The Giulia 101 Veloce pistons (and other parts) trivia - Alfa Romeo Bulletin Board & Forums
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post #1 of 16 (permalink) Old 02-04-2018, 07:21 AM Thread Starter
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The Giulia 101 Veloce pistons (and other parts) trivia

I've just started the restoration of a 1965 Giulia Spider Veloce (former owner should have been mr. D'Amico in Vineland, NJ)

The pistons are still there but I don't know:
  • If they are the original ones
  • If they could be recovered

I've talked with several Alfa guys, some say that the 121 engine pistons are different from the normal 1600 unit, others say they aren't but nobody can tell me exactly why. Is anyone here aware of such differences?

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Queston #2: is the actual distributor the correct one?

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Question #3: how high is the stock head of a type 121 engine?


Thank you in advance.

Francesco
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post #2 of 16 (permalink) Old 02-04-2018, 08:20 AM
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To answer quickly some of your questions. The pistons are forged and not cast with a 9.7 to 1 compression ratio. The distributor is correct. The stock head height should be about 112 centimeters. Check the head fro cracks around the exhaust valve seats. It can be repaired successfully.
I would like to know more about the car for the 101 Veloce register. Send me a PM please. Thank you.

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post #3 of 16 (permalink) Old 02-04-2018, 08:39 AM Thread Starter
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To answer quickly some of your questions. The pistons are forged and not cast with a 9.7 to 1 compression ratio. The distributor is correct. The stock head height should be about 112 centimeters. Check the head fro cracks around the exhaust valve seats. It can be repaired successfully.
I would like to know more about the car for the 101 Veloce register. Send me a PM please. Thank you.
Hello Christopher, that's me, Francesco. You know the car

Francesco
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post #4 of 16 (permalink) Old 02-04-2018, 09:33 PM
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Grazie Francesco.
Check the top and 2nd ring gaps. No more than .003 thousandth clearance. Extra thick compression rings can be found.
There may be other opinions.
I would be more concerned about the condition of the liners.

Christopher

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post #5 of 16 (permalink) Old 02-04-2018, 10:00 PM Thread Starter
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Grazie Francesco.
Check the top and 2nd ring gaps. No more than .003 thousandth clearance. Extra thick compression rings can be found.
There may be other opinions.
I would be more concerned about the condition of the liners.


Hi Christopher,
Liners are not a problem simply because are not there...I must buy them. Iíll must do some math as head is lower than 112 mm and Iíve seen thatís there are no 9.7:1 pistons for sale. Spruell has 9.5...


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post #6 of 16 (permalink) Old 02-05-2018, 06:11 PM
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I probably will dig my self a big hole here with some of my comments. Since you do not have any liners, call APE and ask Larry to sell you a set of liners. I am sure he has a nice stash of 1600 liners. You will need to have them honed for the rings you are going to use. The difference between 9.5 and 9.7 I would imagine is not that big of a deal in the final results of the horsepower derived. How are your cams looking? they should say 10121 on the markings. Check to see if there is a S or D on the cam to tell you where it goes on the exhaust or intake. It has been so long I might forgot that they can go either side.

Christopher

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post #7 of 16 (permalink) Old 02-06-2018, 08:09 AM
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1600 Veloce piston pictures

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post #8 of 16 (permalink) Old 02-06-2018, 09:35 AM Thread Starter
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I probably will dig my self a big hole here with some of my comments. Since you do not have any liners, call APE and ask Larry to sell you a set of liners. I am sure he has a nice stash of 1600 liners. You will need to have them honed for the rings you are going to use. The difference between 9.5 and 9.7 I would imagine is not that big of a deal in the final results of the horsepower derived. How are your cams looking? they should say 10121 on the markings. Check to see if there is a S or D on the cam to tell you where it goes on the exhaust or intake. It has been so long I might forgot that they can go either side.


Hi Christopher, Iíll check for the liners but, first of all, Iíll verify if the pistons can be recovered. These are the cams:


@carl750 thank you very much for the photos, very useful


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post #9 of 16 (permalink) Old 02-06-2018, 10:47 AM
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Especially if you use the Veloce pistons, be very careful of prior head cuts that have made the valves to close to the piston. Also no extended reach spark plugs! If the head is warped ......... have it straightened ......... not cut!
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post #10 of 16 (permalink) Old 02-06-2018, 12:15 PM Thread Starter
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Especially if you use the Veloce pistons, be very careful of prior head cuts that have made the valves to close to the piston. Also no extended reach spark plugs! If the head is warped ......... have it straightened ......... not cut!
Thanks Carl. Actually the head is lower than stock, however I'll order a custom head gasket from Sangalli tall enough to compensate the lack of material.

Francesco
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post #11 of 16 (permalink) Old 02-15-2018, 11:05 PM Thread Starter
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The Giulia 101 Veloce pistons (and other parts) trivia

Ok these are the pistons, they look original, donít they?
Unfortunately a couple are scratched so Iíve been told that the best thing to do, for a job like this, is to replace them.
Not easy at all to find that dome shape.




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post #12 of 16 (permalink) Old 02-16-2018, 09:27 PM
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Yes, those would cause hot spots.
You can have custom pistons made and I am sure there are folks on here that could give you some recommendations. Thank you for posting the photos. How is much ring land gap there with the rings installed? You should not have more than.003 That is the outside limit. Any more than that, you get ring float and then the ring will break. That is what happened shortly after I go my Veloce.
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post #13 of 16 (permalink) Old 05-31-2019, 01:24 PM
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How about this?
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Cars ruined my life! 😱
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post #14 of 16 (permalink) Old 06-01-2019, 03:40 PM
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I think this piston may be a standard GTA piston as evidenced by the arrow on the crown, and supported by the attached image from the Competition Advisory Manual, specifically the note stating that the arrow must face front toward the engine. With that said these should be forged 9.7 pistons, and could be used as a more or less proper substitution for the scarce proper velocity piston.
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post #15 of 16 (permalink) Old 06-12-2019, 01:46 PM
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here's a 9.7 piston that rusted in place, sad story, '63 spider #374624

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ones that got away: '57 Giulietta Spider, '67 TI Super, '74 GTV, '64 Giulia Spider, '72 GT Junior.
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