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Modifications, A A 83 mm big bore kits made right
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Busted-bolt
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PostPosted: Tue Mar 16, 2021 6:30 pm    Post subject: Modifications, A A 83 mm big bore kits made right Reply with quote

The honing inside those aa cylinders is a cause of oil use. The fins toward the center outside of the cylinder also lifts the cylinder tin away from the cylinder head and the lower portion of the cylinder around .25" .I will be posting pictures of the before and after effect of the mods I will implement.
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Last edited by Busted-bolt on Fri Mar 19, 2021 1:31 pm; edited 1 time in total
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PostPosted: Fri Mar 19, 2021 8:02 am    Post subject: Re: Modifications, A A 53 mm big bore kits made right Reply with quote

Busted-bolt wrote:
The honing inside those aa cylinders is a cause of oil use. The fins toward the center outside of the cylinder also lifts the cylinder tin away from the cylinder head and the lower portion of the cylinder around .25" .I will be posting pictures of the before and after effect of the mods I will implement.

I was unaware that AA made 53mm P/C's? Are they also going to make the 1100cc / 25hp P/C's? Thanks.
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PostPosted: Fri Mar 19, 2021 10:47 am    Post subject: Re: Modifications, A A 53 mm big bore kits made right Reply with quote

Typo? I'm guessing 83mm P&C's?
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Busted-bolt
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PostPosted: Fri Mar 19, 2021 1:34 pm    Post subject: Re: Modifications, A A 83 mm big bore kits made right Reply with quote

Oops I ment 83 mm .I can do the mechanical side of things right because I'm at it all the time, texting /key board skills I'm a bit slow at because I just do not do it enough Embarassed
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Busted-bolt
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PostPosted: Tue Mar 23, 2021 5:39 pm    Post subject: Re: Modifications, A A 83 mm big bore kits made right Reply with quote

lage and deep swaths of original surface flattened out , the two first pictures is before the sizing hone the last is after. The deep areas where the crosshatch does not cross has been eliminated.
Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.
Cylinder tin fitment before and after the cylinder fin modification
Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.
modification done to cylinders before and after
Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

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TomSimon
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PostPosted: Mon Apr 12, 2021 8:01 am    Post subject: Re: Modifications, A A 83 mm big bore kits made right Reply with quote

I'm trying to follow what you're doing here; I understand the trimming the fins to better fit the tins, got that.

The hone: The first pictures show all one direction hone marks, not what you want to see in a cylinder at assembly time, got that.

I'm not sure about you, but almost everytime I trim a cylinder to length, grind fins, add stud hole clearance, the bores go a little out of round, as much as .0015". I wind up having them honed/trued afterward, but then they get larger in nominal diameter, ring end gap might suffer, it's a viscous circle, LOL.

The 'after pics' show better looking cross hatch pattern, but I suspect that isn't the entire story. Maybe you grabbed a berry-hone and touched it up so it looks better. Or maybe you used a precision cylindrical hone to true them up and give them a 'plateau' the profile, started with a honed surface that under a loupe looks like this: V then maybe you honed the tops off the 'teeth', ending up with something more like this: \_/ .

Can you give a few more details on what you did?
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Busted-bolt
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PostPosted: Mon Apr 12, 2021 5:09 pm    Post subject: Re: Modifications, A A 83 mm big bore kits made right Reply with quote

Yeah when I got the cylinders brand new they just did not have the stone pressures right ,and they kinda wiped at the cylinders. The hone that I use can be used to re size cylinders .It has a mechanical dial to place mechanical "rack and pinion "pressure on the stones. I have used it to bore tdi blocks .020" and I got it within .0005". That is about exactly what it took to clean them up. And no i did not use any form of spring or ball hone to clean any thing up,it was all done with the sizing hone with fine stones . When I was done the cylinders had zero run out from top to bottom and it is the same on the diameter from top,center and bottom. So yeah I kinda took the "tooth" out but kept them "square" in the process.I did not want to take too much off so you can kinda see some of the hone marks are at the greater angle still from original cross hatch.The measurement device used was a proper cylinder dial bore gauge ,the kind that has the Dial indicator gauge and a kinda "T" apparatus that protrudes from the bottom of the dial indicator. On one arm of the "T" there is a rather short stroke indicator pin cantered between a set of rollers . On the other arm of the "T" there is a removable "pin" to adjust the dial boar gauge to different cylinder diameters. This has been my "go to" tool to "square" cylinders up so to speak. Wink
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