Opinions- Cutting notch in head for ring CHT sender |
|
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. |
|
Opinions- Cutting notch in head for ring CHT sender |
tornik550 |
Mar 10 2013, 05:44 PM
Post
#1
|
Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
I have always had a hard time getting ring type cylinder head temp senders installed correctly. I was looking around online and found a post on samba regarding this issue. Below is a picture from that post. What do you think?
Attached thumbnail(s) |
tornik550 |
Mar 10 2013, 05:47 PM
Post
#2
|
Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
another
Attached thumbnail(s) |
mrbubblehead |
Mar 10 2013, 05:52 PM
Post
#3
|
Twodollardoug Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California |
thats exactly how i did mine.
|
nathansnathan |
Mar 10 2013, 07:18 PM
Post
#4
|
Senior Member Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None |
It is done according to the german supply how-to article. They did it slightly wrong there as you are supposed to cut the washer off the spark plug, using the ring terminal as the washer - which keeps all the spark plugs seated in the head the same depth.
It is surprising how much needs to be taken out to fit it as I have done this. (IMG:style_emoticons/default/smile.gif) But it does work pretty good - you will destroy the $30 thermocoupler wire every time you take out that plug otherwise. |
Cap'n Krusty |
Mar 10 2013, 07:36 PM
Post
#5
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
The use of a platinum plug in the illustration destroys the credibility of the author ..................
The Cap'n |
tornik550 |
Mar 10 2013, 07:40 PM
Post
#6
|
Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
|
VaccaRabite |
Mar 11 2013, 08:20 AM
Post
#7
|
En Garde! Group: Admin Posts: 13,544 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
That is what I have done with my heads for the CHT leads.
And, yeah. Gotta get rid if the washer on the spark plug. Zach |
jim_hoyland |
Mar 11 2013, 09:37 AM
Post
#8
|
Get that VIN ? Group: Members Posts: 9,410 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Can the notch be made if the motor is in the car ? I installed a CHT several months ago but haven't done a spark plug change yet.. (IMG:style_emoticons/default/sad.gif)
|
VaccaRabite |
Mar 11 2013, 10:19 AM
Post
#9
|
En Garde! Group: Admin Posts: 13,544 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Can the notch be made if the motor is in the car ? I installed a CHT several months ago but haven't done a spark plug change yet.. (IMG:style_emoticons/default/sad.gif) Can it? Sure. If you have a grinder that will get down there, there is not much stopping you. Should it? No. You don't want metal shavings in your combustion chamber do you? Or grinding against your fuel lines? Zach |
Cap'n Krusty |
Mar 11 2013, 10:28 AM
Post
#10
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Can the notch be made if the motor is in the car ? I installed a CHT several months ago but haven't done a spark plug change yet.. (IMG:style_emoticons/default/sad.gif) Can it? Sure. If you have a grinder that will get down there, there is not much stopping you. Should it? No. You don't want metal shavings in your combustion chamber do you? Or grinding against your fuel lines? Zach You forgot "you don't wanna slip and cut into the spark plug sealing surface, do you"? The Cap'n |
worn |
Mar 11 2013, 10:48 AM
Post
#11
|
can't remember Group: Members Posts: 3,283 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
Can the notch be made if the motor is in the car ? I installed a CHT several months ago but haven't done a spark plug change yet.. (IMG:style_emoticons/default/sad.gif) Can it? Sure. If you have a grinder that will get down there, there is not much stopping you. Should it? No. You don't want metal shavings in your combustion chamber do you? Or grinding against your fuel lines? Zach One of my favorite tools is a small die grinder with a tungsten carbide burr. It cuts sort of like a very small Jedi light saber. A very, very small one (IMG:style_emoticons/default/lol-2.gif) . One *could* do the cut with a scrap spark plug or bolt in the hole and then thoroughly blow out the shavings with air. Or as an alternative add grease to the plug or bolt to catch the shavings. With care it might end up pretty comparable to pulling a plug after driving on dirty road surfaces - except for the aluminum may be softer than grit. |
tradisrad |
Mar 11 2013, 10:54 AM
Post
#12
|
Senior Member Group: Members Posts: 985 Joined: 11-September 06 From: San Mateo, CA Member No.: 6,815 Region Association: Northern California |
I installed and grooved mine while the engine was in the car. A friend had made a plug out of a modified a spark plug. He modified the spark plug by cutting it in half and making a screw driver slot out of expoy. Worked great to keep the shavings out of the cylinder. Shop vac and compressor to clean up.
|
tornik550 |
Mar 11 2013, 10:55 AM
Post
#13
|
Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
I did this modification last night. My engine is outside of the car however I can see how this could be safely done with the engine in the car (however would be a pain). The tin needs to be removed. I used a wooden dowel to block the plug hole- I actually just screwed it into the hole. I also put vaseline on the dowel to help catch any shavings. I carefully ground down the material making sure to not hit the sealing surface. After finished, I backed out the dowel, most of the shavings stuck to the vaseline. The rest I just cleaned with a rag. No shavings in the plug hole.
|
maf914 |
Mar 12 2013, 11:59 AM
Post
#14
|
Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
Thanks for posting those photos. I need to do this and never was completely sure how it was done. Thanks.
|
ThePaintedMan |
Mar 12 2013, 12:10 PM
Post
#15
|
Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
I'd like to do this too. But first I need to find a thermocouple that fits our spark plugs. The one I got with my VDO gauge had to be reamed out to fit over the spark plug. But its gotten so mangled now I doubt its even close to accurate (I know they aren't all that accurate in the first place). Can anyone suggest a place to get the correct size for the plugs in a 1.7?
|
mrbubblehead |
Mar 12 2013, 12:15 PM
Post
#16
|
Twodollardoug Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California |
I'd like to do this too. But first I need to find a thermocouple that fits our spark plugs. The one I got with my VDO gauge had to be reamed out to fit over the spark plug. But its gotten so mangled now I doubt its even close to accurate (I know they aren't all that accurate in the first place). Can anyone suggest a place to get the correct size for the plugs in a 1.7? good luck finding a 14mm ring terminal. if you find em let us know. i have been reaming 12mm ones with a spud bar to spread them open to 14mm. its better than drilling in my opinion. |
ThePaintedMan |
Mar 12 2013, 12:27 PM
Post
#17
|
Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
I'd like to do this too. But first I need to find a thermocouple that fits our spark plugs. The one I got with my VDO gauge had to be reamed out to fit over the spark plug. But its gotten so mangled now I doubt its even close to accurate (I know they aren't all that accurate in the first place). Can anyone suggest a place to get the correct size for the plugs in a 1.7? good luck finding a 14mm ring terminal. if you find em let us know. i have been reaming 12mm ones with a spud bar to spread them open to 14mm. its better than drilling in my opinion. But still may have an impact on accuracy, correct? |
mrbubblehead |
Mar 12 2013, 12:31 PM
Post
#18
|
Twodollardoug Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California |
I'd like to do this too. But first I need to find a thermocouple that fits our spark plugs. The one I got with my VDO gauge had to be reamed out to fit over the spark plug. But its gotten so mangled now I doubt its even close to accurate (I know they aren't all that accurate in the first place). Can anyone suggest a place to get the correct size for the plugs in a 1.7? good luck finding a 14mm ring terminal. if you find em let us know. i have been reaming 12mm ones with a spud bar to spread them open to 14mm. its better than drilling in my opinion. But still may have an impact on accuracy, correct? nope, it all depends on the type of gauge you use. the "themalcouples" are just crimped ring terminals.... |
ChrisFoley |
Mar 12 2013, 01:00 PM
Post
#19
|
I am Tangerine Racing Group: Members Posts: 7,958 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
All the 12mm ring t/cs from aircraft insrument mfrs are just 1/2" ring terminals,
and the 14mm ones are just reamed out 1/2" ring terminals. |
ThePaintedMan |
Mar 12 2013, 01:11 PM
Post
#20
|
Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
All the 12mm ring t/cs from aircraft insrument mfrs are just 1/2" ring terminals, and the 14mm ones are just reamed out 1/2" ring terminals. Got it. I thought that the gauges were calibrated to the terminal though, or vice versa? As in, you could replace just the terminal with one that was drilled or spread out to 14 mm, but it would impact the readings of the gauge or the electrical signal sent to it, resulting from the temperature seen at the ring. |
Lo-Fi Version | Time is now: 20th September 2024 - 06:18 PM |
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 ... |