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Thread: Tech Tech Tech, or...So you want to build a trike?

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  1. #101
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  2. #102
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    Ok.

    So what topic do you need tech info on?

    What to take on next?

  4. #104
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    Here is one that gets asked a lot.

    Wiring for an alternator upgrade.

    Yes that idiot light is critical.

    2869791664_1cae444fa2_o_zpswyfnocro.jpg

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    Here is a diagram showing what "full flowing" a vw means.

    As you can see all of the flow from pump goes to the filter and/or cooler. All the flow all the time, hence the name full flow.

    389779.gif

  6. #106
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    Some visual help to identify an engine.

    787215_zpszoncofun.jpg

  7. #107
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    Ok so now you are ready to build a vw engine for your scooter.

    How far do you go with modifications?

    Depends on a lot of things....

    Money being a big one.

    Skill with engine mods.

    What you want it to do.

    What you need it to do.

    The very first thing to do is to upgrade to a later 1600 dual port engine.

    Most all the aftermarket parts are based on modifying this engine.

    Any of the other vw engines are very limited on how much you can do, but are a fine stock engine.

    Just the upgrade to the late 1600 may be plenty for your needs.

  8. #108
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    Some terminology.....

    When asked most people will say

    "I want it to go faster

    Faster is more mph.

    Quicker is acceleration.

    Faster is a function of gearing or increasing maximum rpm put into the trans.

    So a stock (in good order) late 1600 will pull red line in high gear with a light trike. A very worn down engine has a hard time pulling high gear at all.

    Putting a big bore kit on a stock crank (like a 1915cc 69 stock crank and 94 bore) will do nothing to increase your red line. Your top speed will be the same. You will get to speed a heck of a lot quicker and have a big smile on your face. But is not faster it is quicker.

  9. #109
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    So a lot of the big modifications on the engine is to increase the maximum rpm of the engine.

    The stock vw crank is limited to under 5500 rpm maximum. Not because it is a bad unit at all. The metallurgy of the german metal is excellent. But it is in the balance of the spinning mass.

    This is where the hot rod counter weighted cranks come in. A better spinning balance and the rpm can go up higher without whipping itself apart.

  10. #110
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    So where did we stop at?

    What y'all wanna talk about now?

    Modified engine parts?

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