- Detta ämne har 14 svar, 3 deltagare, och uppdaterades senast 2012-07-11 19:26 av .
- Inlägg
Hey Fellow 92 fans,
I thought you might enjoy photos of:
-a 13″ aftermarket radiator fan:
http://home.comcast.net/~jimpascale/pwpimages/P1050392.JPG
I was told a 13″ oversized fan would work better than an 8″ fan.
I will miss the cool radiator blind but I need to keep my engine cool in the summer and I store my 92B in the winter anyway.
-a ”customized” overflow reservoir (it is an empty water bottle :))
http://home.comcast.net/~jimpascale/pwpimages/P1050393.JPG
Jim
(I took the freedom of inserting the pictures in the tread. Morten Strandmoe, moderator)
Is this a factory made ”push” fan, or is it a puller that you’re running with reversed polarity?
If it is a pusher, I think many would be interested in where you sourced it!
/Magnus
Hey Magnus,
It is a 6V pull fan from Scott’s cooling fans, here:
http://scottscoolingfans.com/
They recommended a puller, saying it’s more effective than a pusher, & that a puller will also put air over the engine that will help, even if the air is hot.
JimErm. A puller. Shouldn’t it be fitted on the other side of the radiator then? I mean, as of now it’s actually worsening the cooling by counteracting the stream of air entering through the grille! Unless you’re running it hooked up backwards of course, effectively making it a pusher after all.
It is actually a ”puller”. The fellow at Scott’s cooling fans felt a ”puller” would be more effective.
Overheating for me occurs when the car is stopped in traffic. A ”puller” will pull air, even if its hot air, across the engine.
I am no expert. This is just what they told me at Scott’s cooling fans.
The real proof question is, ”how is it working? The answer is, ”excellent”. Stationary in 90 degree F the temp. gauge stays between 80 & 90. 🙂A puller IS more effective than a pusher by nature, ’tis true, but when they recommended it to you – were they aware that your car has the radiator behind the engine rather than in front? I’m sure it helps this way too but reverse the direction of airflow and I promise you even better results.
By the way, if you run a pull fan backwards you actually get MORE air thru it than if it were a push fan of similar size – but you lose a bit in effectivity (measured in watts of electric power per cubic meter of moved air) compared to a true pusher fan. Also, it will run a bit noisier.
@5692B wrote:
A ”puller” will pull air, even if its hot air, across the engine.
So would a pusher, but it would be cool outside air entering thru the grille rather than air heated up from passing thru the radiator. Not that it matters – water temp is what keeps your engine cool, not air blowing past it.
Not trying to pick on you! Just want to help you make this installation even better.
Excellent points.
”A puller IS more effective than a pusher by nature, ’tis true, but when they recommended it to you – were they aware that your car has the radiator behind the engine rather than in front? ”
Yes. I sent them photos & we discussed this.”I’m sure it helps this way too but reverse the direction of airflow and I promise you even better results.”
Thanks. I will give it a try.Forgive me for not letting go of this but I don’t think I was explaining my point very well. Here goes with another try (better I hope)
The water in the radiator is cooled by air rushing thru it.
When you’re stationary at, say, a traffic light – no air is naturally rushing anywhere because the car is standing still. In goes the fan. At this point it doesn’t really matter if it pulls or pushes – the only thing important is to get air thru the radiator. And therefore you’re noticing an improvement with your current setup.
If the car is moving, however, air is rushing past the engine and thru the radiator, front to back, because of wind entering thru the grille and then exiting thru the big holes in your fenders. If you turn your pulling fan on in this case, it will actually work against the speed-induced air flow; thereby making LESS air pass thru the radiator and as a consequence it will worsen your cooling.
Reverse the fan though and it will always improve airflow thru the radiator, regardless of whether the car is stationary or moving.
You say that your car is mostly overheating in city traffic and I don’t doubt that one bit. Here in Sweden though, most Saab 92 drivers mainly complain about their cars overheating when going up long steep hills (which of course is due to the engine working hard to keep up, which of course it fails at, and so wind speed drops making it even worse). Even if you haven’t encountered this just yet, a ”correctly” installed fan will help you greatly the day you suddenly find yourself in this situation.
Good luck!
/MagnusHey Magnus,
This is EXACTLY why I frequent this site – to learn!
You explanation is excellent. I will reverse the setup so it becomes a ”pusher”.
Tack,
JimThis is a thread about cooling a 96TT: http://forum.saabklubben.nu/ubbthreads.php?ubb=showflat&Number=85393&page=1
In Swedish, but google translate might help. One conclusion there is that there is more to do than adding a fan.
I found that a 282 millimeters fan helps a lot at stops and really low speeds. Over about 20km/h it doesn’t.
The fan is mounted in front of the cooler and pushes the air through it.I suspect that a fan is more of a help on a 92 though, since the 92 doesn’t even have a water pump – it’s relying on a difference in temperature to even have coolant circulation; therefore the much bigger radiator than the 96 has. In a 96 circulation isn’t the problem, it’s the smaller radiator surface area that’s the limiting factor.
- Du måste vara inloggad för att svara på detta ämne.