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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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 Posted: Tue Dec 07, 2004 10:18 am Post subject: Can I hear my injectors firing? |
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With the temporary removal of my heater ,I now have a hole going through my firewall that makes the engine sounds quite audible.
I hear a tapping apon load and rpm that I would like to blame on the injectors.
Do they make this tapping sound?
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Tue Dec 07, 2004 10:31 am Post subject: |
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No, CIS injectors just spray continuously, so there's no tapping noise from them. Tapping under load can be detonation/knock. Other than that, the main source of tapping sounds is the valves.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Tue Dec 07, 2004 12:19 pm Post subject: |
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Yea, that’s what I was afraid of. I think the new lighter distributor spring I put in is giving too much advance in conjunction with the vacuum can.
I don't see how though because my full advance is still in at only 4300rpm.
I put the oem distrib back in and I'll see on the road tomorrow if I still hear it.
It’s my luck to have the hole in now. I always try to never ignore these signs.
I think the timing of the heater failure and the hole so that I can hear the tap are the Porsche gods smiling down on me. 
I hope the curving project does not go belly up, but it might. Its too bad ,its seems to be working.
_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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macBdog
Joined: 16 Aug 2004
Posts: 1111
Location: Brisbane, Australia
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| Posted: Tue Dec 07, 2004 1:00 pm Post subject: |
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I get quite a loud constant noise from my head/valves. Not sure what I can do about it and if its the cam lobes hitting the tappets or the valves closing?
The next thing on my list of jobs is the check and adjust the valve clearances, do you guys think this could reduce the top end tapping noise I speak of?
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1979 931 with a 350 chev
1973 911E with EFI
| p-talk wrote: | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways  |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Dec 08, 2004 2:45 am Post subject: |
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| macBdog wrote: | | The next thing on my list of jobs is the check and adjust the valve clearances, do you guys think this could reduce the top end tapping noise I speak of? |
Adjusting the valve clearances is definitely the first thing to eliminate, MacB. My 'top end' was quite noisy when I first got the car and I found that some of the clearances were 4 times too wide! 
Getting the clearances right certainly reduced the noise at lot, but did not get it down to zero...!
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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| Posted: Wed Dec 08, 2004 10:51 am Post subject: |
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Ping is gone with the OEM distrib.
Rats.
Euro-curve spring project is History.
_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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