Thermoquad on 340 (plug photos)
So I decided to try the Thermoquad a while back. The first thing I noticed was how much more stable the was...
The TQ is the Pinnacle of carburetors from Carter. It’s a very well-designed unit. Yes, a copy of the Quadra jet on a lot of fronts, but, it seems to work really well for a old archaic barbaric device. The double booster ring helps a lot.
And the motor liked the bigger secondaries (440 carb.)
Errrr, that would be the primaries since all secondary sides are the same 2-1/2 inches. LOL
So, ...and here's the fun! I decided to follow old recommendations from "demonsizzler" that I found on FABO from when he was on here. Also checked the MP bible settings for "Bracket 340 with TQ and LD340 intake." And it really WOKE THIS MOTOR UP!! :D
I used to have some chats with Demonsizzler before he retired and concentrated on his family. He’s a good fella.
Also, it is amazing how many people beat up the MP engines book as if it was written to screw you.
I had a 440 TQ up top my milled divider LD-340. Quite an impressive improvement for something so simple.
I had removed the choke before (and it starts just fine for me.) I drilled the secondaries out to .149", kept the same .101" primaries. Drilled the pump nozzles to .038" and opened up the air door to 17/32" from the tower, and set it for very little drop when running. I checked and set the secondary throttle blades to 81* per the manual. and have the air door spring at 2-1/2 turns.
This amount of tinkering is required with carbs and more so when a stock crab is used. Getting the TQ to work great is just time and patients. For new guys, I should have suggested a lot book to keep track of things.
Anyway, I am a Thermoquad convert for sure!!!!!!!!!
You and many others !!!!
When you get how they work, there a scream!
Like you mentioned, when that thing opens up and kicks in, HOLY MOLY that thing kicks hard!
Thats my report. I added all the info in case it is helpful for someone in the future.
Keep everyone updated!
