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Thread: VW Mid Engine Trike

  1. #1
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    Default VW Mid Engine Trike

    This is a VW Trike a friend bought for $500. It wasn't running and NOTHING worked. I tore it down and once I go through and rebuild the engine and transaxle will start rebuilding it. The picture shows the body flipped around as I want to convert it to a mid engine. (The red rag in the bag sits on top of the neck which will be removed.) Now for my first question, has anyone made an extension or spacer between the front of the transaxle and rear of the engine? I need to move the engine forward 15" for my idea. Fabricating a spacer from many pieces of tubing isn't a problem, but the "driveshaft" is.

    Anyone done or know how this is accomplished? Swiss mid engine trikes appear to use a second transaxle case for the spacer, but no details on extending the tranny shaft to the flywheel. I plan to hit the local machine shops about turning one with external and internal splines.

    And to those that say I'll end up with one forward and four revers gears, it has the transaxle with plates on both sides so I can flip the pinion gear over. Not sure why the image rotated 90*...

    20171217_123556.jpg

  2. #2
    300+ Posts LarryA's Avatar
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    Rickus Dickus Welcome to trike talk.....look for the threads by "death by snu snu" right here on this vw forum, I believe he used the double case mid engine design. check out his build! Larry

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    welcome aboard Hugh. we have a small group of very knowledgeable VW trikers. I hope they can jump in here and get you going.
    Stallion #406 // 2013 Tri-Glide

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    Pm me or hit me up on Facebook.

    I can hook you up with the info.

    Also go though my Anyone Else thread to see one built.

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    Default Thank You

    Quote Originally Posted by DeathBySnuSnu View Post
    Pm me or hit me up on Facebook.

    I can hook you up with the info.

    Also go though my Anyone Else thread to see one built.
    Reading the thread......

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    Default Engine Tear Down

    Tore into the engine today. Bringing the block to a machinist late next week since that dang flywheel nut kicked my butt up one side and down the other. With luck they will have a BFIW ( Big Frigging Impact Wrench) and spin it off for me. Did measure the bore and stroke coming up with 1597cc. I do like the heads comming with their build in carrying handles too!

    When I open the transaxle to flip the pinion gear to the other side, is there anything I should check/inspect?

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    Set the backlash and I would check the swipe pattern.

    You have an irs or a swing?

    If it's irs change the stub axle seal.

    If swing change the axle end seals.

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    Default Transaxle

    It's a swing arm for now. The swipe pattern is making sure the contact area on the pinion gear is centered, right?

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    A swing is easier to make the rear suspension for.

    If you are keeping the stock side plates it will not be so hard to do.

    Set the backlash first. Move shims from one side to the other as needed. Checking the swipe will just insure a good contact. Most likely it will be ok unless the gears are worn. A little loose on the backlash is where they usually land to get the swipe centered on used gears.

    The main thing is not to tight and not terribly loose and the swipe to NOT be only on the tip edges of the gears.

    The gears are helical not hypoid. Easy.

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    Default Ideas in the Old Brain Cell

    Now that is looks I have the flu, I get to sit and do NOTHING! Been thinking about the VW Trike and have a few questions:

    1) To Death by SnuSnu. Would grooving the main and connecting rod bearings provide any benefit in a stock engine?

    2) To anyone. Any issues with using the original dual port intake manifolds with dual Mikuni carbs?

    3) To anyone. I am changing the points out for an electronic distributor. Would adding vacuum advance help with reliability even though the existing distributor doesn't have one?

    4) To anyone. Is there a "kit" available with J-tubes and other pre-bent tubing which allows you to run an exhaust yourself?

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