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Thread: MultiAir and Throttle Plate

  1. #11
    Amministratore Fiat500USA's Avatar
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    I wouldn't be surprised if maybe 80% of folks having oil problems is due to people not checking their oil during break-in, damaging the engines, which leads to more consumption.

    We've bought 3 Fiats and one Alfa within 8 years and all these cars barely used oil. My Abarth has 60K on it now and I don't think I've added a total of 2 quarts in all those miles. Our 2.4 in the 500X we had I think it was 1/2 a quart in 30K. We have 20K on the Alfa and have added less than 1/2 a quart using 9K oil changes.
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  2. #12
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    Quote Originally Posted by Fiat500USA View Post
    I wouldn't be surprised if maybe 80% of folks having oil problems is due to people not checking their oil during break-in, damaging the engines, which leads to more consumption.

    We've bought 3 Fiats and one Alfa within 8 years and all these cars barely used oil. My Abarth has 60K on it now and I don't think I've added a total of 2 quarts in all those miles. Our 2.4 in the 500X we had I think it was 1/2 a quart in 30K. We have 20K on the Alfa and have added less than 1/2 a quart using 9K oil changes.
    My 10 year old 500 has never used oil. Same with the 500L we owned. It was hard on transmission. 90% people who drive any brand car. Very seldom check their oil level, between oil changes. I’ve always been conscious in doing so. Every fill up. After working several car dealerships over the years.

    Our turbo Accord touring, the Soul ,and Fit never seem to use oil either. My daughters Jeep renegade does use oil. Not in excess.
    Last edited by smark; 01-17-2021 at 02:51 PM.

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  4. #13
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    Quote Originally Posted by HalfPint View Post
    All the intake vacuum in every engine comes from the pumping of the cylinder, that is the source. With the throttle plate closed upstream of the intake valves, a low pressure is created in the intake manifold, everywhere downstream of the throttle plate.

    So thinking about it further, they must close the throttle plate on overrun or there would be no compression braking, just like on a diesel which has no throttle.

    Taking that further, if you were to try to reduce oil consumption with a firmware change as they have done, the only strategy would be to change the cam timing to reduce pumping efficiency on overrun, thus reducing the intake vacuum in general. Since they only have control over the intake valves, you'd just try to keep the intake valve open longer, along with the throttle plate, while having the fuel shut off. That way there would be no vacuum in the intake, and little in the cylinder. There would also be little compression braking, but drivers with automatics are used to that.

    It still doesn't tell if the oil is coming past the rings or valve guides.
    If the intake valve is left closed during deceleration (as the vids imply) then TB position isn't important. Part of the reason for the design is to maintain pressure in the intake manifold. (Have to hook up a meter to check the ECM, realizing the TB would lag a bit.) If they actually shut down the FI and intake valves, I'm wondering why the mod'd Abarths would crackle on deceleration. There should be very little fuel/air in the exhaust?

    As for engine braking with most engines, the engine is basically turned into an air compressor, some is due to pulling air thru a "plugged" manifold, some is compressing that air. I don't know what steps Fiat took, if any, to reduce oil consumption... but simply opening the intake valves briefly during deceleration should help. Introducing a bit of air should minimize negative air pressure at the bottom of the stroke?

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