Piston Domes

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11 Apr 2013 23:03 #581924 by 650ed
Piston Domes was created by 650ed
I've seen a number of pictures of different engines being rebuilt, and it brings a question to mind. The tops of new stock pistons are sometimes very rough, but sometimes I see pictures where the tops look to be very smooth or polished. Should piston domes be polished when rebuilding, or doesn't it really matter one way or the other? Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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11 Apr 2013 23:49 #581925 by wireman
Replied by wireman on topic Piston Domes
Id say the surface finish is directly related to amount of machine work done to pistons. :)
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12 Apr 2013 02:48 - 12 Apr 2013 02:55 #581934 by bountyhunter
Replied by bountyhunter on topic Piston Domes

650ed wrote: I've seen a number of pictures of different engines being rebuilt, and it brings a question to mind. The tops of new stock pistons are sometimes very rough, but sometimes I see pictures where the tops look to be very smooth or polished. Should piston domes be polished when rebuilding, or doesn't it really matter one way or the other? Ed

I polished the tops of my pistons when I did my rebuild using progressively finer sandpaper grits. The theory was that if it was smoother, heavy carbom would not be as likely to accumulate as much..... I should point out, the finest grit I used was about 180. I don't think mirror finishing is a good thing, I was just trying to level the major craters.
1979 KZ-750 Twin
Last edit: 12 Apr 2013 02:55 by bountyhunter.

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12 Apr 2013 02:49 #581935 by bountyhunter
Replied by bountyhunter on topic Piston Domes

wireman wrote: Id say the surface finish is directly related to amount of machine work done to pistons. :)

The tops appear to have no machining, they look like cast parts and only the critical sizing dimensions are machined. The rest are just cast rough finish.
1979 KZ-750 Twin

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12 Apr 2013 08:05 #581951 by Powerstroke_fan
Replied by Powerstroke_fan on topic Piston Domes
my mtcs had a smooth top.
1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
And Much Much more- SOLD

2014- ZX14R all stock for now

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12 Apr 2013 08:35 #581953 by turboking
Replied by turboking on topic Piston Domes
:ohmy: cast vs forged :woohoo: .......forged pistons have smooth machined tops and valve reliefs.....a cast piston usually has valve reliefs built in along with the front pointing installation arrow ...... :huh: all forged pistons like mtc's,JE's have a smooth finish machined top :dry:
:pinch: BTW.forged pistons are stronger than cast
2005 Kawasaki mean streak
2000 325 H.P. mcXpress turbo Hayabusa
1979 kz 1000 mk II ATP turbo
1975 Z1 960 cc Mr. Turbo
1975 Z1 1428 big block ATP turbo
1976 Kz900 1103 cc ATP turbo
1985 GS 1150E
1983 GS 1100E
1997 Suzuki Bandit 1200S
2001 Kawasaki EX 500 Ninja
1972 Honda cb750 (836cc turbo)
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12 Apr 2013 08:36 - 12 Apr 2013 08:42 #581954 by wireman
Replied by wireman on topic Piston Domes

Attachment piston.jpg not found

Borrowed this picture off APEs site,this is an aftermarket forged piston.
They get extra machine work done at factory to make the domes and valve notches just right,that and the forging process leaves a denser/smoother surface compared to a casting to start with. :)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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Last edit: 12 Apr 2013 08:42 by wireman.

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12 Apr 2013 08:53 #581955 by wireman
Replied by wireman on topic Piston Domes
www.google.com/url?sa=t&rct=j&q=piston%2...vm=bv.45175338,d.b2I :)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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12 Apr 2013 09:06 #581957 by 650ed
Replied by 650ed on topic Piston Domes
Cool video! Thanks!
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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14 Apr 2013 18:50 #582299 by dbsuperbiker
Replied by dbsuperbiker on topic Piston Domes
Ideally the piston top is coated with an insulating layer, either ceramic or hard carbon build up. This keeps the heat (heat is power) in the combustion chamber where it can push the piston down harder.
It's not about pretty...it's about HP.
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