Weber 4-48 IDA How well do they work ?

[Cobragreg]

I'm thinking on changing over to the Weber 4-48 IDA set up . I talked with Jim Inglese about what would be needed . I will have to change the camshaft the one in the engine has 110 LSA . He said that it needed to be 112 LSA or greater for the engine to preform properly The biggest enemy of the 8-stack engine is what’s called “reversion”. This happens when the incoming air columns are disturbed by reverse-flowing pulse waves sent back into the intake manifold from the cylinders because the valves are opening and closing at the wrong time in relation to piston movement. This is the result of using an incorrect cam in an engine with an independent runner (non-plenum) manifold. This disturbance to the incoming airflow results in lost horsepower. So what I'm asking just dependable is this set up ?? It would cost over 5K to change over .The looks of the Webers is amazing and so is the performance form what I have been told . THe engine in my Mark3 is 427 windsor that I built was dyno at 560 HP at 6800 RPM and torque is 500 at 4800 RPM . Thanks for any tips and advise ,Greg.

[cob427sc]

I've run Webers on various engines and they are a little finicky to set up but once they are dialed in, run great. In this day and age, why not go with a eight stack injection system, computer controlled? Eliminates all the setup issues and will perform better in the long haul. I've seen webers converted over for injection, so they look like carbs but run through the computer controlled system.

[Derald Rice]

I have 4 x 48 weber IDF's on a 347. Originally installed in 2008, they were on a 302, then they moved over to the current 347.

The IDA's are a bit harder to setup do to the lack of a transition circuit, so unless you really want the IDA's, the IDF"S might be another option.

As to the cam, I am running a Comp Cam weber grind with 115 LSA. There is very minimal reversion, it idles great and will stand up and talk when pushed. Cam # is 31-490-8, I can forward the specs to you if you wish, don't think it is in their current catalog, it wasn't listed in 2017.

And some other things to consider are the linkage, timing, and filters.

Derald.

[Cobragreg]

I though about going that way with injection . There's a lot to change and wiring to add . When I talked with Jim he said that they dial in the carbs and it comes already assembled and ready to install . I have to change the cam which isn't that big of a deal .. I also will have to send them my new cam specs. He told he that 112 LSA was good to use.

[Cobragreg]

Thanks for the info . If you could send the cam specs. That will give some idea on what way I'm going as far as the cam . The engine is a 427 windsor That I built . I take it that the cam specs are for the 347 ? When I talked with Jim Inglese he said that the weber carbs are more bang for the buck , with a lot less work than the stacked injection .. I'm not getting any younger and I really don't have to do all the work of installing the ECU, wiring ,new fuel lines and filters and the intank pump . Maybe I'm getting lazy in my old age .. Thanks again Greg