How much cooling is gained with the GT double grill?, Other ideas for cooling outside of an addtional cooler? |
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How much cooling is gained with the GT double grill?, Other ideas for cooling outside of an addtional cooler? |
peteinjp |
Mar 7 2023, 06:45 PM
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#1
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Member Group: Members Posts: 201 Joined: 15-July 21 From: Japan Member No.: 25,723 Region Association: None |
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 |
mepstein |
Mar 7 2023, 06:51 PM
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#2
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914-6 GT in waiting Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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 |
Mar 7 2023, 06:56 PM
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#3
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
These (this concept) may help
Attached thumbnail(s) |
NARP74 |
Mar 7 2023, 07:04 PM
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#4
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Senior Member Group: Members Posts: 1,073 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
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 |
Mar 7 2023, 07:16 PM
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#5
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Member Group: Members Posts: 201 Joined: 15-July 21 From: Japan Member No.: 25,723 Region Association: None |
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 |
BillJ |
Mar 7 2023, 07:24 PM
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#6
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Senior Member Group: Members Posts: 1,111 Joined: 4-March 13 From: charlotte, NC Member No.: 15,610 Region Association: None |
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nditiz1 |
Mar 7 2023, 07:25 PM
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#7
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
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 |
Mar 7 2023, 07:46 PM
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#8
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Well, it is an oil cooled car
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mepstein |
Mar 7 2023, 08:26 PM
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#9
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914-6 GT in waiting Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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. |
Superhawk996 |
Mar 7 2023, 08:29 PM
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#10
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914 Guru Group: Members Posts: 5,903 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
What oil temp would make you happy?
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altitude411 |
Mar 7 2023, 08:48 PM
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#11
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I drove my 6 into a tree Group: Members Posts: 1,306 Joined: 21-September 14 From: montana Member No.: 17,932 Region Association: Rocky Mountains |
what are you running for your front valance?
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peteinjp |
Mar 7 2023, 09:40 PM
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#12
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Member Group: Members Posts: 201 Joined: 15-July 21 From: Japan Member No.: 25,723 Region Association: None |
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. 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 |
mepstein |
Mar 7 2023, 09:43 PM
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#13
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914-6 GT in waiting Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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 |
Mar 7 2023, 10:21 PM
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#14
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Member Group: Members Posts: 76 Joined: 23-February 21 From: Oceanside, Ca Member No.: 25,250 Region Association: Southern California |
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 |
Mar 7 2023, 10:26 PM
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#15
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Member Group: Members Posts: 201 Joined: 15-July 21 From: Japan Member No.: 25,723 Region Association: None |
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 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 |
mb911 |
Mar 8 2023, 06:12 AM
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#16
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914 Guru Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
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 |
Mar 8 2023, 07:06 AM
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#17
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
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. |
Superhawk996 |
Mar 8 2023, 07:30 AM
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#18
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914 Guru Group: Members Posts: 5,903 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
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? |
nditiz1 |
Mar 8 2023, 07:45 AM
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#19
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
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GregAmy |
Mar 8 2023, 07:56 AM
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#20
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
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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