----- Original Message -----
Sent: Monday, July 10, 2006 12:28
PM
Subject: [FlyRotary] Temperature control
The setup:
·
Engine/Model/Year: 13B 6 port NA mixed
·
Source Condition: David Atkins Rebuilt for
Aviation Application
·
Modifications: Ported intakes and cooling for
180HP
·
Intake: Atkins short manifold w/TWM 48mm
Throttle body
·
Exhaust: 321 SS tangential muffler
·
Engine Control: RWS EC2
·
Fuel Control: 4 Mazda 460cc Injectors, pri. in
block & sec in manifold
·
Fuel Pumps: RWS
·
Cooling System: 2 – 9”x13”GM evaporator cores
with 0.75” auto hose, stock water pump with 180F deg.-thermostat, 50/50
glycol\water mix.
·
Oil System: stock 1986 oil cooler
·
Installation: conventional – self built
mount
·
PSRU/Re-Drive: Ross 2.85:1
·
Prop: IVO Magnum 74" 45-105”pitch in-flight
adjustable
·
Power: 180HP?
The issue:
On the ground, cooling stabilizes at 180-190F deg and oil is usually 10
degrees below the cooling with an OAT of 65-70F deg.
When running with higher OAT (75-85F deg) after about 0.5 hours of
moderate taxi runs (up to 4300RPM) the cooling temps reach 212Fdeg with the
oil about 200F deg.
The question:
Can something be done to get lower operating temperatures without
redesigning the system?
Would switching to pure water help and if so by how much?
Would removing the thermostat help and if so by how much?
How much change should I expect if I were to do both?
You guys down south should have a good idea of how best to enhance
cooling.
What are your suggestions?
Thanks,
Jim Maher(Dyke Delta)