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large down-drafts--weber--other?


Green2k2

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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!

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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!

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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.

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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...

t

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

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