Decided to rig up a degree wheel, ARGH!! Valve Train Geometry |
|
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. |
|
Decided to rig up a degree wheel, ARGH!! Valve Train Geometry |
DNHunt |
Sep 3 2004, 09:22 PM
Post
#1
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
I decided to rig up a degree wheel to use in setting up the valve train. It's just a paper 360 degree disk stuck on my trigger wheel with a pointer off 1 of the studs for the cooling shroud. It should be interesting to see where valves open and close.
Dave Attached image(s) |
DNHunt |
Sep 3 2004, 09:26 PM
Post
#2
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
I think it will make it a little easier to replicate TDC. I expect to be repeating this stuff a bunch
Attached image(s) |
d7n7master |
Sep 3 2004, 10:09 PM
Post
#3
|
Gary# Group: Members Posts: 663 Joined: 13-March 03 From: The O.C, Ca. Member No.: 421 |
SOB!!! I want your engine stand!!! OH,,,,,,,,,,& the results of your v/t setup. That's actually the ONLY thing I miss about my bugs. Man, 7 1/2 degrees - static - done. That was then.
Everytime I kick my '73 2.0 to 3.5k to check/set the timing I think about how simple life once ways. Too many timing marks - so little time (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) |
Mueller |
Sep 4 2004, 01:22 AM
Post
#4
|
914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
look'n good Dave (IMG:style_emoticons/default/pray.gif)
nice degree wheel, I just printed out a few for this weekend (IMG:style_emoticons/default/smash.gif) |
Tom Perso |
Sep 4 2004, 05:35 AM
Post
#5
|
Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
Have fun with that!!!
Do you have the v/t springs setup in your heads? Those double-throw down dual springs will bend an adjustable pushrod in a blink of an eye. Tom |
DNHunt |
Sep 4 2004, 06:59 AM
Post
#6
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Tom
Mine are some single springs. I have some springs from the hardware store I can use if need be. Dave |
Tom Perso |
Sep 4 2004, 07:44 AM
Post
#7
|
Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
You are all set!!!
Good luck... What type of pushrods are you using? Tom |
DNHunt |
Sep 4 2004, 08:32 AM
Post
#8
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Chromoly
|
DNHunt |
Sep 4 2004, 08:34 AM
Post
#9
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Here's a picture of the trial springs on the valve stems
Attached image(s) |
DNHunt |
Sep 4 2004, 08:37 AM
Post
#10
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
I made a little stand for the dial indicator that rests on the valve cover sealing surface
Attached image(s) |
DNHunt |
Sep 4 2004, 08:40 AM
Post
#11
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
I've got a rectangular frame that clamps the indicator stand down. It uses threaded rod and clips into the holes that hold the valve cover bales.
As soon as the kid wakes up we'll install the rocker studs and start checking stuff. I might have a little wait, he had his first high school dance last night. Attached image(s) |
DNHunt |
Sep 4 2004, 09:32 PM
Post
#12
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Well, we managed to get 1 cylinder done. Dad had a little problem with a rotor on backwards, which I thought was the cam drive off 180 degrees or the dizzy drive. The kid said check the rotor. Don't ask how come I took a couple of hours to figure it out.
Here we are already to start on #1 exhaust Attached image(s) |
DNHunt |
Sep 4 2004, 09:39 PM
Post
#13
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
The idea is to get the adjuster parallel to the valve stem at half opening. The intake ended up at .514 and the exhaust ended up at .487.
Here is the intake Attached image(s) |
DNHunt |
Sep 4 2004, 09:46 PM
Post
#14
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
A lot of trial and error. Here as good a shot as I could get of what I think it's supposed to look like at half open.
I need a beer (IMG:style_emoticons/default/givemebeer.gif) Dave Attached image(s) |
swood |
Sep 6 2004, 01:07 PM
Post
#15
|
Senior Member Group: Members Posts: 1,839 Joined: 6-February 03 From: Strong Beach Member No.: 251 Region Association: None |
Dave, how's the vtg going? What adjusters are you using, looks like a pointy tip or something.
Steve |
Jake Raby |
Sep 6 2004, 03:27 PM
Post
#16
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Dave, looking good! I like your tool for the geometry!
I sent you an email |
DNHunt |
Sep 6 2004, 03:28 PM
Post
#17
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
The adjusters are swivel feet. The one in the picture is an old pointy thing I ground so I could see better. Here's a better picture of the adjusters. Note they are not on center engine front to engine back. A couple are about 3/4 of a mm one way or the other.
Reading the cam at the valve just drove me crazy. I had to keep asking myself how many times did that go around. It turns out the cam has more lift on the intake than the exhaust but a longer duration on the exhaust. The intake ramps up faster so the duration at .050" is almost the same. The rocker shims are thicker on the 1, 2 side than the 3, 4 side. I think I have it right. Dave Attached image(s) |
Jake Raby |
Sep 6 2004, 03:30 PM
Post
#18
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Looks great Dave... Thats what its suppose to look like. Isn't it funny how close my guess was on the pushrod length.
I have used that cam atleast 200 times (IMG:style_emoticons/default/boldblue.gif) |
DNHunt |
Sep 6 2004, 03:32 PM
Post
#19
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Here's Gerry torqueing down the rockers to check the crossover point on #4.
Attached image(s) |
Lo-Fi Version | Time is now: 5th December 2024 - 10:03 AM |
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 ... |