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> How much cooling is gained with the GT double grill?, Other ideas for cooling outside of an addtional cooler?
peteinjp
post Mar 7 2023, 06:45 PM
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My 2.7 get up to about 230F in the summers and I'm looking to try everything possible to keep the temps down a bit. I am planning on installing a front cooler but that is more of a project that I can handle in the short term.

So does the GT style double grill actually help cooling significantly? Any other mods that can increase cooling- different fan or pully etc?

230 seems to be a high but acceptable limit but sure would like to have a little more wiggle room.

Other weeks- will check the timing to ne sure its spot on. Also will try going back to the initial rich mix on the MFI.

Pete
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mepstein
post Mar 7 2023, 06:51 PM
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It’s easy to check. Go for a drive, get it hot, check temps, remove the lid, drive some more and check temps. The lid removes in 5 minutes.
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r_towle
post Mar 7 2023, 06:56 PM
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These (this concept) may help



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NARP74
post Mar 7 2023, 07:04 PM
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Do you have floor pan air deflectors installed? Mine did not make it back on the car after reassembly by the PO. I bought a set and installed them. Looking to see what gains I get in cooling if any this summer.
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peteinjp
post Mar 7 2023, 07:16 PM
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Good point on just removing the lid. In fact now that I think about it I've already done that when I was tuning the MFI and I think it made no difference.... I'll try again.

Love the louvers!

Yes I have the lower deflectors installed.

Pete
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BillJ
post Mar 7 2023, 07:24 PM
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QUOTE(r_towle @ Mar 7 2023, 07:56 PM) *

These (this concept) may help

Off topic but damn that is gorgeous silky blue paint with sexy curves.
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nditiz1
post Mar 7 2023, 07:25 PM
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I have a 2.4 installed with carbs (now PMO). In the hot summer or even on an extended highway drive she'll creep up to 230. I don't like it that hot either which is why I'm mounting a front oil cooler, hopefully soon. I have a GT grill and the flaps. I have tried everything to keep it cool on its own, but it's the nature of the 6 in a 914.
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r_towle
post Mar 7 2023, 07:46 PM
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Well, it is an oil cooled car
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mepstein
post Mar 7 2023, 08:26 PM
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If you have an engine sound pad, make sure it’s not obstructing the flow in front of the engine fan.

Love the blue color on that car.
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Superhawk996
post Mar 7 2023, 08:29 PM
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What oil temp would make you happy?
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altitude411
post Mar 7 2023, 08:48 PM
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what are you running for your front valance?
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peteinjp
post Mar 7 2023, 09:40 PM
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QUOTE(Superhawk996 @ Mar 8 2023, 11:29 AM) *

What oil temp would make you happy?


This is a good question. Not really sure how hot is too hot. What’s the general consensus on this? Searching around there are lots of opinions… but generally its said that high temp = shorter engine life.


QUOTE(altitude411 @ Mar 8 2023, 11:48 AM) *

what are you running for your front valance?


Stock valence

Kinda thinking of running a finned tube in the rocker panel until I can go all the way with a front cooler and making the rocker cover louvered for some air flow. That may even be enough to get temps down.

Pete
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mepstein
post Mar 7 2023, 09:43 PM
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Perry/ironhillrestorations has a good thread about an oil cooler mounted in the rear quarter. Mirror image to the oil tank. It might be enough to make an appreciable difference.
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Nate W
post Mar 7 2023, 10:21 PM
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If your 2.7 has the earlier pulleys like mine (116 crank ,95 fan pulley) you could change to 80-89 set up (127 crank, 83 fan). I was reading that the ratio is 1.67 to 1 instead of 1.3 to one which seemed to give about 9 percent more airflow (1500 vs 1380 CFM). I’m thinking about doing this to my 2.7 which I haven’t installed so I have no temp data. Roth sport has the pulleys in all the sizes.
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peteinjp
post Mar 7 2023, 10:26 PM
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QUOTE(mepstein @ Mar 8 2023, 12:43 PM) *

Perry/ironhillrestorations has a good thread about an oil cooler mounted in the rear quarter. Mirror image to the oil tank. It might be enough to make an appreciable difference.


That is an awesome thread- but getting it down with the fender on and the engine might be a serious challenge. On the other hand working up a loop cooler for that location seems do-able...

Perry's install


QUOTE(Nate W @ Mar 8 2023, 01:21 PM) *

If your 2.7 has the earlier pulleys like mine (116 crank ,95 fan pulley) you could change to 80-89 set up (127 crank, 83 fan). I was reading that the ratio is 1.67 to 1 instead of 1.3 to one which seemed to give about 9 percent more airflow (1500 vs 1380 CFM). I’m thinking about doing this to my 2.7 which I haven’t installed so I have no temp data. Roth sport has the pulleys in all the sizes.


Good to know. the engine was actually built by rothsport and I'm planning on contacting them with some other questions so I'll ask about this as well.

Pete
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mb911
post Mar 8 2023, 06:12 AM
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How the engine mount is installed and how well the seals mate up has a huge effect on cooling. That is why I suggest not using the PMS or naroscpae mounts as they mount the engines lower in the car per instruction and the pushes the fan to close to the firewall and does not seal well as they sit about 3/4” to low in the chassis
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nditiz1
post Mar 8 2023, 07:06 AM
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QUOTE(Superhawk996 @ Mar 7 2023, 07:29 PM) *

What oil temp would make you happy?

My personal preference is 210. Whether 100f out or 80f. Cruising for hours on the highway at ~80 mph.

Heading to the NEG3 last year, I could actually raise or lower my temp by how fast I went on the highway 65-70 mph kept the temp ~210.
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Superhawk996
post Mar 8 2023, 07:30 AM
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Look at the oil temp gauges which vary from early to late. Knowing that standard design practices is to have a gauge run near mid scale. Also know that the 914 oil temp gauge was rescaled in 1974 because Americans aren’t familiar with the operation of air cooled / oil cooled engines and the fact that they run hotter oil temps than water cooled engines.

Where did Porsche expect oil temps to run?
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nditiz1
post Mar 8 2023, 07:45 AM
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I know you posted this question and pic before.

The 911 runs at 210 all day long. The mark on the 77 gauge is directly in the middle. The 914 is using a GT style gauge with 100C (212F) in the middle.

210 seems right to me

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GregAmy
post Mar 8 2023, 07:56 AM
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To the original question...I sincerely doubt the single-grill lid creates any significant restriction to cooling airflow on a street car. On an always-7000-revving engine? Sure. But I do doubt that on a street car.

That said, I did Sergio's GT lid conversion on both my 4-banger street car and my 4-banger 2056cc race car*. The former because it looks good and the latter because...well, I looks good and is lighter and my race car lid is pinned and gets removed for service... - GA

*I also removed/trimmed all the external horizontal sheet metal on the race car, to improve airflow and access/serviceability.
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