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It is wild. IMO the breathing requirements aren't related to cc, but rather hp.

That bike is making about 80 hp per cylinder, which is a lot but not way more than something like an LS or BBC making 600 hp. That large primary necking down to a small muffler outlet will send positive pressure waves back up the exhaust - maybe that has benefits similar to the "stuffing" phase of a 2-stroke expansion chamber? I could see that working if the cam has an extra-long exhaust duration.

Valves are ordered and PennDOT delivered my Christmas present

Yeah.....I was having similar thoughts

For all to enjoy the seer insanity...in Ti for only 3415 euro before tariffs


We are thinking WAY simpler and probably also quite a bit lighter. It would end at about the tape lines


But as I said the 2 pipe are quite different lengths and make different simulation graphs so I guess the truth is about in the middle if we do 1&1. Victor ordered the bits needed to build it so now that waits for parts and the sealed lower fairing and probably a composite or maybe aluminum rear tail section begin
For all to enjoy the seer insanity...in Ti for only 3415 euro before tariffs

The bmw flywheel hit t5he mill today and is 1/2 done. it started at 24lbs and is now 17.4 with the plan to get it to 14.




I got him setup up and he milled all day and did pretty nice job. I have to say I was a little disappointed when I was he left like 3/16 all the way around the clutch disc.


But that forced me to be in the shop most of the day and after clearing the bench


I got the 1st head out and starter working to seal it so I can leak test the intake ports. The little plugs I bought for the valve guides turned out to be a bugger to install and after getting 1 in place after 30 minutes I decided to trim them


then clean and install the covers


I still need to figure out how to seal up the cam drive end and the oil return holes but tomorrow is a new day.

To close the look on the flywheel:




24lb to 14lb so he was pretty happy....happy enough that as we were chatting engines and I mentioned my piston rings were not loose, they are nitous safe he told me he's got a couple nitous tanks he's be happy to donate to the project....I'm nlot sure that's the kind of help I need

I realized twice today that I'm an idiot. First I made a couple covers to bolt on and seal up the oil return holes....hmmm...I already put the cam cover on so no way to bolt on the new return hole cover but maybe RTV will hold them. Then I made a fancy wood cover for the cam end since the mill was busy, I figured at least give it a try. Once that was on I was kind of looking at it and realized the head bold holes need to be sealed but the cam cover is still already on so more rtv and see what happens I guess. Oh, and i forgot I also need 2 exhaust valves...3 times an idiot.

The wood wasn't a great ide. It turned out there was or it developed a large crank


That should be fixed now


But the RTV needed 24 hours and Victor was waiting for fairing help so we jumped on that so its on the bench not the head at least though today. The plan is make a 1 piece copy then Frankenstein that until it looks right and is a catch pan, then probably make a nice light copy. Working on the 1 piece mold now. I think this should all be considered practice for the lightweight 30-8 deck lid and targa top projects.

We need a dedicated Ducati thread!

Merry Christmas Mark. I hope you and the family have a great day!

The ducati does keep eating my time. The exhaust kind of looks like something now...when the actual mufflers arrive it will need brackets but done for now.



The 1 piece lower is getting an addition


But I did leak test the head and it worked this time.



...and I'm rethinking my plan. The leaks are tiny, mostly just annoying, and horrible to reach with the tig torch. I'm going to clean up the back side of the welds inside the cam galley and seal it with epoxy and just move on.

I was hoping for serious car progress today. Out to the shop....son left quite a mess so got that cleaned up, cleaned up the head and got it on the mill ready to recut the damaged chamber and this showed up


a 24k btu mini split that is supposed to work down to -30F so I shouldn't need any backup heat and I can be done with the little space heaters I've been using. Inside unit is on the wall


Tomorrow I need to figure out mounting the compressor outside. The warranty is void unless a licensed installer turns it on so the plan is get it mostly done and call someone to finish-up and sign it off.

....and the new(ish) shop air compressor died, it just hums so I need to look a bit closer at that Its not the compressor, that, turns fine so maybe a capacitor on the motor...hopefully

Oh, and I had asked it there was a quantity discount on the valves, heard nothing back and ordered them. The day after they arrived I got a discount code. Wrote back and they comped me the 2 exhaust valves I forgot to put on the 1st order so that was nice.

I stared by looking at the compressor...this won't do.


Its a screwball part but it looks like the next larger size that is a very common part will fit so that it way.


Then machining the combustion chamber. clean up the gasket surface



Then a game of touch off on a good chamber and match the number in the damaged one



This just roughs it, then I'll play connect the dots with the die grinder as the last step. Next up is cutting the bores for the new seats. I started setting up the intakes and then was needed elsewhere so seats in tomorrow.