MBuhrig

Quick question...

I took out and tried to clean my WUR today... it has not been working correctly. I also cleaned my injectors and changed the o-rings. In doing so I needed to take out my electric blower motor and ducts. I live in Miami, Florida and have no reason for heating... if I leave the blower motor and ducts out is there anything I should do since allot of heat will now be blown into the engine compartment.

Thanks for any advice.
Marc

Bill Gregory

Marc,

You may want to backdate your hot air source to that of the early 70's, if for no other reason to keep the ability to defog your windows. There's an article on tech.rennlist.com under 911 engines that details how to do this.

MBuhrig

Thanks Bill I will check that out right away.
Marc

Clinton R Hodges II

For me the backdate was the way to go. I only use my car on sunny days, which by the way are few and far in-between. I utilized a tech article offered by Bill Gregory relative to backdating the fresh air source for the CIS based 911. Life is much simpler now that the electric motor is gone and no longer clogging up the engine compartment.

I would imagine that by removing the electric fan the engine compartment is cooler. Also, one might pass-up backdating the right side air duct which would force more air over the top of the engine. I don't know that Porsche intended the latter and I would definitely cross check this prior to experimentation.

Good luck and keep us posted.
Clinton R Hodges II
Anchorage, AK

pbs911

I just removed mine this weekend and plan on the backdating. In the mean time I blocked off the outlet on the fan to heater blower motor and the outlet in the passanger side engine sheet metal. The former is essesntial to prevent the air that would be forced over the motor into the engine compartment.

As Clinton sujested, only doing the left side of the motor sounds like a good idea, if not for the sake of more air over the engine, but for the $$$ savings. The right side pice of tin and plastic is listed at $150? And I can't find one used.

It is really amazing how much engine compartment is freed up with the blower motor removed.

MBuhrig

Thanks everyone... look like another weekend will be gone experimenting. I would rather not back date it if I can do without and I will not miss having to remove the blower and ducts every time I want to work on something. <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

pbs911, one question though ... I need to research this more (make sure no harm will come to anything) but can you explain a little more which outlets you blocked of and how you did it. I know there is the one coming from the cooling fan housing which went to the blower, one on the left side of the engine pan that also was connected to the blower and one an the right side of the pan under my A/C compressor.

Thanks again for any input,
Marc

pbs911

[quote]
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can you explain a little more which outlets you blocked of and how you did it. I know there is the one coming from the cooling fan housing which went to the blower, one on the left side of the engine pan that also was connected to the blower and one an the right side of the pan under my A/C compressor.
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I blocked off each of these areas. Since the motor is air cooled I didn't want any air to go where it was not designed.

I also looked at the issue as to whether it is ok to backdate the 3.0 using air from the fan on both sides of the fan housing. Originally, the right side is blocked off and the air for the heater is taken from the left side.

Well if you look at the 78 3.0 turbo, it does not use the heater blower motor and uses the earlier system described above. I would think that no harm would come to the 3.0 NA if the 3.0 turbo used the same set up.

MBuhrig

Great thanks for the input!
Marc
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />