----- Original Message -----
Sent: Sunday, April 10, 2005 6:57
AM
Subject: [FlyRotary] Re: SQ2000 flying
again
Paul,
For
a pusher, your temps don't sounds too bad really. If my engine is hot
when I take off, I can see coolant temperatures over 200. Normally my
temps stabilize at about 180 coolant, and 160-170 on the oil. If I fly
at reduced power, which I do to nurse my stock turbo along, I see coolant
stabilize at 160 and oil about the same.
If
you have any leaks around the radiator, it can greatly reduce the coolant
efficiency. I don't know how true it is, but I once heard that a 1/8"
gap can result in as much as a 20% decrease in cooling
efficiency.
I
think that you are much closer than you think on the
temps.
Steve Brooks (too much house building and not enough
flying)
I flew the SQ2000 today. The engine is running
great, now that I have a seperate water temp sender for the ECU and another
for the engine monitor. The outside air temp was 80 degrees, and I am very
disappointed with my coolant temps. The water temp hit 205 during the
climb. Temps slowly came back down to 190 once I was in level flight,
and dropped to 170 on short final. Very disappointing. (oil temps were
fine). I am going to seal all the gaps around the radiator first, and
see if that helps. I am concerned that the new ram air scoop I made to
bring in cool air to the throttlebody might be pressurizing the rear of the
cowling, and inhibiting the induction of air through the radiator. I will
try sealing around the radiator first. If that fails to bring the temps
down, I will try removing the ram air scoop and installing a NACA scoop with
a hose to bring air directly to the throttlebody, and not dump it into the
low pressure area of the cowling. If that fails, I think I will take
up fishing or golf.
Paul Conner, 13b
powered SQ2000 in Mobile, AL
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