 Head temps, HOT, difference between 1 and 3 |
|
|
|
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. |
|
|
| yarin |
 Apr 15 2007, 07:46 AM
Post
#1
|
|
'14-X'in FOOL  Group: Members Posts: 988 Joined: 13-May 03 From: Guttenberg, NJ Member No.: 693 Region Association: North East States  |
I've got two of the VDO spark plug type head temp sensors. One on cyl 1 and one on cyl 3. I know that cyl 3 is the hottest, but i'm seeing differences of ballpark 30-40 degrees between the two. From the drivers seat I can't accurately read the gauges, so i'm going to move the gauges somewhere else and see how hot the temps get.
On the track the #1 cyl gets to about 365F. The #3 gets hot, unconfortably hot for me. I thinking around 400. I tried retarding timing 5-6 degrees total, didn't seem to make a difference. A little history: the PO was doing a hill climb and literally melted the right side of the engine (cyl 3 side). He had the head rebuilt and slapped it back together. Before I converted to megasquirt the carbs had all this metal crap (aluminum maybe) welded to the inside of the butterfly valves. I'm thinking this head really had a melt down. #3 always run hotter than #1, even at idle. I'm going check reading on my stock injection head temp sensor and see what Megasquirt says. It was bugging the shit out of me at the track. I kept looking over instead of concentrating on the course. Thanks Attached image(s) 
|
   |
 
|
  |
Replies
| Jake Raby |
Apr 15 2007, 06:50 PM
Post
#2
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The stock system is not bad, WHEN IT IS SET UP PROPERLY. These days few people understand the proper way it all goes together.
The other big issue is keeping the cooling fan clean, dirty fans can elevate temps by 30-50F easily. Modifying the cooling system to work better than factory is NOT an easy task. Generally any attempt to do this without extensive means of monitoring changes will result in negative results and I have certainly had my share of those. The key is not generating heat, thats the easiest way to make the stock system more effective! I have been working on some mods for the stock cooling system, primarily for VW Bus owners as there are more of those on the road than 914s and they have 4,500 pounds to push around (they also open their wallets for things that work) but the mods are the same for the 914 engine. Honestly an engine should not run hot, even in extreme climates if it is configured correctly and in tune. The stock engine is the hottest running of all- |
|
|
|
Posts in this topic
yarin Head temps, HOT Apr 15 2007, 07:46 AM
41ghost pesonally i do not think that the vdo works yery w... Apr 15 2007, 07:59 AM Jake Raby The stock cooling system has imbalance issues betw... Apr 15 2007, 10:41 AM BMXerror Well, is anyone going to ask it? I know this will ... Apr 15 2007, 11:06 AM
Dave_Darling Is there a factory spec for "don't get o... Apr 15 2007, 09:29 PM 41ghost when i say the temp fluxuates up and down to a poi... Apr 15 2007, 11:31 AM yarin
when i say the temp fluxuates up and down to a po... Apr 15 2007, 11:45 AM bperry Also, aren't there 2 different VDO sensor/gaug... Apr 15 2007, 11:53 AM Jake Raby The following temps are based on the readings I ha... Apr 15 2007, 12:11 PM 41ghost very usefull info , thanks again jake. Apr 15 2007, 12:18 PM computers4kids
The following temps are based on the readings I h... Apr 15 2007, 12:41 PM Brando This question might seem counter-productive, but a... Apr 15 2007, 12:52 PM 41ghost does it help for cooling to change your 914 engine... Apr 15 2007, 06:55 PM Bleyseng It helps to remove the rain tray by 10-20F on the ... Apr 15 2007, 07:44 PM Twystd1 Then there is the question of accuracy of the VDO ... Apr 15 2007, 08:17 PM yarin
Exactly... both visual resolution and accuracy. ... Apr 15 2007, 10:32 PM bd1308 i have one....works great! Apr 15 2007, 10:54 PM Jake Raby The VDO is not the best instrument for total accur... Apr 16 2007, 06:22 AM Joe Ricard Yarin, you can always back up your VDO gauges with... Apr 16 2007, 06:51 AM yarin
Yarin, you can always back up your VDO gauges wit... Apr 16 2007, 10:40 AM yarin I got my gauge. Slight problem....
The spark plug... May 10 2007, 05:49 PM toon1
I got my gauge. Slight problem....
The spark plu... May 10 2007, 05:59 PM ptravnic Yarin - As for being able to see both gauges at th... May 10 2007, 08:57 PM yarin
Yarin - As for being able to see both gauges at t... May 10 2007, 09:46 PM yarin I emailed tech support, got this response:
... May 11 2007, 10:10 AM |
6 User(s) are reading this topic (6 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 26th September 2024 - 08:08 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.