Quoting: art b
surely running fans slower will reduce the cooling..
does it need 2 fans ,
can they be wired to come on separately on thermostats [stats that fit in the pipework]
so one can kick in,later and for for less time than the other ?
Yes, you're right on all of that.
I'm looking to see if I can do a low/high setup, by running them in series/parallel. Initially it would be low triggered by the temp sensor, with high being an optional manual override. If I think it's worth spending some more, I may get a 2nd, higher value temp sensor to auto trigger the high mode.
I just wanted to know what the draw implications would be when running the fans in series.
Quoting: Roadkill
What size (diameter) are the fans ?
Pass. It's the fan setup that was originally cooling your LT1 (http://www.mkb.cc/forum/smileys/wink.gif)
It's a 4th gen dual fan, complete with original shroud.
AFAIK, originally it worked from the PCM which would fire up one based on water temp and the other if AC was on or it got really hot.
I could wire them individually, but I'd prefer both on at the same time.
BTW, 2 on full (in parallel) certainly works well. (http://www.mkb.cc/forum/smileys/up.gif)
Quoting: Titsy
Does it not run a bit cold with two fans on?
Only if you leave them on (http://www.mkb.cc/forum/smileys/dontknow.gif)
Quoting: Titsy
Serial connection is a no go. You will only have 6 to 7v across each fan.
I got this idea from the 3rd gen forum, where they've talked about doing this with the LT1/LS1 fans, with some people that have done it. What's wrong with 6-7V at the fan?
Quoting: Titsy
I'd get a dual fan thermostatic controller...
Budget=£0. I can work with what I've got which is wires and relays. (Plus a temp sensor or 2).
Quoting: Titsy
You should need a fan at all for normal running and it should only need to kick in for sat in traffic, mega hot day, or with aircon (which I'm guessing isn't fitted)..
Correct. Currently it's setup in parallel, with both kicking in/out based on the temp sensor in the head. Works pretty well (or it did when the car was driveable (http://www.mkb.cc/forum/smileys/tongue.gif)) There is also a manual override switch.
Quoting: Andy
Series setup is also a no go from the point of view that if you lose one, you lose both, having them wires in parallel at least gives you some reassurance you're not about to lose all your cooling.
Understood, but that's where the manual over-ride kicks in. The relay setup is set to switch between serial and parallel.
Quoting: Andy
That said, if you've stuck modern fans in an old car, maybe it is time to modernise the electric too. I would imagine a 2nd gen was designed to have an engine driven fan not an electric one, so using the rule of diversity, maybe the system just can't cope with what you're expecting of it?
Agree/disagree. There is a reasonable system and it works OK, I'm just looking for improvements.
Quoting: Titsy
If the car needs two fans then really the alternator should be upgraded to cope.
Fair comment. I don't know that it needs both, it's just I've always run them that way. I guess I need to do some testing when it's all back together.
I do have a 140 Amp Powermaster that gave up the ghost, and a rebuild kit in the garage somewhere. Been there for about 4 years now! I think I should dig it out and sort it. That said, I seem to remember the output at idle (i.e. when I'm stuck in traffic and temps are rising!) is quite low, and needs a bit of revs to perform more to it's potential.