Who can bore/hone my cyl liners? - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 27 (permalink) Old 01-31-2018, 10:42 PM
Duk
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Quote:
Originally Posted by Alfar7 View Post
They are weak enough stock. Boring them will increase weakness, Turning the outside will be asking for failure.
How weak are they?

New idea, again before I go to work:

1: Machine the outside of the sleeve for a consistent finish.
2: Machine an interferance sleeve from a high strength steel, like 4140 and fit to the outside of the Alfa sleeve.
3: Create afore mentioned sleeve boring jig.
4: Bore and hone these impressively strong, mutant Alfa sleeves to amazing tolerances.
5: Profit.

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post #17 of 27 (permalink) Old 02-01-2018, 07:57 AM
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can do them for you. my shop has fixtures for all the alfa liners. 4cyl & V6. if yours are not too far gone, tolerances will be on the money (i.e. in spec)... or money back.
andy
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post #18 of 27 (permalink) Old 02-01-2018, 08:38 AM
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Quote:
How weak are they?
I have seen a few cracked liners in racing engines so there is not a lot of safety margin.

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post #19 of 27 (permalink) Old 02-01-2018, 08:47 AM
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eventually gonna see a cracked everything in racing engines
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post #20 of 27 (permalink) Old 02-01-2018, 10:00 AM
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You can buy steel liners... The discussed weakness in Alfa liners is my own reason for not honing 1600 liners to 80 mm for 1600 blocks used in racing. I only go to 79, as once-- just once, we had a thin skirt crack off an 80 mm bore liner 1600 in racing. Very little was salvageable from the remains. The iron alloy used in older Alfa liners was generally sound, but as noted, iron wet liners are not as tough as racers want. Today you can have new "spun-cast" liners made up, of sometimes special alloys that are possibly better. Some new liners offered for rebuilds are pretty horrid, as noted in this thread. You BETTER measure them! Hidden flaws? They are there. Generally liners that fail, are new, unmodified, and they fail in different ways. If I use Alfa liners, old ones with lots of heat soak cycles are best, "use-stress-relieved". However, these usually need to be honed oversize, and you don't want to go too big!
From my own experience with disaster.
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post #21 of 27 (permalink) Old 02-01-2018, 12:21 PM
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I had a pair of Ducati 748 cylinders bored to accommodate an 853 kit. They were done by Millennium Technolgies, who also nikosil plated the bores, they are quite familiar with the boring process. I don't know if the plating would need to be done on the Alfa liners, just my 2 cents.
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post #22 of 27 (permalink) Old 02-02-2018, 05:43 PM
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I was talking with Robert Rogers about this a couple of months ago. He has dedicated blocks with torque plates for his boring. He may finish with a hone. He knows his stuff. My turn for a question... Are the Darton liners steel and or what makes them so special $$$$ ?

The passenger seat is 15 miles an hour faster than the drivers seat.

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the ones that got away:
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post #23 of 27 (permalink) Old 02-08-2018, 09:19 AM
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failed liner

I pulled this 85 mm liner from my 2L motor today. It has done about 8,000 miles. It is not a race motor but it makes 170+ HP and it is frequently revved to 7000 rpm. It is being rebuilt because an overheating event weakened the compression rings. Fortunately I have a spare liner that was bored at the same time as the ones that were in the motor.
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85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #24 of 27 (permalink) Old 02-08-2018, 09:28 AM
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Is that related to the overheating event or something else, ie, what caused it? Not getting it out I hope. What is that rectangular mark to the right of the diviot?

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #25 of 27 (permalink) Old 02-08-2018, 10:23 AM
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It slid out easily. No idea why that piece broke off. It may still be usable so I am not going to throw it away. RJ says that liners may be ground away in that area to clear Carrillo H beam rods.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #26 of 27 (permalink) Old 02-08-2018, 11:52 AM
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Sounds like a plan. Glad it's ok.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #27 of 27 (permalink) Old 02-08-2018, 04:48 PM
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Quote:
Originally Posted by barboncino105 View Post
eventually gonna see a cracked everything in racing engines
Where is your shop?
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