Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

large down-drafts--weber--other?


Recommended Posts

I see that WEBER makes some rather large downdraft carbs...do any of those fit our car?

That is do any fit the 38/38 intake...or is there another mani to match the larger downdrafts?

Someone pointed out a 40x2 WEBER downdraft to me and that got me thinking..."what if?"

Jack be nimble - Jack be quick

If Jack isn't, he's gonna get his ass burned!

Link to comment
Share on other sites

t'anks mang!!

It looks to be a "hard to find" item in the rarer-than-practical catagory.

I guess I'll let the latest parts settle in a bit, then get that single side-draft from IE. wo0t!

Jack be nimble - Jack be quick

If Jack isn't, he's gonna get his ass burned!

Link to comment
Share on other sites

I have a 40mm weber downdraft with spare air correctors and mains I got it from greenfield years ago

74' malaga automatic 2002, ST 22mm & 19mm sways, Bilstein HD H&R Racing Springs, 40/40 weber, Petronix ignition, 320i Radiator, urethane, Ireland big brake for front and rear, Kevlar race pads.

Link to comment
Share on other sites

Well, there are Holley manifolds for sixes-

but honestly, mon amis, the 38/38 on a plenum manifold

is a LOT of carb for a 2L engine.

Think about it- 45mm DCOE Webers are the biggest anyone puts on anything

less than a full race motor. That's a little less than 1600 square mm of

area to draw air through.

Even a 50 DCOE has around 2000 mm2 of area per cylinder.

When you open both those 38mm throats, that's 2200 mm2 of area.

Yeah, there's more available flow area in a single 38/38 per cylinder than

in a quad of 45's. Really.

So flow restriction kind of falls out of the equation really quickly.

Now, obviously, there are other things to worry about than sheer area,

and having had both DCOE's and a 38/38, the DCOEs work better

if you know what you're doing... but

I guess

what I'm trying to say is that just tossing a bigger carb onto a distrbuted

manifold isn't going to net you much power,

and will certainly mess up a lot of other things like idle and lower-

speed torque and mixture control...

Looking at the numbers again, well, huh, I can see why the 40/40

could be a real choice for a rules- limited racing motor.

Except, so far, no- one's really made it work...


"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

  • Create New...