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I just got off the phone with Hammer. Long story short, one piston and ring pack is on the way.
I've decided to hone both cylinders and reuse the rear as is. I like the clearance, the damage ain't bad enough to justify boring, and going forward I'm gonna pour fuel into that damn motor like a fuggin fire hose!
At 260 ccp you don't have a normal engine, you have a pressure cooker. Can't think normal jetting on this one, she is going to be touchy especially on a throttle roll on. Get it safe.
Tried to think normal jetting for afr's with the 130" in the White Bike, it did not like a traditional cruise 13.8-14.0 or 13.2 WOT (detonation) pulled it back to 13.2 cruise and 12.8 WOT and has been reliable going on it's 4th season. Sometimes the normal book is thrown out the window with a not normal Evo.
At 260 ccp you don't have a normal engine, you have a pressure cooker. Can't think normal jetting on this one, she is going to be touchy especially on a throttle roll on. Get it safe.
Tried to think normal jetting for afr's with the 130" in the White Bike, it did not like a traditional cruise 13.8-14.0 or 13.2 WOT (detonation) pulled it back to 13.2 cruise and 12.8 WOT and has been reliable going on it's 4th season. Sometimes the normal book is thrown out the window with a not normal Evo.
Good points, thanks. BTW, I fixed the high CCP issue. I never preloaded the damn intake pushrod on the rear cylinder Now they both (or, were) very even at around 210. Even with the scuffed cylinder, they were still both around 210.
All true and good reference, but Twinkies got oil squirters, which will keep the piston cooler at any AFR than Evos. That certainly helps.
And I'm not sure about this but does the 110 come with cast or forged pistons? That makes a difference with heat expansion as well.
It's a '09 that started life as a 96", drop on SE 110 kit that comes with Mahle pistons, which I like, the pistons are coated and
are forged 4032 alloy which is similar in expansion to a cast piston, measured at .0014" piston to wall clearance, scary huh.
copy from their site,
Forged from 4032 aluminum for tighter cylinder wall clearances and quieter operation.
Forged 4032 alloy with grafal anti-friction coating on skirts.
Phosate-coated to reduce micro-welding and pin galling.
Pin bors finished on CNC boring equipment.
High strength 9310, light weight nitrided steel wrist pins.
1.2 steel nitrided top rings, 1.2mm napier cast second rings.
3mm low tension oil rings.
It's a '09 that started life as a 96", drop on SE 110 kit that comes with Mahle pistons, which I like, the pistons are coated and
are forged 4032 alloy which is similar in expansion to a cast piston, measured at .0014" piston to wall clearance, scary huh.
copy from their site,
Forged from 4032 aluminum for tighter cylinder wall clearances and quieter operation.
Forged 4032 alloy with grafal anti-friction coating on skirts.
Phosate-coated to reduce micro-welding and pin galling.
Pin bors finished on CNC boring equipment.
High strength 9310, light weight nitrided steel wrist pins.
1.2 steel nitrided top rings, 1.2mm napier cast second rings.
3mm low tension oil rings.
Interesting. Of course, Harley doesn't actually make their own pistons, they farm it out. Mahle looks like a pretty solid outfit when it comes to making pistons. From their website, they do cast and forged. I could see HD farming out the specialty kits like the 110" kit to some real piston pros.
Based on your clearance, that's cast territory. But that's entirely based on the composition of the piston. My past builds with forged pistons (mostly Weisco) is 2.5 thou. My last cast iron cylinder 88" Sportster ended up at 4 thou with CP forged pistons. This current engine is also gonna be 4 thou when done (also CP pistons).
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Now they both (or, were) very even at around 210. Even with the scuffed cylinder, they were still both around 210.
