Alfa Romeo Bulletin Board & Forums - Reply to Topic
Thread: The Giulia 101 Veloce pistons (and other parts) trivia Reply to Thread
Title:
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
06-12-2019 02:26 PM
Raimondo Would electrolysis remove that rust and make the piston usable?

Ray
06-12-2019 01:46 PM
squirrelman1 here's a 9.7 piston that rusted in place, sad story, '63 spider #374624

Attachment 1571424
06-01-2019 03:40 PM
VabeneGTV 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.
05-31-2019 01:24 PM
VabeneGTV How about this?
02-16-2018 09:27 PM
velocedoc 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.
02-15-2018 11:05 PM
fgsavoia
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.




Sent from my iPhone using Tapatalk
02-06-2018 12:15 PM
fgsavoia
Quote:
Originally Posted by carl750 View Post
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.
02-06-2018 10:47 AM
carl750 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!
02-06-2018 09:35 AM
fgsavoia
Quote:
Originally Posted by velocedoc View Post
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


Sent from my iPhone using Tapatalk
02-06-2018 08:09 AM
carl750
1600 Veloce piston pictures

attached
02-05-2018 06:11 PM
velocedoc 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.
02-04-2018 10:00 PM
fgsavoia
Quote:
Originally Posted by velocedoc View Post
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...


Sent from my iPhone using Tapatalk
02-04-2018 09:33 PM
velocedoc 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.
02-04-2018 08:39 AM
fgsavoia
Quote:
Originally Posted by velocedoc View Post
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
02-04-2018 08:20 AM
velocedoc 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.
This thread has more than 15 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome