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> Model Specific Information

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
post Jul 1 2012, 01:05 PM
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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.


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Pat Garvey
post Jul 5 2012, 04:57 PM
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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
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Jasfsmith
post Jul 6 2012, 08:35 AM
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QUOTE(Pat Garvey @ Jul 5 2012, 06:57 PM) *

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.
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