Weber 34 ADM Tuning ? and Header Mod ?? - for Mild 221

[Danielson]

Well I am getting close to fitting the 34 ADM and 2 & 1/2 inch exhaust to the old XW. Can anyone point me in the right direction for jetting the weber on a mild 221 (308 inlets and a 25 / 65 cam I think). It currently has standard XF 4.1 jets. I will be making my own adapter and mounting the carb across the manifold so as both barrels are at the centre of the inlet. I hope to line up the primary so it will have the most direct flow and have secondary angle flowed into the inlet. I will also open up the inlet as much as possible for best flow. I also thought of making a wedge that sits directly below the inlet to help direct the flow down the log to either end. Anyone had experience with this :

If I move the Y section on the Pacemaker extractors a bit closer toward the engine when fitting the 2.5 exhaust will it alter the performance in top, bottom or mid power? The last 8 inchs of the headers are a bit rusty as is the Y shape 2 to 1 collector so I was thinking of having it shortened, but not if it has a negative effect..
Thanks all
Regards Daniel

 

[xctasy]

As long as you can fit the Weber adm 34 there, you can put it in wherever you like. I've seen people mount them like they do on the X-flow, or on a 45 degree angle, or at 90 degrees. The Weber float bowl doesn't mind where you put it, as its unhurt by cornering loads. Do what seams right to you, Danielson. Just make sure the idel stop solinod has 7 volts, and the electric choke has 12, and if you decide to go away from the stock set-up, your on your own. There is a K&N filter that the Fait 124/131/132 guys use for there Weber 32ADF which will fit your carb.

A fact few people notice is that the 3.3 and 4.1 versions had the same jetting, but different idle settings. When you dump it on a hotter 3.6, your not going to get much more more than a 4.1 x-flow carby or EFI for power. 140 hp is likely from the ADM 34 if its tuned well.

Guys who put ADM 34's on there 3.3 and 202 Holdens find that carb is as faster than the stock 1 or 2-bbl carbs, and certaily as good as the Holley 350. It's far an away much more economical than any other 2-bbl carb you care to name.

Fit up your good carb, good electronics, and when you've got it running, then take it a garage, and check the cold and warm Co2 readings are in spec. If the idle and wide open throttle readings are out of spec for an XE Falcon, then you have to break the lead plugs to rest them, and then push some amalgam 'filler' back in afterwards. It's best done by a garage with a CO2 meter.


Meantime, use the carb as it is, and only do changes with a gas anaylser. No tuning by Braile, okay mate?

 

[Danielson]

Here is my jetting so far. The pilot jet has been drilled to a .7mm so it is the same in both secondary and primary piolt jets. Th primary main has been drilled to 1.45 from 1.35 and pri aircorrection jet is 160, secondary is 220 main and 180 air correction.
This seem to run and go quite well .. much better than the standard jetting. I think the secondary is still on the rich side but need more advanced tuning from now..
Cheers Daniel