dusty run/air filter - JeepForum.com
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post #1 of 31 Old 09-18-2017, 03:34 PM Thread Starter
eddiefast
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dusty run/air filter

Did a dusty run yesterday. (Bee Cnyn-SoCal). Less power on hills coming home. 1st check was air filter. Aha! But am I going to need a new one every dust run? Better solutions sought. It was pure as snow 2 days ago.

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post #2 of 31 Old 09-18-2017, 03:47 PM
biffgnar
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That looks like more than just dust, but to your question depending on how bad the dust is filters can become high use items. I've been in desert races where we had to stop by the side of the course during the race to try to clean filters to keep our engine running and pit/chase guys having new ones to change if necessary is standard.
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post #3 of 31 Old 09-18-2017, 04:17 PM
Jerry Bransford
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It depends. My TJ is usually in dry dusty SOCAL conditions and my AC-Delco (or Purolator if I couldn't find an AC-Delco) air filter usually responds well to just being thoroughly blown out by the air nozzle on my shop compressor. It's a judgement call where I know if it needs replacing but couldn't describe exactly what my parameters are.

But as Biff noticed, your air filter looks like there's more than dust in it. Perhaps a bit of blowby from your combustion chambers?

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post #4 of 31 Old 09-18-2017, 05:09 PM Thread Starter
eddiefast
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Quote:
Originally Posted by Jerry Bransford View Post
It depends. My TJ is usually in dry dusty SOCAL conditions and my AC-Delco (or Purolator if I couldn't find an AC-Delco) air filter usually responds well to just being thoroughly blown out by the air nozzle on my shop compressor. It's a judgement call where I know if it needs replacing but couldn't describe exactly what my parameters are.

But as Biff noticed, your air filter looks like there's more than dust in it. Perhaps a bit of blowby from your combustion chambers?
Blowby? Perhaps from my bunnyhopping and endangering axles et al with purely beginner handling (not handling) serial bumps? Over-revving? Or am I misunderstanding blowby and how oil got there? Also thanks. Never thought about compressor for cleaning on trail/anytime. Big learning curve methink. Thanks to both you and Biff for responding
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post #5 of 31 Old 09-18-2017, 05:36 PM
Jerry Bransford
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Blowby is when a little oil is making it out of the engine into the air intake via the PCV (positive crankcase ventilation) port.

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post #6 of 31 Old 09-18-2017, 05:41 PM
biffgnar
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Been awhile since I ran stock air intake but if I recall correctly the intake horn is at one end of the box and the pipe to the throttle body is on the other end (I think I have an old box on the shelf I could go look at to confirm). Which end of the box was the dark part of the filter oriented to?
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post #7 of 31 Old 09-18-2017, 08:56 PM Thread Starter
eddiefast
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Quote:
Originally Posted by Jerry Bransford View Post
Blowby is when a little oil is making it out of the engine into the air intake via the PCV (positive crankcase ventilation) port.
Thanks and thank heaven for internet so I could find out what a PCV port is. Last car I actually worked on was a 1950 TD (MG) and not so long after 1950. Didn't have much more than a couple SU side drafts and a manual crank. Things have changed. I am just going to abide for the time being and keep watch. Maybe the filter was dirty all along and my peek at it may have been an inadequate inspection. Not to have you being my research source, what is the usual cause of the blowby? No problem if I have used up my welcome and you don't respond.
I am nonetheless appreciative that you and others are so willing to help and teach
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post #8 of 31 Old 09-18-2017, 09:25 PM
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I don't know how your airbox and PCV are arranged, but I've never had a rig that put the PCV outlet where you could get oil on the pleat side of the filter. Did you have the pleats toward the carb? Did the oil soak through from the flat side?

In any case, I believe the blowby referred to would be oil getting through the PCV valve and making it to your intake. It's a common issue, and one solution is to put an oil catch can in line between the PCV valve and the intake. I just did that on my hemi. The can was about $20 on amazon.


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post #9 of 31 Old 09-18-2017, 09:32 PM
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Doesn't the TJ have the CCV with a metered orifice (no valve)?...
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post #10 of 31 Old 09-18-2017, 09:51 PM
Jerry Bransford
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Edit: In the TJ's case CCV = Closed Crankcase Ventilation. Not valve.

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post #11 of 31 Old 09-18-2017, 11:10 PM
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I found this in the 2000 TJ FSM when I stumbled on it years ago:


CRANKCASE VENTILATION SYSTEM




DESCRIPTION




All 2.5L 4–cylinder and 4.0L 6–cylinder engines


are equipped with a Closed Crankcase Ventilation


(CCV) system (Fig. 4) or (Fig. 5).




OPERATION




The Closed Crankcase Ventilation (CCV) system


performs the same function as a conventional PCV


system, but does not use a vacuum controlled valve.


On 4.0L 6–cylinder engines, a molded vacuum tube


connects manifold vacuum to top of cylinder head


(valve) cover at dash panel end. The vacuum fitting


contains a fixed orifice of a calibrated size. It meters


the amount of crankcase vapors drawn out of the


engine.


On 2.5L 4–cylinder engines, a fitting on drivers


side of cylinder head (valve) cover contains the


metered orifice. It is connected to manifold vacuum.


A fresh air supply CCV tube (hose) from the air


cleaner is connected to front of cylinder head cover


on 4.0L engines. It is connected to rear of cover on


2.5L engines


...
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post #12 of 31 Old 09-19-2017, 03:58 AM
Joe_Fordyce
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I took the hose off that runs between the valve cover and the intake and stuck a filter on the stub sticking out of the valve cover. No more oily mist getting into the intake tube.
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post #13 of 31 Old 09-19-2017, 09:46 AM
toximus
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At least the late years have a CCV (not a PCV).

OP - If dust continues to be an issue, a snorkel with a prefilter may be worth looking into.


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post #14 of 31 Old 09-19-2017, 09:56 AM
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Quote:
Originally Posted by Joe_Fordyce View Post
I took the hose off that runs between the valve cover and the intake and stuck a filter on the stub sticking out of the valve cover. No more oily mist getting into the intake tube.
I have just started to smell a bit of oil going up hills towing. I suspect , based on looking at my filter, the same thing is happening, blow-by.

By eliminating that tube between the Intake and VC , did you notice any performance difference?

Thanks in advance.

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post #15 of 31 Old 09-19-2017, 10:00 AM
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It won't effect your performance.
But, if you have blow-by, an open filter in the end of your CCV hose is going to dribble oil.
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