Loud air sucking noise on acceleration

[Asshat]

Did the 63 c10 and c20 have oil bath air cleaners?

And, if I installed one, do you guys think it will quiet it down?

[Steeveedee]

Originally Posted by Asshat

Did the 63 c10 and c20 have oil bath air cleaners?

And, if I installed one, do you guys think it will quiet it down?

Doesn't sound all that bad, like Christian says. Play it again, this time with the air cleaner housing installed. I can understand all the second guessing you may be doing, with all the trials you have had. You are driving it around with the air cleaner on it, right?

Oil bath air cleaners are old school, but some of the vehicles even newer than yours had them. I'm not convinced that they are quieter, but it's been decades since I've worked on a vehicle with an oil bath air cleaner. To be honest, I was only interested in making the vehicle run well, and the noise (beyond some obvious mechanical problem that needed fixing) was a secondary issue.

Also, there is a lot more valve train noise than I would expect in a rebuilt engine. What was your method for adjusting the valve lash? Is it a mechanical lifter setup? I'm not inclined to go looking for the old threads, right now.

[88Stanger]

Originally Posted by Asshat

It’s definitely 14 bolt, yours is 12 bolt because it’s 1/2 ton; mine is 3/4 ton, 8 lugs.

Oh damn, im sorry, i did not see that. my apologies. Looking clean though, nice work so far

[CousinTone]

What was the result of water along the intake /head area, haven’t seen that reply, may have missed it. I’ve got 64, 292 with a new rock auto carb. I customized an old oil bath to house a paper filter from more modern snorkel. It is louder, like back in high school when we flipped the covers upside down and pissed off our parents from the increased noise.

Intake /vacuum leak is distinctively different from exhaust noise, I’d like to know the water test result. Also check thermostat housing, some have vacuum port. Look up the vacuum schematic and trace each line for connection and quality/crack(s). My 3¢.
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[Asshat]

Going to start it tomorrow (Saturday) and see what I can find. Will do some water spray and carb cleaner tests.
The connections to the vacuum tubing look pretty solid I really don’t think it’s leaking where a clamp is on the tubing. The PCV valve is a bit cocked, so I may pickup some more vacuum tubing and make that connection more secure.

And, the gasket at the base of the carb is secure and the carb mounting nuts are pretty tight.

[CousinTone]

Nice looking work!1

[Asshat]

Originally Posted by CousinTone

Nice looking work!1

Thank you!

[Steeveedee]

Where does the hose on the tee in the PCV hose go? I would only expect the PCV valve on that circuit.

[Asshat]

Originally Posted by Steeveedee

Where does the hose on the tee in the PCV hose go? I would only expect the PCV valve on that circuit.

To the distributor. I had the distributor plumbed to the port on the base of the carb, however, it did not provide any vacuum at idle.

[Asshat]

Here a video of it running, but not driving.

https://youtube.com/shorts/GdwXpFyJmJE

[jayoldschool]

Originally Posted by Asshat

To the distributor. I had the distributor plumbed to the port on the base of the carb, however, it did not provide any vacuum at idle.

That's definitely not correct.

[cwcarpenter98]

Might be me, but that sounds like normal carb noise. I've only had a stock 2 barrel and a Quadrajet though, so my experience is limited

[1966Step]

Here's a video link to my '63 292 w/1 barrel similar to yours. I just blew out my muffler a while back (long story) so I'm going to get that fixed this week but you can hear the carb pretty well for a comparison. I'm having issues also, but at least she's running.

https://youtu.be/tRspz7VyVAo

[Asshat]

Originally Posted by 1966Step

Here's a video link to my '63 292 w/1 barrel similar to yours. I just blew out my muffler a while back (long story) so I'm going to get that fixed this week but you can hear the carb pretty well for a comparison. I'm having issues also, but at least she's running.

https://youtu.be/tRspz7VyVAo

How do you have your vacuum advance plumbed? To the manifold or carb base?

[1966Step]

Carb base

[Asshat]

Originally Posted by 1966Step

Carb base

Can you do a close-up pic? Trying to see if your carb base is different than mine.

[1966Step]

Here ya go..

[Asshat]

Originally Posted by 1966Step

Here ya go..

Do you get vacuum at that port? Does it advance the timing when you put it to the distributor? Mine does not.

[1966Step]

Yes, I think that's standard.. From the 63 manual if it's any help

[Asshat]

Originally Posted by 1966Step

Yes, I think that's standard.. From the 63 manual if it's any help

So, maybe the smaller diameter throat cause a louder sound when opening the throttle?

[1966Step]

I think you need to send that plumbing back to the carb base as you shouldn't experience any vacuum at idle which you said was the case. Vacuum should come on as the throttle is opened. Others can correct me if I'm wrong here.

[Asshat]

Originally Posted by 1966Step

I think you need to send that plumbing back to the carb base as you shouldn't experience any vacuum at idle which you said was the case. Vacuum should come on as the throttle is opened. Others can correct me if I'm wrong here.

Ok. I can put it back.

[Steeveedee]

The vacuum signal to the distributor won't be as strong if it comes from the PCV circuit, because that's meant to flow, not hold vacuum. Does the base of your carburetor have a plug where the line goes in 1966Step's picture? His appears to have a plug where your ported spark connector is installed.

I suppose that it is possible that a smaller carburetor bore could make more noise, but I'm not sure.

OK, after looking back to post #29, I see that there is a brass plug in the manifold vacuum port on the throttle plate your carburetor. Looks to be 1/8" pipe. You can get a brass piece that has 1/8" male pipe on one end and a 3/16" barb on the other end, and run a hose to your distributor. As you can see, they've been run both ways. That potentially may not work, depending on the gasket between the float body and the throttle plate. You can check that by removing the plug and see if you get a vacuum leak. Whether you have manifold vacuum or not at idle is a "tastes great/less filling" kind of thing, and just like beer, some people can get pretty worked up over it.

You could also use a steel line like 1966Step has, if you want to bend one up. That would take a different adapter fitting, but those are common.

[Asshat]

Originally Posted by Steeveedee

The vacuum signal to the distributor won't be as strong if it comes from the PCV circuit, because that's meant to flow, not hold vacuum. Does the base of your carburetor have a plug where the line goes in 1966Step's picture? His appears to have a plug where your ported spark connector is installed.

I suppose that it is possible that a smaller carburetor bore could make more noise, but I'm not sure.

OK, after looking back to post #29, I see that there is a brass plug in the manifold vacuum port on the throttle plate your carburetor. Looks to be 1/8" pipe. You can get a brass piece that has 1/8" male pipe on one end and a 3/16" barb on the other end, and run a hose to your distributor. As you can see, they've been run both ways. That potentially may not work, depending on the gasket between the float body and the throttle plate. You can check that by removing the plug and see if you get a vacuum leak. Whether you have manifold vacuum or not at idle is a "tastes great/less filling" kind of thing, and just like beer, some people can get pretty worked up over it.

You could also use a steel line like 1966Step has, if you want to bend one up. That would take a different adapter fitting, but those are common.

I did have that plumbed to the distributor a while back. I changed it because someone on here told me it was ok to run manifold vacuum to the distributor.
That was quite a while ago; I’ll change it back tomorrow and see how it runs.

[jayoldschool]

Also, I recall you saying you are using a paper filter. In the stock air cleaner, or an open element chrome one?