I really lost myself this weekend
Club Member
Joined: Apr 2011
Posts: 5,816
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From: SE Louisiana
Noticed you said timing was retarded, which also can cause overheating, depends how retarded.
Install some O2 bungs up by the heads so you get good readings and can check each cylinder individually.
Install some O2 bungs up by the heads so you get good readings and can check each cylinder individually.
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Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Already on top of the O2 sensor relocation too. Some night this week I'll cut the old one out and move it up front.
Road Master
Joined: Dec 2016
Posts: 981
Likes: 182
From: Fairfax County, VA
Completely eliminated an oiling problem I guess? Running lean enough to do that damage in that little time, AND not recognizing any performance symptoms from extreme leanness does NOT get my vote... Not saying it isn't possible but to not notice the surging and power drop, idle characteristics and throttle response issues, popping...
Anyway, really sorry to see this outcome Matt. **** happens and a step backwards is not the end of the world. Keep at it, you are almost there!
Anyway, really sorry to see this outcome Matt. **** happens and a step backwards is not the end of the world. Keep at it, you are almost there!
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Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Completely eliminated an oiling problem I guess? Running lean enough to do that damage in that little time, AND not recognizing any performance symptoms from extreme leanness does NOT get my vote... Not saying it isn't possible but to not notice the surging and power drop, idle characteristics and throttle response issues, popping...
Anyway, really sorry to see this outcome Matt. **** happens and a step backwards is not the end of the world. Keep at it, you are almost there!
Anyway, really sorry to see this outcome Matt. **** happens and a step backwards is not the end of the world. Keep at it, you are almost there!
Embarrassingly enough, this is the 3rd Harley I've done this to.
First was a 1200 conversion on my 96 Sportster. Well over 100 miles of county roads, but the first time I get it up on the highway power falls off and oil is coming out of the breathers in liquid form (not mist). Both pistons were shot on that one. Fixed it and increased the main jet about 8 sizes.
Second was my 88" conversion on the same Sportster. Since nobody has jetting settings for the CV44 on this displacement bike I shot for what I thought would be good. Same thing, hit the interstate after a few hundred miles and POP. Not as bad as the first but definitely damaged. Only the front cylinder that time, I honed out the rear cylinder and put everything back together. That kit was the Axtell 88" kit with CP pistons from NRHS. Fixed it by raising the main jet and needle a lot.
Third is this one. Believe it or not I have actually built some successful HD's.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
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From: Ohio
Any input is always read here right or wrong, I have a ASE masters also and run big Harley engines, they will run below 14.1 all day long. Don't have the energy to get into a fact and pissing contest, just going to go with welcome to the Evo Forum and a forum is to give opinions from experience in a attempt to help a member.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
Likes: 7,640
From: Poolville
Any input is always read here right or wrong, I have a ASE masters also and run big Harley engines, they will run below 14.1 all day long. Don't have the energy to get into a fact and pissing contest, just going to go with welcome to the Evo Forum and a forum is to give opinions from experience in a attempt to help a member.
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Grand HDF Member
Joined: Nov 2009
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From: Tampa
I can see 14:1 working on a cast iron piston, liquid cooled engine, as long as it's a monitored 14:1 thru some kind of fuel injection.
But on air/oil cooled engines theoretically designed in the early 20th century, nope.
But on air/oil cooled engines theoretically designed in the early 20th century, nope.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
Likes: 7,640
From: Poolville
I use a Wego III to set up my afr's on a carbed motor with forged pistons an for just normal daily driving it's 14.2. (Stoic is 14.7 the optimal ratio) 14.1 is not lean by any means, forged cast doesn't matter...... For wot I mark 13.6-13.8..... Never an issue...
One more thing my pistons are set to .0035"-.0004" Forged...
One more thing my pistons are set to .0035"-.0004" Forged...
Last edited by 98hotrodfatboy; Apr 11, 2018 at 01:44 PM.
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Grand HDF Member
Joined: Nov 2009
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From: Tampa
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!
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!
Seasoned HDF Member
Joined: Oct 2015
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From: Pine Flat Dam/South Bay Area, CA
Break it in nice & slow. Let the rings seat before you rev it up. Hot gasses passing by unseated rings make the piston skirt expand very rapidly leading to seizure. Cast iron cylinders amplify the problem, too.