40 IDA WEBER

Since the re-introduction of the 40 anyone out there ventured on
a dual twin barrel for your VS?. I was told this wont work because
the engine lid clearance wont have enough room to accomadate the
carb. Is it recomended to marry this with a 1776, or the 40 is a
bit to much for the engine output. anyone ? txs.

John, 40 IDA's are 3-barrel carburetors for Porsche 911's. Years ago there were dual throat 46 IDA's, but these are rather rare.

The recent production re-startup is for dual throat 48 IDA's, and these are being made in Spain, not Italy. In my experience the Spanish carb quality is not up to the original Italian carbs but they are usable.

If you use SHORT manifolds the 48 IDA's would probably fit in a pan-based replica's engine compartment but air cleaners might not and velocity stcks might have to be trimmed.

The newer tube framed Intermeccanicas can probably use dual 48 IDA's as the engine sits farther forward which will provide a bit more room for them, stacks, and air filters.

For a street car Weber 48 IDF's (still manufactured) and Dellorto 48 DRLA's (no longer made) are a better choice.

For anything but an EXTREME 1,776cc engine build Weber 40 IDF's will be a very good choice.

(Message Edited 4/18/2003 1:29:37 PM)

Aloha,

Carb selection will depend on a lot more than just displacement. You have to match them with your valvetrain, heads (and headwork) and cam.

George is right, you must be talking about the 48 IDA. You could run them on a 1776cc engine, but be prepared to only use your Speedster for drag racing. IDA's are finicky carbs for the street (I know). They are either at idle, or at WOT...nowhere between.

For your engine, you might be able to get away with a nice set of Kadrons or the 46IDK Kadron setup from AJ Simms (very trick setup...too cool).

alohas,
Joel

Joel, the main problem for street operation with 48 IDA's is the limited transition phase - they are kinda sorta ON/OFF (idle/WOT). They can be made street-friendly by having an additional transition port drilled in the carb throat.

Art Thraen performs this mod - I'm sending him a pair of NOS early Italian 48 IDA's to modify and will use them on my new 2,387cc engine if I can find a nice pair of short intake manifolds. CB Performance has a hex-bar linkage setup with the cast K&N air filter box tops/bottoms.

You could put 48 IDA's on a 1,776 engine but you would have to choke them down with 32mm venturis and jet accordingly (these small vents were used by people who put 48 IDA's on Porsche 1,600cc Super 90 engines; Scat made an adapter to use the IDA's on Porsche intake manifolds). I just sold a NOS set of these Scat adapters to a guy in Hawaii that's putting some IDA's on his Porsche 356.

I have a new set of 32mm venturis if anyone needs them.

(Message Edited 4/18/2003 3:09:29 PM)

Guys, he is probably asking about weber 40 IDF's. I have those on my stroker 1885. The chassis is ready , but the body was found in a field, where it sat for almost 10 years. I'm repairing stress cracks, rust, and, birds nests. George you may re-address the 40 IDF issue.

George,

True about the progression circuits. Art Thraen is definitely the man to contact when you need that 3rd hole drilled and want a beautiful set of carbs in return.

Personally, I'm sick of carbs. Any ACVW or ACVW-based car I get myself into in the future is going to be FI.

alohas,
Joel

PS - They have always manufactured 40 IDF's. Perhaps, they have recently begun reproduction on another Weber series? DCNF?

I've got a set of Gene Berg 44 DCNF and as far as I know Gene Berg is still selling DCNF 42 'Specials'. I can't understand why anyone would purchase 48 IDAs over 48 IDFs for a street car. Up here IDAs are $700 more without air cleaners (the IDFs come with cleaners). Maybe it's just so they can, say that they're running IDAs, which seems to be a drag racer's mantra.
Ron

thanks guys,

yes it was 48 IDA