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 )

4 Pages V < 1 2 3 4 >  
 Reply to this topicStart new topic
> Engine failure on track day, need some help, T4 GB 2.0 head failure
CheeRS
post May 18 2019, 02:43 PM
Post #41


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
this screw is not original.
Why make this ?
Perhaps there is a link with the fact the additional air valve was not pluged, so not available.
But the problem is that the installation unable the WOT thottle position


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
billh1963
post May 18 2019, 03:14 PM
Post #42


Car Hoarder!
****

Group: Members
Posts: 3,408
Joined: 28-March 11
From: North Carolina
Member No.: 12,871
Region Association: South East States
I've seen a picture like that before... (IMG:style_emoticons/default/dry.gif)

Before my valve seat dropped I noticed my temperatures were running hotter than normal. Once I pulled the engine I noticed the thermostat had failed...and it failed closed! Yes, someone in the past used a the Mexican made type I thermostat that fails closed

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 28 2019, 09:53 AM
Post #43


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
Hello,
Heads, pistons and cylinders are at the machinist shop.
Now the long block is fully cleaned and I discovered severals scraches than are crossing the engine.
Some pics


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 28 2019, 09:54 AM
Post #44


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
more


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 28 2019, 09:55 AM
Post #45


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
Is the block dead ?


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 28 2019, 09:56 AM
Post #46


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
last one


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 28 2019, 09:57 AM
Post #47


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
with nail we feel an angle so the block has moved
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post May 28 2019, 11:40 AM
Post #48


914 Idiot
***************

Group: Members
Posts: 15,204
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
We would call those "cracks", not "scratches".

If the cracks get into precisely machined areas, like where the cam and the crank run, the case is junk. If it is important to have that specific case with that specific serial number, a really good machinist can probably cut out the cracks and weld them up, then re-machine everything so it is in spec again.

If the cracks do not run into those areas, there's a very good chance that they will spread into those areas. Again, a very good machinist may be able to drill the ends of the cracks and stabilize everything, but that is probably not going to be a permanent solution.

The damage looks to be around the lifter holes. I would be the most concerned about the camshaft bores, because having one of those move will kill the motor pretty quickly. I wonder if that could be related to the "Type IV Syndrome", where someone over-tightens the nut holding the sump plate onto the bottom of the motor? This can bend one of the through-bolts that the oil pickup hangs from, and crack the case around it. Distressingly common.

If you have access to another case, I would suggest using it. That's the simplest way to move forward. If you do not, either find one or find a really good machinist who can weld and machine the existing case.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post May 28 2019, 12:09 PM
Post #49


914 Wizard
**********

Group: Members
Posts: 10,912
Joined: 12-September 04
From: Life Elevated..planet UT.
Member No.: 2,744
Region Association: Rocky Mountains
out side of case,,get a die kit,,,casting flaws ??


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisFoley
post May 28 2019, 06:37 PM
Post #50


I am Tangerine Racing
*****

Group: Members
Posts: 7,990
Joined: 29-January 03
From: Bolton, CT
Member No.: 209
Region Association: None
I see casting lines, not cracks.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jetsetsurfshop
post May 28 2019, 07:40 PM
Post #51


Senior Member
***

Group: Members
Posts: 815
Joined: 7-April 11
From: Marco Island Florida
Member No.: 12,907
Region Association: South East States
QUOTE(ChrisFoley @ May 28 2019, 04:37 PM) *

I see casting lines, not cracks.



Same. Casting lines
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post May 28 2019, 08:53 PM
Post #52


914 Idiot
***************

Group: Members
Posts: 15,204
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Well, if Chris says they're not cracks, believe him over me!!!

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post May 28 2019, 08:54 PM
Post #53


914 Wizard
**********

Group: Members
Posts: 10,912
Joined: 12-September 04
From: Life Elevated..planet UT.
Member No.: 2,744
Region Association: Rocky Mountains
I Pointed to a true solution ...not an opinion..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post May 28 2019, 09:09 PM
Post #54


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
QUOTE(sixnotfour @ May 28 2019, 07:54 PM) *

I Pointed to a true solution ...not an opinion..

Yes, test em....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post May 29 2019, 01:12 PM
Post #55


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

Group: Retired Admin
Posts: 20,180
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
(IMG:style_emoticons/default/agree.gif)

Casting marks. Nothing more.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
CheeRS
post May 31 2019, 02:30 PM
Post #56


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France
(IMG:style_emoticons/default/drunk.gif)
Thanks and CheeRS.

now two more questions :

Where find the thermostat than open
the cooling air flaps ?
If not available, is it a solution to leave them open and if so how ?

Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Montreal914
post May 31 2019, 02:49 PM
Post #57


Senior Member
***

Group: Members
Posts: 1,868
Joined: 8-August 10
From: Claremont, CA
Member No.: 12,023
Region Association: Southern California
I think someone on The Samba is rebuilding them. Not sure this is him. You want to use the accordion type so that if it fails, the flaps will stay open.

https://www.thesamba.com/vw/classifieds/det....php?id=1319589

Also, if you are going with 96mm P/C, therefore 2056cc, you might need to re-calibrate the MPS on the D-Jet (then again maybe not if you are keeping the stock camshaft), others will chime in on that.

You should consider a cylinder head temperature gauge with the thermocouple washer under the spark plug.

Bonne chance! (IMG:style_emoticons/default/beerchug.gif)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
CheeRS
post Jun 1 2019, 12:20 AM
Post #58


Member
**

Group: Members
Posts: 93
Joined: 5-May 19
From: Paris France
Member No.: 23,093
Region Association: France

You should consider a cylinder head temperature gauge with the thermocouple washer under the spark plug.

Could you explain ?

Thanks for the help (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jun 1 2019, 07:54 AM
Post #59


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
http://www.dakotadigital.com/index.cfm/pag...prod/prd347.htm

This gives you instant readings of your head temps as you don't want to go over 425 degrees.
I recommend getting your heads combustion chambers thermal coated to stop the heat sinking and protect the from damage due to heat.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Montreal914
post Jun 1 2019, 10:30 AM
Post #60


Senior Member
***

Group: Members
Posts: 1,868
Joined: 8-August 10
From: Claremont, CA
Member No.: 12,023
Region Association: Southern California
I've been using this one:

http://thesensorconnection.com/cht-sensors...foaAk90EALw_wcB

The key is to have the thermocouple wire (which are two specific materials) run from the washer all the way to the gauge. So you will want to order a sensor with long enough wire to go from engine compartment and route it to the dash. Never extend it with copper wire as you will have a false reading.

It is recommended to install the sensor on Cylinder #3 sparkplug as it is known to have the least amount of cooling due to the engine configuration.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

4 Pages V < 1 2 3 4 >
Reply to this topicStart new topic
2 User(s) are reading this topic (2 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: 19th July 2025 - 02:14 PM
Invision Power Board v9.1.4 © 2025  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 ...