Wings Forum

b1x4nqb · Joined: 14 Aug 2006 Posts: 176 Location: Orwigsburg, PA

Got my exhaust back and put it on. They did nice work! I also had them make me up a set of exhaust shrouds for both carb heat and cabin heat. Everything finally fits after setting out to mount the airbox. The oil tank fits nicely on the right hand side. Cowling is about fitted, need some #6 camloc's. I thought #5's would work but some of them are just too short. Rolled it out tonight once I had the exhaust on to put the prop and spinner on for motivational sake. Took these photo's. Primer should arrive sometime next week.

Goal is Fathers day. That time is getting here faster than I expected. Gotta keep going and "get-r-done".

Paul, PA

Wes · Posted: Sat May 03, 2008 8:18 am Post subject: Looking Good

Paul,
Wow, looks great!
The airbox fit up looks like a 'pro' job. I'm envious, but I think it falls into the "renovations-down-the-line" category for me.
I need to finish the wings and get this bird painted.
Are those the standard main tires? The ones supplied on my kit are 'Air-Trac' 8.50-6 and have tread grooves.

Keep up the first class work!

Wes

b1x4nqb · Joined: 14 Aug 2006 Posts: 176 Location: Orwigsburg, PA

Wes,

The tires are Goodyear Aircraft Tires. They are a size 26x10.5-6 smooth tubeless. To be totally honest I ljust loved the look but argued with myself that they would be the way to go with operating out of the front yard and adjacent fields. I park the plane through a 7x9 garage door by backing it in. With the prop turned in a certain position (like the photo) I need to lift the tail to clear the entrance before lowering it again. Never thought I'd have that issue. The extra tire size contributed to that minor inconvenience. I will always have to keep an eye out when parking it.

The airbox was a large project in and of itself. Finally getting it in and getting everything to fit is a relief. Going to buy some angle bracket material to mount the oil tank, oil cooler, etc. Also finishing up a few tapes that are around the handle in the back, etc. Need to build a paint booth tomorrow.

Paul, PA

082 · Joined: 16 Feb 2008 Posts: 7 Location: wisconsin

Paul,
Nice job! Looks great!
I have a couple of questions. Is that the standard engine mount? What did you do to get the air box to fit? Is that a custom exaust? It really looks nice. I intended to build a 4 into 1 but if I don't have to reinvent it I could spend the time doing other things.
Dan

KevinC · Posted: Sat May 03, 2008 12:42 pm Post subject: exhaust

That is the 4-into-one from Aircraft Exhaust Inc., if I am not mistaken. http://www.aircraftexhaust.net/rotax.html

BTW - I talked with those folks about two weeks ago when I bought my heat shroud. Apparently they've made some upgrades to the muffler system to 1) drastically reduce noise an 2) set it up so it doesn't blast the gear. FWIW

K

scubarider2 · Joined: 28 Jan 2008 Posts: 192 Location: Cleveland, GA

Looks great Paul. I hope you used the "right" lord mounts for the 912uls. At 54 hours now the front two on mine are really showing wear. I am putting it off as long as I can in replacing them.
Keep going!
Dennis

b1x4nqb · Joined: 14 Aug 2006 Posts: 176 Location: Orwigsburg, PA

Dan,

Kevin is right, it was made from aircraftexhaust. Also, the mount is the standard one from the factory. Because Troy refused to take the time to make me up a modified mount I was forced to modify the L brackets. In turn I also had to modify the engine mount (crossover diagonal), the cowling, both rear coolant lines, and of course the exhaust. Actually the exhaust was one of the first 4 made and had multiple revisions since I got mine. I had issues from the start and it wouldn't fit without hitting my engine mount before these changes. The designed was great to work with and took the time to have mine updated to the current adjustments that are being designed into new exhausts built today. After just getting it back and after making these other changes while it was out for adjustment, I'm happy to report a perfect fit. To summerize I had to push the engine out 1.5 inches, raise it .5 inches, cut out a center section of the diagonal support in the center of the engine mount then weld on a new piece to support the chopped out piece, have 1.5 inches added to the cowling rear, replace the 2 rear coolant pump outlets to straight outlets from bent ones, extend the hoses coming off these to allow the extension, and finally make sure the exhaust had the proper clearance. Troy told me about an experiment where they tilted the engine up 3 degrees in the front and it apparently made a huge difference in the takeoff performance. I therefore took this into consideration when drilling new holes in the L brackets. It was only about 1/8 inch difference for me. I went on the conservative side and raised the front up 5/8 vs the rear 1/2 inch.

When I pointed out the issue with hitting the exhaust gases on the crossover bars on the gear, Mark (the designer) said their is no issue with them being hit from a structural standpoint and that the gases are designed to pass over the bar. I'm going to try it and adjust later if necessary. For now, I'm shooting for "Get-R-Done". As for the quietness, Mark also said it was designed for performance so I'm going to see how bad it is and again, adjust if needed. I have my eye on an aftermarket "super trap" exhaust if I need to adjust it. Also, I placed a black neoprene type of insulation in between the skin from the firewall to the rear of the baggage area. This was based off the quietness from doing the same thing in another Highlander that Troy built. Troy said it weighed very little but made a world of difference. We'll see. Was a pain in the neck to install.

Dennis, I ordered 6 new Green "Firm" mounts from LEAF yesterday. I called them because they had another one that was labelled "Hard" for $2 more. They said that # came back to the Firm ones so I ordered six of them. I'm bighting the bullet! I hate to waste 6 good ones but they won't take them back. For the sake of $50 I don't want to have to replace them for awhile. I also sanded down the L bracket hole edges (bottom and top) to try to do everything I can to prevent the edges from having a sharp edge to bite with when vibrating.

Paul, PA

gme9261236 · Joined: 27 Jan 2007 Posts: 88 Location: Hampton, NH 7B3

Those mounts look vaguely familiar. Plane looks great, I like how the exaust and airbox came out. It seems like every new picture I see on this site brings up one more great idea. Everyone ends up being a pioneer for those to follow.

billy5823 · Joined: 16 Oct 2007 Posts: 36 Location: murphy

I got my new exhaust on yesterday the tuned 4 into 1 yall are talking about help performance alot but it is loud as heck. about like a 4 cylinder dirt track race car. i can live with the noise for the added power. thanks billy

b1x4nqb · Joined: 14 Aug 2006 Posts: 176 Location: Orwigsburg, PA

These last few weeks have seen little work on the plane. I did manage to get a Supertrap exhaust tip on to quiet it down some based off others reviews. I know of one other Highlander with one and I really liked the sound of it.

Today I started mounting the oil cooler but got delayed when I needed parts (see other post). Tonight I also managed to set up the panel to begin mounting it. I'll try to set it permanently tomorrow sometime. The sides of the top panel still need trimming down to the boot cowl but it is coming together nicely.

Paul, PA