Here's the latest spreadsheet. I added some notes trying to capture what's being said. But, I didn't change TQ secondary jets to be replaceable, but will. Also, my method is to only say "Yes" if it has the function but not to say "No" if it doesn't as I want to keep it simple to read.

Bill - I saw that after I'd finished the table for today, but will update it to reflect the removable secondary jets on the TQ. But, the tapered metering rods do work similar to stepped ones - right? And, I'm looking to see if you have other upgrades or corrections.

Also, I got the pics and have looked at them a bit. Wow! Lotsa pics! Thanks. So, that's the Chrysler TQ, which you have there. Do you know what it is off of or have the #'s off of it? I'm curious if it is the smaller (less big?) one or the bigger one. And, the size of the engine it was destined for would say something about its current jetting.

Which brings up the issue of re-jetting or tuning a TQ. If you still have the coffee cans full of parts then that might not be an issue, but otherwise I think it might. I guess I need to be more diligent with searching for those things.

I figured this was the most appropriate thread for this information. I was reading through the manual for the Street Demon, and cam across something to share. The Street Demons come with the kickdown assembly already installed, and held in place by a shipping screw. What they do not come with is the spring and perch kit (Demon PN: 1954) that returns the kickdown to it's starting position. As mine is already on the truck, I'm going to hunt one down (approx. $17 on Jegs) and simply not drive much until it gets here.

Just a heads up for any and all going Demon for their carb needs.

Interesting. Luckily Dad's truck will have the ZF5 so that's not an issue, but it is good to know.

True enough, but I do have an honest question, and it is more a carb than alt question so: where will you be powering the choke from? It requires a full 12V when in run. And it is only the pos side.

I plan to pull a relay in with the stator voltage, and it will put full battery voltage on the choke. The reason for using the stator voltage to pull the relay in is that this approach means the choke is heated only when the engine is running.

As a follow-up, I bought a Street Demon 750 CFM with the polymer bowl today from Tim. More details in Dad's Engine.

Why does it have a polymer bowl?

Bruno,
Their site says it is for heat insulation.

I suspect it would alleviate the white fuzzy corrosion as well.

Jim's nailed it. Gary, did Tim charge you for the carb, or did he include it as an apology for taking so long? He just strikes me as the kind of guy to do the latter.

Strange things have happened since Holley bought up the ashes of BG. :-X20


"Optional Aerospace Composite fuel bowl... for optimum performance with modern fuels."
I'm just reading between the lines on this, but I think gas-ahol does not play well with whatever aluminum alloy they are using.

Jim, go back into the late 70s, Carter introduced the Thermoquad. It was the first US built carb with a phenolic bowl. The entire metering system was in the top or air horn portion. The idea was to keep the engine heat from affecting the fuel metering. Mikuni-Solex carbs on the Mitsubishi 4 cyl engines also had phenolic bowls with the meter system attached to the bowl cover.

I guess "modern fuels" came somewhere after rubbing two sticks together?

Bill,
I never dug into a Thermoquad, but the name makes sense now!
I'm very appreciative of all the things I learn from the members of this forum. :)

Jim, maybe "modern fuels" are unleaded? Or the 10% ethanol blends.

Yes, the polymer bowl is for keeping the fuel cool, and that does two things. First, it helps provide a consistent air/fuel ratio, much like the temp-controlled air cleaner does. Second, it helps to prevent boiling the fuel away in hot conditions.

As for throwing it in to make up for the lateness of the pistons, he didn't do that but he did cut me a good deal. Enough so that I could make a quick decision to buy the carb. I was intrigued by the carb from the point I found it. And, while it doesn't have all of the features the TQ has, it is getting good reviews. And, Tim liked the way it performed on the 400 he dyno'd.