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Re: Do Street Demon crabs sound like a TQ? [Re: WO23Coronet] #2633903
03/18/19 02:51 AM
03/18/19 02:51 AM

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RWG75
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Originally Posted by WO23Coronet
Speaking of TQ's, does anyone sell jet/rod kits for them?


my fav spot:

https://quadrajetparts.com/carter-thermo-quad-carburetor-c-299_158.html

Re: Do Street Demon crabs sound like a TQ? [Re: ] #2633989
03/18/19 10:42 AM
03/18/19 10:42 AM
Joined: Jan 2003
Posts: 16,802
Between Houston & Galveston TX
SattyNoCar Offline
Smarter than no class Flappergass by a mile
SattyNoCar  Offline
Smarter than no class Flappergass by a mile

Joined: Jan 2003
Posts: 16,802
Between Houston & Galveston TX
Originally Posted by RWG75
Originally Posted by WO23Coronet
Speaking of TQ's, does anyone sell jet/rod kits for them?


my fav spot:

https://quadrajetparts.com/carter-thermo-quad-carburetor-c-299_158.html



Yes. I've bought a number of TQ parts from them, always good parts and good service.


John

The dream is dead, long live the dream.......😥
Re: Do Street Demon crabs sound like a TQ? [Re: Dave Hall] #2634005
03/18/19 11:12 AM
03/18/19 11:12 AM
Joined: Jan 2003
Posts: 17,801
S.E. Michigan
ZIPPY Offline
I Live Here
ZIPPY  Offline
I Live Here

Joined: Jan 2003
Posts: 17,801
S.E. Michigan
Beware the Demon Crabs!

not to be confused with Hermit Crabs


Rich H.

Esse Quam Videri




Re: Do Street Demon crabs sound like a TQ? [Re: ZIPPY] #2634243
03/18/19 10:50 PM
03/18/19 10:50 PM
Joined: Feb 2003
Posts: 7,979
Scranton, PA
Montclaire Offline
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Posts: 7,979
Scranton, PA
I've noticed that Rockauto has a bunch of remanned thermoquads available for around $225-250 each. Has anyone tried one? I haven't picked a carb yet for my roller 360.

Re: Do Street Demon crabs sound like a TQ? [Re: Montclaire] #2635128
03/21/19 10:24 AM
03/21/19 10:24 AM

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RWG75
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I've never seen a reman TQ come out of the box ready to run. If ya assume wrong jets / rods, leaking fuel xfer slots, wrong float height, choke and fast idle linkage completely out of wack yer better off building one yourself because that's pretty much what your gonna end up doing. My method is grab a couple cheap basket case donors off ebay or craigs, order a few parts and go from there. No, they aren't an easy carb to learn and that's pretty much why they never come out of the box right.

Re: Do Street Demon crabs sound like a TQ? [Re: ] #2635133
03/21/19 10:33 AM
03/21/19 10:33 AM
Joined: Feb 2003
Posts: 7,979
Scranton, PA
Montclaire Offline
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Scranton, PA
I've been looking into this for the past few days. Rock Auto has rebuilds from Autoline and United Reman, and they have a wide range of part numbers based on application (not a one-size-fits-all). Summit has three TQs listed as "Summit brand" but no application data and they are 800 cfm. Classic has several listed by application but no real specs, those are remanned by Tomco.

Re: Do Street Demon crabs sound like a TQ? [Re: Montclaire] #2635233
03/21/19 02:21 PM
03/21/19 02:21 PM

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RWG75
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Here's one problem: the TQ is a modular carb consisting of (3) main sections - the throttle plate, the fuel bowl and bowl cover. It's very easy to mix and match sections from different carbs and build 1,000 different combos. The fuel bowl is pretty much the same for all. The throttle plate comes in 2 different primarie sizes and it lean burn or non lean burn configs. The bowl cover comes in many different flavors with many different emission control options.

The only Carter ID number for the complete assembly is stamped on the throttle plate. There are guides that will tell you what size rods and jets should be in the carb but I've never seen anything that matches up the various bowl cover part numbers to a carb model number. IF the reman company is listing the assy by Carter model number or even their own stock number that corresponds to an application, there is no way to tell what the original core they started with was. As in: a 71 340 throttle plate with a 78 440 air horn and a jet / rod combo for 75 318.

I kinda doubt that they spend much time trying to put the pile of cores back together as originally built. It would be nice but I suspect they simply take whatever core comes down the line next, strip it, clean it and put it back together with new gaskets, seals, accel pump, etc.

Re: Do Street Demon crabs sound like a TQ? [Re: ] #2635245
03/21/19 02:48 PM
03/21/19 02:48 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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Posts: 21,318
Manitoba, Canada
iagree I've got a 74 440 truck thermoquad. It has no emissions provisions at all so I've held onto it. Well tuned it's the next best thing to fuel injection. However well tuned was a bit of work. They're counter intuitive to a lot of guys because you have to bend linkages and play with the secondary air door spring tension. But after all was done, I could fire it up on a col morning, kick it down after 30 seconds and be on my way.

Re: Do Street Demon crabs sound like a TQ? [Re: DaytonaTurbo] #2635356
03/21/19 08:49 PM
03/21/19 08:49 PM
Joined: Jan 2003
Posts: 11,890
Benton, IL.
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DaveRS23 Offline
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Benton, IL.
Thermoquads are okay carbs. But they can be a bear to get parts for. And not just everyone can tune one properly.

And while your TQ may be the best thing next to fuel injection for you, realistically ANY good design carb with a proper tune could give the same results you experienced with the TQ. Again, TQs are okay, but they are not anything that special in this day and age. Well, except maybe that sound.............................. grin


Master, again and still
Re: Do Street Demon crabs sound like a TQ? [Re: DaveRS23] #2635400
03/21/19 10:39 PM
03/21/19 10:39 PM
Joined: Feb 2003
Posts: 7,979
Scranton, PA
Montclaire Offline
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Posts: 7,979
Scranton, PA
Yeah, the sound is a consideration. haha I have a mostly complete 9077s and I can probably get another one from a stock 73 440. Maybe I'll get lucky and find someone local who knows how to rebuild one of these things.

Re: Do Street Demon crabs sound like a TQ? [Re: Montclaire] #2635485
03/22/19 09:42 AM
03/22/19 09:42 AM

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RWG75
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Rebuild, as in rip it open and replace a few wear / tear parts is actually pretty simple. The biggest challenge there is picking a metering rod / jet combo that will work with you engine configuration. The link above sells a few and how to mix / match what you've got laying around can take a little head scratching but isn't too bad.

Tuning isn't that ugly and is pretty much like any other 4 bl carb with a few additions. One is metering rod height as the base setting impacts idle mix (see also jet / rod combo). Another is secondary air door tension.

The big ugly is the linkages for the choke, fast idle, secondary lock out, accel pump and secondaries. It's pretty tedious and a tiny misadjust can foul it up completely. It doesn't help that there's like 7 or 8 adjustments that are each dependant on the previous adjustment. Your best friend there is another TQ that is set up right so you can stare and compare.

As for finding a shop to deal with it: there are better ways to spend your time. I haven't tried lately but I think finding a carb shop is kinda like finding a radiator shop, maybe worse. If ya do find one, the odds of them having actually heard of a TQ are probably kinda slim. If ya happen across an old timer that remembers working on one, he'll probably cringe and refuse to touch it. The exception being a few of us hard core old timers. There are a couple of shops out in web land that do them right and have a good rep but they'll be pricey.

My advise has always been to roll up yer sleeves and go a few rounds with it yerself.

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