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Offline myproject

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vacuum leak from OLD hoses on my 2.3 Bobcat
« on: July 08, 2020, 11:12:39 PM »
what of many hoses can I get rid of  on my 1979 2.3 Bobcat ? there are SO many . the Air pump is gone with the hoses. However there are so many more. I'm looking for info on what I need to just have it run so I can move it to work locations, body shops, muffler shops, engine

Offline rob289c

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Re: vacuum leak from OLD hoses on my 2.3 Bobcat
« Reply #1 on: July 09, 2020, 06:12:08 AM »
Not to hijack, but I will also be interested in this thread.  Now that mine will start and run, I want to clean up and eliminate any components That aren't necessary.  Is it feasible to get down to only the vacuum advance, tranny vacuum modulator, and power brakes if equipped?  Mine has a large diameter hose, like a heater hose coming from a port on the exhaust manifold.  Did it used to go to a no longer present air pump?  Anyway, sorry to jump on this but I have the same interest as MyProject...

Rob
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Offline Wittsend

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Re: vacuum leak from OLD hoses on my 2.3 Bobcat
« Reply #2 on: July 09, 2020, 12:02:44 PM »
It gets somewhat tricky to decide what can go or stay. If you have smog checks it might be wise to remove nothing. Here in California every car 1976 and newer is expected to have EVERY smog device in place and functional. If not you fail even if the tail pipe test is clean enough. They test here every two years.


Some devices, other than under the hood clutter have little affect on performance. Retarded ignition, retarded cam timing and lower compression were a significant cause of lower power.


EGR was (to me) a cheap way of lowering NOX. Not the best analogy but bit like making one re-breath their expelled air breath to make them less able to exert themselves..., so they would use less oxygen. EGR reduces NOX by affecting the cylinder burn to lower temperatures - which lowers NOX. I believe this occurred because there was reduced oxygen in the cylinder burn process. Oddly (to me) the air injection pump was intended to put oxygen back into the burned mixture in the exhaust system to assist in burning hydrocarbons.


So basically they took oxygen out to reduce NOX in the cylinder and put it back in the exhaust to reduce hydrocarbons.  Both reduced power and mileage.


The vapor recovery should not affect performance. When I was young I hated all smog devices. But as I am now older I am of a different opinion. On a hot, stagnant day I can hardly walk around a car show and not be bothered by the vapors of evaporating 'open to the air' float bowls.


Some carbs have heat affected air bleeds (often attached to the air cleaner) to adjust idle.


It may be that you just have to remove them one at a time and see what happens. Make sure to cap both ends of any hose removal.

Offline rob289c

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Re: vacuum leak from OLD hoses on my 2.3 Bobcat
« Reply #3 on: July 10, 2020, 07:19:56 PM »
I like the idea of disconnecting and plugging/capping both ends to see what the effect is.  There are some very small diameter vac lines that I don't know what they are for.  Any guidance on them?  What are the (I will call the check valves) in the vacuum advance hose?  One is close to the distributor and the other is at the other end.  My old Mustang is a plain old vac hose. 
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Offline Wittsend

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Re: vacuum leak from OLD hoses on my 2.3 Bobcat
« Reply #4 on: July 10, 2020, 07:34:16 PM »
Likely others would be better to assist in this carburetor situation. My comments were more of a generic position. My Pinto has a '88 Turbo Coupe engine with Fuel Injection. Sorry. Do you have a manual? Often they have pages that define the hose and its function.