[X72GPX]

Yes, still chasing burning eyes and fuel smell from exhaust.
Primary screws work, adjusted the "windows" on primary and secondary transfer slot with carb off the car.

Here is a pic of my secondary metering block, does anyone see something that might be either restricting the idle circuit or where fuel might be pouring into the carb at idle from another circuit?

Thank you

[X72GPX]

And....Happy Fourth of July!!!!!!

[STEELCITYFIREBIRD]

PV plug gasket?
Needle and seat assembly ORings …
or condition of fuel bowl where they seal?

[25stevem]

Look for marks on the throttle body of the carb where any of the 6 corners of the PV plug might be hitting which would effect metering block gasket sealing.

This does happen at times and if so grind on the plug.

[Scott65]

Secondary float level correct? If everything is correct, and you can bottom out the mixture screws without leaning, it is not uncommon to have to restrict the idle circuit.
ETA:
Or very carefully open the idle air bleeds. You'll need the ability (proper drill set) to do .001" increments for this method. And the knowledge to know and recognize the effects.

[TCSGTO]

Originally Posted by X72GPX

Yes, still chasing burning eyes and fuel smell from exhaust.
Primary screws work, adjusted the "windows" on primary and secondary transfer slot with carb off the car.

Here is a pic of my secondary metering block, does anyone see something that might be either restricting the idle circuit or where fuel might be pouring into the carb at idle from another circuit?

Thank you

When you say adjust windows did you do the secondary also? If so undo it and only open the secondary plates 1/4 turn past closed to keep them from sticking. Try that and readjust the mixture screws before you change any parts.

[TCSGTO]

Originally Posted by 25stevem

Look for marks on the throttle body of the carb where any of the 6 corners of the PV plug might be hitting which would effect metering block gasket sealing.

This does happen at times and if so grind on the plug.

+1 Make sure the PV gasket is seated also

[Tom Vaught]

Originally Posted by TCSGTO

When you say adjust windows did you do the secondary also? If so undo it and only open the secondary plates 1/4 turn past closed to keep them from sticking. Try that and readjust the mixture screws before you change any parts.

X2

Tom V.

[Tom Vaught]

Next time you feel like it take the base plate off the carb and post up a picture showing the throttle blades (minus main body gasket) so I can see if the 4 corner idle circuits are even there.

Tom V.

[Formulas]

also a lean mixture will not burn clean and give the impression of rich with stank exhaust

[shaker455]

Originally Posted by Tom Vaught

Next time you feel like it take the base plate off the carb and post up a picture showing the throttle blades (minus main body gasket) so I can see if the 4 corner idle circuits are even there.

Tom V.

X2

[X72GPX]

Thanks Tom, here they are:





ATTACH]593977[/ATTACH]

Attachment 593978

Attachment 593979

Attachment 593981

Originally Posted by Tom Vaught

Next time you feel like it take the base plate off the carb and post up a picture showing the throttle blades (minus main body gasket) so I can see if the 4 corner idle circuits are even there.

Tom V.

[X72GPX]

I tightened the secondary adjuster screw under the base plate and backed it off 1/4 turn, now there should be no transfer slot showing on the secondaries, is that ok? I thought we needed .40 window showing.

Originally Posted by TCSGTO

When you say adjust windows did you do the secondary also? If so undo it and only open the secondary plates 1/4 turn past closed to keep them from sticking. Try that and readjust the mixture screws before you change any parts.

[TCSGTO]

Originally Posted by X72GPX

I tightened the secondary adjuster screw under the base plate and backed it off 1/4 turn, now there should be no transfer slot showing on the secondaries, is that ok? I thought we needed .40 window showing.

Yes, the secondary slot should not be exposed at idle. Primaries only should be set “square” and the secondaries adjusted to 1/4 turn for a baseline.

If you need to change the idle speed you can make minor adjustments using the secondaries up to a point and leave the primary plates alone. But if the secondary transfer slots get exposed at idle it can cause all kinds of off idle/part throttle drive ability issues.

[25stevem]

Your secondary idle circuit holes are there, how about in the gasket being used?

Note, some very small amount of idle air should be passing thru the secondary’s throttle blades , maybe to the tune of being able to bring up the idle rpm by like 50, which if the carbs air bleeds are sized good for the motor will allow that added 50 rpm to be backed out of the primary without making for a off idle stumble.

Sorry for the run on sentence!

[X72GPX]

Yes, gasket has holes for idle circuit.

Thank you

[X72GPX]

Can you tell me if what seems like someone took a screwdriver and punched this hole in the secondary main body? Should that gash be there?

Originally Posted by X72GPX

Thanks Tom, here they are:





ATTACH]593977[/ATTACH]

Attachment 593978

Attachment 593979

Attachment 593981

[25stevem]

Does that pass thru all the way into one of the throttle bores?
It's hard to tell from the photo!

The answer is no, there should be no hole from the power valve recess cave into the throttle Bore.

[Tom Vaught]

Originally Posted by X72GPX

I tightened the secondary adjuster screw under the base plate and backed it off 1/4 turn, now there should be no transfer slot showing on the secondaries, is that ok? I thought we needed .40 window showing.

Maybe just a typo but the dimension under the Primary blade and Transfer Slot is .040" not .400. The secondary blades can typically be the same or LESS
to get the idle speed you want. I normally start with the blades a few thousands of a inch from seated.

The "smashed in" casting "modification" says the carb was touched by a real "hack job" person and that "modification" needs to be filled with Devcon or a similar material to repair that mess. But it might not be repairable if there are other "unseen" similar mods.

Tom V.

[X72GPX]

Yes Tom sorry, meant .040. I sprayed carb cleaner into the smashed hole and it sprayed out the bottom. So that's amazing- that has to be my problem, and to your point, hopefully the only one.
Should I try this?

https://www.jbweld.com/product/tankweld

Thank you all