Four WEBER IDA 48mm best Power!!!!

[Luger]

For my ULTIMA GTR , the system WEBER IDA 48mm ....is a good idea?

Who mounts these carburetors, as they go?power is good?

I Love the LOLA T70 mk3!!!!

[Thevet]

Hi Luger,have a look at the following link to see a set of downdraught carbs on an SBC. Advertised power was 430hp but the guy who bought it has had it dynoed at nearly 550hp.http://www.britishamericanengines.co.uk/chevy_ultimates.asp 

Edited by Thevet on Monday 28th May 19:51

[P15TON]

I have done a lot of testing of SBC's including 48 IDA's against Single Holley on all types & sizes, and I can state quite confidently that IDA's will knock a load of power off any decent SB Chevy.

However, they do look great.

[Luger]

Single Holley with Victor JR is better?????

P15TON said:

I have done a lot of testing of SBC's including 48 IDA's against Single Holley on all types & sizes, and I can state quite confidently that IDA's will knock a load of power off any decent SB Chevy.

However, they do look great.

[GTRCLIVE]

Luger said:

Single Holley with Victor JR is better?????

P15TON said:

I have done a lot of testing of SBC's including 48 IDA's against Single Holley on all types & sizes, and I can state quite confidently that IDA's will knock a load of power off any decent SB Chevy.

However, they do look great.

He's the man.. trust what he say's, he does that s""" for aliving..... but pitty about that large wort on his nose....

[k wright]

I've seen others that state that webers were a good thing if appropriatly tuned.

That being said the expense of four webers and a manifold is near that of efi so it is a no-brainer unless you absolutely don't want a computer on your car.

ken

[P15TON]

Luger said:

Single Holley with Victor JR is better?????

P15TON said:

I have done a lot of testing of SBC's including 48 IDA's against Single Holley on all types & sizes, and I can state quite confidently that IDA's will knock a load of power off any decent SB Chevy.

However, they do look great.

Victor Jr & single Holley, we've seen 620bhp plus using this on a racing 377, a change to 48 IDA's using 42, and even 45mm chokes knocked it down to 530bhp.
This is a typical loss on a really stonking engine. On a mild engine, say 400ish, you might even see a gain using IDA's. The fact is that a 48mm throttle body will not pass much air. Graphs overlaid showed power equal to the Holley up to 4100rpm with the 42mm chokes, and 4400rpm with the 45mm chokes, then the Holley pulls away by a big margin. Most of the EFI Kinsler stuff we use is around 65mm per cylinder, which sees no drop of cfm when tested on the cylinder head on a flow bench.

Edited by P15TON on Friday 1st June 17:09

[P15TON]

GTRCLIVE said:

Luger said:

Single Holley with Victor JR is better?????

P15TON said:

I have done a lot of testing of SBC's including 48 IDA's against Single Holley on all types & sizes, and I can state quite confidently that IDA's will knock a load of power off any decent SB Chevy.

However, they do look great.

He's the man.. trust what he say's, he does that s""" for aliving..... but pitty about that large wort on his nose....

That large wart IS my nose!

[k wright]

The Holley has 4 venturis versus 8 for the Webers, what size are the venturis on the 850 Holley?

[P15TON]

OK, the Holley has 1.75" throttle bores, but the intake has a PLENUM CHAMBER which allows ALL EIGHT cylinders to draw from all four thottle bores, ie 850 cfm of air. Individual runner manifolds only allow each cylinder to draw on the respective throttle, in this case 1 x 48mm.

[k wright]

Great point. Ideally what would the diameter of an individual throttle body be for a...377 V8?

[P15TON]

k wright said:

Great point. Ideally what would the diameter of an individual throttle body be for a...377 V8?

How powerful, and at what RPM? Thanks

[GTWayne]

^ As much as you can get and all of them of course

[k wright]

P15TON said:

k wright said:

Great point. Ideally what would the diameter of an individual throttle body be for a...377 V8?

How powerful, and at what RPM? Thanks

7500 rpm redline, max power at 6500, 542 Hp. What formula are you using to figure this?

ken

Edited by k wright on Friday 8th June 17:20

[P15TON]

k wright said:

P15TON said:

k wright said:

Great point. Ideally what would the diameter of an individual throttle body be for a...377 V8?

How powerful, and at what RPM? Thanks

7500 rpm redline, max power at 6500, 542 Hp. What formula are you using to figure this?

ken

Edited by k wright on Friday 8th June 17:20

Around 55-57mm if you're doing a lot of road use.

Figured using 'The Formula of life!'

[Steve_D]

P15TON said:

.....Figured using 'The Formula of life!'

That'll be 42 then.

Steve

[jacko460c]

Who mentioned noses?














(That'll confuse 'em)

[YIIHAA]

P15TON said:

I have done a lot of testing of SBC's

So Holley or Edelbrock (Weber)? I know that AS seemed to get better BHP figures (not that that makes a better engine) from the Edelbrock all other things being equal(on the same dyno), but my own view is that the Edelbrock carbs are a PITA because of the fact you need sets of metering rods to change the mixture.

[P15TON]

YIIHAA said:

P15TON said:

I have done a lot of testing of SBC's

So Holley or Edelbrock (Weber)? I know that AS seemed to get better BHP figures (not that that makes a better engine) from the Edelbrock all other things being equal(on the same dyno), but my own view is that the Edelbrock carbs are a PITA because of the fact you need sets of metering rods to change the mixture.

Eh.....?

I think you're confusing italian Weber 48 IDA twin chokes with those sad chrome plated 1950's Carter AFB replica pieces of sh*t that Edelbrock / Weber USA sell.

[YIIHAA]

P15TON said:

Eh.....?

I think you're confusing italian Weber 48 IDA twin chokes with those sad chrome plated 1950's Carter AFB replica pieces of sh*t that Edelbrock / Weber USA sell.

Not confusing them at all, I was asking you a question, as you said you knew about such things. I have one of those "piece of sh*t" carbs that you mention. I've often wondered if I should change to a Holley as they seem easier to set up and more people are familiar with them. But at the time the Edelbrock 800CFM carbs being fitted by AS were getting better dyno figures than Holley carbs (back to back with identical setup).