[Cloud9...68]

Well, I just heard from my second prospect for "borrowing" an underbody pan to see how much impact it has on my cooling, but his car doesn't have it either, so I'm out of luck in terms of my ability to check the impact of the pans on my car's cooling anytime soon. I realize I do need to get my hands on one, though, as it can only help.



I'm surprised at how many 968s have all three pans. I had expected a lot more with one pan, and only a few with all three. Also, a number of people stated they only had the front apron, but apparently didn't vote in the poll, plus the two local 968 owners I know both had only their front apron, so there are a fair number running around with no pans, but not as many as I had expected, assuming this poll's sample is representative of the population of 968s.

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[tamathumper]

The pan isn't anything special - several people have mocked them up on 944s in the past. If you just want to do a test, I would think you could mock something up with some bolts and a Flying Carpet.



Oh wait, you're in Austin... well, you'll just have to Google what a "Flying Carpet" is <img src="/forum/images/smilies/968/biggrin.png" class="smilie" alt="" />



Here's one on eBay http://www.ebay.com/...w-/360508667532

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[Bulti]

My car never has any cooling issues whatever the weather conditions, the temp gauge will never go higher than the 9 o'clock position, then the fans would switch on and do their job.



In my opinion, the underpans' sole purpose is to create less drag and a ground-effect. They have no or little influence on the engine's running temperature.



Btw, my '92 car has only the middle plastic one. Apparently their should be a second, batwing (front apron)-like one on the front bumper? The previous owner messed up the front and I suspect he didn't fix everything the way it should.

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[Cloud9...68]

[quote name='tamathumper' timestamp='1376077912' post='146936']

The pan isn't anything special - several people have mocked them up on 944s in the past. If you just want to do a test, I would think you could mock something up with some bolts and a Flying Carpet.



Oh wait, you're in Austin... well, you'll just have to Google what a "Flying Carpet" is <img src="/forum/images/smilies/968/biggrin.png" class="smilie" alt="" />



Here's one on eBay http://www.ebay.com/...w-/360508667532

[/quote]

lol - yes, I had absolutely no idea what a Flying Carpet is. I can't even spell kold...

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[Cloud9...68]

[quote name='Bulti' timestamp='1376078846' post='146938']

My car never has any cooling issues whatever the weather conditions, the temp gauge will never go higher than the 9 o'clock position, then the fans would switch on and do their job.



In my opinion, the underpans' sole purpose is to create less drag and a ground-effect. They have no or little influence on the engine's running temperature.



Btw, my '92 car has only the middle plastic one. Apparently their should be a second, batwing (front apron) (front apron)-like one on the front bumper? The previous owner messed up the front and I suspect he didn't fix everything the way it should.

[/quote]



I could see the pans having an effect at high speed, for the reasons Flash mentions. So on a track with very long straight-aways, I could believe having the pans would help with engine cooling, along with ground-effects, as you said. It's been on my list to buy at least a center pan, but the track I drive on the most is very short and technical, so I haven't gotten around to it.

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[Qfrank]

Ok Cloud9.



91-94 degrees, high humidity today.

New thermostat, low temp fan switch, lower radiator hose, radiator cap, removal of radiator and cleaned, refilled 50-50 mix, watter wetter.



Car never ran hot prior, meaning above 9oclock. Rose as high as 10:30 lets say, couple of weeks ago.

Did above mentioned work, and finally got it out tody for a 60 mile drive. It gets driven once a month in the summer.



Full blast a/c the entire time.



In town, needle never rose past 8:30, just a smidge above first white line.



High speed cruising for 15 miles at 90mph, almost hit 9:00. 3 blasts from 80-130-80, then cruised at 75 for 5 miles, almost went past 9:00. That was it. 3 weeks ago at highway speeds it hit last white mark.



Seems a tad hotter at highway speeds, maybe due to me having only front apron. OR our temp guage is bonkers.



None the less, the repairs certainly helped keep her in check.



Hope it helps someone.

FQ

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[Cloud9...68]

Qfrank,



Interesting, and yet another example of how much the temp readings on these cars varies. I would say that in its current state, your car is possibly running slightly cooler than mine, but only slightly, if that, because it's been 8-10 degrees hotter here than where you are. My main reference point is the way my car behaved the first two years I had it, when I swear I could have replicated your tests in 105 degree heat and never see the needle go above 8 oclock. Although, I'm beginning to wonder if my memory is clouded by nostalgia, sort of like the old saying, "The older I get, the better I used to be."

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[flash]

i caution against any sort of "post hoc ergo propter hoc" thinking. get a baseline with real measurements, with all components in place, and all of them verified as functioning. i think you are on a witch hunt that will likely resolve itself when things are set right, and you get a few miles on the motor.



of course, you could have a bunk pump or blockage too.

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[astroede]

[quote name='Cloud9...68' timestamp='1376054212' post='146868']



What do you mean by the top plate over the radiator? Also, can you comment on whether adding the plastic middle pan had any impact on your observed temperature gauge reading, or did you change the pump at the same time?

[/quote]

As noted by someone prior, the top plate is a thin plastic sheet about 4" wide that clips on just above the radiator and below the air cleaner box. Mine was missing when I got the car. I did replace the water pump before finding a plate at a salvage yard. Since the addition of the missing plates, I'd say the car is running cooler and at a more stable temperature. My autocross times have not improved though...must be the driver. The metal rear bottom plate was found after an online search of salvage yards, and it did not seem to be in plentiful supply. I'd like to get mine into the hands of one of you if possible rather than finding my wife tossed it out over the winter.

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[robinlarry]

http://www.autoatlan...2-95/101-05.php



This diagram shows two of the plates and their prices. I've posted a picture of all three in the gallery.

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[Cloud9...68]

[quote name='robinlarry' timestamp='1376148075' post='146984']

http://www.autoatlan...2-95/101-05.php



This diagram shows two of the plates and their prices. I've posted a picture of all three in the gallery.

[/quote]

Thanks for the link - now I finally know what these things look like. Darryl had a middle plastic one he was going to sell me, but something must have come up, because he hasn't corresponded with me to finalize the deal in over a month.

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[flash]

very busy guy

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[Cloud9...68]

Yes, apparently so. Question - from the images, there's a gap between the two pans that leave the oil pan, and I assume the drain plug, accessible, and yet I've heard people sometime throw the pan(s) away because it makes doing an oil change an even bigger pain than it already is. Is it because the oil gushes onto the top of the pan, leaving it trapped there?

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[banditsc]

If your using the stock oil filter all the oil from the filter runs down to the pan on removal, which necessitates the pans removal for cleaning.

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[Cloud9...68]

Ah, thanks. But since I have a Canton filter, this shouldn't be a problem.

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[robinlarry]

Looks like my car did NOT come with the rear metal cover ... I positioned the new piece and saw there are no holes in the body for the rear brackets. Now the question is to drill or not to drill. Anyone have a pic of this?



Second question: There are three speed nuts and combination screws in the plastic cover. (8 & 9 in the diagram) What do these hold and are they mounted in the front or rear of the small set of openings for them?

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[vliegwielolaf1234]

[quote name='robinlarry' timestamp='1376309006' post='147073']

Looks like my car did NOT come with the rear metal cover ... I positioned the new piece and saw there are no holes in the body for the rear brackets. Now the question is to drill or not to drill. Anyone have a pic of this?



Second question: There are three speed nuts and combination screws in the plastic cover. (8 & 9 in the diagram) What do these hold and are they mounted in the front or rear of the small set of openings for them?

[/quote]





The rear metal piece should have studs attached to the frame where 2 nuts do the yob for fastening , but if no studs , i guess drilling could be an option ,

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[tamathumper]

The three speed nuts are used to fasten the metal shield to the plastic belly pan, it kind of "ties them together".

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[Larry Weinstein]

Different holes I think. These are no. 8 and 9 in the PET diagram. They are located too far forward to connect to the metal plate. There are six small square holes with accompanying round screw holes that you can see in the gallery pic I posted.



http://www.968forums.com/gallery/image/2408-panels/

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[Cloud9...68]

Thanks, but aren't the two rear pans shown in reverse order in your picture? I thought the silver one (which I assume is the metal one) is the one that sits most rearward. Excuse me if I have this wrong - my car came with just the front apron, so I have a bit of "pan envy"...

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