FS Weber 48 IDA carbs

I'm interested in these as well. Seeing you took them off the 2110. 

Will these not work in our speedster? Someone please chime in?

No actual experience, but they are physically larger than the IDF series carbs..  Read that: taller and wider...  Air cleaner clearance could be a problem...  Just a thought... 

Leon,

So what's the largest IDF we can run in our cars that will fit?

Leon and Scott- IIrc, with Berg's short IDA manifolds they barely fit with the stock airhorns when I mocked up the engine compartment. Guys, for a 2 liter, the venturis are probably 37mm, not 27mm. They're neat carbs (and as Leon said, larger, so more imposing) but you can make as much power (and have better floats for cornering) with IDF's or Del's, and you'll have room for aircleaners (a bonus if you want the engine to last a lont time). And any thing less than the 37mm vents in the IDA's and you may encounter tuning difficulties. 

I've got a pair of new in box Italian IDA's (never had gas in them) in the garage that I'll let go for $2500 if anybody's interested...

I also read somewhere on this form that the 48IDAs are not great for street use, IDFs are?

If the engine is big enough to use them and they're drilled with the 3rd progression hole and they're tuned properly then they can run well, but the IDF's/Del's have a better float system. Lots of guys in the Cal Look beetle world swear by them, but a lot of those cars are not street driven like most Speedsters are.

ALB,

They would be for a 2110 Ruf911 is selling. Looks to have removed a lot from what was suggested here and selling separately. I've contacted him offline to get the story and specifics. Trying to sort the engine now. He also has a set of 44IDFs that I think would work better. Please let me know what you think.

Scott- You'll get better mileage, better overall (throughout the rpm range) power and the 44IDF's may even be easier to tune. Dual carbs sized too large for the engine sometimes have an impossible to tune out rich midrange (which makes mileage not quite as great as it could be). Is that the same 2110

https://www.speedsterowners.com...-a-generic-core-swap he had for sale 2 weeks ago? I'm guessing it will make 150 or so hp, so the 44's would be a much better fit than the IDA's. For that matter, you could make 40's work on it- Gerico on the Samba built a 2276, 40x35 heads, W120/1.25, 9:1, 40 IDF's that dynoed at 158hp @6,000rpm and had 140 lbs. of torque from 2500-5500rpm. 

How much of the engine are you looking at?

And just call me Al (come on, you know the tune...)

IDFs are the WEBER series for the average enthusiast...  Dels are rarer but are also usable...

I was able to round up a complete set of type 1 cooling tins and doghouse. The motor also has a thermostat controlled external oil cooler and deep sump. 

I open checked the venturi on the 48s and they are 37mm. About right I guess at 3mm smaller than the intake valve.

Scott, 44s would be the way to go.

The motor is sold but the carbs..the 48 IDA webers are available. 

Scott came out today and we struck a deal. He went with the 44 IDF Webers. 

Thanks for all the input that you guys offered. I will be helping Scott install this motor in his Speedster at my house. I am not well versed in replica speedsters and because we will need to purchase some peripheral components to finish the build your input will be valued and appreciated.

The topics and peripherals in question at this point are:

The external oil cooler and how it should be/can be used with a stock cooler in a replica speedster application?

Best manifolds and air cleaners to offer good clearance and charge transfer for a replica engine bay? 

I will likely open a new thread in the appropriate forum here but this should get the ball rolling

do you have the linkage too?

they look like none Italian carbs right?

would you take $400 shipped to san diego 92154?

Ruf & Scott- I don't think CB's big beef manifolds will fit with air cleaners; you'll need something shorter. When I mocked mine up with the Berg IDF manifolds and 48 IDF's, the 3 1/2" tall oval K&N aircleaners barely fit. Mount the full flow filter in the left rear fender well (like in a beetle) and plumb the cooler (along with a thermostat, or oil temps will almost always be too cold; the engine needs to warm up as quickly as possible or more wear happens) in the return line. It can be mounted over the transaxle (with a fan). The thermostat for the fan should be in the oil line after the cooler; you only want the fan coming on when the cooler needs help keeping the oil temp within reason. That way it's not running all the time. I've also seen the cooler attached down low on the torsion bar tube (on the left side). Of course, keep the doghouse cooler.

Make sure the engine compartment is sealed up at the back and sides, so spent cooling air and radiated heat from the exhaust can't enter the engine compartment. Some guys have used the "H" profile, bus rear seal. All the sled tins and back lower tins that attach to the cylinder shrouds will need to be in place. Of course, all this isn't worth 2 craps if the cooling system can't get enough air (the engine CAN NOT draw enough air in through the deck lid grille at highway speeds and WILL RUN HOT), so make sure there is a 6 or 7" hole in the firewall in front of the fan.

PS- With a big engine I would oval the hole 2 or 3", as that adds 12- 20 sq. in. of air intake.

Hope this helps. Al  

Hey Al, I got the 44 IDFs. Are they any smaller?

I don't think so (but don't hold me to it); they all use the same base bolt pattern, and I believe the same air cleaners fit all 3. 

Sorry, I meant the height of the 44 carb compared to the 48. The 44 being shorter?

The 48's are larger in all respects. 

Air cleaners fit because at the top of the carb (intake) the hole in the air cleaner base plate can be larger than the intake also the hole for mounting the plate are elongate in shape. The the intake manifold and carb charge exit (bottom) should be identical in diameter offering thermal consistency for the charge path. 

I ran 48 IDA's on my speedster awhile back, but without air cleaners. The smaller 44's and 40's will fit without issues.

Ok. So thinking the 44s will fit without issue with big beef manifolds and 3 or 3 1/4" filters? Of would I need shorter manifolds? The intakes are ported, so I'm not sure if that limits or effects choices in manifold selections.

BTW, great looking engine bay and engine!

I think it depends on the manufacturer and whether the car is pan based or custom framed. I'll check later (I'm only home for a moment), but iIrc, with Scat track manifolds (tall like Coolryde's) the airhorns on my IDA's hit the body lip that the engine lid fit into. I could also give you outside measurements of the 48IDF's I have to see how they compare to your 44's. I should have results by dinner time or so (Pacific). Al 

Thanks Al. I have a pan based 1969 CMC.

Here are some pics of 44 IDF and 48 IDA to show the size differences. 

Ruf911,

Did you get my dialog? I'm interested in the 48s. Are they for sale? Or?

48 IDA's in the ad above are sold. 

I was looking through some stuff here and have a set of four NIB 48 IDA Webers with sequential serial numbers and another set of four used 48's with sequential serial numbers which are the previous four numbers to the new set. 

They came on/with a factory prepped 1960 SWB 250 GT that we owned a ways back (before I was born). 

I will sell these for the right price. 

nice what kind of numbers are we talking about?

Not sure off hand but a quick check of current market for early Ferrari Weber carbs is how I arrived at these numbers.

$8000 for the new ones and $6000 for the used ones. 

Ok, thanks Al. Yes I also have the 6 inch hole already in front of the fan shroud.

Scott- I was going to mock up and take pics of the carbs and manifolds sitting in my engine bay, but I have work (and a deadline) at the moment so it's long hours 'till Friday. What I did manage to do- an IDA is 5" tall + the 2 1/4" air horns, and they're 8 1/2" wide at the throttle shafts. The 48IDF's are 4" tall + 2 1/4" air horns and 7 1/2" wide at the throttle shafts. The Scat-track manifolds (they look like the ones in Kevin's pic of his engine with the IDA's and no aircleaners) are 7" tall. I went as far as buying Berg's short IDA manifolds (GB 587), trying to get air cleaners under the deck lid before deciding on using the IDF's. The IDF manifolds (GB 580A) are 4" tall.

I believe all the IDF's (40, 44 and 48) are the same exterior dimensions; they all have the same bolt pattern, so if someone with either of the smaller carbs could do a height and throttle shaft length measurement, it would be appreciated. Al 

Al-Thanks for all the effort. No worries though. I measured height clearance in my CMC of my current (1600 single) intakes to the roof and looks like 12 inches give or take. I may try an offset manifold pair (instead of tall) with 3 1/2 air cleaners to start. If it doesn't fit, I'll try shorter cleaners and remeasure once all is in—instead of all this guessing. Either way, I will report back what will fit at least with my set-up.

I just wanted to ask since I couldn't find a specific answer under the search function, and a few of us are running 2110s or larger with no complaints of clearance issues (other then stated). Ruf911 is helping with the assemble and install, and he's got a lot of odds and ends in is shop to probably make things fit—Really nice guy. If anyone else chimes in, I have 44 IDFs going on a 2110, installing in a CMC-panbased. Thanks again Al.