SleeperScamp
Well-Known Member
I have the 850 thermoquad off my 78 Lil Red Express. Is this carb any better than the Edlbrock 750 (1411) that I have on my Duster now? Any gains in performance? Thanks
For the most part, the TQ is hard to beat. The reason is the primary side is small and sensitive to it's position. The engine reacts very well with the high velocity air speeds that run through the primary side.
The secondary side is spring loaded and tuneable.
The draw back of the squarebore carb is the primary side are equal or near equal in size so there isnt a powerful primary reaction unless it is properly sized and if it isn't, it feels soggy. When the secondary side kicks in, it will feel like a turd or nothing is happening.
For street strip and drivers (Stock or mildly modified) the TQ is my weapon of choice.
Full track runner, it is a Holley. But the Holley I'm useing is not a stock carb! Double pumper, 4 corner idle, adjustable air bleeds. A TQ doesn't have that. (Or really even need it.)
More so a space problem. Carb height is an issue. Not a fan of that spacer.
... would using a spacer to run a TQ on a square-bore manifold (Eddy RPM) be less efficient than running a good street square-bore like an AVS?
Of course, I meant space limitations aside. I think a TQ with a spacer would fit under my hood if I got a drop-base air cleaner; right now my factory dual-snorkel 4-bbl. air cleaner fits nicely on top of an AFB carb, 1/4" spacer and RPM Air-Gap.
Well said. :cheers:
I run a 3/4" adapter/spacer for my TQ on an LD340 intake. I also use my factory dual snorkel air cleaner and use a 2" spacer btween the carb and air cleaner. TQ's dont like dropped base air cleaners - the lid should be up off the carb to improve air flow - not so irregular
Thank you!
lil red, do you know that you can modify the carb pad on the LD-340 to fit a TQ?
Great mention on the air cleaner base plate. I have noted just that. A drop base is difficult to find for a TQ. The top of the fuel bowl's are tall and finding a drop base plate to fit is a pain.
Also, the limitation above the carb hamppers the carb at wide open throttle. Through a lot of tried out air cleaner units, a carb just simply needs space above it to operate correctly, freely and at it's best potential.
This question I can not answer. I really do not know. I supose the wrong spacer would, but I really do not see it with the typical TQ to squarebore adapter.does the carb spacer improve flow - or should i just machine the intake to accept the carb. Someone mentioned once to add the spacer so I made it years ago
just wondering - thanks