So the question is, what intake is this? Also, how do I tell if I have a Racing Beat Holley?

Here is the story. Car has a rough idle, and fuel pours out the exhaust. Pic is less than a minute of idling.



The carb currently on there is a Holley 4160 1850-4. To eliminate this massive carb, I bought a stock Nikki. The Nikki unfortunately will not fit though, because the intake manifold is massive! So what do I have? Is it possible it's a Racing Beat manifold and carb?















Also, I have no history on this car, so I'm unsure of the port or other mods done to it. Fan clutch has been removed and is now electrical. Rats nest removed. And I assume the RB on my header means Racing Beat?

 

you have a stock N201 intake manifold that's been attacked with a grinder, and mated to a holley flange, and then they added 2 more adapter plates...

soOoooo to get the Nikki to fit you need a stock manifold, which should be pretty inexpensive to find

 

You'll want to find a manifold instead of taking all of those adapters off, too. The Nikki carb doesn't like working with an open plenum like that, not without a major reworking.

 

A few questions. How do you know it's a stock N201 manifold? I ask because it has some numbers on it, but they aren't N201.

Also, how did they "mate" a Holley flange to it? I don't see any sort of welds or anything crazy.

And for the other poster, what adapter plates are you talking about? The only "adapter" I have is an open spacer between the Holley and the manifold, with a weird plastic line that connects to the oil filler neck.

 

N201 is a subsection of a Mazda part number that means it came out on an '81 to '82 12A.

I see what looks like welds.

I also see two carb spacers or adaptors. The one welded to the N201 manifold is a spreadbore to sqaure bore adaptor. The other adaptor in your picture looks like a square bore carb spacer to raise the carb a bit in an attempt to increase low end torque by increasing runner length.

Is this carb spacer an open plenum or a 4 hole spacer?

 

Okay. So how are you telling that it's a stock manifold? Any tell tales? Also, my car is an 85, not an 81 or 82 (yes, I realize it could be a replacement)

 

The "weird plastic line that connects to the oil filler neck" is probably supposed to be a pcv valve but most likely wasn't done correctly.

 

Somebody welded a spread bore adaptor to a stock manifold.

 

You can see the black plastic line in one of my earlier pics. It simply connects the carb spacer to the oil filler neck. Could this be a vacuum leak for me?

I'll have to inspect the manifold some more. Not saying you're wrong, I just can't see any welds.

 

So you don't see any welds in here? 'Cause I do. I bet peejay and j9fd3s can see them too. I don't weld aluminum myself but I've seen enough MIG aluminum welds that I know it when I see it. And this looks like welded aluminum to me. Look harder. I mean really get in there. Pretend your head is a carb. Reach some fingers in there too. Feel the smoothed bumpiness. That's welded aluminum.

 

From the inside I only see a "polished" intake, where the previous owner got a little excited with what appears to have been a dremel. On the under side, I see nothing. I'll have to look and see more, on Thursday morning before I fly.

 

1. Yes, the header is a Racing Beat piece.
2. Check your fuel pump my old RX-7 would pour fuel out of the exhaust like that too. I found out that one of the previous owners put the fuel injection fuel pump on the car. I installed the right one and let the car get upto to temp and no more fuel pouring out of the exhaust or big cloud of white smoke either.
3 From the looks of it you will need a replacement intake manifold for the nikki to work. I have a couple one is emmission deleted the other is still in stock form.

 

You have some pretty experienced guys on here (peejay and Jeff20B) basically telling you what
you have and how to fix it up. Be thankful and take heed. I know the interwebz can be full of
posers but these guys know what they are talking about and are not drift scene wannabes
posting to increase their post count.

This car you've got sounds like its been modded quite a bit. Your probably going to have to redo
or undo a lot of the mods if they weren't done well. Looks like the carb is your first hurdle.

 

Definite signs of welding in there - when you see a series of crescent-shaped waves all aligned at 90 degrees to the line of a seam, that's the tell-tale shape of metal that has been melted by a moving heat source along the seam.

That it started off as a stock manifold is proven by the existence of a blocked-off mounting pad for the ACV (large metal cover on the right side below the carb), and the connection point for the split-air tube (long extension going aft with two-whole flange on it). No after-market manifold would have those features since they are emissions-control related.

Racing Beat manifolds have either their RB logo or the words "Racing Beat" prominently displayed on them, depending on age, and do not include any EmCon features.

 

the circled area is the split air passage, its for emissions so it isn't part of an aftermarket. and yes there also is a big nasty weld between the manifold and flange that doesn't match it at all.

 

Those aren't *too* bad for aluminum welds. It's hard work! But it's pretty obvious they ARE welds.

 

Is there really a question as to whether those are welds? j9fd3s called it exactly as it is in his first post.

Sky is blue, grass is green, that's a stock manifold with an adapter welded to it.

 

If you guys saw the manifold first hand, it wouldn't be so easy to tell. The entire inside of the manifold is dimpled and ground down from a dremel tool, and it all has swirls. I can see how it looks like welds in the pic, but it isn't obvious in person. So now it's time to source a manifold while still tweaking the Holley.

 

I've got one for sale in the First Gen Classifieds, found here:Nikki Pars Galore

 

It has a Mazda part number and it has the bosses for an air control valve and the related plumbing. No aftermarket manifold every did.

 

haha That mani is awsome. LOL

I've tried welding a manifold before (and failed missrably). If this manifold doesn't have any vacuum leaks then I'd keep it if only as a war trophy, maybe even use it latter on.

I just threw out a pair of nickkies and an intake manifold; so a new to you manifold and nikki shouldn't be hard to come by.