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PostPosted: Wed Dec 04, 2019 7:44 am 
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cribbj wrote:
Dayum that's a lot of corrosion for 1-2 starts? Almost looks like a flood motor.


Remember the leaking intake ports? I assume this is the legacy....I guess coolant trapped between the rings for the couple months it took me to repair the head?

The scoring in #1 I don't understand....no marks on the piston I can see...all I can figure is maybe during the retarded timing incident the top ring heated and was digging in? Thats all i got other than its scrap now which I guess is all that really matters.


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PostPosted: Wed Dec 04, 2019 7:57 am 
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FoaTech wrote:
That clearance for a forged piston is right, .003 was too tight. .004 will be just fine. Ferrari was covering an engine rebuild years ago and delayed me in tearing it down. Broken valve had cracked a head and coolant was in every cylinder. by the time they agreed and let me take it apart, the coolant had killed every sleeve. It doesn't take long.


Way back in my H-D racing days I set my bike up at .004 (nearly the same bore as this engine) as the manufacturer suggested. That's the way I ran it hillclimbing (on dirt, not roadracing) but when I went roadracing with the same 4 it blew smoke at the end of the straights when I snapped the throttle shut and I was having a terrible time with air pressure in the oil system. My H-D buddy asked what I'd done with the piston clearance and was horrified by the 4 number....no, no, no, 1-1.5. I was like really? That was magic, no more oil issue.

Since then I've been scared of going too loo loose. Thinking it through I guess the H-D cylinders get a whole lot hotter than a water cooler cylinder so it will expand more with the piston I guess and can't really be compared to a water cooled engine.....so 4 it is with the cylinder stone cold.


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PostPosted: Wed Dec 04, 2019 10:02 am 
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mk e wrote:
it blew smoke at the end of the straights when I snapped the throttle shut and I was having a terrible time with air pressure in the oil system.


I'm sure you know that oil burning when throttle is shut is also a sign of loose valve to guide clearance. The vacuum caused by the snapped throttle sucks the oil past the guides.


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PostPosted: Thu Dec 05, 2019 10:44 am 
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Chips! Chips! Keep up the good work.


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PostPosted: Thu Dec 05, 2019 4:01 pm 
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cribbj wrote:
I'm sure you know that oil burning when throttle is shut is also a sign of loose valve to guide clearance. The vacuum caused by the snapped throttle sucks the oil past the guides.


Yes, but in this case it also came with an overflowing oil catch can on the crank vent and new cylinders honed to 1.5 clearance completely fitted the issue. I guess the pistons can start rocking causing pressure in the case and oil everywhere. I ran into another H-d racing at Dayton and he was complaining about the same catch can issues....pistons set to 4

Darton says 5 more cylinder blanks will ship tomorrow, then a week with UPS. I guess I move back to the heads and see about getting the seats replaced while I wait.


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PostPosted: Thu Dec 05, 2019 4:10 pm 
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Rocking pistons and that much blowby at 0.004?

Whoda thunk it...... But as you say, maybe that's the difference between air & water cooled?

Anybody know what Porsche clearances are for their aircooled engines?


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PostPosted: Thu Dec 05, 2019 7:43 pm 
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Pulled the seats out of the damaged head. It went pretty smooth, only pulled the weld of 1. They were a bugged to weld, they bubbled and spit metal onto the tungsten but o got them.


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PostPosted: Fri Dec 06, 2019 7:05 pm 
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I popped the rest of the seats out then remember I never faced the 2nd head to match the 1st so I took care of that


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PostPosted: Fri Dec 06, 2019 7:14 pm 
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With the seats all out I realized theres no way the same size seats, that I bought back in August are going to work. The book says the press should be 0.0035"..... I think the are int the 0.001-0.000 range, so I need more new seats.
Called the place got them from, which even though it's the manufacturers web site when you click buy the order goes to a 3rd party service, after 15 minutes on hold I got " we have a 30 day return policy and this is past that time sir.....". Called the manufacturer and was told the 3rd party handles all there sales blah blah....Lana's more pissed than I am.

I'm going to replace the guide in #8 and closer inspection found 6 guides that are wonky and never should have been installed. It looks like I pushed the drill too hard and drilled not so straight....centered inside the port, not so centered at the stem seal :oops:


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PostPosted: Fri Dec 06, 2019 7:17 pm 
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I also added a little more weld in the damaged port. On the exhaust side between the seats it didn't quite keep up when I was milling the chamber...better to have extra.


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