Gain extra benefits by becoming a Supporting Member Click here find out how!

Classic Performance Products Nu-Relics Power Windows
American Auto Wire Hellwig Products IncPerformance Rod & Custom
Danchuk Catalog



Username Post: Modulator Pipe        (Topic#368723)
N_V_US_67 
Poster
Posts: 81

Loc: Brisbane, Australia
Reg: 05-21-15
06-16-22 09:10 PM - Post#2843007    

hello all,
I hope everyone is fit and well.

My problem is : I've just had the transmission out for a rebuild and found the modulator pipe is in two pieces joined by a piece of rubber tube. The two miss matched pipes are different diameters and the rubber tube holding them together wasn't doing its job by sealing them together properly.

So I have done some investigating and found that very few make a replacement pipe for a 1967 Impala with a 327/powerglide.
But, everybody sells a modulator pipe for a Camaro of the same year with the same running gear, its a one piece pipe that goes from the modulator up to the fitting on top of the inlet manifold at the back of the carburetor.

Now my question is will this pipe fit the Impala, has any one changed theirs and used this pipe?

Inline Tube sell one part number CFT6703 (Impala) and CCT6903 (Camaro), I have been in contact with them and they say they will.
Trim Parts/Right Stuff sell one part number FTV6701 (Camaro/Impala?) and they haven't got back to me yet as to whether it will fit or not.

Any help/advise would be greatly appreciated.

Thanks, Chris.



 


Jynx 
Poster
Posts: 58

Loc: Australia
Reg: 03-01-11
06-17-22 06:47 PM - Post#2843063    
    In response to N_V_US_67

Can't comment on the pipe, my car just has a vacuum hose from the carby port to the transmission.

Seems like a lot of messing around to me though, unless the car is in concourse condition of course, especially for a junction that can only be seen from underneath the car. If the existing pipe is in good condition I would simple rectify the poor joiner & move on to the more important problems that these old cars always seem to have.

67 Impala 4Dr Hardtop.


 
N_V_US_67 
Poster
Posts: 81

Loc: Brisbane, Australia
Reg: 05-21-15
06-18-22 05:09 PM - Post#2843091    
    In response to Jynx

Thanks Jynx,

No, my car is not a concourse edition and probably never will be while I own it, its a driver.

The problem is which will last longer? Rubber or Steel. Rubber short term or steel long term?

The two pipes are far from Ideal to reuse as the top half is double the size of the lower and which size rubber joiners do I need, small for the lower or bigger for the top? As you can see by the photo.



Rubber is a good and cheap fix and one I am considering as a last resort for now.

Cheers, Chris.



 
Jynx 
Poster
Posts: 58

Loc: Australia
Reg: 03-01-11
06-18-22 06:21 PM - Post#2843094    
    In response to N_V_US_67

It may not be as hard as it looks, but depends on the distance between the two pipes, and if it's not enough then you may need to shorten one pipe a little. So what I would be trying to do is get the correct i.d. hose for each pipe then use a metal joiner that suits both size hoses. If you can't locate one it would be a 5 min job on a lathe to make one, or alternatively replace the metal pipe with vacuum line like mine.

67 Impala 4Dr Hardtop.


Edited by Jynx on 06-18-22 06:23 PM. Reason for edit: No reason given.

 
toro455 
"7th Year" Silver Supporting Member
Posts: 702
toro455
Loc: Western NY
Reg: 06-15-02
06-18-22 07:58 PM - Post#2843096    
    In response to Jynx

The geometry of the engine and the trans wouldn't be any different between the cars you're referring to so the only thing stopping the alternative part you found from working would be an accessory, exhaust manifold etc in the way.

It will have the correct ends. I would buy it and it it needs re-routing I would cut the ends off and I would custom bend a tube routed the way I thought it should go and then I would flare the part I used for the custom bend and I would braze the ends on my tube. I've used an AN flaring tool which works great as a nest for a piece of braze wire. If the flare bothers you after you can always grind some of it away. The Cu-Ni tube is excellent for bending/flaring and Harris Stay-Brite 8 works with Cu-Ni, steel and stainless. I would need to check which flux I use. I would also say wear a mask when you braze with the flux. Some people have reported being extremely sensitive to it.

Scott



 
jktucker92 
Silver Supporting Member
Posts: 525
jktucker92
Loc: West Richland, WA
Reg: 02-05-17
06-22-22 09:19 AM - Post#2843224    
    In response to toro455

That configuration looks stock to me. I recall having a short rubber joint that joined a large tube to small tube. The small tube was inserted into the large tube and the rubber hose fit over the top and held them together and sealed the unit. The small tube had a bubble that matched the OD of the large tube. However, I think that junction was at a fitting, not another tube. I'll have to look at my engine to see if I can remember how that worked. My car was a 327 / PowerGlide, so they could have used the same arrangement to join two tubes in other configurations.



 
N_V_US_67 
Poster
Posts: 81

Loc: Brisbane, Australia
Reg: 05-21-15
06-22-22 11:26 PM - Post#2843247    
    In response to jktucker92

jktucker,

I think your right about it being standard for around that year onwards.

I was googling and found this
https://67-72chevytrucks.com/vboard/showthread.php...
where on a 66 Chevy truck he has the same set up and others are saying its the same on theirs as well.
The larger tube has a loop in to stop fuel going down into the modulator and affecting it in some way, according to them and joins the smaller tube at the back between the head and firewall.

Me, I would still like to fit a one piece one though if just to eliminate leaks.



 


Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

198 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.269 seconds.   Total Queries: 19   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 06:15 AM
Top