Corvette Forum Archive (38 950 posts)
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Subject:
vacuum hose to advance question
From: golley_g_willickers(at)webtv.net (Golley G Willickers)
Subject: vacuum hose to advance question
Date: Fri, 25 Jun 2004 21:31:18 -0500
Lines: 12
NNTP-Posting-Host: localhost.webtv.net
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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.
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
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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.
>
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.
>
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
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