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Subject:
Re: vacuum hose to advance question

From: "Joe M" <txjoe59(at)yahoo.com>

Subject: Re: vacuum hose to advance question

Date: Sat, 26 Jun 2004 01:32:07 -0500

Lines: 25

________________________________________________









A "port that sucks when gas applied" is known as ported vacuum.

It was used as an emissions feature to retard advance at idle (it made

hotter exhaust and thus lower pollutants).

Full vacuum at idle will provide better throttle response and torque at low

RPMs.









"Golley G Willickers" <golley_g_willickers(at)webtv.net> wrote in message

news:28549-40DCDFF6-38(at)storefull-3151.bay.webtv.net...

> i just picked my `75 vette up from the shop to have the elderbrock carb

> adjusted(its too rich) and the mechanic had the vacuum hose from the

> distributor switched from one that sucks when you give it the gas to a

> vacuum inlet on my carb that sucks all the time. when i asked him about

> it he said a distributor with points had it the way with a inlet that

> sucks when you give it the throttle but mine with electronic ignition is

> suppose to have the vacuum all the time. is this right? if so, why

> wouldn`t it be okay to connect it to the intake behind the carb?

> my friend that runs a parts store thought both distributors needed the

> hose to the carb inlet that sucks when gas is applied. who is right?

> thanks for any info.

>








Next Topic

SUBJECT: Re: vacuum hose to advance question
Go

From: Robotron Tom <usa1(at)nospamiei.net>

Subject: Re: vacuum hose to advance question

Date: 26 Jun 2004 06:37:02 GMT

Lines: 29

NNTP-Posting-Host: p-129.newsdawg.com

________________________________________________









golley_g_willickers(at)webtv.net (Golley G Willickers) started a controversy

when he said in news:28549-40DCDFF6-38(at)storefull-3151.bay.webtv.net:



> i just picked my `75 vette up from the shop to have the elderbrock carb

> adjusted(its too rich) and the mechanic had the vacuum hose from the

> distributor switched from one that sucks when you give it the gas to a

> vacuum inlet on my carb that sucks all the time. when i asked him about

> it he said a distributor with points had it the way with a inlet that

> sucks when you give it the throttle but mine with electronic ignition

is

> suppose to have the vacuum all the time. is this right? if so, why

> wouldn`t it be okay to connect it to the intake behind the carb?

> my friend that runs a parts store thought both distributors needed the

> hose to the carb inlet that sucks when gas is applied. who is right?

> thanks for any info.



It should have high vacuum at idle and little to no vacuum when you raise

the engine RPM. So it should be connected to a port below the throttle

plates. You can tell if it`s working properly by connecting a timing

light and checking for advance while raising the engines RPM. It should

be in full advance by around 3000 RPM.



--

Robotron Tom *remove nospam to email*

See the Flashback Arcade at: http:// www.arcadeguy.net



May God bless Nancy Reagan and family. May he ease their pain.

We have lost a great man.





Next Topic
From: Robotron Tom <usa1(at)nospamiei.net>

Subject: Re: vacuum hose to advance question

Date: 26 Jun 2004 06:37:02 GMT

Lines: 29

NNTP-Posting-Host: p-129.newsdawg.com

________________________________________________









golley_g_willickers(at)webtv.net (Golley G Willickers) started a controversy

when he said in news:28549-40DCDFF6-38(at)storefull-3151.bay.webtv.net:



> i just picked my `75 vette up from the shop to have the elderbrock carb

> adjusted(its too rich) and the mechanic had the vacuum hose from the

> distributor switched from one that sucks when you give it the gas to a

> vacuum inlet on my carb that sucks all the time. when i asked him about

> it he said a distributor with points had it the way with a inlet that

> sucks when you give it the throttle but mine with electronic ignition

is

> suppose to have the vacuum all the time. is this right? if so, why

> wouldn`t it be okay to connect it to the intake behind the carb?

> my friend that runs a parts store thought both distributors needed the

> hose to the carb inlet that sucks when gas is applied. who is right?

> thanks for any info.



It should have high vacuum at idle and little to no vacuum when you raise

the engine RPM. So it should be connected to a port below the throttle

plates. You can tell if it`s working properly by connecting a timing

light and checking for advance while raising the engines RPM. It should

be in full advance by around 3000 RPM.



--

Robotron Tom *remove nospam to email*

See the Flashback Arcade at: http:// www.arcadeguy.net



May God bless Nancy Reagan and family. May he ease their pain.

We have lost a great man.








Next Topic
From: kkfcee(at)gmail.com

Subject: vacuum leak / dramatic hesitration on acceleration / headlight issues

Date: 2 Dec 2006 19:53:48 -0800

Lines: 19

NNTP-Posting-Host: 65.8.160.178

________________________________________________









I have an `81 vette and it jsut started hesitating today. Myt

headlights go up and down OK, but when I shut the car off with the

headlights on, then I turn the lights off, the doors go down. I have

few other 81`s and an 82 and they do not do that. This issue started

today as well the hesitation. The car idles rough, and often stalls.

Acceleration is nearly impossible. The fact that the headlights go up

and down makes me think there is no vacuum leak, ast least not between

the manifold and the lights.



There is a vcacuum lead that comes out of the front of the base of the

carb. it is about 16 inches long, and it is just hanging there . I

cannot figure out where it goes. There is place that it would seem to

go which has 2 possible conections. It is toward the passanger side

between the carb and the distributor. I tried both , and neither had

any effect. it has a bit of suction, and it increases when RPM`s rise.





any ideas?










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