Speaking of air cleaner ... is this the Lesser Spotted Really Tall One? (and why?)

[dremu]

Went 'round the PnP and pissed myself off, as usual, for not getting a cart for my toolbox, and for the lack of selection they have. Anyway, among the other stuff that came home was this...

Which has this humongous tall filter

(black on the bottom; the orange Fram on the top is the one I have in my other trucks.)

And inside is this metal pre- (post-?) filter thing

So, is this thing at all useful? Cool factor? Does it actually filter more or less or whatever, and what's with that inside thing? Seems to be well-attached, like it's not replaceable nor easily washable whilst on the truck.

-- A

 

[4X4HIGH]

This was just talked about on here today. That inside filter thingy is a spark arrestor of some sort. You can remove it and throw it away. The tall filter will obviously allow more air to enter than the shorter air filter assuming that the inlet snorkle is also larger.

 

[dyeager535]

That's that carbon filled piece we've been talking about. Heard it called both a flame arrester (according to some GM lit.) and I'm certain I've seen it called an emissions device. No idea why a flame arrester would need charcoal though.

It's glued to the air cleaner, rip it off.

 

[dremu]

This was just talked about on here today. That inside filter thingy is a spark arrestor of some sort. You can remove it and throw it away. The tall filter will obviously allow more air to enter than the shorter air filter assuming that the inlet snorkle is also larger.

That whole bloody filter-looking thing is the infamous spark arrestor??? Jeebus!

I'm thinking I'm gonna do the dual-snorkel thing a la HarryH3 in my other thread, so there should be enough airflow . Should prolly wait till that motor is in the truck though to figure out placement of the second snorkel. (Can you tell I'm impatient about my 454? )

'Fore that, though, I'm gonna put the new-style air tube onto my K5 ... it has a REALLY restricted snorkel nose on its cleaner now, and I s'pect the hot air isn't helping either

-- A

 

[dremu]

That's that carbon filled piece we've been talking about. Heard it called both a flame arrester (according to some GM lit.) and I'm certain I've seen it called an emissions device. No idea why a flame arrester would need charcoal though.

It's glued to the air cleaner, rip it off.

Wow. I'd never seen one of those; I thought y'all mighta been referring to the vacuum operated flippy thing inside. What is that, btw?

I know the one on the snorkel proper is to let some hot air in off the manifold when it's cold ... but this one?

-- A

 

[4X4HIGH]

The little green item you're speaking of is to allow vacuum to a ported vacuum switch but only after that switch has reached a certain temp at which time it opens and allows the vacuum to flow throw it.

 

[dremu]

The little green item you're speaking of is to allow vacuum to a ported vacuum switch but only after that switch has reached a certain temp at which time it opens and allows the vacuum to flow throw it.

So what's switched on the far side? Tranny? Both my '74's are pretty simple that way, not much in the way of smog or the like.

-- A

 

[dyeager535]

It's for the thermac valve...closes off the cold air induction and draws it from the manifold.

 

[dremu]

It's for the thermac valve...closes off the cold air induction and draws it from the manifold.

Oh, the flapper thing. I was gonna bypass that on the second snorkel ... or should I run the vacuum through a tee and flap both of them?

-- A

 

[dyeager535]

I did that on one of the ones I built. I know some have said that it does keep their carb from icing up, for warmup though, no idea how beneficial it *really* is.

If you don't plan on plumbing a heat riser on both sides, I'd not worry about running vacuum to both.

 

[dremu]

I did that on one of the ones I built. I know some have said that it does keep their carb from icing up, for warmup though, no idea how beneficial it *really* is.

If you don't plan on plumbing a heat riser on both sides, I'd not worry about running vacuum to both.

Well, I'd think that the air in the engine compartment (i.e. right under the flapper) isn't THAT much cooler than that on the manifold... like I'd hardly need the heat riser tubing.

However, that may just be due to the heat we're having this week; maybe I'd think differently in the winter

All good points; thanks!

-- A