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    Hello all, Sorry for the delay. Since the...

    Hello all,

    Sorry for the delay. Since the initial assembly in 2016, I moved to Idaho and built a horse ranch. Just now getting back into engine building. Look for updates this fall.

    Tim
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    Sticky: Pics or it didn't happen

    Pics or it didn't happen.....
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    Sticky: Breaking news: +.065 oversize Mod-50 replacement...

    Breaking news: +.065 oversize Mod-50 replacement pistons now available!

    Wiseco just approved manufacture of +.065 oversize pistons for the 49.7 CI OMC loop triple. This means you can breathe...
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    Sticky: Hey Xpress2830, New CNC turned with fasteners...

    Hey Xpress2830,

    New CNC turned with fasteners for $55 each plus $6 for a USPS flat rate box. Email tkurcz123 at gmail.com[/QUOTE]

    Tim
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    Sticky: Wiseco forged replacement OMC 49.9 Mod-50 pistons...

    Wiseco forged replacement OMC 49.9 Mod-50 pistons are now available. They are improved versions of the #10908 previously supplied by the late Phil McDaniel. Designed for use with the Mod-50 or...
  6. River drags

    If only I lived closer, you'd see me on the course.

    Just trying to be helpful and provide solutions to make your racing faster.

    The new shop is just now ready for work. First up: Six 7-1/2"...
  7. The bearing carrier is epoxied in place per...

    The bearing carrier is epoxied in place per Hydroplay's recommendation. Exhaust path is through the (now above water) housing as required by APBA rules. So far, we've had no issues with the carrier...
  8. Low water pickup

    61806Here's an answer to your gearcase lift issues: Water pickup low in the skeg leading edge. Get the entire case out of the water.
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    Head west

    Hi Al,
    Actually departing Michigan for the mountains, lakes, and rivers of Idaho. The shop will be down for a few months; but you'll see updates in September if BRF behaves itself! Have a great...
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    Forced induction

    Precisely: The crankcase is an open plenum; the crankshaft is supported by reed cages with no reeds. Cylinders are fed with air-fuel mixture supplied by the turbocharger.
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    Many thanks

    Many thanks to Dick Austin for posting images. The 888 looks fearsome, and will run early fall; a move will delay completion. More images and detail will be posted as progress occurs. Have a fun...
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    Moving blues

    Likewise..... 28 years here. Moving the machine tools, fixtures, engines, and parts is way worse than the house!

    Tim
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    Mock up looking good!

    If BRF is behaving itself, images of the 888 mockup are attached; looking vicious! This is the extent of my work until fall due to an impending move. Look for updates in September. If all goes...
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    Progress images

    Hi Al, Pretty sure Dick and I have the corner on the radical outboard projects business lately. The site is not letting me load images, but the oil pump & methanol tank have been fitted, and the...
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    That would be rapid prototyping for those...

    That would be rapid prototyping for those unaware...... Absolutely!
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    End cap work

    The top end cap was machined and now sports the Firefly pickup stator installed. Images also show the rotor that includes 5 magnets. On the bottom end cap, the two original front mounting bosses...
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    Welding done

    The carb adapter and end cap welding is done. Parts are en route; machining of the cap and trial assembly will happen memorial wee61023kend.
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    Lowest water pickup

    61022
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    Ignition system correction

    Apologies all; The Firefly ignition is an inductive ignition system (not CD).
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    Starter

    Actually, the flywheel is a 9-1/2" Merc 1000 compliments of Steve Wheeler at Wheeler's Marine. The larger diameter was needed: With the standard front cover gone the starter couldn't be mounted...
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    Ignition system

    Ignition will be provided by Matt Richardson who developed the "Firefly" capacitive discharge system for the Oregon river racers. He bench tested a version modified specifically for the 888 that...
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    Cooling and ignition

    While the carb adapter and bottom end cap are at the weld shop, it was time to complete the cooling system, locate the ECU and methanol tank. Watering will be as Mercury designed it except the rear...
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    Accessories

    Tight turbo packaging made internal block watering risky, so bypass channels are fed externally. Two bolt bosses were removed from the bottom end cap, and a new one will be welded into place: There...
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    Clearancing the block

    A couple hours were spent making room for the rods, basically duplicating the prototype cutout. Fitting this weekend will include making weld bosses for the bottom end cap, and slotting back-to-back...
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    Rods have been honed round to 1.137", pins were...

    Rods have been honed round to 1.137", pins were cut & fitted to links. Block clearancing and test assembly is planned for this weekend. If all goes well, pins might be tack welded early as Monday. ...
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    Link rods pic

    6098860987Thanks to Dick for posting the text. Hopefully this image posts.
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    BRF won't behave

    Tried again with upload failure, both from computer and iPhone. Will attempt to start another thread next week, or ask one of you to post for me. Any volunteers? Email nav27k at Comcast.net
    Thanks!
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    Progress update 888

    Several attempts to update failed. This one is by iPhone in hopes of getting through. Thanks all for your interest and patience. Master and link rods are complete. Crank train fitting begins this...
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    Sticky: Yep, that one's one of only three built with...

    Yep, that one's one of only three built with enclosed exhaust for harassment-free laking. Enjoy!

    Tim
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    Sticky: Pipe size

    Experimentation suggests that 150% of the exhaust port area with a 25% choke immediately downstream of the #3 cylinder followed by a 3 degree divergence cone is a good starting point.
    Best of luck!
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    Thanks to all for your input. An update with...

    Thanks to all for your input. An update with images was attempted, but an internal server error precluded the post. I'm hoping this quick reply gets through. Another attempt will be made later...
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    More work to go

    The first production link is only about 50% machined as shown. The pivot end must be slabbed from .625" to .585" to increase clearance from the crank cheeks (.640" between cheeks). Then, the wrist...
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    Complicated!

    Amongst other projects today, a few hours were devoted to the link rods. The first is always the slowest. Hoping to fit the first production rod this week.608376083860839608406084160842
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    Sticky: Way to go, Dick! It will be interesting to learn...

    Way to go, Dick! It will be interesting to learn what makes the difference.

    My guess is local law enforcement may pay you a visit about the time you get the 5th carb dialed in........ LOL!
    ...
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    Master rods yes!

    At last, a few hours in the shop, and voila! Today the masters, tomorrow the links. Another couple weeks and assembly is possible.....608266082760828608296083060831
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    Production resumes

    After two months work constructing a customer powerhead dyno (a Stuska water brake), it's back to work on the 888.....
    A fixturing jig was machined, rods prepped, and new copper heat sinks were...
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    Case hardnening

    Industry sources report that 60-64 Rc is used for roller bearing support today. It's entirely possible there was some degradation in location #4, as the entire rod did experience heat soak during...
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    Rockwell C

    At long last, Rockwell C hardness test results are in. Interestingly, the area between oxidation marks showed the lowest surface hardness(?) Evidently, discoloration is not necessarily an indicator...
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    Making a rod

    It took over twenty trial fittings and adjustments to make this one (note beginning shape). It was necessary to cut intake and exhaust side rod reliefs deeper, and remove 3/8" of the intake side...
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    Back to work

    Expert welder Chris Razor suggested a conforming aluminum heat sink might allow welding of the blade/cap joint with little or no damage to the hardened case. An aluminum bar was turned to .003"...
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    No doubt

    Great research! It's always great to learn from the experience of others. While the blade and fork rod would most certainly be a stronger and more elegant arrangement, there is no room for luxury...
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    Rod update

    Thanks all for your thoughts on rods. Welder extraordinaire Chris Razor suggests clamping the rod to a 6"-8" long cylindrical aluminum heat sink. He says it will absorb heat from the blade welding...
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    Building rods

    Most outboard rods are forged steel, copper plated (carburize mask), rough machined (removes copper plate from intended surfaces), assembled, carburized, then finish machined (ground/honed). Copper...
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    Custom rods

    Basically, that's what is planned for the 888. A prototype will be built welding a "blade" to the existing Mercury rod cap. The matching "fork" will be machined into a custom link rod. These will...
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    Fageol 88

    Fantastic! The concept has been built before; at least in 4-stroke form.

    Excellent image contributions, all. Please keep them coming!

    Tim
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    Hose clamps

    The hose clamp is an excellent fixturing device that enabled easy bracket mockup. Once the spanner is welded, a cross bolted support will be added to the starters inner bottom stud. The clamp will...
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    Critical infrastructure

    It's been hectic lately, and progress has been slow. Critical parts acquisition includes a Merc 1000 flywheel with 9-1/2" ring gear from Steve Wheeler, and a Merc 500 starter motor from Doug Kay. ...
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    Hybrid master & link

    If/when the concept is proven, a more robust design might be built.

    Nice pics of the corn cob! Are the Merlin and R-4360 your pieces?
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    Electric turbo & more

    Answering a few questions:

    1) I looked at the electric turbo right until the price tag appeared, then, thought about building one myself. Not knowing if the engine would even run, I opted for the...
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    Wankel hybrid

    Kinda cute; a cross between a Wankel and reciprocating two stroke.
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