreciate your reply. For a while I toyed with the idea of mounting "something" on the shaft, but soon the idea of that "something" flying off at 20,000rpm put that to bed.

Thanks again,

PS: Since youre in a talkative mood, would you mind clarifying the RC engine-block size nomenclature? As an example; I see ads for trucks that have a 4.6 engine, which logically would mean that it is much larger than the .46 in the Genesis - I assume the ?size/weight? and the CCs are used interchangebly to [whomevers] advantage? Does that make sense? So the 4.6 is the CC and the .46 is some sort of other figure? I know the Genesis is 7.6cc but what exactly does .46 describe, the weight?

-Joseph

I believe it is cc and the .46 would be cubic inches not cubic centimeters...I have a 4.60 Monster GT and it is a .28. So 4.6 would be cc and .28 is the c.i. I could be wrong though it wouldn't be the first time or the last...

Makers interchange Cubic Centimeters and Cubic Inches. After all, which sounds better, a .21, or 3.5?
.46 (cu.in.) is the same as 7.53 (cc)
4.6cc is .28cu.in.

Best program EVAR!
http://joshmadison.com/article/convert-for-windows

Suddenly RC displacement makes sense, I really appreciate the info.

-Joseph