AllDodge

That looks cool

ksalmine

All glass work is done! Not long way to start rigging, engine room need light sanding, epoxy prime and polyurethane top coat. Transom fairing and same coating method there.
Side floors will make a lot of rigidy to main stringers and help engine maintenance.




1961 year tank engine oil consumption is very high and it will bleed some oil from exhaust at idle. Poor piston ring design is main reason. I tried pull crankcase to vacuum but it not solve problem complete. I found solution. Nissan RD8 truck engine pistons. They are only asian market vehicles and have 23 liter natural aspirated V8 diesel engines, but main thing is they share same 150mm bore than Transmash and compression height is close. I have to cut one piston half to see how much there is room to modify combustion chamber in piston to get compression ratio in check.





Nissan piston pin is larger but I can make bronze bushings to pin bore and use Transmash pins. I want smooth piston top for maximum quench area and swirl, Transmash piston is far from that. That way combustion will be much better and cleaner burning, maybe more power and better fuel efficiency.






Another problem have found too, valve seat rings are conical! it's catastroph, if it get loose, it will drop immediatly, not good. Head aluminium is forged little over seat face, they maybe work in stock engine but when I cut better valve job, 30 degree cut will take that forging off and risk is very high. Big block Ford intake seat is close for intake seat and small block chevy intake seat for Transmash exhaust seat. American V8 engine seats can be found easily made from powder metal that I want for this.

Have a nice midsummer party and don't drown pants at ankles!

Markus

Only Finns and Swedes have midsummer parties, which leaves you and me.

I'm on the US East Cost at the moment, so you will need to celebrate midsummer for all of us...

Keep up the good work and keep the posts coming!

ksalmine

I cut new Nissan piston in pieces. They are pretty good pistons for Transmash. Thinnest part under bowl is 13mm and most of piston top is 17mm thick. Enough meat to machine bowl bigger to get right compression.
Does anyone in OSO have professional know how for diesel bowl design? I have tried to get information and think that deep re-entry bowl is best for overall performance and low soot, I want clean engine without smoke and dirty oil.

ksalmine

Summer pause is over, I had few hours time to work boat again. Now I understand why boat painting is so expensive, just cover workplace and rest of boat with plastic wrap take alot of time.
Transom is now straight and first coat of epoxy primer sprayed on. I thought that primer won't make bad fallout but I was wrong, everything have to cover with wrap.
Extension box holes and bolt pattern are drilled, tomorrow I will spray more primer to transom and soon to engine comparement. Transom should be sprayed many times because I have to make epoxy thinner so it will come through paint gun. When thinner evaporate it make tiny pinholes to paint and it's not so water tight than you imagine, more layers help because pinholes won't be in same spot.
Transom and engine comparement will be black, I'm bored to clean black fingerprints, soot and oil stains from white surface.






Every step forward from now make job nicer and nicer, no dust or resin odors anymore after paint job is done. Just put together ready for assembly parts, electrics and hydraulics. I'm waiting for that.

AllDodge

Looking good !!

Markus

Vegarheim Kulturhus?

What’s the history of the boat?

ksalmine

I don't know history before this facebook site
https://www.facebook.com/profile.php...ion__open_user.

Boat was used Skagerak Across race when it was in Norway. It was triple 525 boat then but when I redo transom, there had been much bigger transom assemblies than bravo before.

ksalmine

Engine room and transom are now painted. I paint them black because I tired to clean white surfaces. Finn paint company Tikkurila make very good products, RM40 epoxy primer and Temadur polyurethane paint are awesome.





I test assembly splitbox also, there was few little design errors but all go together pretty good. It's nice to see some real parts after many hours of CAD drawing. Straight cut spur gear noise will be loud!





This is good example of design error, Spline is 0.7mm too long so bearing race touch spline end before spur gear, 1mm thick washer solve problem. I'm not disappointed, big companies have dozens of engineers and still they make mistakes and alot of time. One man design and manufacturing does what you can. Spline could be grind shorter but rather I put shim than grind nitrided hardened shaft spline shorter.



Split box case is so tight fit that I have to grind inside weld seams down so gears have enough room to spin. Oil fill, suction, return, balance and breather connection holes have to drill next.

ksalmine

How to clean your garage from glasfiber dust?
Of course by paramotor, just put it in full send front of door and open back doors. There was about 30 knots wind inside, then take compressed air gun and blow all sheves, corners, tools and boat, air stream take dust out. I do not recommed do this way in densely populate suburb....

Cleaning garage take some time before boat assembly start, I have to get all dust away so my little assistant can come help me.