ENGINE GURUs HELP Pls... Piston "Tolerance Group Code" ???
12-22-2004, 05:57 PM
#16
Originally Posted by Waterguy
Don't mistake book lernin' for real world experience.
12-22-2004, 06:00 PM
#17
Pro
Thread Starter
Join Date: Apr 2003
Location: Bethesda, MD
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Waterguy
Factory Service Manual, page 13-31, "Checking Pistons and Cylinder Bores." They have identical diameters, but Mahle has slightly tighter tolerances for the standard piston sizes. The diameter tolerance for first oversize (100.5 mm) pistons is +/- 0.007 mm from both Mahle and Kolbenschmidt, so I doubt that it is a big deal. 
Second, just a note that page (13-31) is for the NA motors, although the Turbo suplement shows the same numbers as 13-31 does for the Kolbenschmidt. What it doesn't seem to have (or at least I can't find) are the numbers you have for wear limits. Where were you able to find those specs?
12-22-2004, 06:07 PM
#18
Pro
Thread Starter
Join Date: Apr 2003
Location: Bethesda, MD
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by APKhaos
... his rebuild is runnign a few weeks ahead of mine. With some luck, I'll learn from his experience and the wisdom of the board.
12-22-2004, 06:35 PM
#19
Three Wheelin'
Dar951: You really need to get a less common first name in order to keep me from making such embarassing mistakes. 
The piston clearance wear limit is on Page 10-02 of the turbo supplement and 10-02a of Volume 1 ("Tolerances and Wear Limits".) Same values for NA and turbo, although it is presented in a more friendly format in volume 1.
The cylinder bore out-of-round wear limit is on page 10-03 of the Turbo supplement and 10-02a of Volume 1 (again, same value for turbos and NA.) Those are the only wear limits i could find that applied to pistons and bores.
It is nice to see you guys doing rebuilds instead of just swapping in used engines. I congratulate you.
The piston clearance wear limit is on Page 10-02 of the turbo supplement and 10-02a of Volume 1 ("Tolerances and Wear Limits".) Same values for NA and turbo, although it is presented in a more friendly format in volume 1.
The cylinder bore out-of-round wear limit is on page 10-03 of the Turbo supplement and 10-02a of Volume 1 (again, same value for turbos and NA.) Those are the only wear limits i could find that applied to pistons and bores.
It is nice to see you guys doing rebuilds instead of just swapping in used engines. I congratulate you.
12-22-2004, 07:15 PM
#20
Originally Posted by Waterguy
It is nice to see you guys doing rebuilds instead of just swapping in used engines. I congratulate you.
FWIW, just spoke to Dave at Lindsey Racing who was exceptionally helpful. My head is on its way to Lindsay as soon as the engine is dropped. Dave has a nice array of temptations that make it really hard for us stock class racers to say NO! Its a character test just talking to Dave
12-22-2004, 07:58 PM
#21
Pro
Thread Starter
Join Date: Apr 2003
Location: Bethesda, MD
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Waterguy
Dar951: You really need to get a less common first name in order to keep me from making such embarassing mistakes.
Thanks a ton for doing my homework for me and posting the references... Very much appreciated.
