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 2Likes
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1
Post By Aussie Mike
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1
Post By gjkrv8
03-10-2017, 05:44 AM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
Help with exploding thermo fans
Hoping for some advice from the Racers out there, At Race Wars on the weekend my 2 10inch thermofans exploded together at 200kph.....they lost all their blades and only the outer plastic housing was still bolted to the frame, they also took out the radiator....lol.
Was a scary moment.
Now the fans fitted were El cheapo Calibre fans and about 5 years old. Now Im getting a new radiator I want to get decent fans that wont let go at high speed.
Do you think that just fitting a pair of Davies Craig or similar fans will fix the problem or do I need to reduce the air flow to stop the fans overspeeding at high speed?
Any advice?
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RF12 414 Windsor 8 stack ,6spd, Avons
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03-12-2017, 06:57 PM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
is the radiator shrouded? I've seen some shrouded setups that have bypass flaps to allow extra airflow to go around the fans and bypass them thus reducing the airflow forced through the fan blades. At low speeds the negative pressure generated by the fan pulls the flap closed.
Cheers
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Mike Murphy
Melbourne Australia
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03-13-2017, 01:51 AM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
No it's not shrouded. The car ran so cool it barely needed fans.
We think the el cheapo Calibre fans over speeded and exploded. New rad is on the way and will get Davies Craig brand fans. Next year might have to block off some airflow to the radiated
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RF12 414 Windsor 8 stack ,6spd, Avons
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03-13-2017, 09:41 AM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
albanycobra,
This may be of no help if you have to run pusher fans, but I've had my Cobra up to 225 Kmh many times with no problem. It is an inexpensive 12" fan I bought off Ebay, but it is a puller mounted behind the radiator. I control it manually and turn it off when on the track.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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03-13-2017, 07:12 PM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
My fans are puller fans, th y sit behind the radiator.
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RF12 414 Windsor 8 stack ,6spd, Avons
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03-13-2017, 07:19 PM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
Just like Mike mentioned, I had a shroud with vents to allow excess air through at speed.
Never had any problem, I found it was the lower speed events that messed up the radiator.
__________________
Powered by Cu
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03-13-2017, 07:45 PM
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CC Member
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Join Date: Apr 2008
Location: Melbourne,
VIC
Cobra Make, Engine: Classic Revival CR 3505, LS1, T56 6 Speed, VE 3.45 LSD Rear, 6 Spot AP Fronts, 4 Spot Wilwood Rears
Posts: 1,121
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Not Ranked
Quote:
Originally Posted by Gav
Just like Mike mentioned, I had a shroud with vents to allow excess air through at speed.
Never had any problem, I found it was the lower speed events that messed up the radiator.
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Know how you feel :-( |
03-14-2017, 09:39 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Not Ranked
I use two fans with two speed motors from an Audi. Low speed is for normal and you can have a second temp sender, or manual switch for the high speed .. Audi uses them , as do other manufacturers , when the AC switches on it switches to high.
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03-22-2017, 11:14 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 2,752
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They just didn't like the 40's colour Dave.
I cant see them overspeeding. Were they straight (noisy but pull more) or curved blades (less efficient)?
I still think its the colour that made em let go!
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03-22-2017, 11:27 PM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
Yeah.....exit interviews indicate a lack of liking the colour and the course language used frequently when driving.....just like all employees they were replaced with an internet ad....
They were flat blade fans......car never ever came close to overheating. so they served me well....lol
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RF12 414 Windsor 8 stack ,6spd, Avons
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03-23-2017, 03:56 AM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 2,752
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Gt
I like the green race bare bones big cube thing.
Bring it to the nats this year and you can promote your cobra build business!
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03-23-2017, 04:43 AM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
Ha haa....Maybe.....
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RF12 414 Windsor 8 stack ,6spd, Avons
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