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 )

2 Pages V < 1 2  
 Reply to this topicStart new topic
> Pin holes in the head sealing surface..., Can I run as-is, or should they be welded up?
jhadler
post Jul 1 2009, 03:28 PM
Post #21


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
Thanks Jake. Yeah, you're right, it's a big unknown. I'm in a dilemma though. I don't know how much a -proper- repair of this head will cost, and am very tight for funds these days.

edit - I know... Buy cheap, buy twice...

-Josh2

P.S. Jake, can you give me a call sometime? I think you still have my number. Thanks!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Jul 1 2009, 03:37 PM
Post #22


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
FYI, the measurements that I have right now are as follows:

(these are without a head gasket)

Combustion chamber volume: 59.5 cc's
Deck Height: 0.016"
Intake valve to top of piston: 0.220"
Exhaust valve to top of piston: 0.330"
Piston ring end gaps all right around 0.020"

The pushrods and valvetrain geometry were checked and stock pushrods gave me spec lift and all geometry looks good.

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Jul 1 2009, 03:51 PM
Post #23


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
Josh,
I haven't forgotten about you but I don't have your number..
I am actually away from the shop this week, but can call you when I return.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Jul 1 2009, 04:52 PM
Post #24


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
QUOTE(Jake Raby @ Jul 1 2009, 02:51 PM) *

Josh,
I haven't forgotten about you but I don't have your number..
I am actually away from the shop this week, but can call you when I return.


No worries, we can talk next week...

But if you feel like calling, I'm PM'ing you my number...

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
HAM Inc
post Jul 1 2009, 05:14 PM
Post #25


Senior Member
***

Group: Members
Posts: 846
Joined: 24-July 06
From: Watkinsville,GA
Member No.: 6,499
Region Association: None
Attached Image

This head had a pin hole in the same area. Money was tight so no repair was made with the hope that the stud would contain the cylinder pressure. Made it 20 minutes! It blew the stud and you can see what happened after that!

While it's true that this engine had quite a bit more compression than yours probably does, and while it is also true that I have seen a lot of heads that ran for a very long time with pits in this area, it only takes one experience like this for me to take a stand against risking it.

My earlier statement that you probably wouldn't have a catastrophic failure may not be such good advise. Proceed with extreme caution! I think the best advise I could offer would be to fix it right. If that means putting the project on hold and saving some money then so be it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
HAM Inc
post Jul 1 2009, 05:16 PM
Post #26


Senior Member
***

Group: Members
Posts: 846
Joined: 24-July 06
From: Watkinsville,GA
Member No.: 6,499
Region Association: None
BTW, this head landed on my bench in the past month. Very recent failure!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Jul 1 2009, 05:45 PM
Post #27


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
QUOTE(HAM Inc @ Jul 1 2009, 04:16 PM) *

BTW, this head landed on my bench in the past month. Very recent failure!


I also told the Owner of that head that it should be retired..

One day people will listen.... (probably not, they all think our experience is BS and we are just trying to sell them something)

Break enough shit and you'll learn the limitations. No one here as broken more shit than I have.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Aug 27 2009, 03:39 PM
Post #28


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
Well, since the motor is coming out and the heads are coming off after 1.5 hrs of break in time, it might be telling to see if the pin-holes caused any subsequent damage.

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Aug 27 2009, 05:02 PM
Post #29


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

Group: Members
Posts: 11,731
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
Josh,

please update me
obviously its not a good thing... but why is it coming out again?

sorry man
brant
User is online!Profile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Aug 27 2009, 05:46 PM
Post #30


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
If it is a 2.0 head .... replace both of them with new Raby heads ...... then send the two bad heads to me for proper disposal ....... (IMG:style_emoticons/default/shades.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Aug 27 2009, 06:03 PM
Post #31


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
QUOTE(gothspeed @ Aug 27 2009, 03:46 PM) *

If it is a 2.0 head .... replace both of them with new Raby heads ...... then send the two bad heads to me for proper disposal ....... (IMG:style_emoticons/default/shades.gif)


I'd love to put some raby heads on there... You buyin'???

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Aug 27 2009, 06:05 PM
Post #32


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
QUOTE(brant @ Aug 27 2009, 03:02 PM) *

Josh,

please update me
obviously its not a good thing... but why is it coming out again?

sorry man
brant


In the course of trying to find out what was going on with the oil temps, it became apparent that the deck height in the build was too low. No point in risking it when a few shims can resolve that. Just pull the motor, pull the heads etc. add shims, reassemble...

Just a major time demand on time I don't have these days.

It'll get done though...

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Aug 27 2009, 11:10 PM
Post #33


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

Group: Members
Posts: 11,731
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
How did you decide ?
detonation?

brant
User is online!Profile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V < 1 2
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: 20th September 2024 - 04:21 PM
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 ...