[Stormtrooper]

Ok so i just got a good looking used edelbrock thunder series 650 cfm. i was cleaning it and i noticed this. i am young and new to carbs so i dont know what it is. i noticed that one of the little brass pieces stickin out was missing on one side. i was wondering if someone could tell me what that is and what it does and how to replace it.


thanks

[ChadGresham]

From your picture I don't see anything missing?

[Stormtrooper]

Yes sorry. I failed to mention that this is not my carb. It's a picture I found on the interweb. I'm talking about the little goldish/brass piece sticking out of what I circled. Mine is missing one on one side.

[unix]

Pull the top off the carb and it is obvious how that comes apart. Not sure what you paid for it do not care but if that jet is missing. I would be wondering what else is wrong with that carb. I notice you said it was not the picture of yours, if your looks like that one it is not the Thunder serious carb.

[Stormtrooper]

That was just the only good picture I could find looking down the throat of a edelbrock. Mine isn't the same one as that. So your saying that that's a jet? Would that be the primaries or secondaries?

I will try and get a actual pic of mine up later

[unix]

That is the secondary, no need to post a picture, the thunder has an air dam in the top of the air horn and two fuel inlets, one is live the other capped off. You will need to order the whole part. Go to the Eldo web site and check out the user manual, that should give you a pictorial of a part break down. Best suggestion I can give you.

[cobalt327]

Originally Posted by Stormtrooper

That was just the only good picture I could find looking down the throat of a edelbrock. Mine isn't the same one as that. So your saying that that's a jet? Would that be the primaries or secondaries?

I will try and get a actual pic of mine up later

That part is a discharge nozzle, it's sized to give the correct fuel flow from the secondary booster assembly (sometimes called the secondary booster "cluster"). Without the nozzle in place, there will be either way too much fuel flow, or possibly less or even no fuel flow because the orifice isn't in the venturi air stream the way the discharge nozzle is designed to be. But in any event, it needs to be replaced.

The discharge nozzle itself is not a service part- it is not made to be removed from the secondary booster assembly and if yours is missing (and not just pressed too far up into the booster casting), it either fell out (and could have destroyed the engine if it fell off while running) or was removed for some reason by a previous owner. I do not think the secondary booster assembly is sold separately, but you can give Edelbrock a call to find out for sure.

There's a chance- depending on your abilities and "engine-uity"- that you can remove both clusters, examine and measure the good one, and find/make a suitable replacement for the missing one. Hobby shops carry brass tubing and rods, etc., as well as whatever you might have on hand. Use Loctite 271 or JB Weld to hold it in place.

Otherwise you might be looking at finding a replacement online. A fair number of these Edelbrock carbs get their base plates broken from being dropped (the base plate is not replaceable) and carbs get ruined by the idle mixture screws being over tightened, which breaks the casting. So there are carb cores w/good boosters out there.



Good luck.

[cobalt327]

I forgot- Edelbrock Owner’s Manual covering Performer and Thunder series carbs- HERE.

[ChadGresham]

Oh yes search ebay or something see if you can find just the top, i think its called the air horn?

[ChadGresham]

I take that back that is under the top,once you pull the top (airhorn) that thing just bolts on (requires a gasket as well) but still search ebay because cobalt327 is right i see parts and pieces of edelbrocks online all the time