on valences and vapor lock, a downside to originality |
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914/4: 70 71 72 73 74 75 76 914/6: 70 71 72
on valences and vapor lock, a downside to originality |
1970 Neun vierzehn |
Jul 1 2012, 01:05 PM
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#1
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Advanced Member Group: Members Posts: 3,199 Joined: 16-March 06 From: cincinnati, ohio Member No.: 5,727 |
For thirty-one years I had run my 70/4 w/o a rear valence panel of any kind (see 3rd photo). After prolonged driving in hot weather or hard driving in warm weather (ie autocross), the car was afflicted with vapor lock (fuel pump in original location).
Keeping the gas tank mostly full helped alleviate the problem. Now, since the OEM "deep" valence is in place (see 1st and 2nd photos), just a moderate run of 12 miles in warm temps causes vapor lock problems with an almost full tank of fresh gas. We all know that the factory installed a shorter valence later in the 914s' model run. One reason typically cited is the panels' tendency to collect debris and snow(!), but another less emphasized reason was no doubt the increase in engine compartment/rear trunk/under car temperatures. The shortened rear valence and repositioned fuel pump no doubt greatly reduced the vapor lock problems but early 914/4s are still seriously afflicted if configured as originally built. Attached thumbnail(s) Attached image(s) |
Pat Garvey |
Jul 5 2012, 04:57 PM
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#2
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Do I or don't I...........? Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States |
I think there's an easier fix here if you want to stay OEM and have an early four.
Run the snowplow in cooler weather, and replace it with the later version in hot weather. The replacement version (short) is a factory authorized replacement, since the "plow" was deleted. Seriously doubt that many judges would fault the replacement, except at a Parade concours. Most contemporary judges would allow the short version, much like the replacement battery cover. It's quick & easy to change them. Pat |
Jasfsmith |
Jul 6 2012, 08:35 AM
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#3
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Senior Member Group: Members Posts: 556 Joined: 4-October 04 From: Bangor, ME Member No.: 2,882 Region Association: North East States |
I think there's an easier fix here if you want to stay OEM and have an early four. Run the snowplow in cooler weather, and replace it with the later version in hot weather. The replacement version (short) is a factory authorized replacement, since the "plow" was deleted. Seriously doubt that many judges would fault the replacement, except at a Parade concours. Most contemporary judges would allow the short version, much like the replacement battery cover. It's quick & easy to change them. Pat Try me. I'll nick you faster than it takes to get your car on the road. <grin> My '70 914-4 rarely vapor locked (more promblems with stcking starter solenoid). Only time I had problems were after DE/time trial runs. My solution (dumb luck perhaps) was to wire the fuel pump with a switch power source to keep it running after a hard/hot drive. I've long since removed the wiring and have never had a problem since. Then again I don't do track events anymore. |
Pat Garvey |
Jul 15 2012, 06:34 PM
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#4
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Do I or don't I...........? Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States |
I think there's an easier fix here if you want to stay OEM and have an early four. Run the snowplow in cooler weather, and replace it with the later version in hot weather. The replacement version (short) is a factory authorized replacement, since the "plow" was deleted. Seriously doubt that many judges would fault the replacement, except at a Parade concours. Most contemporary judges would allow the short version, much like the replacement battery cover. It's quick & easy to change them. Pat Try me. I'll nick you faster than it takes to get your car on the road. <grin> My '70 914-4 rarely vapor locked (more promblems with stcking starter solenoid). Only time I had problems were after DE/time trial runs. My solution (dumb luck perhaps) was to wire the fuel pump with a switch power source to keep it running after a hard/hot drive. I've long since removed the wiring and have never had a problem since. Then again I don't do track events anymore. Interesting. So how would you deal with fact that the short valance was an authorized factory replacement? Similar, but not the same as the cobbled up Audi battery cover as an authorized/mandatory replacement for the splat cover & modified bungee cord early model batter cover. I'd have tp take issue with this. |
Cap'n Krusty |
Jul 27 2012, 08:47 AM
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#5
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
I think there's an easier fix here if you want to stay OEM and have an early four. Run the snowplow in cooler weather, and replace it with the later version in hot weather. The replacement version (short) is a factory authorized replacement, since the "plow" was deleted. Seriously doubt that many judges would fault the replacement, except at a Parade concours. Most contemporary judges would allow the short version, much like the replacement battery cover. It's quick & easy to change them. Pat Try me. I'll nick you faster than it takes to get your car on the road. <grin> My '70 914-4 rarely vapor locked (more promblems with stcking starter solenoid). Only time I had problems were after DE/time trial runs. My solution (dumb luck perhaps) was to wire the fuel pump with a switch power source to keep it running after a hard/hot drive. I've long since removed the wiring and have never had a problem since. Then again I don't do track events anymore. Interesting. So how would you deal with fact that the short valance was an authorized factory replacement? Similar, but not the same as the cobbled up Audi battery cover as an authorized/mandatory replacement for the splat cover & modified bungee cord early model batter cover. I'd have tp take issue with this. Audis of the era didn't have a battery cover, other than the back seat cushion .................... The Cap'n |
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