 Flat fan for T4 engine |
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| mepstein |
 Feb 10 2026, 07:03 PM
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#1
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914-6 GT in waiting  Group: Members Posts: 20,420 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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| worn |
Feb 10 2026, 07:05 PM
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#2
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,544 Joined: 3-June 11 From: Madison, WI and North Bend WA Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(mepstein @ Feb 10 2026, 05:03 PM)  I liked how they hid the belt and idlers. I also suppose that one can calculate air movement needed and delivered. Sweet. |
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| TRP |
Feb 10 2026, 07:12 PM
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#3
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Member Group: Members Posts: 204 Joined: 2-September 23 From: Morgan Hill, CA Member No.: 27,559 Region Association: None
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Don't imagine that would fit under a LJet/DJet set up. You carb guys have all the fun.
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| mepstein |
Feb 10 2026, 07:17 PM
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#4
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914-6 GT in waiting Group: Members Posts: 20,420 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(TRP @ Feb 10 2026, 08:12 PM) Don't imagine that would fit under a LJet/DJet set up. You carb guys have all the fun. I was thinking it would be cool with ITB's and EFI. |
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| worn |
Feb 10 2026, 08:09 PM
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#5
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,544 Joined: 3-June 11 From: Madison, WI and North Bend WA Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(mepstein @ Feb 10 2026, 05:17 PM) QUOTE(TRP @ Feb 10 2026, 08:12 PM) Don't imagine that would fit under a LJet/DJet set up. You carb guys have all the fun. I was thinking it would be cool with ITB's and EFI. (IMG:style_emoticons/default/agree.gif) Me too. Not that I plan to spend that on my four. |
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| Jack Standz |
Feb 10 2026, 09:32 PM
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#6
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Senior Member Group: Members Posts: 704 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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Type IV flat fan
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| TRP |
Feb 10 2026, 09:38 PM
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#7
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Member Group: Members Posts: 204 Joined: 2-September 23 From: Morgan Hill, CA Member No.: 27,559 Region Association: None
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This one looks like a Corvair.
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| Superhawk996 |
Feb 10 2026, 09:43 PM
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#8
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914 Guru Group: Members Posts: 7,668 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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I must be missing something. The T4 was an improvement over the T1 engine by having the fan driven directly off the crank and eliminating the possibility of fan loss due to a broken belt.
Lose the electrical fans due to some sort of electrical issue or temp sensor issue and you just bought a new motor (IMG:style_emoticons/default/confused24.gif) Sure it frees up maybe 5hp by removing fan parasitic loss but at the expense of losing an engine, no thanks. Surely it has a place within a T4 conversion on a Bug, Ghia, etc but I’m not seeing an advantage within a 914 other than just being different for the sake of being different. |
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| Montreal914 |
Feb 10 2026, 10:00 PM
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#9
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Advanced Member Group: Members Posts: 2,026 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Yes, it has always been the issue with the electric fans. Nevertheless, not the first one to play with that concept.
Maybe it provides better cooling distribution (cyl 3) and more cooling overall? (IMG:style_emoticons/default/confused24.gif) This racecar at Rennsport V was setup with two dual outlet fans in the cabin with two ducts each going to the engine tins in redundancy. At least if one fan goes, one is still pushing air. Unfortunately I wasn't able to picture the engine bay but the standard engine fan wasn't there, just the ducts. (IMG:style_emoticons/default/driving.gif)   |
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| emerygt350 |
Feb 10 2026, 10:01 PM
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#10
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Advanced Member Group: Members Posts: 3,457 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
That's just what I was thinking. If the engine is spinning the fan is moving.
I would have to suspect the physics also don't work out for the dual electrics but I can't do the math. Again, I will defer to those with the thermodynamics chops or the vw Porsche engineers. It definitely looks cool though. |
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| emerygt350 |
Feb 10 2026, 10:03 PM
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#11
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Advanced Member Group: Members Posts: 3,457 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Reminds us of the real value of the generator light on nontype4s
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