If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS - Page 2
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2008-2013 Cadillac CTS General Discussion Discussion, If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS in Cadillac CTS Second Generation Forum - 2008-2013; Going back to the original theme: 'look at this'; well, if you didn't have a catch can, and depending on ...
  1. #16
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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    Going back to the original theme: 'look at this'; well, if you didn't have a catch can, and depending on your driving cycle (short trips, long trips), 99 plus percent of that fluid caught (plus or minus) would harmlessly be burnt (through combustion) through the PCV system. It doesn't stay in your oil crankcase contaminating your oil, and yes some of that oil (vapor) might aggregate to the intake valves (and that's where the "bone of contention" lies, whether in your determination you think you need a catch can or not (I'm in the camp of not).
    99flhr likes this.

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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    Direct fuel injection defined.

    Direct fuel injection is a fuel-delivery technology that allows gasoline engines to burn fuel more efficiently, resulting in more power, cleaner emissions, and increased fuel economy.

    How direct fuel injection works.

    Gasoline engines work by sucking a mixture of gasoline and air into a cylinder, compressing it with a piston, and igniting it with a spark; the resulting explosion drives the piston downwards, producing power. Traditional (indirect) fuel injection systems pre-mix the gasoline and air in a chamber just outside the cylinder called the intake manifold. In a direct-injection system, the air and gasoline are not pre-mixed; air comes in via the intake manifold, while the gasoline is injected directly into the cylinder.
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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    I don't have a dog in this fight. I am just a little anal about my toys and have been doing all my major/minor repairs since 1976.

    Without top tier fuels and their cleaning agents bathing the intake valve stems, DI engines are going to build up carbon on them. If the intake valves were open at all while the injectors were pressurized, the fuel would be shooting up into the intake plenum as the path of least resistance.

    The biggest concern with direct-injection technology is with carbon buildup. In a direct injection engine, oil droplets tend to get ‘baked’ on the valve. Carbon buildup can create a lot of headaches in the long-term, with build-up being bad enough to make extra noise during operation and damage the engine. At the very least it can reduce fuel mileage, and affect performance.

    This issue can affect other components in your car’s engine, like turbochargers or catalytic converters. Some automakers have filtering systems in place to catch droplets and debris.
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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    I think the point is, there hasn't been an over whelming number of reports by forum members, citing the need for valve jobs. If it was epidemic I'm sure we would have seen a ton of posts about it.

  5. #20
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    There are many mentions of carbon removal, and this is why. Just getting it out there to you all after some real world experience.
    Mark

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    calif phil is offline Cadillac Owners Fanatic
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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    I like your Vette's and your Harley Roadster. My '73 is also orange.
    xCCTer likes this.

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    Cougar281 is offline Cadillac Owners Fanatic
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    Re: If you have a DI engine and don't think you need a Catch Can - LOOK AT THIS

    Quote Originally Posted by hauler View Post
    I will guess that the Catch22 (pun intended) is that it will void the drivetrain warranty.
    I would assume that would depend on your dealer and service writers. I spoke to mine and they didn't see that as a problem at all. The service writer I deal with is a nice guy and knows a lot about these engines and understands how the valves get coked with oil. Once the weather warms up, I'll be getting and installing a can and cleaning the top of the engine.

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