Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

3 Pages V < 1 2 3 >  
 Reply to this topicStart new topic
> over-pressurized case
Joe Ricard
post Jul 14 2005, 10:34 AM
Post #21


CUMONIWANNARACEU
*****

Group: Members
Posts: 6,811
Joined: 5-January 03
From: Gautier, MS
Member No.: 92
QUOTE (Mueller @ Jul 14 2005, 08:01 AM)
better get out your tool box, a few more weeks and you'll be installing a new engine (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)

He's got to come get it 1st. Won't be long now ..... In this order. High oil level results in high oil pressure which leads to blowing out seals at crank or cooler. Maybe even the case plugs behind the flywheel. All of a sudden the green light goes on as a result of no oil pressure. Hence you now need my motor REAL BAD.

Nobody but me puts a wrench on my car. Some people I don't even open the engine lid to look inside.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Allan
post Jul 14 2005, 10:36 AM
Post #22


Teenerless Weenie
*****

Group: Members
Posts: 8,373
Joined: 5-July 04
From: Western Mesopotamia
Member No.: 2,304
Region Association: Southern California
Does this have anything to do with "How do I change oil cooler seals"?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 10:37 AM
Post #23


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
QUOTE (mudfoot76 @ Jul 14 2005, 10:34 AM)
QUOTE (bd1308 @ Jul 14 2005, 11:31 AM)
less than half inch

Do you have a working oil pressure gauge?

How are you measuring case pressure?

I routinely run with oil level about 1/2 qt high, esp for HPDE events. High speed corners a'plenty at Putnam Park. I've not had a starvation issue, nor an overpressure issue on the new engine...

i'm not measuring....it's pretty obvious. Joe the guy with the truck i will talk to today.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jul 14 2005, 10:37 AM
Post #24


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
FYI,

real race engines will have vac. pumps installed to minimize the crankcase pressure, some work so well that you could have a 1" hole in the side of the case and not lose oil while the motor was running....

bottom line, do you have a vent hose to atmosphere for the crankcase?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 10:38 AM
Post #25


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
QUOTE (Headrage @ Jul 14 2005, 10:36 AM)
Does this have anything to do with "How do I change oil cooler seals"?

nope...wasnt it. twas the pressure switch.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Jul 14 2005, 10:43 AM
Post #26


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
QUOTE (Joe Ricard @ Jul 14 2005, 09:34 AM)
QUOTE (Mueller @ Jul 14 2005, 08:01 AM)
better get out your tool box, a few more weeks and you'll be installing a new engine  :wacko:

He's got to come get it 1st. Won't be long now ..... In this order. High oil level results in high oil pressure which leads to blowing out seals at crank or cooler. Maybe even the case plugs behind the flywheel. All of a sudden the green light goes on as a result of no oil pressure. Hence you now need my motor REAL BAD.

Nobody but me puts a wrench on my car. Some people I don't even open the engine lid to look inside.

I beg to differ. Oil level is unrelated to oil pressure. Oil pressure is regulated by the spring and piston arrangement in the case. The crankcase is simply a reservoir to pump oil from. It can be as high as you like as long as it doesn't hit moving parts. Once it does it becomes a low oil pressure problem. Crankcase pressure is regulated by blowby and venting. I think it's time for a leakdown test. Oil level is clearly not the problem here.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 10:44 AM
Post #27


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
QUOTE (Mueller @ Jul 14 2005, 10:37 AM)
FYI,

real race engines will have vac. pumps installed to minimize the crankcase pressure, some work so well that you could have a 1" hole in the side of the case and not lose oil while the motor was running....

bottom line, do you have a vent hose to atmosphere for the crankcase?

right now i made a hose system to vent both heads and the PCV to the fitting to the carb with a T fitting. seemed to work fine when the pressure switch was pouring oil all over the place....


but now taht i have the switch fixed other problems are creeping up. ran liek a charm until i stopped to get oil.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 10:45 AM
Post #28


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
i really hate venting to atmosphere.....

motor honey wont fix the prob for now....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jul 14 2005, 10:53 AM
Post #29


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
QUOTE (bd1308 @ Jul 14 2005, 09:45 AM)
i really hate venting to atmosphere.....

motor honey wont fix the prob for now....

is the air from the crankcase going into the intake before or after the carb??
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 11:02 AM
Post #30


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
QUOTE (Mueller @ Jul 14 2005, 10:53 AM)
QUOTE (bd1308 @ Jul 14 2005, 09:45 AM)
i really hate venting to atmosphere.....

motor honey wont fix the prob for now....

is the air from the crankcase going into the intake before or after the carb??

before..... i dont know how to make it after.....but i figure there is more vac that way
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gklinger
post Jul 14 2005, 11:17 AM
Post #31


doh!
**

Group: Members
Posts: 316
Joined: 14-January 03
From: Tempe, AZ
Member No.: 146
Region Association: Southwest Region
IIRC the head vents are *intake* for fresh air into the crankcase, not *exhaust*. The PCV valve is the crankcase exhaust. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Joe Ricard
post Jul 14 2005, 11:25 AM
Post #32


CUMONIWANNARACEU
*****

Group: Members
Posts: 6,811
Joined: 5-January 03
From: Gautier, MS
Member No.: 92
QUOTE (bondo @ Jul 14 2005, 08:43 AM)
QUOTE (Joe Ricard @ Jul 14 2005, 09:34 AM)
QUOTE (Mueller @ Jul 14 2005, 08:01 AM)
better get out your tool box, a few more weeks and you'll be installing a new engine  :wacko:

He's got to come get it 1st. Won't be long now ..... In this order. High oil level results in high oil pressure which leads to blowing out seals at crank or cooler. Maybe even the case plugs behind the flywheel. All of a sudden the green light goes on as a result of no oil pressure. Hence you now need my motor REAL BAD.

Nobody but me puts a wrench on my car. Some people I don't even open the engine lid to look inside.

I beg to differ. Oil level is unrelated to oil pressure. Oil pressure is regulated by the spring and piston arrangement in the case. The crankcase is simply a reservoir to pump oil from. It can be as high as you like as long as it doesn't hit moving parts. Once it does it becomes a low oil pressure problem. Crankcase pressure is regulated by blowby and venting. I think it's time for a leakdown test. Oil level is clearly not the problem here.

Sorry I don't know what I was thinking. Maybe I don't know shit about effects of high oil level because I never experienced it. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)

Yea yea that's it. (IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rouser
post Jul 14 2005, 04:09 PM
Post #33


Anti-Post Whore
***

Group: Benefactors
Posts: 597
Joined: 30-December 02
From: Citrus Park, Florida
Member No.: 54
QUOTE (bd1308 @ Jul 14 2005, 12:44 PM)
right now i made a hose system to vent both heads and the PCV to the fitting to the carb with a T fitting. seemed to work fine when the pressure switch was pouring oil all over the place....

but now taht i have the switch fixed other problems are creeping up. ran liek a charm until i stopped to get oil.

Lose the PCV valve; it's not doing anything but constipating the crankcase. You're not set up (anymore) to utilize a PCV valve, and if you're not running a breather box arrangement, than THAT'S your problem. I'm sure your VW "mechanic" knew that, right?

One hose to each head vent tube, and one hose to the aforementioned "REMOVED" PCV port (for oil drain back). Do NOT use the plastic-crap hose you receive with the unit; it's garbage and it cracks IMMEDIATELY. The box internally vents to atmosphere (ahh, shucks), which means you'll have a trail of enviro-nazis chasing you around town. The price you pay for going to carbs.

And you thought carbs could fix anything.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
74914LE
post Jul 14 2005, 05:38 PM
Post #34


Member
**

Group: Members
Posts: 136
Joined: 6-April 04
From: Fort Worth, TX
Member No.: 1,895
The topic caught my attention, because I once had the same issue.

Oil was blowing out of the crankcase, very much like you are describing. I tried
everything to solve the problem. Breathers, checking pressure, and then the
loud tapping started. It turned out that the #3 Exhaust Valve Guide had come
loose. The Exhaust Valve was not seating properly, which caused the case to
get pressure back through the push rod tubes, is the theory I came up with.
You can check this by looking at the Valve Adjustment screws, as they will get
hammered as the exhaust valve moves more freely in the guide. Eventually,
the Valve Seat area will start to loose some aluminum, which will show up as a
nice silver paste. When I pulled the head, the valve could be moved around in
the new larger seat that the excess play had caused. Fixed the problem by
replacing the head. My issue was with a 1.7lt. head, but it should not matter.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 06:00 PM
Post #35


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
enviro-nazis?? they dont exist anymore in KY...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rouser
post Jul 14 2005, 06:11 PM
Post #36


Anti-Post Whore
***

Group: Benefactors
Posts: 597
Joined: 30-December 02
From: Citrus Park, Florida
Member No.: 54
QUOTE (bd1308 @ Jul 14 2005, 08:00 PM)
enviro-nazis?? they dont exist anymore in KY...

Unless your state lit a bonfire and can show me the charred remains, they're breediing in every college campus across the country. Some are easier to deal with than others.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 06:15 PM
Post #37


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
what are you on? no emissions testing=no enviro-nazis

you should see some of the cars on the road here....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jul 14 2005, 06:17 PM
Post #38


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
QUOTE (bd1308 @ Jul 14 2005, 05:15 PM)
what are you on? no emissions testing=no enviro-nazis

you should see some of the cars on the road here....

NOT YET !!!!!!

every state is slowly "catching" up to CA...if the US gov. starts to mandate cleaner air, they'll force the states to clean up....it's only a matter of time....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 06:18 PM
Post #39


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
a year ago, my county DROPPED emissions "smog" testing.......

other counties in KY have *never* heard of smog testing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Jul 14 2005, 06:19 PM
Post #40


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
besides its a 74--rolling exemption....

and by that time i'll have a real engine....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

3 Pages V < 1 2 3 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 5th June 2024 - 10:17 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...