Thank you. I'll go easy on that. But changing the cap back is easy. I am ch
anging all clamps again to narrow stainless worm clamps=2C and I am also ch
anging the hoses to the cylinders to a smaller i.d. silicone for a tight fi
t (next week).
I see on the glycol container that the 50/50 mix boils at 129 C=2C and the
70/30 at 135. So that is a guide for setting my limit on my EIS warning lig
ht.
Karl<html><div></div>
From: budyerly@msn.comTo: europa-list@matronics.comSubject: Re: Europa-List
: Coolant Temps.Date: Wed=2C 2 Jul 2008 17:09:48 -0400
Careful on the 1.2 bar cap. The reduction in boiling over with the extra p
ressure is not worth the potential for leaking hoses. Unless you replaced
all the spring clamps with worm clamps=2C I would not do that.
As for the inlets=2C I leave mine the size they are due to ground cooling.
It's a trade off.
Bud
----- Original Message -----
From: Karl Heindl
Sent: Wednesday=2C July 02=2C 2008 3:43 PM
Subject: RE: Europa-List: Coolant Temps.
Hi Bud=2C Thanks for your recommendations. I am only concerned because I do
n't recall a coolant problem from previous years.I did make anumber of chan
ges to the way the air flows over the engine (Ihave a trigear 912S)=2C but
they should all help with the cooling and reduction of drag:1) I cut back t
he aluminum duct tail end to the radiator and this is the main air outlet t
o the bottom of the fuselage.2) I sealed the gills.3) I taped over the main
stbd Naca duct.4) I closed the outboard 60% of the two round inlets. I don
't see the point of cooling the exhaust pipes.5) I closed the gap between t
he round baffle inlet and the baffle.6) I reduced the height of the main in
let by about 30mm=2C streamlined the interior of the duct=2C and made sure
that there are no more gaps either at the front or around the radiator
s.7) The radiators are mounted just as you described.8) The hoses all hav
e a smooth run=2C and the two main ones to the radiator are silicone and pr
eshaped. In essence=2C I have reduced the cowl openings by 50% and doubled
the exit openings.The performance improvement in the cruise is considerable
. The temperature under the top cowling is around15 degrees C above oat.I s
ee your note about coolant mixture=2C and that concurs with a note in the
Rotax handbook. I think I will try thatand maybe change the pressure cap
to 1.2 bar. Karl<html><div></div>
From: budyerly@msn.comTo: europa-list@matronics.comSubject: Re: Europa-List
: Coolant Temps.Date: Wed=2C 2 Jul 2008 09:53:38 -0400
Karl=2C
Sounds to me like the duct sealing may have been compromised.
Another culprit can be the hose running from the top expansion tank to the
radiator. Sometimes that bend gets pinched a little.
I don't know what engine you have=2C but my experience here in Florida with
the XS cowl and Rotax engines follows:
1. Lower the oil cooler as far down as you can get it. Typically 1.5 inch
es is easily attained. That lowers oil temps nearly 15 degrees.
2. Make sure the cowl seal rubber is doing its job to include around the t
op front of the duct. Any high pressure air getting from the lower duct in
to the cowl cuts cooling. The engine is partially air cooled also.
3. Seal the gaps on the side and below the oil cooler. The duct works bes
t when entering air stacks up and slows down in front of the coolers so as
to get efficient heat transfer. I bend a piece of stainless which I attach
to the oil cooler bottom and bend it to make a nice tight seal underneath
also. When taxiing=2C that really makes a difference. I also continue the
seal back to the cowl exit.
Other techniques:
4. For info only=2C I run 70/30 Dexcool which doesn't boil until 276F vs.
265F for 50/50.
5. Taxi with coarse pitch to get more air in the duct.
If you have a mono=2C I do a number of other mods too numerous to email abo
ut.
Bud
Custom Flight Creations
----- Original Message -----
From: Karl Heindl
Sent: Tuesday=2C July 01=2C 2008 5:06 PM
Subject: Europa-List: Coolant Temps.
After changing all coolant hoses and coolant 50/50 I am now getting much h
igher coolant temperatures while taxiing and climbing=2C typically 25 C abo
ve the oil temperature. In the cruise the temperatures are all within 2 deg
rees of each other. I don't think I had this problem before. The radiator s
its in front of the oil cooler. What could be the problem ? The pressure ca
p is .9 bar.Any suggestions ?Karl <html><div></div>
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