VAC Leaks - ZR-1 Net Registry Forums

Blue Flame Restorations · 03-05-2012

Question????

Why doesn't anyone use compression fittings on the vac lines under the plenum? Either with plastic or even steel lines, in order to prevent un-needed plenum pulls????

Paul Workman · 03-06-2012

Quote:

Originally Posted by Blue Flame Restorations

Question????

Why doesn't anyone use compression fittings on the vac lines under the plenum? Either with plastic or even steel lines, in order to prevent un-needed plenum pulls????

Hummm.... That might work. I could be wrong, but I don't get the sense that it is a repeating issue. Once the rubber sleeves/tees are replaced - these 16-21 year old connections - that is that.

And, then there is the "sans secondaries" approach to the problem...

Parts not used seldom break, and they don't cost much to replace!

& It runs so nice with that stuff "outta thar!"

P.

Blue Flame Restorations · 03-06-2012

I plan to remove the secondaries as well.

It just seems that I hear so much about vac leaks, I was just thinking "compression fittings". May not be needed??

bdw18_123 · 03-06-2012

When I rebuilt my vacuum system, I just replaced any cracked plastic hose and any hard or brittle rubber connections (the secondaries vacuum solenoid too). And I put small, black zip-ties on any rubber to plastic vacuum hose connection where the plastic side didn't have a little barb or raised area to help keep the rubber part on.

I've put over 3,000 miles on now since I got my Z running and my vacuum system is still nice and tight. One time after being in a store for 30 - 40 minutes or so, when I turned the key on, the pump only ran for a couple seconds and then shut off. And I do a lot of 'spirited' driving!

So I think that most of the vacuum leak issues are with the cars that haven't ever had the plenum off, or had the vacuum system gone through and checked out thoroughly. Those that have, I would venture to say probably haven't really had any more vacuum leak issues (if any).

John Boothby · 03-06-2012

[QUOTE=So I think that most of the vacuum leak issues are with the cars that haven't ever had the plenum off, or had the vacuum system gone through and checked out thoroughly. Those that have, I would venture to say probably haven't really had any more vacuum leak issues (if any).[/QUOTE]

I agree. No problems since I replaced all the secondary stuff (with the exception of a new-out-of-the-box solonoid and a brand new actuator that went bad). I have reservations as to whether the car would pass smog with the secondaries removed.

Blue Flame Restorations · 03-07-2012

I'm fairly new to the game but soak up everything I can. It just seems that we talk about vac leaks a lot.

RHanselman · 03-07-2012

Brett,

I'd love to have a system that requires less maintenance... Great idea...

PhillipsLT5 · 03-07-2012

Removed mine, less is better

03-05-2012	#1
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	VAC Leaks Question???? Why doesn't anyone use compression fittings on the vac lines under the plenum? Either with plastic or even steel lines, in order to prevent un-needed plenum pulls???? __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project

03-06-2012	#3
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	Re: VAC Leaks I plan to remove the secondaries as well. It just seems that I hear so much about vac leaks, I was just thinking "compression fittings". May not be needed?? __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project

03-06-2012	#4
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 809	Re: VAC Leaks When I rebuilt my vacuum system, I just replaced any cracked plastic hose and any hard or brittle rubber connections (the secondaries vacuum solenoid too). And I put small, black zip-ties on any rubber to plastic vacuum hose connection where the plastic side didn't have a little barb or raised area to help keep the rubber part on. I've put over 3,000 miles on now since I got my Z running and my vacuum system is still nice and tight. One time after being in a store for 30 - 40 minutes or so, when I turned the key on, the pump only ran for a couple seconds and then shut off. And I do a lot of 'spirited' driving! So I think that most of the vacuum leak issues are with the cars that haven't ever had the plenum off, or had the vacuum system gone through and checked out thoroughly. Those that have, I would venture to say probably haven't really had any more vacuum leak issues (if any). __________________ [IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:)

03-06-2012	#5
John Boothby Join Date: Jul 2005 Location: Las Vegas, Nevada Posts: 777	Re: VAC Leaks [QUOTE=So I think that most of the vacuum leak issues are with the cars that haven't ever had the plenum off, or had the vacuum system gone through and checked out thoroughly. Those that have, I would venture to say probably haven't really had any more vacuum leak issues (if any).[/QUOTE] I agree. No problems since I replaced all the secondary stuff (with the exception of a new-out-of-the-box solonoid and a brand new actuator that went bad). I have reservations as to whether the car would pass smog with the secondaries removed. __________________ JB 1990 #148 Red/Saddle Haibeck AYBKG5 Chip/RC Engineering/Flowmasters/K&N/Samco/Fuzzy Dice :cheers:

03-07-2012	#6
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	Re: VAC Leaks I'm fairly new to the game but soak up everything I can. It just seems that we talk about vac leaks a lot. __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project

03-07-2012	#7
RHanselman Join Date: Jul 2005 Location: Cresson, TX Posts: 970	Re: VAC Leaks Brett, I'd love to have a system that requires less maintenance... Great idea...

03-07-2012	#8
PhillipsLT5 Join Date: Aug 2005 Location: Scottsdale, AZ Posts: 2,452	Re: VAC Leaks Removed mine, less is better