What is that all about? How do you clean an intake manifold, doesn't gas flow thru it all day long?
when taking my Jeep into the dealer for the air bag recall they wanted to clean the intake manifold or suggested that the intake be cleaned along with other items.
Your PVC systems dumps all the waste gases in to the intake. It looks like oil but it is actually combustion byproducts. These are actually acids that won't hurt the plastic parts they do tend to pile up over time. One of the reason people use oil catch cans is to eliminate this.
I would not spend money doing these though unless you where also having spark plugs changed. I do all the work myself so it cost nothing but time.
The only thing going thru the intake is air and oil vapors. The oil vapors get burned off through the combustion chamber. This is a feature on all engines.
Fuel is injected by the injectors. Years ago, The injection was at the bottom/ end of the intake. Now a days, the injectors are mounted in the heads.
So the old intake cleaning is not really needed any more. But some still try there best to sell it.
Have you had your intake off? You can pour crap out of it with as little as 50K miles, I did. While the theory is sound that application is fubar'd. There a 2 breather ports, one pre throttle body and one post. When these gases hit the cooler intake stream they condense to a solid state and leave a block oily like substance behind.
Also none of these engines are DI, they are port injected. At least with port injection the intake valve stay clean where as DI the intake valves get coated with this crap and then it gets baked on.
use top tier gas and you will be fine. Intake cleaning is a pure profit service item. Think about it they don't have to do anything and no-one will ever know. If you are worried run a bottle of Techron thru once and while.
I am not going to worry about this then, but next summer I will look at this while I am changing out my spark plugs when the intake needs to come off anyways.
Yes, there will be oil residue from the PCV system in the intake manifold, but generally it's not a big issue on port injected engines like the pentastar, as the fuel injectors will keep the intake valves clean enough. If this were a Direct Injection engine, it would be a totally different story.
Also, there are some intake manifold designs that have pockets which absolutely do pool up oil, but not all of them do. I don't recall if the intake manifold design of the pentastar is prone to this or not.
the pentastar uses differently designed intakes for different platform applications
in the wrangler, its the oddball design with the TB in the front
most platforms have a TB position that sits toward the rear of the block.
from a simple eye test ,it would look like the jeep intake layout would flow better.
being it has a shorter airbox run and a straighter shot into the plenum.
tho there are no statistical numbers to back that up, as performance is the same across different platforms.
now along the same lines oil catch cans are widely used on many non jeep pentastar applications .almost mandatory in some circles.
while some people in the jeep circle do use catch cans , excess oil doesn't seem to be as noticeable a problem.
that would be a possible result of a better flowing intake
Performance (HP) is not the same across the platform. FCA engineers have confirmed that the HP gains in the Charger, Challenger, etc., are strictly due to increased airflow due to the different intake designs.
Despite the four variants of the 3.6 already being sold — rear drive (290 hp), AWD (292 hp), FWD (283 hp), and Challenger (305 hp), there are just two head designs, two intake manifolds, and one set of internal components, including cam and pistons (this probably changed when they added the Ram setup, 305 hp, though the rep said the main advantage in the Ram was the space available for the exhaust), according to an SAE article by Paul Weissler. The Challenger's 13 horsepower increase is due to "a more aggressively designed intake air system" which increased airflow from 214 to 220 g/s.
At 50k I ran a can of Mopar Combustion Chamber Cleaner through it, pulled off my throttle body, cleaned it all up and also removed the intake manifold and cleaned it all out.
This was completely unnecessary overly maintaining the Jeep. I just enjoy that kind of thing. Ill do it again at 100k
I've been running K&N filters across many different vehicles for 20+ years. Forced induction and naturally aspirated, turbo'd and supercharged. Open cone types, drop-in replacements in stock airboxes, etc. I would estimate close to 500,000 miles in total, without ever having an issue with dirty throttle bodies, issues with O2 sensors, MAF sensors, etc. If you know how to properly clean and dry them, and properly oil them, and let them dry before re-installing, you won't have any issues. I would assume that anyone who has ever had any type of issue related to them, has a hard time figuring out how to put gas in their vehicle, and has no clue of the proper way to maintain a K&N filter. :mooning:
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