Iam putting a plane together but Iwanted to see exactly what engine will be the best engine for this plane. How would i know what engine would do the job? Is it by the weight, size of the plane? Any help will be great, thanks

What plane ?????? Everything you stated has to do with what size, more info is needed.

If it is a kit plane the suggested engine should be in the instructions or on the box. In most cases you should go to the high side suggested. ENJOY !!! RED

its a cessena 182 of the .46 but Iam re-building some parts to make it more duty because Iplan to add attachment to it, so it will be heavier, so that is why, but also after this is done i plan to build one out of scratch and hope for the best. But i will need somewhat an idea what type of engine will be required.

Thank you

That's not a speedy or high performance plane, so a .46 should be fine even with some mods. Be careful adding weight though. You can't really compensate for that just by using more horsepower.

Adding weight increases your wing loading...I doubt you'll going to add so much weight the airplane won't fly unless you're using lead....More power will not compensatr for more weight.....

so ok all the response i have been getting is good, but how would you tell the maxium wing load on a plane? I am very curious this will help a lot. where or what book can i read to get this type information, especially i want to build an actual plane myself. I want to see how that is going to go.</p>

At the top of the kit building forum is a very easy wing load calculator on a sticky. Go look. Then you have to .Ask yourself what your wing loading is telling you. Some people tend to give wing loading way too much thought and worry about it a lot. If your a kit or scratch builder you try to keep the weight down on your builds but there is a point where you just have to say it is what it is and be happy with it.
The one book I use for scratch building that goes into wing loading is one buy Gordon Whitehead called Scale Aircraft. The book is long out of print but often found at very stupid prices on Ebay.

nitrohunter, Every thing else being equal, a heaver airplane will require more airspeed to become airborn (takeoff), and more airspeed to maintain flight than a lighter version of an identicial airplane. So, all a larger engine will do is get the plane up to flying speed quicker for takeoff. If your flying off tall grass with a short runway this may help you on take off. Thats all! Once in the air at altitude you will back off the throttle and fly at 1/2 throttle or whatever is needed to maintain airspeed for flight. I have a Great Planes 40 size Cessna ARF powered by an O.S. .46 FX, just flew it last Saturday, and flying off grass the .46FX gets it airborn with ease. If your Cessna 182 is similer in size then a .46FX or .46AX is great but if you still want to upsize the power then an O.S. 55AX will fit right in as it is the same outside size and weight, just more $$$$.

I have both the OS Max 46 AX & 55 AX.....stay with the 46 AX.... the 55AX is a finicky little sucker.... while the 46 AxX is reliable & powerful.

The 46AX is a joy to fly and plenty of power for your 182... an 11x6 prop should work quite well with it.

-Chuck