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48 IDAs 2.0, 3.0 or 3.3 Needle?
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fl59bug
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PostPosted: Mon Mar 20, 2023 1:44 pm    Post subject: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Hello everyone,

Which needle/inlet valve size should I use on my 48 IDAs which will be feeding Super Pro heads through match ported intakes? The carbs currently have 180 main jets, 200 air jets, 44mm venturies and F2 emulsion tubes.

I fear, perhaps unjustifiably so, that the 2.0s now in the carbs won't be able to keep up with the fuel demand at high rpms.

If I should run 3.0 or 3.3s, where can I purchase these? CB is sold out of 3.3s at the moment.

Thank you

Ted
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madmike
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PostPosted: Mon Mar 20, 2023 2:20 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

I think I had 3.00 in mine , Did ya enlarge the float bowl?
Cheers,Mike
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fl59bug
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PostPosted: Mon Mar 20, 2023 2:26 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Hey Mike, thanks for responding - no the float bowls are completely unmodified and as they came from CB.

Where do I snag a set of those 3.0s? Seems everyone is sold out at present.

Ted
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VeloMikey
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PostPosted: Mon Mar 20, 2023 2:32 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Pierce Manifolds has 3.0 in stock. I would enlarge the float bowls and go with 3.0s.

https://www.piercemanifolds.com/NEEDLE_SEAT_79504_300_p/79504.300.htm
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fl59bug
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PostPosted: Mon Mar 20, 2023 2:47 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

I'll see what I can do about the float bowls Smile I'm limited in my own machining/porting skills, and would have to send them out to someone unless enlarging the bowls is easy.

Thanks for the tip and the link. I'll order up those 3.0s.

These IDAs will be on my 2332 with Super Pros and FK46. I have plans for a 2387 with TF1 case, Wiseco pistons, hogged out AA cylinders, FK89 cam, Street Fighter heads and Geers 51.5s, which already come with the big bowls and 3.3 needles. Until then I'll have to make these 48s work more or less as is.

Ted
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VeloMikey
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PostPosted: Tue Mar 21, 2023 8:04 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Enlarging the float bowls is pretty simple. remove the wall between the bowl and the void and you are good to go.


Image may have been reduced in size. Click image to view fullscreen.

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fl59bug
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PostPosted: Tue Mar 21, 2023 9:16 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

That looks easier than I thought!

I've got the 51.5s on the way and I'll also take the lids off them to see what's going on and use for comparison. Thank you!

Ted
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slalombuggy
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PostPosted: Tue Mar 21, 2023 11:26 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

3.0s will be plenty, they kept my 51s with enlarged float bowls fed over the mile. I did have one fail though, something inside fell apart, original weber part.

brad
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fl59bug
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PostPosted: Tue Mar 21, 2023 12:17 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Thanks Brad, the 3.0s are on their way.

Ted
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King_vw61
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PostPosted: Tue Mar 21, 2023 6:00 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

3.0's and a good fuel pump and regulator. The 3.0's don't like any more than 3.5psi just like the 2.0's

I keep it under 3psi and -8 line to the reg. -6 would be plenty,
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stealth67vw
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PostPosted: Tue Mar 21, 2023 9:25 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

I have been 12.30s at 108mph in my 2000 pound atreet car with 2.0s. 2276cc with Web 86C, Super Pro heads, 11.4:1 compression. I have 3.0s to install before race season starts this year.
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fl59bug
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PostPosted: Wed Mar 22, 2023 7:11 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

King_vw61 wrote:
3.0's and a good fuel pump and regulator. The 3.0's don't like any more than 3.5psi just like the 2.0's

I keep it under 3psi and -8 line to the reg. -6 would be plenty,


Thanks. I still need to work out the fuel system overall. I am so far planning on using a Holley Red into an Aeromotive 13222 1.5 - 5 psi regulator. I'll make sure to keep the pressure to under 3psi as you mentioned.

Ted
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fl59bug
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PostPosted: Wed Mar 22, 2023 7:17 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

stealth67vw wrote:
I have been 12.30s at 108mph in my 2000 pound atreet car with 2.0s. 2276cc with Web 86C, Super Pro heads, 11.4:1 compression. I have 3.0s to install before race season starts this year.


This is good real-world usage information, thank you. Are you using an AFR gauge and if so does it show any leanness at the top end of the track when using the 2.0?

Also, going slightly off topic, are you using drag radials and is your car still using the 4 speed or a Berg 5 speed? I ask so I can plan my driveline when the time comes. Your combo sounds fast for sure.

Ted
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Dauz
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PostPosted: Wed Mar 22, 2023 12:59 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

No more "fi"59bug?
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fl59bug
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PostPosted: Wed Mar 22, 2023 1:23 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Hm, maybe not lol Very Happy No fuel injection "fi" or Florida "fl" for me these days. I'm actually more of an "nc59bug" these days haha.

Next chance for going "fi" will be one day when I crank out a turbo setup. Betting though it'll still be carbureted, likely with a 45 DCOE in my collection!

Ted
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stealth67vw
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PostPosted: Thu Mar 23, 2023 9:53 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

fl59bug wrote:
stealth67vw wrote:
I have been 12.30s at 108mph in my 2000 pound atreet car with 2.0s. 2276cc with Web 86C, Super Pro heads, 11.4:1 compression. I have 3.0s to install before race season starts this year.


This is good real-world usage information, thank you. Are you using an AFR gauge and if so does it show any leanness at the top end of the track when using the 2.0?

Also, going slightly off topic, are you using drag radials and is your car still using the 4 speed or a Berg 5 speed? I ask so I can plan my driveline when the time comes. Your combo sounds fast for sure.

Ted
I have an AEM AFR gauge but I can't see it going down the track. The plugs don't show it going lean. I have the float bowls opened up and run a return style pressure regulator with 3/8" feed and return lines.
Image may have been reduced in size. Click image to view fullscreen.


I'm running 215/65 M&H DOT bias ply street/strip tires and a standard 4 speed with 4.12 ring and pinion, 3.78 mainshaft ,1.48 3rd and 1.04 4th. A 5 speed would be nice if I drove it on the street more. I have a Berg IRS bus 5 speed that I was going to put in my bug, but it is going into another project.
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12.34 and 108.10 mph 1/4 mile
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Ohio Tom
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PostPosted: Fri Mar 24, 2023 4:34 pm    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

I have found that 3.0's have a hard time holding back more than 3.5psi.
I frequently set the floats 1mm lower to help control them.
Still, they can be finicky. Have a switch on the fuel pump so you can shut it off if she starts to load up from idling too long...
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fl59bug
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PostPosted: Sat Mar 25, 2023 9:53 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

Thanks Tom. When I wire up that Holley Red and Aeromotive 1.5 - 6 psi regulator I'll still use my Revolution Electronics controller but will also install the manual shut off switch you mentioned.

I received the 3.0 needles and will install them in these 48s. These carbs still need me to enlarge the float bowl ala what VeloMikey, stealth67vw and others have done.

Ted
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fl59bug
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PostPosted: Sat Mar 25, 2023 9:55 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

stealth67vw wrote:
fl59bug wrote:
stealth67vw wrote:
I have been 12.30s at 108mph in my 2000 pound atreet car with 2.0s. 2276cc with Web 86C, Super Pro heads, 11.4:1 compression. I have 3.0s to install before race season starts this year.


This is good real-world usage information, thank you. Are you using an AFR gauge and if so does it show any leanness at the top end of the track when using the 2.0?

Also, going slightly off topic, are you using drag radials and is your car still using the 4 speed or a Berg 5 speed? I ask so I can plan my driveline when the time comes. Your combo sounds fast for sure.

Ted
I have an AEM AFR gauge but I can't see it going down the track. The plugs don't show it going lean. I have the float bowls opened up and run a return style pressure regulator with 3/8" feed and return lines.
Image may have been reduced in size. Click image to view fullscreen.


I'm running 215/65 M&H DOT bias ply street/strip tires and a standard 4 speed with 4.12 ring and pinion, 3.78 mainshaft ,1.48 3rd and 1.04 4th. A 5 speed would be nice if I drove it on the street more. I have a Berg IRS bus 5 speed that I was going to put in my bug, but it is going into another project.


Stealth with what cutter tool did you make that nice tidy incision in the float bowl? I like that.

Ted
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slalombuggy
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PostPosted: Sun Mar 26, 2023 11:11 am    Post subject: Re: 48 IDAs 2.0, 3.0 or 3.3 Needle? Reply with quote

I ended up using a holley blue pump and a Mallpasi bypass regulator from CB. The regulator has 4 fittings, an in, a return and 2 outlets. I used it a a "T" and ran one outlet to each carb. I used -6AN for the entire system including the return.
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