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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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 Posted: Tue Jun 22, 2021 6:32 am Post subject: Coolant Hose Routing |
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Hi All
A quick question on the routing of the coolant hose from the collector pot south to the radiator.
My 912s as supplied has the collector pot sat on top of the crankcase (with the little rubber pad). The outlet faces directly aft towards the firewall.
Having fitted the ring mount, I know find that the one inch (25mm) outlet for the coolant pipe to the radiator is at the same level and about one inch from the ring mount making the fitting of any coolant pipe impossible without some serious relocation of the collector pot.
Anyone else had this problem?
I might be able to raise the pot high enough to go over the ring mount or the other option is to rotate slightly and take around the port side of the upper part of the ring mount, but this looks like it might conflict with the port carb.
I am not even going to mention the water pump pipework - did Rotax design this mount to fit their engine?
Anyway, water pump and lower hose routing now sorted thanks to previous forum posts from Bud and others.
But this upper coolant pipe is proving to be a pain in the backside. Even if I do get it over the ring mount, it looks tight to get down to the radiator past the Europa engine frame.
Any advice?
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_________________
Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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Patrick Tunney
Joined: 24 Sep 2010
Posts: 33
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| Posted: Tue Jun 22, 2021 10:57 am Post subject: Re: Coolant Hose Routing |
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Kevin see attached image, hopefully this will help.
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Last edited by Patrick Tunney on Tue Jun 22, 2021 11:30 pm; edited 1 time in total |
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rowlandcarson(at)gmail.co
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| Posted: Tue Jun 22, 2021 2:15 pm Post subject: Coolant Hose Routing |
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On 2021-06-22, at 15:32, Kelvin Weston <kelv(at)kdweston.biz> wrote:
| Quote: | A quick question on the routing of the coolant hose from the collector pot south to the radiator.
My 912s as supplied has the collector pot sat on top of the crankcase (with the little rubber pad). The outlet faces directly aft towards the firewall.
Having fitted the ring mount, I know find that the one inch (25mm) outlet for the coolant pipe to the radiator is at the same level and about one inch from the ring mount making the fitting of any coolant pipe impossible without some serious relocation of the collector pot.
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Kelvin - I also had problems routing the C04 hose. I started with it going down the outside of the engine mount adjacent to the footwell, but later decided to move it in board of the mount, because it was too close to the air filter. Here are links to some photos of my installation. The whole setup is not typical of a 912S installation as I am using Nev’s cowl and his baffle arrangements (but not his mount). So, I don’t have the usual plenum chamber for the carb intakes. But I think the C04 routing issue arises anyway - there is barely room for the hose between the mount and the footwell.
http://www.rowlandcarson.org.uk/aviation/europa_435/c04_route_test.php
http://www.rowlandcarson.org.uk/aviation/europa_435/water_hose_route_a.php
http://www.rowlandcarson.org.uk/aviation/europa_435/c04_filter_foul.php
http://www.rowlandcarson.org.uk/aviation/europa_435/c04_protection_b.php
http://www.rowlandcarson.org.uk/aviation/europa_435/c04_baffle_slot_a.php
Hope this is of some use.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 282
Location: Florida USA
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| Posted: Tue Jun 22, 2021 3:51 pm Post subject: Re: Coolant Hose Routing |
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Kelvin,
I've never had a great deal of difficulty but as you are well aware, we all have to adjust things around to get everything to fit. It is a game of fractions of inches.
In installing the ring mount, I modify the angles on the water pump inlets from cylinders 2 and 4. I personally run them through the V. I do a considerable amount of preplanning before I mount anything anymore. Blindly following instructions in a hope it all fits has never worked out for me on any of the homebuilts I completed. I'm not a mechanic, I'm a dumb old pilot with an engineering degree that has learned almost everything the hard way. Take notes, take your time, trial fit everything. I use many 3/32 clecos to keep the holes small when fitting.
On the one inch hose coming from the top of the spider to the port side cooler inlet I do the same for the 912S as the 914. I carefully measure and mark the hose from the spider to the inlet area of the port carb and airbox. I install the 1 inch hose after cutting so the hose lies right on top of the ring mount. I slip on a piece of hose to the M10 bolt threads attaching the ring mount to the engine frame to prevent chaffing. I normally do not bolt up my duct until I run the one inch hose down to get the clearance I want from the engine and firewall studs. Once I have the hose planned, I fix the duct where I need the nipple to fit. I then fit my duct. With the duct all clecoed final in place, I then cut my hose.
I have one 912S aircraft that required me to take the hoses off the spider and slightly elevate and twist the spider to fit the 1 inch hose exactly where I wanted it to go. Alas, I had to buy a short piece of 17 mm hose from Rotax as I needed #3 upper hose to be a bit longer. I did not put a block under the spider tank. It hangs on the hose and has worked for many years. I'm attaching a photo from a complaint I had with my painter on that particular plane. Rather dusty engine with a lot of overspray which I later made him clean but it shows the upper hoses and how it laid. See attached.
Finally a technique on hose access. I make my side supports that hold the duct up with holes on both sides for easy access to the clamps. I actually modify the port brace to allow the duct to slide up and down past the muffler for a quick duct drop if needed. Of course, nut plates everywhere in the firewall/footwell. That makes for much more comfortable duct removal.
I have made modifications to the rudder return spring holder bolts to protect the rubber down pipe where they interfere. Normally an acorn nut on the end of the threaded bolt for a smooth surface touching the hose if it is only close. If really tight, because the duct is placed too far aft, I fashion a piece of aluminum as a protective buffer. If the duct was moved too far forward or back, I sometimes just repair and move it. It happens.
Best Regards,
Bud Yerly
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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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| Posted: Wed Jun 23, 2021 1:29 am Post subject: Re: Coolant Hose Routing |
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Thanks to all for the info and pictures.
I was concerned that the spider collector pot would end up 'floating' on the hoses and that the coolant pipe would be sitting on the ring mount. However, from the pictures, it looks like that is the way to go.
Bud:
I agree, I'm planning ten steps ahead all the time and almost have the whole engine installed before I finalise any drilling, fitting, etc. If I don't put it in and take it apart ten times, I start to wonder what I have done wrong!
The water pump pipes to No 2 & 4 now go nicely through the 'V' in the ring mount but only after removing the pump, the pipes, cleaning the threads and trial fitting about a dozen times.
Rowland:
I have the same arrangement - Nev's cowl (might have been the last he made) with the original engine mount and without the airbox.
I do visit your site extensively to view your pictures and I think I am just behind you with my build. I actually tell my wife you are to blame for my extended build time because I have to wait for you to post pictures before I can start Ha! Ha!
Thanks again everyone.
Just the engine and cowl to do and she's done 
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_________________
Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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