 914 2.0 cooling question, Any potential downside to this proposed modification? |
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| parrish911 |
 May 18 2013, 04:14 PM
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#1
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Newbie  Group: Members Posts: 35 Joined: 27-April 06 Member No.: 5,939 Region Association: South East States  |
I have a '73 2.0 that is primarily used for auto-x with occasional weekend drives. I live in Tampa, FL. There is a copper bellows type thermostat that is used to control a flapper valve that routes cooling air. The bellows expands with heat and gradually opens the flapper valve, directing more air to the cylinders.
My question, is there any downside to bypassing the bellows and leaving the flapper valve in the always open position? I don't really deal with 'cold' weather and I am not convinced there is any benefit to having this on the engine, given how I am using the car. I would welcome your thoughts on this. Thanks, Steve |
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| Dave_Darling |
May 20 2013, 04:29 PM
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914 Idiot Group: Members Posts: 15,342 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Oh yes, they can get stuck closed! Trust me on this. If the linkage binds up, they can stick in any position, including closed.
--DD |
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| SirAndy |
May 20 2013, 05:01 PM
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#3
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Resident German Group: Admin Posts: 42,483 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Dave_Darling @ May 20 2013, 03:29 PM)  Oh yes, they can get stuck closed! Trust me on this. If the linkage binds up, they can stick in any position, including closed. Have you seen the spring on that thing? One would have to seriously go at the linkage with a BFH (IMG:style_emoticons/default/smash.gif) to get it to bind. (IMG:style_emoticons/default/shades.gif) |
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| Dave_Darling |
May 20 2013, 08:51 PM
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#4
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914 Idiot Group: Members Posts: 15,342 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(SirAndy @ May 20 2013, 04:01 PM) Have you seen the spring on that thing? One would have to seriously go at the linkage with a BFH (IMG:style_emoticons/default/smash.gif) to get it to bind. (IMG:style_emoticons/default/shades.gif) Yes, I have seen it. And no, it doesn't require a BFH to get it to bind. The spring moves the flaps to the "maximum cooling" position, the thermostat pulls them into the "warm the engine up" position. The failure mode is almost always to go to max cooling. --DD |
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| ww914 |
May 20 2013, 09:23 PM
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#5
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914 Convert Group: Members Posts: 435 Joined: 29-September 11 From: Central Coast, CA Member No.: 13,621 Region Association: Central California |
QUOTE(Dave_Darling @ May 20 2013, 07:51 PM) QUOTE(SirAndy @ May 20 2013, 04:01 PM) Have you seen the spring on that thing? One would have to seriously go at the linkage with a BFH (IMG:style_emoticons/default/smash.gif) to get it to bind. (IMG:style_emoticons/default/shades.gif) Yes, I have seen it. And no, it doesn't require a BFH to get it to bind. The spring moves the flaps to the "maximum cooling" position, the thermostat pulls them into the "warm the engine up" position. The failure mode is almost always to go to max cooling. --DD Maybe I need to do some more testing, but doesn't the thermostat get smaller when hot, thereby pulling on the cable, that pulls against the spring? Please don't make me take it apart. Just convince me I am wrong. |
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| SirAndy |
May 20 2013, 09:29 PM
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#6
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Resident German Group: Admin Posts: 42,483 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(ww914 @ May 20 2013, 08:23 PM) Just convince me I am wrong. You are wrong! That was easy ... (IMG:style_emoticons/default/biggrin.gif) |
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| ww914 |
May 20 2013, 11:08 PM
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#7
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914 Convert Group: Members Posts: 435 Joined: 29-September 11 From: Central Coast, CA Member No.: 13,621 Region Association: Central California |
QUOTE(SirAndy @ May 20 2013, 08:29 PM) QUOTE(ww914 @ May 20 2013, 08:23 PM) Just convince me I am wrong. You are wrong! That was easy ... (IMG:style_emoticons/default/biggrin.gif) Well Andy, that doesn't much convince me. It certainly makes sense that the default position would be open, but I doubt if my gauges are lying to me. Maybe somehow the spring is wired backwards, I don't know. I will check everything again tomorrow. If I am wrong, and probably are, I will report back what I find. |
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Posts in this topic
parrish911 914 2.0 cooling question May 18 2013, 04:14 PM
bandjoey I don't think it matters in hot weather. I ke... May 18 2013, 04:23 PM parrish911 Thanks Bill. I was thinking the same thing. Plu... May 18 2013, 05:54 PM nathansnathan Without the thermostat, the engine will take a lon... May 19 2013, 02:05 AM
SirAndy Without the thermostat, the engine will take a lon... May 19 2013, 11:54 AM Rand
But what do you think is the downside of running ... May 19 2013, 12:03 PM Bleyseng Leave it in as it speeds warmup as VW/Porsche had ... May 19 2013, 07:50 AM Drums66 .....Modus Operandi! :idea:
:wavebye: May 19 2013, 11:48 AM Rand Yes, as said, it means slower warmup. Would you re... May 19 2013, 11:51 AM parrish911 Wow, thanks for all the responses. I will try to... May 19 2013, 03:19 PM Dave_Darling The thermostat is present in all 914-4 engines as ... May 19 2013, 04:16 PM Cap'n Krusty The failure mode of the thermostat would be in the... May 19 2013, 04:40 PM ww914
The failure mode of the thermostat would be in th... May 20 2013, 05:17 PM Elliot Cannon My thermostat/bellows have been removed since the ... May 19 2013, 05:07 PM mrholland2 My engine installing mechanic installed the flaps ... May 19 2013, 07:43 PM SirAndy The concern wasn't the thermostat as much as i... May 20 2013, 12:11 AM bandjoey My daily drive is 30 miles each way. I don't h... May 19 2013, 10:13 PM SirAndy [quote name='SirAndy' post='1867067' date='May 20 ... May 20 2013, 11:24 PM ww914 Well, crow isn't so bad. Thanks Andy for findi... May 21 2013, 07:57 AM stugray I am putting the shrouds on my race engine.
I had ... May 26 2013, 01:12 PM Rand
I am putting the shrouds on my race engine.
I had... May 26 2013, 07:36 PM Drums66
After reading this I guess that on an engine wi... May 26 2013, 07:54 PM SirAndy After reading this I guess that on an engine with ... May 26 2013, 09:55 PM Alapone Sorry I have nothing to add on the topic just more... Jun 18 2013, 11:05 AM nathansnathan
Sorry I have nothing to add on the topic just mor... Jun 18 2013, 11:49 AM Alapone Nathan, thanks for the response. Maybe i am wrong ... Jun 18 2013, 01:42 PM Racer Chris What you describe during engine warmup is not unus... Jun 19 2013, 04:55 AM Alapone
What you describe during engine warmup is not unu... Jun 19 2013, 07:35 AM Racer Chris
Hey RacerChris thanks for the help here. Do you t... Jun 19 2013, 08:03 AM |
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