Plenum Vacuum lines... - ZR-1 Net Registry Forums

LGAFF · 03-25-2009

In chasing my plenum vacuum leak, I ran across hard emission lines sold in a packet at Autozone. The line is slightly bendable and I found that if you take a hairdryer, put it on high heat you can mold the lines to the same configuration of the originals and use the factory fittings. UPon heating, you can twist the line, turn it with 90 degree bends and it stays formed in that position.

Once I heated the line, I held it in place and then switched the hair dryer to cool to help the molding process. Obviously a heat gun would work better, but this worked well. I also noticed that Dorman sells a three way check valve just as we have under the plenum.

tomtom72 · 03-25-2009

Nice find! Thanks for passing it on also!

Just in time for my under plenum excursion this weekend. That 3 way vac check will put a period on my punch list for under there. I'll have to take a trip to A/Zone and look at their dorman selection. You don't have a P/N on it?

Tom

Paul Workman · 03-25-2009

Quote:

Originally Posted by LGAFF

In chasing my plenum vacuum leak, I ran across hard emission lines sold in a packet at Autozone. The line is slightly bendable and I found that if you take a hairdryer, put it on high heat you can mold the lines to the same configuration of the originals and use the factory fittings. UPon heating, you can twist the line, turn it with 90 degree bends and it stays formed in that position.

Once I heated the line, I held it in place and then switched the hair dryer to cool to help the molding process. Obviously a heat gun would work better, but this worked well. I also noticed that Dorman sells a three way check valve just as we have under the plenum.

Secondaries??? Weee doan neeed no SECONDARIES!!!

P.

LGAFF · 03-25-2009

No part # its in the misc section for repair parts, where they have door universal door handles, hood latch release cables, etc.

The vac hose is back by the PCV valves in the back of the store

phrogs · 03-26-2009

Quote:

Originally Posted by LGAFF

No part # its in the misc section for repair parts, where they have door universal door handles, hood latch release cables, etc.

The vac hose is back by the PCV valves in the back of the store

what did you use to glue the ends to this hose?

LGAFF · 03-26-2009

Did not need glue to seal

VetteMed · 03-27-2009

What size tubing replaced the stock stuff?

jonszr1 · 03-27-2009

you can buy the exact size as factory, pep boys kragens and auto zone all sell every size of plastic hose that one would need

Ccmano · 03-27-2009

The tubing size is 3.9mm.

H

secondchance · 03-27-2009

I know I have busted vacuum spider at the moment and will be pulling the plenum to repair the vacuum line. I also have a set of FIC injectors which I will be replacing at the time.

I was thinking about replacing at least easy ones with 1/8" or 3/32" OD aluminum tubing. If it needs to be bent, I figured a wire coat hanger inside the tube while bending may keep it from crimping.

Has anyone tried this before?

03-25-2009	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Plenum Vacuum lines... In chasing my plenum vacuum leak, I ran across hard emission lines sold in a packet at Autozone. The line is slightly bendable and I found that if you take a hairdryer, put it on high heat you can mold the lines to the same configuration of the originals and use the factory fittings. UPon heating, you can twist the line, turn it with 90 degree bends and it stays formed in that position. Once I heated the line, I held it in place and then switched the hair dryer to cool to help the molding process. Obviously a heat gun would work better, but this worked well. I also noticed that Dorman sells a three way check valve just as we have under the plenum. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-25-2009	#2
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Plenum Vacuum lines... Nice find! Thanks for passing it on also! Just in time for my under plenum excursion this weekend. That 3 way vac check will put a period on my punch list for under there. I'll have to take a trip to A/Zone and look at their dorman selection. You don't have a P/N on it? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

03-25-2009	#4
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Plenum Vacuum lines... No part # its in the misc section for repair parts, where they have door universal door handles, hood latch release cables, etc. The vac hose is back by the PCV valves in the back of the store __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-26-2009	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Plenum Vacuum lines... Did not need glue to seal __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-27-2009	#7
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: Plenum Vacuum lines... What size tubing replaced the stock stuff?

03-27-2009	#8
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Plenum Vacuum lines... you can buy the exact size as factory, pep boys kragens and auto zone all sell every size of plastic hose that one would need

03-27-2009	#9
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Plenum Vacuum lines... The tubing size is 3.9mm. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

03-27-2009	#10
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,723	Re: Plenum Vacuum lines... I know I have busted vacuum spider at the moment and will be pulling the plenum to repair the vacuum line. I also have a set of FIC injectors which I will be replacing at the time. I was thinking about replacing at least easy ones with 1/8" or 3/32" OD aluminum tubing. If it needs to be bent, I figured a wire coat hanger inside the tube while bending may keep it from crimping. Has anyone tried this before?

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