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Dashpot?
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moelawe
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Joined: August 15, 2013
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PostPosted: Wed Aug 21, 2013 12:55 pm    Post subject: Dashpot? Reply with quote

Our '73 has dual carbs but seems to be missing the dashpot. What is a dashpot and how important is it? Seems to run fine without it.

Thanks
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guitarman63mm
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Joined: September 03, 2008
Posts: 795
Location: New York City
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PostPosted: Wed Aug 21, 2013 12:59 pm    Post subject: Reply with quote

Welcome to the forum!

Randy in Maine wrote:
I stole this from someplace on the "interweb"...

The function of the vacuum throttle control or vacuum dashpot is:

1. To prevent stalling, when the throttle is suddenly closed. It insures a gradual or slow closing which permits the continuing air supply to lean out the rich mixture of fuel that occurs on sudden throttle closing.

2. It works with emission control. During coasting it holds the throttle plate open slightly.

3. It acts as an idle speed stabilizer when the engine is under load at idle. The plunger extends as the vacuum falls due to the load. This causes the throttles to be opened slightly.

Problems

If the dashpot or vacuum control is incorrectly adjusted the driver will experience:

1. Braking problems, if the throttle is held open too long.

2. Stalling.

Making some nice progress there!

_________________
Jimmy

- 1974 Safaré Custom Camper. 091 trans + Dual Weber 34 ICTs + Pertronix SVDA + 1.7L 914 T4 engine.
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moelawe
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PostPosted: Wed Aug 21, 2013 1:04 pm    Post subject: Reply with quote

Thanks for the welcome and thanks for the advice. That would explain some issues I was assuming were related to a vacuum leak.

Thanks again
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SGKent Premium Member
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Joined: October 30, 2007
Posts: 34130
Location: Citrus Heights CA - NorCal
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PostPosted: Wed Aug 21, 2013 1:50 pm    Post subject: Reply with quote

in a nutshell it is a device with a diaphragm that slows the throttle closing for a couple of seconds when you let off the gas. This keeps the mixture from richening too much which if it does can cause stalling and backfiring. People take that kind of stuff off because they don't understand how they operate.

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