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Sideways or Inverted?

General tips please.

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Ross Clarkson28/04/2010 01:08:18
1438 forum posts
106 photos
Hi all,
I will be fitting a SC61A MkII Series engine in my VMAR Bulldog which i am currently putting together.
This will be the first time i have installed an engine in an aeroplane so i was just wondering whether anybody has some general tips so i hopefully get it right first time?
What would be best, sideways or inverted or does it not make much diffeence? Also, i am sure my engine with silencer on may not fit as the silencer is too long. If so, how would i overcome this?
Paul Gauci28/04/2010 01:19:48
23 forum posts

 not having installed an inverted set up I can't really comment on that, but I have a sideways mounted OS-61FX in a groovy 50 3A and it works perfectly, except I had lateral balance issues, nothing a bit of lead on the left wingtip didn't fix though.
    Inverted would have been neater in my plane, but I went the "safer" route of a sideways mount after a few people mentioned inverted might be an issue with relative carb to fuel tank height and flooding etc so I just went with what I knew wouldn't be a problem for my particular plane design.  

Edited By Paul Gauci on 28/04/2010 01:20:27

Aslan28/04/2010 08:26:27
451 forum posts
1 photos
Sideways would be a neater fit Ross,with the silencer exiting the bottom.
John Privett28/04/2010 11:10:25
6108 forum posts
243 photos
Quite a few of my models have the engine mounted so the silencer exits along the bottom of the fuselage.  This means the engine is mounted "sideways plus a bit" so it's somewhere between sideways and inverted.  Hope that description makes sense!
Lee Smalley28/04/2010 12:20:08
2125 forum posts
68 photos
2 articles
sideways or inverted make no difference as long as you insure the tank position is still fractionally below the carb line
Ross Clarkson28/04/2010 17:03:01
1438 forum posts
106 photos
The silencer just seems too big with my SC61A MkII Series and fouls the bulkhead and will be very visible if i fit this one.
Does anybody know if i can change the silencer for this type of engine to a more compact one? 
Rob28/04/2010 17:16:44
246 forum posts
1 photos
just engines do a great range of after market silencers including a pitts style one that sounds like it could be the answer to the problem.
Ross Clarkson28/04/2010 17:32:05
1438 forum posts
106 photos
You are a genius Rob, just the stuff, Cheers.
Stephen Grigg28/04/2010 17:33:31
8691 forum posts
1128 photos
Is it 2 stroke or 4 stroke Ross
i12fly28/04/2010 20:12:04
652 forum posts
22 photos
My SC61 is sideways, starts and runs beautifully. To resolve the interference you could an extension piece between engine and silencer (I think Just Engine sell them)
Ross Clarkson28/04/2010 21:22:53
1438 forum posts
106 photos
2 stroke Stephen. I dont think a 4 stroke would have had the same problem as thier silencers are much smaller aren't they?
Cheers i12fly, i have contacted Justengines and they will be getting me a BCM Pitts muffler which looks awesome.
I don't really want the the big traditional silencer sticking way out underneath.
John Laird29/04/2010 08:41:12
450 forum posts
61 photos
only problem I have experienced with inverted is damage to the engine if taildraggers nose over on landing -  our field is concrete/tarmac pad
Steve Hargreaves - Moderator29/04/2010 10:01:57
6765 forum posts
199 photos
Pitts silencers can be a bit loud in my experience.....I had to fit an extra box as an "after Silencer" to mine to keep the noise down which kind of negated the reason for fitting it in the first place!!!
mothy12/05/2010 20:39:54
5 forum posts
Sideways or inverted is not a problem. Whatever fits and is consistent with getting a match between tank fuel level and needle valve level. In my experience (30 yrs) needle valve level needs to be about two thirds up from bottom of tank level. Do be aware that inverted engines, if flooded, can lock up and a powerful starter might bend the con rod. The 45 degree mounting which puts the silencer along the bottom centre line is a good way to go but still prone to flooding lock up.
Ross Clarkson12/05/2010 23:14:40
1438 forum posts
106 photos
Cheers Tim and thanks for the tips,
I have mounted it sideways and levels should be fine. Just on too installing tank tomorrow.

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