Engine Position and Engine Mount Quection? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-28-2010, 04:37 PM   #11
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Re: Engine Position and Engine Mount Quection?

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Originally Posted by Shotgun06 View Post
I will re-post this here as nobody seems to be willing to give me an opinion in my building log...

So here it goes; I have some kind of a dilemma to resolve and I am looking for some opinions...

I am starting to install the engine and I am not sure if I should use the aluminum engine mount that comes with the kit or the plastic one from a different manufacturer that I have and that seem to be a perfect fit for the ASP 61fs???

So basically: Aluminum or Plastic? Pros and Cons...
More important is to use one that fits properly. If to much force is used mounting an engine in a motor mount with a poor fit you can distort or stress the crankcase and cause engine damage. The crankcases are light weight thin castings that can be easily distorted and/or broken if not careful.

Originally Posted by Shotgun06 View Post
Also, should I mount the engine inverted or sideways??? Sideways, the rocker cover would be protruding from the engine cowling and the needle valve would stick out from the top of the cowling. Inverted, the engine would be totally enclosed and would get cooling from the air scoop but might be a little less user friendly...

So basically: Sideway or inverted?

What do you think?

When in doubt follow the recommendations of the kit manufacturers as the fuel tank location may be fixed and not easily adjusted for different engine positions. Center line of tank as close to the centerline of the spray bar in the carb works best.

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Old 05-29-2010, 12:55 PM   #12
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Re: Engine Position and Engine Mount Quection?

I started installation of the engine and used the provided aluminum mount (Sig kit) and installed the engine sideways. The instructions are mentioning that you can install the engine inverted but are showing a sideways installation. Considering the different opinions shared by you guys, I would say that choice of the engine mount is more like personal preference and I choose the sideways install as the benefits seems to offset the small visual detractor...
Disclaimer: Having said that, this is just my personal opinion, I might be wrong, please don't quote me, have a nice day.

Last edited by Shotgun06; 05-29-2010 at 12:55 PM. Reason: typo
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Old 05-29-2010, 03:04 PM   #13
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Re: Engine Position and Engine Mount Quection?

Here is my opinion, having probably mounted and flown over a hundred various engine/planes in the past number of years..

Glass/nylon (Dave Brown, Kraft-hayes, etc) mounts serve a purpose. They are light. fairly strong yet can still break in a crash saving possible damage to the engine. I have used those supplied sheet metal screws, and on engines under .40 size, if you drill the right size hole they work well. The nylonholds the screws tightly and I have never had one back off. I have also drilled right through and used a machine screw and locking nut on larger engines. I have never personally had any mounts soft enough to have the engine lugs sink into the mount.

Aluminum mounts are superior in terms of being stiffer, and no flex even under extreme load (like racing type engines, or large displacement 2 or 4 strokes). They can be drilled and tapped and certainly are stronger, but can also weigh more. They also have a heat sink effect which can pull some heat away from a hot running engine (advantageous in some instances).

Both, in sport/general use (not talking racing here) are fine IMO.

As for inverting engines, its not bad for the engine, but you certainly have to be careful, thats all. Just takes some care to prevent hydraulic lock.

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Old 06-10-2010, 12:23 PM   #14
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Re: Engine Position and Engine Mount Quection?

Good day everybody, our friend here has asked a very basic and interesting question judging by the replys and Im sure every one here has had success with their prefered method of engine installation, I will only state the engine installation method I use because its the BEST METHOD FOR ME, I install 2stroke or 4stroke engine about 30-45 degrees below horizontal the idea is to get the exhaust under the belly if you ever run a tuned pipe on a side exh. engine you see how easy clean up is . Starting and running is trouble free. Good luck with your model flying.
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Old 06-10-2010, 01:17 PM   #15
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Re: Engine Position and Engine Mount Quection?

a word of warring if you are doing a inverted mount ..if your engine sticks out the bottom of your cowl and your gear were to give out on you,you could do some serious damage to your engine. food for thought. donít ask me how i know.

ps i prefer the H9 engine mounts they have the slots for the bolts that slide.takes the guess work out of measuring for the cowl clearance to the prop or spinner

Last edited by PurgatorY; 06-10-2010 at 01:19 PM.
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