Deceleration vacuum? valve - Page 2 - Fuel Economy, Hypermiling, EcoModding News and Forum

dcb · 06-02-2010, 01:08 AM

If you are bent on the carb, then you might consider a large flapper valve on the manifold that pops open at high vacuum, and slams shut when you move off idle.

Driveability might take some getting used too, but it should effectively bypass the carb if it is of sufficiently less resistance than the carb throttle plate at idle position.

Heck, a solenoid on a tee fitting on a large manifold port (brake?), hooked up to a microswitch (that also kills the ignition) might be a reasonable carb kill switch setup, allowing you to dfco without sucking so much gas out of the idle circuit. So you hold the switch in and it creates a giant induction leak and kills the ignition. You are usually better off gliding than forced DFCOing thoug.

dcb · 06-02-2010, 02:16 AM

Can also have a "switched" induction leak be a preset lean burn setting.

sc2dave · 06-04-2010, 02:05 AM

Quote:

Originally Posted by bgd73

i was going to use the egr valve on my little boxer, as locally, be it pulp mills or whatver, the egr is equivalent to a chemical suicide for the car and driver..i disconnect these right away...

Also a carbed engine, japanese.. Alot of similar between the 22r function because of the year and carb paranoid unthunk weirdo engineering of the 1970s and 80s..

In injection what you are trying to do is bypass.

To make it work natural, by its own vacuum.. This needs thought. I do not have that correct... But there must be a way.

You could also add a large resonator chamber about a foot after the catalyst convertor.. This acts perfectly as a backwards air bypass, cylinders getting satisfied through their own exhaust. My own mileage lept into the 30s after making my own out of a hollowed glasspack, but keeping the steel innards.

On four cyls, about 18inch is perfect, the two foot is too big.. And only 20 bucks. Be sure packing is removed if you try it. The hollow chamber is the trick...

more meaningless comments from the ecomodder retard?!

DonR · 06-04-2010, 01:02 PM

I believe he was talking about a bypass valve to let air in after the throttle plate. This vaccum leak should stop air from traveling across the venturi & sucking fuel out the of the jets.

This could potentially cause a lean burning condition, which could be bad for your engine.

I think this can be done with a carb spacer & an electric/air solenoid. The inlet for the solenoid should be after the air filter & the exit should be plumbed into the carb spacer. When the solenoid is opened it shoul allow air to travel around the carb, which should allow for DFCO.

I read about it somewhere on the internet. Someone sells a kit/plans, cant remember, that hooks the solenoid up to all kinds of stuff including your brake light switch. All this is to automate the thing so your engine won't stall. I say just use a momentary switch & your noodle to control it.

Don