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E: Engine Cylinder liners

Cyborg

Well Known and Active Website User
VOC Member
Unsure about the history of these cylinders, but they are still standard bore and would be within limits if I used NOS pistons. Plan is to bore them .020” over and use modern low expansion versions. One of the reasons the liners were removed was because the oil feed holes were too high. In fact everyone I have measured it too high. Unsure at this point if I will use the feed holes at all, but will reinstall the liners 180 degrees, so new holes can be drilled at the proper height and then oil supply can be shut off or not. I’m assuming these are factory liners, but haven’t seen ones removed in this condition (printing still visible). The carbon buildup didn’t amount to much and cleaned up with some aircraft paint stripper, so no abrasive required. Contact between muff and liner looks better than usual….Finnish on the muff bore looks a little strange, almost like there was some vibration on the cutting tool? Then honed to size? Anyway… look good enough to use. It took a fair amount of heat to get them to drop, so that was a good sign. Comments…suggestions…liner looks original?


0E4FAA95-7B75-4FF7-88CA-0953195C25A3.jpegE825A919-2100-483E-9C43-09B767DC3689.jpegC0BCA440-76DA-450C-A102-FC323AF22219.jpeg
 

Jim Bush

Well Known and Active Website User
VOC Member
Jim, Did you use anything for lube when cutting ?,
I had a Trained friend who did a Super job on my pistons,
Opening up the ring lands, To take bigger rings,
He used WD 40.
Cheers Bill.
No lube this time, cuts were miniscule - I used a fresh carbide insert with positive rake that seemed to do a fine clean cut and leave a very flat finish. I often use SD40 on aluminum machining, preference is a spray mister.
 

flashvin

Website User
VOC Member
Expensive but Millenium Engineering will do up your old cyl. muffs with and alloy liner and Nikasil coat them.
Using modern forged piston specify .035 skirt clearence and supply them with the piston to be used. Skip the oil hole archaic no need. Shorten the bottom of the overly long liner by 35mm to allow better splash misting oil to reach the underside of the pistons assuming your going to fit the modern spec shorter skirt piston. Never had a seizure racing running 11.5 /1 forged pistons and above specs. And those pistons got hot. Blued wrist pins . Which tightened up in the small end eye till I increase the pin to small end eye clearance by + .005 . Then all was well. Happy motoring
 

Nigel Spaxman

Well Known and Active Website User
VOC Member
Expensive but Millenium Engineering will do up your old cyl. muffs with and alloy liner and Nikasil coat them.
Using modern forged piston specify .035 skirt clearence and supply them with the piston to be used. Skip the oil hole archaic no need. Shorten the bottom of the overly long liner by 35mm to allow better splash misting oil to reach the underside of the pistons assuming your going to fit the modern spec shorter skirt piston. Never had a seizure racing running 11.5 /1 forged pistons and above specs. And those pistons got hot. Blued wrist pins . Which tightened up in the small end eye till I increase the pin to small end eye clearance by + .005 . Then all was well. Happy motoring
That is a good idea shortening the liner. There is no reason for the liner to go down lower than the piston goes. I think you must have meant .0005"
 

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