Vacuum Bottle

[RollinWOT]

I didn't know exactly where to pout this thread, but here goes. I know that adding a vacuum bottle after the throttle body on a carb'd vehicle helps relieve bogging down but what about on an EFI vehicle? Has anybody, carb'd or not even done a vacuum bottle mod to their truck?

 

[Big Jim M]

What???

I didn't know exactly where to pout this thread, but here goes. I know that adding a vacuum bottle after the throttle body on a carb'd vehicle helps relieve bogging down but what about on an EFI vehicle? Has anybody, carb'd or not even done a vacuum bottle mod to their truck?

A vac supply is needed for certain vehicle parts EXCEPT the engine! There could be no possible use for a vac container attached to the engine.

Some 4 wheel drives require a vac container. Some headlight doors, heater/A-C and windshield wipers do also. But no part of the engine can be HELPED by having a vac supply. The parts that SEE the vac on an engine require to have the ACTUAL vacuum to work correctly.
Big JIm

 

[rangerluver]

Right, because is it not the engine that creates the vacuum that all the other accessories use? So, if the engine used the vacuum it produces, it would be looping the vacuum that it is using. Doesn't seem to make much sense; To me, anyway.

 

[Big Jim M]

Perhaps

Right, because is it not the engine that creates the vacuum that all the other accessories use? So, if the engine used the vacuum it produces, it would be looping the vacuum that it is using. Doesn't seem to make much sense; To me, anyway.

Maybe I can help ya luver. All engines have SOMETHING that reads the vacuum. as the vac drops or raises the engine responds in kind to that level of vac.
Having a cannistor connected to the engine vac would KEEP the engine operating as if it was running straight and level.. There would be lots of clattering and other bad things would happen.

The vehicles that DO HAVE a canniser for heating doors, 4x4 or other needs have a ONE WAY VALVE in the vac line to the cannistor to keep the engine vac at normal up and down vac levels.

The original question was such as one gets from a back-yard engineer. Anyone that actually did this would quickly UNDO it.
Big JIm

 

[RollinWOT]

Ok, because I know from expreience that older VWs with the 4 cylinder boxer engine bogs down real bad and having a vacuum bottle below the throttle plate keeps a bit of extra air inside and when the car struglles to get aup a hill it sucks up that extra bit of air in the bottle to stop it from hesitating. I was just wondering to see if this could be done to an efi and carb's cars.

 

[Big Jim M]

What?

Ok, because I know from expreience that older VWs with the 4 cylinder boxer engine bogs down real bad and having a vacuum bottle below the throttle plate keeps a bit of extra air inside and when the car struglles to get aup a hill it sucks up that extra bit of air in the bottle to stop it from hesitating. I was just wondering to see if this could be done to an efi and carb's cars.

Sorry rollin but you have your facts confused or the facts wrong. What you describe above simply cannot happen.

If there IS a bottle on that engine it IS NOT to be used by the engine! Most likely on an old VW it was for the windshield wipers to use in times of low vacuum.

Adding air to an already BOGGING engine would only make the bogging worse.

Big JIm

 

[RollinWOT]

Damn hippies always telling you junk. Seems like when I tried it on my VW it stopped it from bogging down. Head up a hill in a stock VW and it bogs down but head up a hill with a VW and a vacuum bottle under the throttle plate and it zipped right up. Must be one of those things that you don't question: it just works. Hippies on 4th avenue have been known to give either really good or realy bad advice. Figured I'd give it a shot and it worked. I thought the same thing you did, that it would only make things worse, but it works on Vee-dubs I guess.