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Thread: Brian Crower 7M cams and ignition timing issue

  1. #11
    Grumpy Old Man
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    Default Re: Brian Crower 7M cams and ignition timing issue

    I'm in Melbourne

  2. #12
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Quote Originally Posted by amichie
    Yes it was moved by the moderator and yes it is a GE (non turbo)

    Here is an update.

    I filed out the slot a little and now I have enough static advance for general driving.

    Idle is crap and it regularly stalls. I might have to tweak the cam timing a little as there must be too much overlap for steady idle.

    I'm guessing that advancing the exhaust cam slightly might be the way to go since that will improve both the static ignition advance and reduce the overlap slightly.

    Having fun anyway.
    I take it you have adj. cam gears? Do you have any type of AFR adjustment? Just curious if you can get it running well enought without some sort of piggyback(i.e. Apexi, etc.) When I installed my cams it was with other mods, bored, stroked, etc., and I had to install a Apexi II to get it to run decient. It would run OK, just wouldn't run GOOD. I also had problems with idle.

    I still don't understand why the thread was moved from Gen Diss., to GTE when you have a GE? Are you going GE-T.

    Also thanks for the lesson IJ.

  3. #13
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Quote Originally Posted by AJ'S 88NA
    I take it you have adj. cam gears? Do you have any type of AFR adjustment? Just curious if you can get it running well enought without some sort of piggyback(i.e. Apexi, etc.) When I installed my cams it was with other mods, bored, stroked, etc., and I had to install a Apexi II to get it to run decient. It would run OK, just wouldn't run GOOD. I also had problems with idle.

    I still don't understand why the thread was moved from Gen Diss., to GTE when you have a GE? Are you going GE-T.

    Also thanks for the lesson IJ.

    I don't know why it was moved by the moderator and I have no plans to go turbo. The moderator did send me a very polite PM saying it was being moved and I'm not that fussed about it.

    Oh and I have only one 5 bolt adjustable cam gear and one factory vernier gear. I think I will try reduced overlap with my 5 bolt gear on the intake cam and if that improves idle then I will remove the exhaust cam gear and advance it by 6 crank degrees.

  4. #14
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    Default Re: Brian Crower 7M cams and ignition timing issue

    AJ: Very welcome I learned all about it when I made my own billet cam for my old 3.4L Toyota V8 way back when

    No idea why Duane moved it but it's back where it's meant to be now

  5. #15
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Quote Originally Posted by IJ.
    AJ: Very welcome I learned all about it when I made my own billet cam for my old 3.4L Toyota V8 way back when

    No idea why Duane moved it but it's back where it's meant to be now
    Is there anything you haven't made? Except "baby buggy rubber bumpers"

    Amichie: Interested to see if you can get it to run well enough without fuel control and just timing. Please keep us posted.

  6. #16
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    Default Re: Brian Crower 7M cams and ignition timing issue

    AJ: Been doing this a very long time and in the old days we made just about everything as there was very little "aftermarket" available

  7. #17
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Quote Originally Posted by AJ'S 88NA
    Is there anything you haven't made? Except "baby buggy rubber bumpers"

    Amichie: Interested to see if you can get it to run well enough without fuel control and just timing. Please keep us posted.

    It seems to me that degreeing of the cams is required.

    The fact that the ignition timing was retarded so much and that the idle is so bad suggests to me that there is a lot of static retard on the exhaust cam.

    I assumed the dowel pin holes would be set up so that if you use the middle pin hole on both the cam and the wheel then the timing wold start off in a neutral position. I will try and do some kind of check on valve opening and closing angles to try and figure out if the cams are biased one way or the other.

  8. #18
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Degree them per the timing tag so you have a baseline 0 point then go from there (sorry didn't realise you hadn't degreed yet)

  9. #19
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    Default Re: Brian Crower 7M cams and ignition timing issue

    Quote Originally Posted by IJ.
    Degree them per the timing tag so you have a baseline 0 point then go from there (sorry didn't realise you hadn't degreed yet)

    Why the XXXX wouldn't they do it from the factory. If toyota can do it then Brian Crower should be able to.

    They did supply a little timing card. A few pics below






  10. #20
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    Default Re: Brian Crower 7M cams and ignition timing issue

    There are a bunch of variables that will affect the Cam's true 0 point such as ANY machine work done on the block or head, Belt stretch, Pully wear, Head Gasket thickness and so on.

    This is why they give you the "220@50 thou" Spec so you can degree them in and when your degree wheel says 220@50 thou you look at the Cam pully and this will be YOUR motor's true 0.

    From memory 1mm difference is around 2>3 degrees.

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