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Size of Coolant radiator for 912UL

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mbee1(at)mac.com
Guest

Posted: Sat May 17, 2008 10:37 am Post subject: Size of Coolant radiator for 912UL

Recent test flights indicate very high CHTs on my 912UL. I am  

wondering if

a larger size coolant radiator would help lower the temps. Presently  

using

Evans + coolant. What size rad are others using and where did you  

purchase the rad.



Thanks, Mike

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imap8ntr(at)cox.net
Guest

Posted: Sat May 17, 2008 11:20 am Post subject: Size of Coolant radiator for 912UL

On my Trike UL with the same engine I just put a small metal flange scoop at 

the radiator intake and it cools the water temp down nicely.

Ivan

Phoenix,  AZ

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Sat May 17, 2008 11:25 am Post subject: Re: Size of Coolant radiator for 912UL

Mike,



CHTs with Evans are supposed to be higher than with water-based

coolant.  That said, most people get by with the Europa-supplied

radiator. Some easy ways to improve its efficiency:

Force more ducted air through the radiator by either raising the 

floor of the cowl towards the radiator (many start with a 2-3 inch

gap) or by putting an Aluminum plate on the bottom of the oil radiator

to force more air through both

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Sat May 17, 2008 3:08 pm Post subject: Size of Coolant radiator for 912UL

Mike: I don't know what radiator configuration you have, or where your

radiator is located. The Rotax 912 UL Installation manual suggests a minimum

area of 500 square centimeters (78 sq. in.). Every installation is

different. I have an Allegro 2000 with a 912 UL engine, and a radiator with

an area of 420 sq. cm. The location of my radiator is behind and beneath the

engine and is in a horizontal position. Not a good position in my opinion,

but that is the only practical place for it on my plane. I run a 50/50

water/glycol mixture as my coolant. My engine is fully coweled with very

little ram air area around the OD of the spinner. With this configuration I

have to be careful not to sit on the ground very long on a hot summer day

here in the Carolinas with my engine running, or my CHT will quickly get

into the yellow. However, once I am airborne I have no problem with the CHT

temp.



You can get this same radiator, together with the required expansion tank,

and overflow bottle from Lockwood Aviation Supply in Sebring, FL. If your

radiator does not have at least 420 sq. cm. of frontal area, you should get

a radiator with at least that much area.



Hugh McKay

Allegro 2000

912 UL

661WW



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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun May 18, 2008 7:29 am Post subject: Re: Size of Coolant radiator for 912UL

Hi Mike,



You have three choices here and the guys have hit on them.

1. Larger radiator

2. better forced air through the radiator

3. switch back to 50/50  ( Evans is a very good coolant because it has no corrosion problems and a high boil over temp. it does raise your CHT's approximately 25-40F depending again on the radiator set up. water is able to absorb more BTU's from the engine, but it has a lower boiling point. Going back to 50/50 is ok if you can not get the CHT's back down with the other two suggestions, but then you will need to use the lower CHT/water temp)

P.S.



I almost forgot. Before doing all this make sure your prop is loaded correctly. This will affect engine temps. especially on two strokes.

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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

mbee1(at)mac.com
Guest

Posted: Mon May 19, 2008 5:20 am Post subject: Size of Coolant radiator for 912UL

Thanks for the suggestions.

Mike

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