first mod completed

[texasboy21]

Exactly. Unless it can be proven to be a benefit, they really do nothing. Be it catch oil vapors or straighten out the ions in your fuel molecules.

Keep in mind, valves need to be lubricated, and depending on how the new DI/PI engines use their injection, may not put enough fuel on the valve to lubricate it properly.

It is proven, they 100% catch oil vapors. You can argue until youre blue in the face about whether or not they are "necessary", but they are proven to do what they do. Whether your car needs one is up for debate.

Same idea as forced induction setups - they do exactly what they are intended, designed, and marketed to do, which is add X power. Some people say the car should have come that way from Ford, some say its nice to have but not necessary, and others say its a complete waste because the car is fine as is.

Whether or not you and your car need one is up to you, but they do what they say they do and you can quantify it.

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[The_Phantom]

Keep in mind, valves need to be lubricated, and depending on how the new DI/PI engines use their injection, may not put enough fuel on the valve to lubricate it properly.

^+1million

Some lubrication is required to get to the valves. I personally believe that the engineers who worked years on this engine know more about it than companies wanting to sell a mod for some $$$$.

However, I would advise anyone who doesn't have a can and thinks they are unnecessary to N-E-V-E-R post on this forum that they feel that way. I can promise you, the butt hurt responses that will come will be innumerable should you choose to engage in that conversation. I'm risking being burned at the proverbial stake just to impart that much advice.

 

[Silver Bullitt]

They are standard equipment on some pretty high-end n/a exotics, so I'm guessing they aren't just there for show. If it weren't for the maintenance issue of emptying them regularly, I bet you'd find more of them as standard equipment on performance oriented vehicles.

 

[MyStang]

Its like vaping if you could put a filter on your lungs why wouldn't you.

 

[MyStang]

So giving some thought to this after 3,254 spirited daily driving miles, I would check the results of both ford performance catch cans.

Driver side catch can, no sign of oil vaper residue.

Passenger side catch can, approximately 41.5 ml = 1.40 oz

 

[Norm Peterson]

Keep in mind, valves need to be lubricated, and depending on how the new DI/PI engines use their injection, may not put enough fuel on the valve to lubricate it properly.

I think you need to find some evidence to support any thinking that significant valve/valve guide lubrication comes from the intake port and works its way upward. Keep in mind that in the days before EGR and even PCV systems, the only fluids intentionally passing through the intake tract were gasoline and atmospheric moisture content, neither of which are worth much as lubricants in high temperature environments.

If anything, gasoline makes a good enough solvent to remove any valve stem lube . . . after all, isn't that what we're counting on the PI part to do with even heavier deposit compounds because the DI part can't do that at all?.

Actually, the problem with GDI alone is that there isn't any solvent action happening downstream of where either EGR or PCV products are introduced, which tends to allow that stuff to collect on the back sides of the valves and perhaps elsewhere. Better lubrication via the intake ports isn't going to help that; it'd be far more likely to make matters worse. What we're all hoping for is that there's enough PI going on to keep the DI from creating its problems. Rumor has it that earlier DI/PI efforts weren't always successful (FRS/BRZ?).

Oil in sufficient mixture strength certainly will reduce the effective octane of whatever fuel is being used. I don't know what proportion that would need to be, but zero % sure sounds better than any nonzero %.


Norm

 

[Racerx009]

I use 2 breather instead of the oil catch can

 

[GT Pony]

I run a catch-can because it catches oil that would otherwise go into the intake manifold. If the catch-can was always dry, then I'd have a different viewpoint, but it's always catching some oil so it stays on.

 

[racrguy]

I think you need to find some evidence to support any thinking that significant valve/valve guide lubrication comes from the intake port and works its way upward. Keep in mind that in the days before EGR and even PCV systems, the only fluids intentionally passing through the intake tract were gasoline and atmospheric moisture content, neither of which are worth much as lubricants in high temperature environments.

If anything, gasoline makes a good enough solvent to remove any valve stem lube . . . after all, isn't that what we're counting on the PI part to do with even heavier deposit compounds because the DI part can't do that at all?.

Actually, the problem with GDI alone is that there isn't any solvent action happening downstream of where either EGR or PCV products are introduced, which tends to allow that stuff to collect on the back sides of the valves and perhaps elsewhere. Better lubrication via the intake ports isn't going to help that; it'd be far more likely to make matters worse. What we're all hoping for is that there's enough PI going on to keep the DI from creating its problems. Rumor has it that earlier DI/PI efforts weren't always successful (FRS/BRZ?).

Oil in sufficient mixture strength certainly will reduce the effective octane of whatever fuel is being used. I don't know what proportion that would need to be, but zero % sure sounds better than any nonzero %.


Norm

My evidence is purely anecdotal, and is based on my experience with alcohol sprint car engines going all the way back to the 90's. There is a marked difference between the wear on a valve that has not had top end lube mixed with the fuel, and those that have. Given the timeframe those engines last, not running top end lube doesn't have serious detrimental effects, but if a street car exhibited the same wear it would become a serious issue. Given that most valve guides are brass, you don't need a lot of lubricity to keep wear down.

 

[1 old racer]

anymore updates on how much oil is being collected in the driver side catch can

 

[Rock&Roll]

Nice. Santa is delivering me a JLT Catch Can. I wasn't gonna install one but what the heck. I don't see the point but I like to tinker with my toy's in the garage. I figure I'm gonna sell this car before it has $100k miles on it and I just won't care what the intake looks like at that point but Daddy needed a present to open in front of the kids so ....

 

[Bluemustang]

There is a theory out there that oil vapor will cut down your octane.

I subscribe to this theory. When I removed my intake manifold after 45k miles, I saw oil gunk in the cylinders. @BmacIL who helped me said he had a catch can very early on and his didn't have any of the buildup when he swapped his intake. And he has more miles on his car than I do.

My understanding is that is normal for the engine and won't cause any "problems" until you have a lot of mileage on it. But anyway - anecdotal evidence, but after seeing the buildup for myself it's convinced me to get a catch can. If I use E85 I won't have a problem with octane but I'd rather not have to rely on that.

 

[Zelek]

Driver side is pointless unless you're boosted. You might have a little in the driver side if you constantly are at high RPM and track regularly, but doubtful. Passenger side is where you'll see the collection.

 

[BmacIL]

I subscribe to this theory. When I removed my intake manifold after 45k miles, I saw oil gunk in the cylinders. @BmacIL who helped me said he had a catch can very early on and his didn't have any of the buildup when he swapped his intake. And he has more miles on his car than I do.

My understanding is that is normal for the engine and won't cause any "problems" until you have a lot of mileage on it. But anyway - anecdotal evidence, but after seeing the buildup for myself it's convinced me to get a catch can. If I use E85 I won't have a problem with octane but I'd rather not have to rely on that.

And I drive my car harder (In addition to 67k miles, a good amount of track/HPDE work)

 

[Ebm]

And I drive my car harder (In addition to 67k miles, a good amount of track/HPDE work)

A crucial factor here is where you get your gasoline from. Top Tier gas like Shell and Costco will keep your engine cleaner. I'd love to see someone Borescope a 5.0 using a catch can vs a car without one. Then a separate test with a 5.0 using mom and pop gasoline vs a 5.0 using just Shell gas. Carbon deposits shouldn't be much of an issue compared to a DI only car.

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