Valve Adjustment help needed - Vielen dank!, She's running! Thanks for all the help! |
|
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. |
|
Valve Adjustment help needed - Vielen dank!, She's running! Thanks for all the help! |
stephenaki |
Oct 11 2009, 03:37 AM
Post
#1
|
Can I get this one dad?? Group: Members Posts: 1,183 Joined: 11-August 07 From: Palmetto, FL Member No.: 7,987 Region Association: None |
OK, so I have searched and can't find a thread related to my situation, maybe because people are smarter and more experienced than me. The question is pretty much spelled out in the topic description.
The crank, rods, piston and cylinders are 2.0, the heads are machined 1.7, what measurement do I use for the valve adjustment? 1.7 or 2.0? (IMG:style_emoticons/default/confused24.gif) I am leaning towards 1.7 but would like to get an educated opinion from the group. Help please, I want to re-do the valve adjustment before I mess with anything else. |
Cap'n Krusty |
Oct 11 2009, 10:23 AM
Post
#2
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Your 1.7 heads are unlikely to have sodium filled exhaust valves, so the setting is .006" all the way around. You'll need to reset them at 300 miles, then 1500, and every 3000 thereafter. BE SURE you calculate the deck height and combustion chamber volume accurately and adjust the cylinder base shims accordingly or you're gonna have WAAAAAAY too much compression. The Cap'n
|
stephenaki |
Oct 11 2009, 10:54 AM
Post
#3
|
Can I get this one dad?? Group: Members Posts: 1,183 Joined: 11-August 07 From: Palmetto, FL Member No.: 7,987 Region Association: None |
Your 1.7 heads are unlikely to have sodium filled exhaust valves, so the setting is .006" all the way around. You'll need to reset them at 300 miles, then 1500, and every 3000 thereafter. BE SURE you calculate the deck height and combustion chamber volume accurately and adjust the cylinder base shims accordingly or you're gonna have WAAAAAAY too much compression. The Cap'n Thanks, I'll adjust the valves then check compression and see where it is at. |
Cap'n Krusty |
Oct 12 2009, 12:06 PM
Post
#4
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Your 1.7 heads are unlikely to have sodium filled exhaust valves, so the setting is .006" all the way around. You'll need to reset them at 300 miles, then 1500, and every 3000 thereafter. BE SURE you calculate the deck height and combustion chamber volume accurately and adjust the cylinder base shims accordingly or you're gonna have WAAAAAAY too much compression. The Cap'n Thanks, I'll adjust the valves then check compression and see where it is at. NOT "the compression", the "compression RATIO". Has to be calculated before the heads go on. If you're using virgin 1.7 heads, it'll be too high. If you're using 1.7 heads that have been flycut, it'll be way too high. If you left out the head gaskets, as some here are inclined to do, it'll be WAAAAAAAAAAAY too high. As for looking for TDC by using the mark on the distributor, good luck. It's set by the mark on the fan, and if that wasn't done right, nothing will be right. You don't need to do that unless you're using the antiquated, tedious, effort intensive, and downright old fashioned and inaccurate Pelican Parts technique. Using my technique, easily found in the "classic threads" section of this website, I can have a whole valve adjustment job done while you're still looking for your first (of 4) TDC. The Cap'n |
stephenaki |
Oct 12 2009, 12:24 PM
Post
#5
|
Can I get this one dad?? Group: Members Posts: 1,183 Joined: 11-August 07 From: Palmetto, FL Member No.: 7,987 Region Association: None |
Your 1.7 heads are unlikely to have sodium filled exhaust valves, so the setting is .006" all the way around. You'll need to reset them at 300 miles, then 1500, and every 3000 thereafter. BE SURE you calculate the deck height and combustion chamber volume accurately and adjust the cylinder base shims accordingly or you're gonna have WAAAAAAY too much compression. The Cap'n Thanks, I'll adjust the valves then check compression and see where it is at. NOT "the compression", the "compression RATIO". Has to be calculated before the heads go on. If you're using virgin 1.7 heads, it'll be too high. If you're using 1.7 heads that have been flycut, it'll be way too high. If you left out the head gaskets, as some here are inclined to do, it'll be WAAAAAAAAAAAY too high. As for looking for TDC by using the mark on the distributor, good luck. It's set by the mark on the fan, and if that wasn't done right, nothing will be right. You don't need to do that unless you're using the antiquated, tedious, effort intensive, and downright old fashioned and inaccurate Pelican Parts technique. Using my technique, easily found in the "classic threads" section of this website, I can have a whole valve adjustment job done while you're still looking for your first (of 4) TDC. The Cap'n Cap'n Will look into your thread, as far as the heads, no, not virgin 1.7 heads, no I didn't leave out the head gaskets. The pistons are dished, how much of a difference will this make in the ratio? Learning all the time. |
Lo-Fi Version | Time is now: 25th September 2024 - 10:51 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |