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Thread: CrossFlow 1600 megasquirt

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    CrossFlow 1600 megasquirt

    Hey

    I've been building a X/F the past year or so. To start, these are the specs.

    Forged pistons (DP greece) 8.5/1 CR (going turbo in the near future)
    Steel rods (long rods 5.23" if I recall correctly)
    HD bearings
    ARP all over the place
    Big valve head from Burton (Stage 3, double springs, 41mm inlet, ...)
    Duplex timing chain (adjustable)
    MegaSquirt MS2
    home made SS exhaust 2.5" front to back (on stock manifold for now)

    Everything is running perfect at idle, cold start is also very good.
    Only thing I'm not familiar with is the ignition mapping.
    Idle is at 10° for now, read that XF is best at 14°...
    haven't gone up in the RPM really, to scared

    anybody have a good suggestion or example for an ignitoin map now that it is still NA?

    Want to get to know the MegaSquirt a bit better before I give it some juice.

    Thanks already.

    Philip

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    Re: CrossFlow 1600 megasquirt

    with mapped ignition at low speed and part throttle you can run way more advance than with a distributor, your low cr will also add to the advance required

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    Re: CrossFlow 1600 megasquirt

    So just make it look like a distributor in the map then? what kind of advance could I run do you think?

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    Re: CrossFlow 1600 megasquirt

    no its nothing like a distributor map! low down at light throttle you might even end up with a s much as 40 degrees advance, which you would reduce as the revs and load go up, and at high rpm, you tend to add more advance again. the thing with a distributor is it can only add more advance which means essentially any distributor set up is actually retarded most of the time, otherwise it would be over advanced at peak load

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    Re: CrossFlow 1600 megasquirt

    Give exboyracer a shout - he seems to have had a lot of luck with his Megasquirt 1600 X/F: http://www.turbosport.co.uk/showthread.php?t=161411
    He put the fuel & ignition maps on page 4
    Last edited by Steve~Mk1; 30-07-2019 at 14:01.

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    Re: CrossFlow 1600 megasquirt

    engine was starting and running pretty good untill I added coolant...

    my home made intake manifold leaked water to cilinders 2 and 3. didn't notice and it hydrolocked when trying to start it.

    What damage can I expect? Do I have to take it apart to look at bearings, rods, ... ?

    Thanks

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    Re: CrossFlow 1600 megasquirt

    Quote Originally Posted by L.O.R.E. View Post
    engine was starting and running pretty good untill I added coolant...

    my home made intake manifold leaked water to cilinders 2 and 3. didn't notice and it hydrolocked when trying to start it.

    What damage can I expect? Do I have to take it apart to look at bearings, rods, ... ?

    Thanks
    I'm not sure but I would say yes. Depending on how badly it hydrauliced itself, it could have gone as far a bending a rod... Not to mention the water down the bores and possibly in the oil too.
    Last edited by rallyrob; 21-08-2019 at 14:50.

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    Re: CrossFlow 1600 megasquirt

    Water was indeed in the oil...
    it didn't run because it couldn't crank over completely so a bent rod will hopefully not be the case
    is there a way to know the rod is bent when I only take the head of?

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    Re: CrossFlow 1600 megasquirt

    We had a Twink with a bent rod, we only noticed it when we had the head off and spotted one of the pistons was n't reaching the top of the bore at TDC.

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    Re: CrossFlow 1600 megasquirt

    Quote Originally Posted by Forest_rallying View Post
    We had a Twink with a bent rod, we only noticed it when we had the head off and spotted one of the pistons was n't reaching the top of the bore at TDC.
    I was going to suggest something similar, but maybe a dti on the piston crowns to see where they all are at tdc.
    But I suppose it could be obvious enough anyway..

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    Re: CrossFlow 1600 megasquirt

    If the dti shows a difference it has to come apart anyways...
    could be rods or bearings...

    Will keep you updated on the damage done

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    Re: CrossFlow 1600 megasquirt

    if it hydraulic-ed on cranking its probably ok as the engine would of stopped dead without the momentum of a moving car trying to turn it when it could be turned

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    Re: CrossFlow 1600 megasquirt

    Rings, pistons, rods are all ok

    there was one mark on the wall of the cylinder. Been a while since I uploaded pictures so i'll give it a shot later on. for now my best explanation is it looks like someone dragged a welding rod for stick welding across the wall, diagonally over a length of 4cm. approximately in the middle of the stroke of the piston.

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    Re: CrossFlow 1600 megasquirt

    Glad to hear it's okay

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    Re: CrossFlow 1600 megasquirt

    After some fueling issues, pre pump filter being to small and cavitation happening... the megasquirt is running pretty good.

    I do have problems getting the valves to be quiet... as it is still a stock cam I've set it to the recommended gap. You could hear the valves pretty good. Then I set the gap a little bit smaller to about 0.1mm less then recommended.

    The head is a fresh rebuild from Burton (see first post)

    Uprated rocker posts and shaft. All the rest is standard.

    What could be the solution to get it quiet? even less gap or perhaps new pushrods and stuff like that?

    Thanks

    Philip

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    Re: CrossFlow 1600 megasquirt

    are the rockers worn where they contact the the valves? if they are the gaps will be too big even using the correct size feeler gauge

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    Re: CrossFlow 1600 megasquirt

    If there is a spot worn in to the rocker the feeler gauge will not contact the correct surface. Correct?

    I'll have a look

    Does anyone still make a set of roller rockers for the x-flow? perhaps with bigger ratio...?

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    Re: CrossFlow 1600 megasquirt

    Quote Originally Posted by L.O.R.E. View Post
    If there is a spot worn in to the rocker the feeler gauge will not contact the correct surface. Correct?
    correct. i think IKE engineering does roller rockers, but to me there no point in using them on a standard cam

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    Re: CrossFlow 1600 megasquirt

    Ok, thanks for the tip.

    As for the cam i'm just reading up on the specs. From what I understand so far the standard cam is about the best for a blown application. Turbskies don't like valve overlap apparently.
    A little bit more lift perhaps could be better. If you have a good reference for that, very much appreciated.

    I'll have a look at the rockers and first try to get rid of the tick.

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    Re: CrossFlow 1600 megasquirt

    high lift rockers also increase lift on overlap, as you say not something you want to do with a turbo

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    Re: CrossFlow 1600 megasquirt

    I ordered a Kent 224 with a 112 LCA.
    will keep you updated when it is in, together with the Turbski

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    Re: CrossFlow 1600 megasquirt

    Does anyone remember the Piper integral roller rocker assembly for the X flow with a one piece casting and alloy cover. It was about in the late 70's early 80's.

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    Re: CrossFlow 1600 megasquirt

    Quote Originally Posted by Forest_rallying View Post
    Does anyone remember the Piper integral roller rocker assembly for the X flow with a one piece casting and alloy cover. It was about in the late 70's early 80's.
    yes, leaked like a sieve

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