 Deck height measurements driving me crazy, Need advice |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| stugray |
 Oct 14 2012, 02:06 PM
Post
#1
|
|
Advanced Member  Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None  |
Ok, so I bought the deck height measurement tools from the group buy.
But I cannot figure out exactly how the OP intended to use the middle plate. I have been trying to measure my deck height accurately for weeks now and I either am not doing it right, or I have a problem. I have the EMW AA cylinders & KB Hypereutectic pistons - brand new. I am measuring with no shims under the cyls. I bolt the holddown tool on two cyls with pistons installed and torque to spec (24 ft-lbs) I set TDC on the cyl I am about to measure with a mag base & dial indicator using the middle of the piston as reference. I then set a VERY straight edge across both cylinders and clamp it down. I then measure the top of the cylinder mating surface down to the very edge of the piston using a dial indicator/depth gauge. I repeat the measurement at least 5 times and average the results. I am getting measurements that vary from .022 to .032 and they can vary by up to .0067 across a single piston (front to rear). (IMG:style_emoticons/default/WTF.gif) (measurements at the same spot are repeateable within less than .001) When we are trying to get these deck heights to match to within a few thousandths, I cannot see how that can be done when the piston can be off by more than 5 thousandths front to rear. Does this mean I have bent rods or misaligned wrist pin bushings? I had the entire rotating assembly balanced, so I would hope they would have caught something bent. I guess my next steps will be to shuffle the pistons around and see if the measurements follow the pistons. If they dont, I might need to move rods. Can all 4 rods be removed & replaced without splitting the case again? Stu |
   |
 
|
  |
Replies(60 - 65)
| Harpo |
Nov 8 2012, 04:33 PM
Post
#61
|
|
Senior Member Group: Members Posts: 1,304 Joined: 21-August 11 From: Motor City aka Detroit Member No.: 13,469 Region Association: None |
QUOTE(stugray @ Nov 8 2012, 10:58 AM)  Thanks - he said that he would machine all four registers down to the worst case register, #4 is minus 8 thousandths. However the opposite side seems to be perfect & flat. If the #1 & 2 side is perfect, is there any reason to machine it down to match #4? Also - Where can I get replacement head studs? I cant seem to find any online without buying a full set of ARP studs. Stu EMS has stroker head studs, they may also have studs in std length DAvid |
|
|
|
| stugray |
Nov 8 2012, 06:28 PM
Post
#62
|
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
David - Sorry, but what is "EMS"?
I know of EMW (European Motor Works). A quick google search didnt find it. Stu |
|
|
|
| Dr Evil |
Nov 8 2012, 06:41 PM
Post
#63
|
|
Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
|
EBS, not EMS. Engine Builder's Supply in Sparks NV.
|
|
|
|
| EdwardBlume |
Dec 25 2012, 06:59 AM
Post
#64
|
|
914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California
|
Any news or update?
|
|
|
|
| Randal |
Dec 25 2012, 10:31 AM
Post
#65
|
|
Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
QUOTE(Vacca Rabite @ Oct 17 2012, 04:42 AM) Please put up some pictures of what you are doing. Zach Or better yet a video! |
|
|
|
| stugray |
Dec 25 2012, 01:35 PM
Post
#66
|
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I had the cases decked and did another measurement. They are all close enough to proceed. Next I checked my valve train geometry for valve clearance and now I am sending the heads for some machining to do a valve job & set the CR. After that I will recheck everything when I put it back together. I will try to get some video of the process. I have another thread about figuring out my rocker ratios.
http://www.914world.com/bbs2/index.php?showtopic=200247 Stu |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 3rd June 2024 - 12:30 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.