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Thread: Custom Engine Swap

  1. #11
    So wow, it's been a while. I'm a slow worker / not a lot of spare time to work on things in general. It took absolute ages to get my custom cam wheel sensor made. The first one took the better part of a month to get to me due to a manufacturing error, then when I received it I realized it was too thick to work. I thought I could get away with it but no dice. Had a second one made which while was thin enough to fit inside the Aerio cam position sensor housing didn't exactly inspire confidence in its quality, didn't exactly match my design. Thats what I get for going with the cheapest vendors. The first wheel was made using laser cutting and the second was water jet cut. Neither one is anything to write home about.

    So after putzing around we finally got the engine fully assembled and installed in the car. Only to realize that we forgot to install the rear main seal. Damn. Had to take the transmission out to put that guy back in (or in the first time as it were).

    Once everything was finally sorted we went to turn the key and... nothing. Lots of trouble shooting and we forgot the ground that is behind the alternator. That and a new battery had it turning over but not starting. Liberal application of starting fluid had it run, but only while spraying. Scratching our heads we figure there are only two things different physically about the engine: the cam position sensor and the crankshaft. We were confident we had spark since the engine ran under starting fluid. But, since the cam wheel was custom and not exactly confidence inspiring we decided to try and start it with the cam position sensor unplugged. This time it wouldn't run under starting fluid. So plugged back in the cam sensor and disconnected the crank position sensor and started right up! Sounded like death but after breaking it in and verifying the timing using a strobe and the timing gauge in the bellhousing it seems to be OK.

    We are going to double check the valve lash. I bought a rebuilt head and like a fool didn't really check it over.

    In any event. She runs! https://youtu.be/G60h-8lTcWE

    Need to do something about that intake... Also I'm not sure what the oem ECU is doing with the crank position sensor unplugged and not entirely sure what to do about it. There must be something different either about the pattern of teeth on the J18 crankshaft and the one on the J20A crank. Either that or the diameter is smaller and the sensor just isn't picking them up. Not sure. I think my plan is to get another (oi!) wheel cut for the crank pulley and just do an external crank position sensor.

  2. #12
    Join Date
    Nov 2010
    Location
    North of Montréal, Canada
    Posts
    655
    I think you're right about the crank pattern. I did all that research you did for your motor build, but like 10 years ago lol. I know for a fact the J20 (aluminum girdle, Aerio engine), J23 and J20A (both iron girdle) all have the 36-2-2-2 crank wheel (same pattern used in older swifts, and WRX to name a few). In fact, they are exactly the same dimensions. the J18 has shorter stroke (that you figured out already). But I remember there was something about the J18 that did not work. I think there is no missing teeth on the J18 wheel.

    I know it's too late for you now, but I would've kept the J20A crank only because it's forged. the other ones are cast. It's also compatible with any good aftermarket ECU. with this crank wheel you only need 1 tooth off the cam to get 100% sequential injection and ignition. That being said, just put an oscilloscope on it and you can figure out what pattern it has, and choose your aftermarket ECU accordingly
    former Suzuki Gold Master Tech

  3. #13
    I didn't hook up an oscilloscope but I did look at the J23 crank that isn't in the engine. It doesn't have missing teeth, assuming the J18 is the same. Would work then in an Aerio but doesn't in an SX4 using the oem ECU. Going to get a bracket made up to mount the crank sensor externally and pickup a 36-2-2-2 wheel from the crank pulley. That should solve my problems and I'll finally be good to go.

  4. #14
    Join Date
    Nov 2010
    Location
    North of Montréal, Canada
    Posts
    655
    IIRC the J18 is different from the rest.


    EDIT
    I can't find an example of scope trace for the J18, but I found it for the old J20 and it confirms the 36-2-2-2 in the aerio 2.0L engine. the 2.3 got 36 teeth none missing. I was certain it had 36-2-2-2. you are probably going the right way with the external 36-2-2-2. I'm not even sure the J18 could be modified to work, must have 36 teeth. It could very well have 6 teeth only. it's a pattern that was used in the past alongside the 36-2-2-2 (in the swift and sidekick G series)


    aeriostyle forum was a good place to look for J18/old J20 stuff, but their site seem to be down. they are on FB tho.
    Last edited by automat; October 12th, 2017 at 04:44 PM.
    former Suzuki Gold Master Tech

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