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  #91  
Old 3 Weeks Ago
MatHormell's Avatar
MatHormell MatHormell is offline
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Originally Posted by mac93 View Post
Update, made some changes, dual plugged the heads and went with a coating on the piston skirts. Trying to keep the pistons from rocking. I feel the rpm we were running is beating them up. Also added .010 to the head gasket just in case there’s still some piston rock. First time out with WAG tuning he was dialing a 9.50, had way to much wheelspeed on the hit so just dialed for it and raced. According to the plugs timing ( to much advance ) and jetting ( a little lean) were off. Even with the tune up off he had the power he needed, 139 mph, to race the stripe. Still was able to get the win. Did a leak down after the race and the rings are not seated yet. Hope they get better. Looking at running a 9.70 index that’s starting up around here. As far as the cases it looks like the repairs are holding up good. We’ll see what the season brings.
was it L2L you used for the skirt coating? I just had mine done as well. not back together yet, but curious on how it has worked out and if and what noticeable difference you have seen?
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  #92  
Old 3 Weeks Ago
mac93 mac93 is online now
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Yes, we’re trying line2line coating on the piston skirts. To early to tell but I did notice the engine was harder to turn over when I first put it together. You can feel the drag in the tight piston wall clearance. Seems to be freeing up but being a track only bike I hope it works out like it should.
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  #93  
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MatHormell MatHormell is offline
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Originally Posted by mac93 View Post
Yes, we’re trying line2line coating on the piston skirts. To early to tell but I did notice the engine was harder to turn over when I first put it together. You can feel the drag in the tight piston wall clearance. Seems to be freeing up but being a track only bike I hope it works out like it should.
Yea they did mention it would be harder to turn over until it hones its self to fit, I plan do to dyno break in pulls to hopefully speed up the process, in their studies it's full fit to size around 500 miles.. I'm just going to follow their break in instructions on the dyno and see how it goes

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  #94  
Old 4 Days Ago
mac93 mac93 is online now
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Got the boroscope out and looked at the piston and cylinder. Had enough detonation on the rear cylinder to eat away at the coating a little. Front was much better but showing signs. Might have learned something there between the two. I was way off on the timing, all my fault, I got sidetracked. I would post pics but have no idea how. The leak down was 20% after the race, all past the rings. This was after normal heat cycles and a ride around town. Learned that’s not enough, haha. Usually spend more time on break in but ran out of time before the race. Corrected the timing and been riding it around hoping to improve the ring seal. Got it down to 5%. Should be more like 2%/3% at this point. Oh well. Is what it is, when it’s race day you race. If not. Listen to the builder and TAKE THE TIME it takes to do a proper break in!!! That said, the win was worth it!
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  #95  
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Dang! You’ll get it and good luck next time out. Soon?

Doesn’t sound like much wiggle room on how you break in the axtells.
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  #96  
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