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 )

> in a spin, both feet in!, damage from spinning engine backwards
sean_v8_914
post Apr 24 2006, 12:35 AM
Post #1


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
I looped it at the end of the slalom. I was already on the go pedal hard when she lost traction. I did not expect it, didnt even feel it start to come loose till...whoops(wrong line? marbles? dirty?) well, I did not push the clutch in fast enough and rotated teh engine and trans backwards. the abrupt change in direction of all that mass rotating at 4000rpm was a rather violent affair. I did not photo document everythign because this mornign my camera battery was dead and I just wanted to get it done.

the flywheel and crankshaft were tight. they were in fact welded together from the intense heat geneerated. the locate pin was sheered off. teh bolt holes in teh flywheel are ovaled out. the bolts were bent and left thread marks inside teh bolt holes.

the cooling fan sheered off all 3 bolts and the drift pin. the fan and flywheel are now toast




Attached image(s)
Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
 Reply to this topicStart new topic
Replies(1 - 19)
Brando
post Apr 24 2006, 02:05 AM
Post #2


BUY MY SPARE KIDNEY!!!
****

Group: Members
Posts: 3,935
Joined: 29-August 04
From: Santa Ana, CA
Member No.: 2,648
Region Association: Southern California
Holy raped ape batman! (IMG:style_emoticons/default/sad.gif)

How's it look inside?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Joseph Mills
post Apr 24 2006, 06:43 AM
Post #3


on a Sonoma diet now...
***

Group: Members
Posts: 1,482
Joined: 29-December 02
From: Oklahoma City, OK
Member No.: 39
QUOTE(sean_v8_914 @ Apr 24 2006, 01:35 AM) *

I looped it at the end of the slalom.

well, I did not push the clutch in fast enough and rotated teh engine and trans backwards.

the cooling fan sheered off all 3 bolts and the drift pin. the fan and flywheel are now toast




(IMG:style_emoticons/default/ohmy.gif)

Man, that is some really bad luck! (IMG:style_emoticons/default/mad.gif)


I've seen many cars spin and roll backwards (ahem, including mine), and I have never seen such destructive consequences.

Time to block out a few evenings and git'her fixed. (IMG:style_emoticons/default/smash.gif)

..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jhadler
post Apr 24 2006, 10:46 AM
Post #4


Long term tinkerer...
***

Group: Members
Posts: 1,879
Joined: 7-April 03
From: Lyons, CO
Member No.: 529
Yoiks!!

I can only imagine the carnage inside the case... I hope the external mess is all there is, but it sure don't look good...

I've seen a bunch of people spin and reverse their motors, but I've never seen a motor destruct like that. Often, it's stuff like intake plumbing that gets blown out from being pressurized by the motor.

Good luke, I hope that it gets fixed quickly. The season has only just begun!

-Josh2
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Apr 24 2006, 11:01 AM
Post #5


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

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

that must have made a racket !!!!

I have a fan you can have if you don't have an extra 1 yourself.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
J P Stein
post Apr 24 2006, 01:00 PM
Post #6


Irrelevant old fart
*****

Group: Members
Posts: 8,797
Joined: 30-December 02
From: Vancouver, WA
Member No.: 45
Region Association: None
I comprehensivly looped it in a slalom yesterday.
It only cost me 10 sec.......I have lotso practice. (IMG:style_emoticons/default/idea.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Apr 24 2006, 01:30 PM
Post #7


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
CArnage! (IMG:style_emoticons/default/chowtime.gif)

never seen one do that before....

faster left foot (IMG:style_emoticons/default/smile.gif)

hope it is all external
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
hmeeder
post Apr 24 2006, 01:42 PM
Post #8


Dante's Sportscar
**

Group: Members
Posts: 352
Joined: 21-November 04
From: San Diego, CA
Member No.: 3,154
QUOTE(Aaron Cox @ Apr 24 2006, 12:30 PM) *

CArnage! (IMG:style_emoticons/default/chowtime.gif)

never seen one do that before....

faster left foot (IMG:style_emoticons/default/smile.gif)

hope it is all external


It was up and running two days later and didn't seem like the damage was internal. Since then he found the fan damage (hub bolts sheared.) he was on the freeway the at time and the car heated up like crazy. Started pinging like a mad dog at 2000 rpm before he shut it down.

If there's internal damage, I'm thinking that may be a more likely cause, as it was running strong prior to the overheat.

Sean also has an oil leak at the pump and has decidied to pull the motor and take care of that while he's at it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Apr 24 2006, 01:44 PM
Post #9


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
the Gen light should have come on if he lost the fan......
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
skline
post Apr 24 2006, 01:51 PM
Post #10


Born to Drive
*****

Group: Members
Posts: 7,910
Joined: 26-December 02
From: Costa Mesa, CA
Member No.: 17
Region Association: Southern California
Going by what he showed in the pictures and his description, I would bet the crank is screwed up and would not trust it. Anyone want to wager on it?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Andyrew
post Apr 24 2006, 01:53 PM
Post #11


Spooling.... Please wait
**********

Group: Members
Posts: 13,376
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
engine needed more tq so it would light the tires, not rotate them... lol

sucks... looks like $$$
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
hmeeder
post Apr 24 2006, 02:09 PM
Post #12


Dante's Sportscar
**

Group: Members
Posts: 352
Joined: 21-November 04
From: San Diego, CA
Member No.: 3,154
QUOTE
the Gen light should have come on if he lost the fan......


Yep, it did. Unfortunately, on a sunny day, that damned light isn't very obvious. It wasn't until he heard the pinging that he saw the light.

Seems pretty upbeat, despite everything. He's got plenty of parts to build another motor.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
skline
post Apr 24 2006, 02:12 PM
Post #13


Born to Drive
*****

Group: Members
Posts: 7,910
Joined: 26-December 02
From: Costa Mesa, CA
Member No.: 17
Region Association: Southern California
QUOTE(hmeeder @ Apr 24 2006, 01:09 PM) *

QUOTE
the Gen light should have come on if he lost the fan......


Yep, it did. Unfortunately, on a sunny day, that damned light isn't very obvious. It wasn't until he heard the pinging that he saw the light.

Seems pretty upbeat, despite everything. He's got plenty of parts to build another motor.



That is because Sean is a Pack Rat! I have known him for a few years now and he keeps everything unless he is absolutely sure he will not need it ten years down the road. He has quite a stash. I only wish he lived closer.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
hmeeder
post Apr 24 2006, 03:36 PM
Post #14


Dante's Sportscar
**

Group: Members
Posts: 352
Joined: 21-November 04
From: San Diego, CA
Member No.: 3,154
QUOTE
That is because Sean is a Pack Rat!


Don't I know it! Whenever I need anything I call him first. He lives about 2 miles from me and without his help, I would not be driving right now.

In fact, he's pretty much responsible for the motor's configuration and I don't thank him publicly enough for all he does. He also seems to get a genuine kick out of keeping as many people on the road as he can, so he's a pure 914 non-club kind of guy.

For my part, I try to help him as much as I can with his driving skills. If I don't have a student, he's in my car or I'm in his. He's making good progress (except that spin, that is. That wasn't on the ciriculum!)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
skline
post Apr 24 2006, 03:38 PM
Post #15


Born to Drive
*****

Group: Members
Posts: 7,910
Joined: 26-December 02
From: Costa Mesa, CA
Member No.: 17
Region Association: Southern California
So its a case of the blind leading the blind? (IMG:style_emoticons/default/av-943.gif)

Sorry, I just couldnt help myself on that one. (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
hmeeder
post Apr 24 2006, 03:54 PM
Post #16


Dante's Sportscar
**

Group: Members
Posts: 352
Joined: 21-November 04
From: San Diego, CA
Member No.: 3,154
QUOTE
So its a case of the blind leading the blind?


Hence the white canes taped to the fenders! (IMG:style_emoticons/default/laugh.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Apr 24 2006, 06:42 PM
Post #17


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
Wow, I never thought such a small amount of rotation would cause that much galling! It couldn't have moved more than a few degrees, right? It seems to me that a flywheel would never sit flat on that crank now, and it could lead to wierd clutch problems.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 25 2006, 02:13 AM
Post #18


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

Group: Members
Posts: 14,991
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
QUOTE(skline @ Apr 24 2006, 12:51 PM) *

Going by what he showed in the pictures and his description, I would bet the crank is screwed up and would not trust it. Anyone want to wager on it?


I sure as hell would not be willing to trust that crankshaft any more!!

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mugs914
post Apr 25 2006, 09:17 AM
Post #19


"Hey, yellow IS faster!"
***

Group: Members
Posts: 618
Joined: 22-July 05
From: Temple TEXAS
Member No.: 4,452
Region Association: Southwest Region
(IMG:style_emoticons/default/agree.gif) That one needs to become a lamp...

Sorry to hear about that Sean. Hope it all comes good.

BTW- Despite what Herb says, reversing through the slaloms has never been the quickest way for me... (IMG:style_emoticons/default/dry.gif) (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Apr 25 2006, 10:51 AM
Post #20


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
wow. thanks for teh nice comments

the car is running again. the clutch is "funny" but OK for now. I dont trust any of it. I WILL be at teh next AX.

I had teh top off (of course)and teh sun was warm and bright and I was in traffic, too busy watchign cars not gauges. . I was rolling very light on teh throttle due to traffic so it wasnt till I got free of teh car clot that I really heard the ping and cheched gauges. once I noticed the oil temp creeping up, I noticed the pinging getting worse. then i put 2+2 together and looked at teh gen light. I coasted from Childrens hospital on teh 805s to the bottom of the ramp on 8east.

I made teh oil leak worse. I will remove the power package next week again to fix teh oil pump. the pump gear got smacked rather hard also. the spin was very quick, no tim e to really catch it. the ass end really whipped around quickly. I suspect gravel, marbles or oil on teh track. I am fairly good at catching the car (right Herb?)
User is offlineProfile 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: Switch to: Standard · Linear+ · Switch to: Outline

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

- Lo-Fi Version Time is now: 17th June 2024 - 10:03 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 ...