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Author Topic: Scored cylinder wall  (Read 1317 times)

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Lance0964

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Re: Scored cylinder wall
« Reply #15 on: April 04, 2019, 08:13:41 PM »

The compression addition is the torque plus. The pipe is far more influence on the shape and torque production throughout the curve.
I got a Bassani Road Rage B1 2-1 Exhuast on my bike. It seems better than stock, but I’ve no comparison with other pipes.
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Lance0964

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Re: Scored cylinder wall
« Reply #16 on: April 04, 2019, 08:17:38 PM »

In regard to the Carbon build up on the piston crowns, thats due to the breather system in operation from the factory, fit an external breather/catch can and that will reduce it.

That’s a good idea. I did see engine oil in the throttle body. Maybe I should try that. Thanks
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HD Street Performance

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Re: Scored cylinder wall
« Reply #17 on: April 05, 2019, 09:52:12 AM »

Truth be told your pictures don't look that bad. There is evidence of being hot however. A little of the coating off the skirts is normal, the carbon is not excessive, a few minor scratches you can not likely even feel. Blowby is bad ring seal and that is the root cause of issues along with the tune. The venting to the outside is a band aide. Taking the cylinders and having them properly honed in torque plates square and true to proper size and hone pattern seals them right up. Then a tune that isn't on the bleeding edge of lean or too much timing and all the issues go away and these motors can lead a long life as long as the lifters are changed as a maintenance item.
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Lance0964

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Re: Scored cylinder wall
« Reply #18 on: April 05, 2019, 12:23:56 PM »

Truth be told your pictures don't look that bad. There is evidence of being hot however. A little of the coating off the skirts is normal, the carbon is not excessive, a few minor scratches you can not likely even feel. Blowby is bad ring seal and that is the root cause of issues along with the tune. The venting to the outside is a band aide. Taking the cylinders and having them properly honed in torque plates square and true to proper size and hone pattern seals them right up. Then a tune that isn't on the bleeding edge of lean or too much timing and all the issues go away and these motors can lead a long life as long as the lifters are changed as a maintenance item.

Thank you for the input. I didn’t realize the cylinders are bad until I brought them to a local shop for measuring in order to fit the 10.5:1 pistons. The guy told me better to get .010 over size pistons which I did. I’m now waiting for the cylinders to be bored and honed. S&S lifters are on the list for sure.
Can I use a can map from fuelmoto to start the bike after bolt everything back, then ride it to the shop for dyno tune?
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HD Street Performance

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Re: Scored cylinder wall
« Reply #19 on: April 05, 2019, 12:48:29 PM »

Very seldom are standard pistons going to work well. The bores distort due to design, overheating and other issues. This is not wear. I would start it. Check for leaks and noises. Then straight to a tuner that understands how to break them in and control heat. This is not wailing on them right away. There is a lot of low speed tuning and starts and stops. The process breaks them in fast if the bore and hone are right.
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Lance0964

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Re: Scored cylinder wall
« Reply #20 on: April 08, 2019, 10:13:30 PM »

Very seldom are standard pistons going to work well. The bores distort due to design, overheating and other issues. This is not wear. I would start it. Check for leaks and noises. Then straight to a tuner that understands how to break them in and control heat. This is not wailing on them right away. There is a lot of low speed tuning and starts and stops. The process breaks them in fast if the bore and hone are right.

Appreciate your advice. I will do so when I get my cylinders back.
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MCE

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Re: Scored cylinder wall
« Reply #21 on: April 13, 2019, 03:09:11 PM »

.005 over pistons usually are enough to get rid of the imperfections and make them straight
and round. You can hone .005" out fairly easily. I generally don't even put them on a boring
machine unless I'm taking out .010 or more.

It's a PITA no matter how you slice it. I have Two boring machines (Quik-way FN and an FWS).
FWS for small cylinders and the FN for large bores.

I still hate boring cylinders but it's a necessary evil. People want a one-stop shop for machine
work, so I'm stuck doing them.   
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HD Street Performance

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Re: Scored cylinder wall
« Reply #22 on: April 14, 2019, 12:12:46 PM »

Happy to take any bore and hone job. Even the lower volume stuff. I have a CV616 Sunnen, their gauging, and a Kwikway bar. I make plates for any job I don't already have them for and have a good selection already. My base plate was set up to accommodate from small bore 883 all the way up to M8 big bores. I use drop in adapters to accomplish that.  Here is an example, M8 on my buddies CK10.
« Last Edit: April 14, 2019, 12:14:54 PM by HD Street Performance »
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MCE

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Re: Scored cylinder wall
« Reply #23 on: April 14, 2019, 02:23:10 PM »

Have all ya want. It's a mindless task, I only offer it as a service to my
cylinder head customers as a courtesy. I don't waste my time doing them
otherwise.
« Last Edit: April 16, 2019, 11:27:58 PM by MCE Performance »
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