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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 10-30-2012, 10:06 PM
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Default Why a catch can?

Im new to he new rams....

Soooooo, can any one tell me the full deal as to why lots of people are doing the catch can mod?
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Old 10-30-2012, 10:30 PM
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Because it is cheap insurance by keeping your top end nice and clean. Just check out this thread, it has all been explained in there. http://www.ramforumz.com/showthread....ighlight=catch
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Old 10-30-2012, 10:55 PM
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heres a good one too. after the first few posts


http://www.ramforumz.com/showthread....ighlight=catch
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Old 10-30-2012, 11:59 PM
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it keeps oil out of your air filter housing and looks awsome
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Old 10-31-2012, 12:05 AM
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Quote:
Originally Posted by jhinkle1989 View Post
it keeps oil out of your air filter housing and looks awsome
^^^ Close but not quite the air filter housing, actually it's the hose that goes just under the throttle body that comes from the PCV valve.
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Old 10-31-2012, 08:58 AM
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Quote:
Originally Posted by jhinkle1989 View Post
it keeps oil out of your air filter housing and looks awsome
Your second reason is why eight out of ten people have them.....

Kudos for being honest.
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Old 11-01-2012, 06:17 PM
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You will see why everyone is Doing it once you experience how much oil you get in the catch can. I put 1000kms on since I put y catch can on and it is half full... That is a lot of oil to be putting on your top end
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Old 11-03-2012, 06:55 AM
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So once its full you just pour it out?

Im a little worried now that i just bought a $60,000 truck that loses oil?!
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Old 11-03-2012, 04:23 PM
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im new to this catch can thing. can they be put on the 4.7?
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Old 11-03-2012, 05:13 PM
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Default

every engine needs to breathe,
both down in the crank case & up in the combustion chamber

the combustion chamber is basically above the pistons, where your spark plugs, valves, intake & exhaust manifolds are
Fuel & air goes into the intake manifold, then to the top of the pistons, the spark plug fires, the exhaust manifold takes away the unused pressure

below the pistons, there is the crank case
there is nothing there but a load of parts moving around in oil ( there is no gas or air in the crank case ), it is suppose to be a separate sealed off area from the combustion chamber, but it is only separated completely by pistons, piston rings, hydraulic lifters, & seals on the valves. So with all these parts moving, there is some PRESSURE in the crankcase, because of blow by.
That pressure builds up & it has no where to go
old engines crankcases had a ROAD DRAFT TUBE that allowed the crankcase to release that pressure build up, the excess pressure went down a tube & dumped just in back of the engine on to the road.
Along came the SMOG people, they said that we could no longer dump these oil fumes onto the road, so PVC smog laws were made.
They said that we had to reuse these oil fumes, basically recycle them through the engine again
So now we are putting oil fumes into the combustion chamber, where oil is not suppose to be,
so someone invented a catch can, it allows the dirty air to pass through the filter in the top of the catch can, but the oil in the fumes are trapped & drop into the bottom of the catch can.
all we have to do is dump the contents when we change our oil

look at this drawing, it shows how the road draft tube used to function
http://lh5.ggpht.com/_Ii1ukGkfijY/Sq..._image0023.jpg
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