Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: oktorque on February 05, 2015, 04:32:45 PM

Title: Is this baseplate trash?
Post by: oktorque on February 05, 2015, 04:32:45 PM

I'm wondering if this base plate will leak vacuum.  Are the mix screw slots cut too deep? 

http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151207_zps05vhm3bg.jpeg

http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151158_zpsn24tp1wi.jpeg

http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151122_zpswa1gesxo.jpeg

Title: Re: Is this baseplate trash?
Post by: oktorque on February 07, 2015, 08:18:45 AM

(http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151207_zps05vhm3bg.jpeg) (http://s659.photobucket.com/user/bobbyrogue/media/20150205_151207_zps05vhm3bg.jpeg.html)

(http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151158_zpsn24tp1wi.jpeg) (http://s659.photobucket.com/user/bobbyrogue/media/20150205_151158_zpsn24tp1wi.jpeg.html)

(http://i659.photobucket.com/albums/uu316/bobbyrogue/20150205_151122_zpswa1gesxo.jpeg) (http://s659.photobucket.com/user/bobbyrogue/media/20150205_151122_zpswa1gesxo.jpeg.html)

Will this throttle plate seal?

Title: Re: Is this baseplate trash?
Post by: Ethan1 on February 07, 2015, 10:09:24 AM

 I think it is trashed. Those gouges don't look great and I think it will be hard to seal with the gasket. I am sure there is something that would work, but I would worry about a vacuum leak. Just my opinion though.

Title: Re: Is this baseplate trash?
Post by: oktorque on February 08, 2015, 08:31:14 AM

Cliff, what do you think? 

Title: Re: Is this baseplate trash?
Post by: oktorque on February 13, 2015, 05:05:47 PM

You know, judging by the mating surface on the middle section, and after looking at photos in Cliff's book, pg. 29, 30 and 67, I don't think it is trash.  I can see where the 'ridge' on the mating surface hits and it should be good.

However, I will prep and bush a spare b.plate and have it ready, in case my theory turns to tuning nightmare with vacuum leaks.  Ha!

Title: Re: Is this baseplate trash?
Post by: Ethan1 on February 13, 2015, 09:02:38 PM

Quote from: oktorque on February 13, 2015, 05:05:47 PM

You know, judging by the mating surface on the middle section, and after looking at photos in Cliff's book, pg. 29, 30 and 67, I don't think it is trash.  I can see where the 'ridge' on the mating surface hits and it should be good.

However, I will prep and bush a spare b.plate and have it ready, in case my theory turns to tuning nightmare with vacuum leaks.  Ha!

 I hope your theory works as well. ;D

Title: Re: Is this baseplate trash?
Post by: oktorque on February 15, 2015, 05:00:46 PM

I was so confident that it was good I rebuilt another b.p.  It was for a turbo and the v.hole didn't go through, so I drilled it.  I also substituted a better suited t.shaft, bushed it, enlarged the mix holes to .090, drilled access to them larger, snipped off a ring of the mix screw springs, and mushroomed the end of the plate screws.  All good fun.

Title: Re: Is this baseplate trash?
Post by: Cliff Ruggles on February 17, 2015, 03:47:01 AM

Compare the gaskets above and below it.  It may be OK, as there is a lot of extra material on those on the front side....Cliff