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7suds(at)Chartermi.net
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 Posted: Sat Mar 17, 2007 10:02 am Post subject: Cooling Question |
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All,
I am in the process of repiaring my damaged 5 and am reinstalling the
cooling system for the engine. Previous owner was using a heater core under
the instrument panel with a small fan for cabin heat. It was plumbed in
parrallel into the system with a shutoff valve ahead of the heater core,
that plumbing was plugged off when I recieved it so I conclude he was having
problems with it flowing and disconnected it from the system. The in / out
on the heater core is slightly smaller than the rest of the system and also
has a restrictor plug in one end and I suspect that was his problem, if he
opend the valve to the heater core it would not flow very well because the
fluid would take the path of least resistance across the parallel route. My
thought was to remove the restrictor plug, again plumb in parallel but put
the shut off in the parallel bypass instead of the heater core thus forcing
the coolant through the heater core, but since the heater core is smaller
dia connections I would have to limit the shut oof so I would not be able to
completley close off the bypass. That's my thinking, has anyone tried this
and had success or failure? Anyone out there running a heater core for cabin
heat? Any thoughts on how to best hook up the system?
Lloyd
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Michael Logan
Joined: 10 Jan 2006
Posts: 82
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| Posted: Sat Mar 17, 2007 2:39 pm Post subject: Re: Cooling Question |
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Try plumbing in a thermostat. Use one from a 2002 series BMW and the year is around 1975. Racepages.com has them for about $35.
G4000-39718 Wahler BMW 2002 is the part number.
If you use the bypass, which is the outlet that comes off at roughly a 45 degree angle, neck it down to your heater hose size, run this to your heater valve, heater and then to nipple on the water pump. This will give you good warm water flow through the heater.
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Mike Logan
Fredericksburg, VA |
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mclayton(at)rochester.rr.
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| Posted: Sun Mar 18, 2007 5:36 am Post subject: Cooling Question |
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Lloyd,
I've been working with a lidar system on-board our aircraft for quite
some time. Part of the system is a coolant flow loop hooked to a
chiller. We have re-discovered some basic principles of fluid
mechanics. Namely that the smaller the diameter of the coolant line,
the greater the pressure drop, and the lower the flow rate. Also,
longer line lengths will increase pressure drop. I suspect you are
correct in thinking that the smaller diameter is causing problems.
That coupled with the length the coolant has to flow through the
core, compared to the length it flows through the parallel path is
also a factor. By paying attention to the inside diameter of all
fittings, hoses and tubing, you can change the flow rates in
different parts of the system. Larger diameters=more flow. Anyone
else have any thoughts?
Mike
On Mar 17, 2007, at 3:01 PM, Cudnohufsky's wrote:
| Quote: |
<7suds(at)chartermi.net>
All,
I am in the process of repiaring my damaged 5 and am reinstalling
the cooling system for the engine. Previous owner was using a
heater core under the instrument panel with a small fan for cabin
heat. It was plumbed in parrallel into the system with a shutoff
valve ahead of the heater core, that plumbing was plugged off when
I recieved it so I conclude he was having problems with it flowing
and disconnected it from the system. The in / out on the heater
core is slightly smaller than the rest of the system and also has a
restrictor plug in one end and I suspect that was his problem, if
he opend the valve to the heater core it would not flow very well
because the fluid would take the path of least resistance across
the parallel route. My thought was to remove the restrictor plug,
again plumb in parallel but put the shut off in the parallel bypass
instead of the heater core thus forcing the coolant through the
heater core, but since the heater core is smaller dia connections I
would have to limit the shut oof so I would not be able to
completley close off the bypass. That's my thinking, has anyone
tried this and had success or failure? Anyone out there running a
heater core for cabin heat? Any thoughts on how to best hook up the
system?
Lloyd
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