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Thread: Tri-Z Engines

  1. #31
    Join Date
    Mar 2010
    Location
    Slidell, LA
    --
    4,737
    Quote Originally Posted by El Camexican View Post
    Today I worked up the nerve (took only 3 beers) to add a second boost port to the cylinder. This one is a little trickier than the Tri-Z cylinder because the intake is angled to the left. Eric Gore says to drill a 1/2” hole on this cylinder and I’ve seen the mod. Frankly it looks stupid, so I decided to get a little more creative.

    Attachment 263535

    Attachment 263536

    One small hole as a reference

    Attachment 263530

    Then another

    Attachment 263531

    Attachment 263533

    Unlike the Tri-Z that’s prone to cracking after this mod I don’t think I have anything to worry about. There seems to be more material in this area on the YZ cylinder and the mounting base seems to be thicker as well. Time will tell.

    And there it is.

    Attachment 263532

    Attachment 263534
    Can’t see pics el....
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    Need something blasted or polished or both? Send me a PM

  2. #32
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    That’s weird. They were there a little bit ago.

    Took them on a new Apple 11 and got a message that I didn’t have permission to post, so I sent them to my old 7 phone and was able to put them up. Will try again.

  3. #33
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Here goes again.

    Crack

    Click image for larger version. 

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  4. #34
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Here’s the epoxy setting up in the transfers.

    Click image for larger version. 

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  5. #35
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Ok, seems to be working, here’s the rest.

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  6. #36
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Found a number of voids in the casting that needed epoxy since the last post. Got back on it today and finished it as far as I can without the bottom end and head.

    So far the port timing hasn’t been changed and probably won’t. The widths of the transfers have been slightly increased and the angles have been matched, the boost port has been added and the exhaust ports have been polished. Took a little material off the skirts of the sleeve to try and enhance the entry of the fuel mix into the transfers. Jury is still out on whether or not it’s going to cause them to brake.

    Click image for larger version. 

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  7. #37
    Join Date
    Jul 2010
    Location
    Arkansas
    --
    2,196
    Quote Originally Posted by El Camexican View Post
    That’s weird. They were there a little bit ago.

    Took them on a new Apple 11 and got a message that I didn’t have permission to post, so I sent them to my old 7 phone and was able to put them up. Will try again.
    The pictures on the newer phone may be larger, more resolution. I've gotten the same message before, compressed the file an it uploaded. Several free file compression programs available online. Maybe sending them to the other phone compresses them.
    The story of three wheels and a man...

  8. #38
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Quote Originally Posted by ATC King View Post
    The pictures on the newer phone may be larger, more resolution. I've gotten the same message before, compressed the file an it uploaded. Several free file compression programs available online. Maybe sending them to the other phone compresses them.
    That seems to be what’s happening, thanks!

  9. #39
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Click image for larger version. 

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    ..........

  10. #40
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
    --
    2,446
    Looks pretty symmetrical.
    Red Rider's Sand Machine Updated 07/23/14

  11. #41
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Click image for larger version. 

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    ..........

  12. #42
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
    --
    2,446
    Okay.... So your not checking to see if your boyessen ports are symmetrical. You’re temporarily plugging them, so you can build up the casting around them, or for a smoother transition from cylinder to bottom end?
    Red Rider's Sand Machine Updated 07/23/14

  13. #43
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Quote Originally Posted by Red Rider View Post
    Okay.... So your not checking to see if your boyessen ports are symmetrical. You’re temporarily plugging them, so you can build up the casting around them, or for a smoother transition from cylinder to bottom end?
    I was wondering if anyone would notice the silicone in the first photo.

    So I’ve been looking at and reading up on the so called Boyesen ports and it seems that angling them downward a bit and putting a divider between them and the rear set of transfer ports aids the piston in drawing mix into the cases as well as better directing the mix up into the cylinder on the downstroke.

    The wood dowels will be drilled out when the epoxy is cured so I can follow the angle and get a burr in there.

    I’m also planning to trench the cases a bit so that the Boyesen ports really get a nice clear shot at the crank. Should also help lubricate and cool the lower rod bearing a little.

    Or maybe it does nothing and grenades on its maiden voyage

  14. #44
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
    --
    2,446
    Quote Originally Posted by El Camexican View Post
    I was wondering if anyone would notice the silicone in the first photo.
    I did, but it didn’t surprise me, as I’ve seen your engine builds before.

    Interesting. I thought the diameter of the dowels looked a bit small to be plugging the ports completely. So the silicone is simply holding the dowels in place for the epoxy process? It’s good to you back at this project.

    Quote Originally Posted by El Camexican View Post
    Or maybe it does nothing and grenades on its maiden voyage
    Let’s hope that isn’t the case.
    Red Rider's Sand Machine Updated 07/23/14

  15. #45
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Quote Originally Posted by Red Rider View Post
    I thought the diameter of the dowels looked a bit small to be plugging the ports completely. So the silicone is simply holding the dowels in place for the epoxy process?
    Yes, just to keep the epoxy from oozing past the dowels. That stuff is a bear to remove.

    BTW, ”Vato” Zone of Mexico stopped carrying the standard version of JB Weld

    They only sell the specialty epoxies now, none of which I’d want to do this with. I need to find a source here to get this finished.

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