Have anyone done it ?
I try to search writings about it from forum source but none found
my idea is to use 90mm KS alusil cylinder, to overbore to 92mm and sent to replating them with nicasil (or similar)
Any experiences and comments based on that there, good, bad not dooable at all?
also how thick (to undersize the bore) spray have been done, ,25 or ,50mm or less
Would like to hear if experiences exsist as replating cost and if thy come as crap out not funny for wallet
thanks in advance
pekka
911 S -72 Targa
911 S/T -70 Gulf- replica
930 -88 Coupe no sunroof, mint
911 S -75 Targa /cabriolet
911 T -71 Targa project
911 T -70 Targa project
928 S4 with XX8 option -91
"Super" -59 Schlepper
+some water cooled 924&928&944&968&958&997series
Sold and gone only to remember
911 2.9 RC -70, 911 3.2 cab -89, 911 T -70, 928 S4 -90, 944 -84, 911 T-71, 356 B -60, 911 -65, 986 3,2S -01, 955 3,2 -04, 957tbo -08
Early S Registry # 3253
PCF # 710
These guys may be of help with coatings. cliff
To err is human; to blame it on someone else is more human...
"You must always strive to be the best, but you must never believe that you are."
—Juan Manuel Fangio[48]
”What would PORSCHE do”
67 911 de Luxe, 356 B silver metallic / brown interior, ( buck skin really ) 67 PORSCHE [ built ] 912, Crystal blue, black interior, 72 T, Silver metallic/black interior, appearance group,factory AC.
It is a standard practice on the 95 mm cylinders to overbore and re-plate in Nikasil to 98 mm. The 2.7 should be no different.
I have used Millenium Technologies for this.
https://www.millennium-tech.net/
Tom Butler
1973 RSR Clone
1970 911E
914-6 GT Clone in Progress
Thanks for the reply
just to understand right so you do also that for kolbenschidd alusil cyls?
Mahles I know they work nice for replating but they are diffrent combination of metal the liner part
sorry to replicate my question, but better to ask than thought
911 S -72 Targa
911 S/T -70 Gulf- replica
930 -88 Coupe no sunroof, mint
911 S -75 Targa /cabriolet
911 T -71 Targa project
911 T -70 Targa project
928 S4 with XX8 option -91
"Super" -59 Schlepper
+some water cooled 924&928&944&968&958&997series
Sold and gone only to remember
911 2.9 RC -70, 911 3.2 cab -89, 911 T -70, 928 S4 -90, 944 -84, 911 T-71, 356 B -60, 911 -65, 986 3,2S -01, 955 3,2 -04, 957tbo -08
Early S Registry # 3253
PCF # 710
Yes. Common practice is to take 95 mm KS Alusil cylinders and bore and re-plate them to 98 mm Nikasil.
Tom Butler
1973 RSR Clone
1970 911E
914-6 GT Clone in Progress
Early S Registry #235
rgruppe #111
Thanks for the forum,
Ikeep posted how they come when I got them back, so standart steel piston rings, not any cromal or otherwise treated
I´ll send cyls&pistons to France, to Revaltech they have done me one se for my turbo(mahles) and the outcome and details were exelent
911 S -72 Targa
911 S/T -70 Gulf- replica
930 -88 Coupe no sunroof, mint
911 S -75 Targa /cabriolet
911 T -71 Targa project
911 T -70 Targa project
928 S4 with XX8 option -91
"Super" -59 Schlepper
+some water cooled 924&928&944&968&958&997series
Sold and gone only to remember
911 2.9 RC -70, 911 3.2 cab -89, 911 T -70, 928 S4 -90, 944 -84, 911 T-71, 356 B -60, 911 -65, 986 3,2S -01, 955 3,2 -04, 957tbo -08
Early S Registry # 3253
PCF # 710
I worked with a local local high performance engine building machine shop a number of years ago and what we came up with, was doing, was acid etching the surface of the alusil cyl, this allowed the silcone bits to float to the surface. We tried this because he used to do a lot of work on the old Vega engines that were almost identical to Porsche cylinders. They were an aluminum blocks where the pistons ran without liners. Did quite a few engines like that and don't remember any of them coming back ( those things , you don't forget ) He is still doing that today and has done a lot of cyl this way without any issues with ring seating / oil consumption
Don't know if this helps
Thanks, Rick
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