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Thread: what does "twinport" mean?

  
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    JazSXI's Avatar
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    what does "twinport" mean?

    im about to buy an mk5 astra 1.6 twinport, but i dont know what "twinport" actually means?

    jaz

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    Windrew's Avatar
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    Each of the two inlet valves per cylinder has their own port (hence "twinport"). Under light/medium throttle and low/moderate engine speeds, one of the ports for each cylinder is closed off by flaps which increases the gasflow in the other ports, which is good for economy, emissions and torque.

    At full throttle all ports are open ensuring no loss of output.

    take a look here

    http://www.theautochannel.com/news/2...16/038851.html
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    Twinport is a variation on the old TwinRAM system as developed for the V6 engines. Basically, it's a variable length intake tract, which allows for high torque all through the rev range.
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    i am right in thinking the car will achieve a higher mpg without any loss in performance?

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    Quote Originally Posted by JazSXI View Post
    i am right in thinking the car will achieve a higher mpg without any loss in performance?
    yes it is possable, the engine is made this way mainly to reduce emmisions
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    ok thanks for the help. i think i understand it a bit better now
    cheers

    jaz

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    I have a 1.6 twinport but technically it's broken. I have the code "1113" which basically means either the flaps are suck open or the sensor on the inlet manifold is goosed. Vauxhall decided it would be a great Idea to have this sensor non-removable from the manifold hens to fix the problem I now need to buy a whole new manifold......Great!
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    Quote Originally Posted by S-T-F-U View Post
    I have a 1.6 twinport but technically it's broken. I have the code "1113" which basically means either the flaps are suck open or the sensor on the inlet manifold is goosed. Vauxhall decided it would be a great Idea to have this sensor non-removable from the manifold hens to fix the problem I now need to buy a whole new manifold......Great!
    Keep an eye on ebay! I got a second hand manifold for £90 inc lower half of the manifold and injectors, loom and sensors! Vauxhall price i was quoted was £481 + vat!

    However, 1 thing i will say is there have been revisions of the manifold and throttle body from the early to the later ones!

    The later throttle bodies have an oil breather outlet on the back, early ones dont! The early ones have the breather entering the lower part of the manifold at the side via a small plastic plate, the later have this blanked off! Though you can mix and match parts to make it fit like i have!
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