914 1.7 Knocking Sound -- New Here, First Post, Horrible knocking coming from the motor |
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914 1.7 Knocking Sound -- New Here, First Post, Horrible knocking coming from the motor |
UberElectricEagle |
Sep 20 2009, 07:20 PM
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#1
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atomic Group: Members Posts: 43 Joined: 10-August 09 Member No.: 10,659 Region Association: None |
Greetings. I am new to the Porsche world and I purchased a 1972 914 1.7 about a month ago. It's a pretty nice car over all, but I think the motor, or part of the motor, might be toast.
When I purchased it, it badly needed a muffler. The knocking noise was harder to notice and sounded more like an exhaust leak over the horrible sound of the lack of a working muffler. The car seemed to run decent even with the poor exhaust and the price was good so I bought it. I just wanted a decent car over all that I could drive around for fun on sunny days before the winter gets here. It came with stainless heat exchangers I installed and I installed a really nice dual muffler from Dave at Triad. When I fired it up with the new muffler, I really noticed the knocking when I drove it since the all the exhaust leaks were now sealed up and I wasn't wearing ear plugs. At idle it's not too bad, but once I get going, the knocking is very noticeable. It's odd too, because it's not real consistent under power in motion. To me it sounds like the noise is coming from the #1 cylinder. I think the cylinder is providing no power, because when I take the wire off the cap, there is really no change in performance. (I put a video link of the horrible sound below.) Any advice on where to go from here would be great. My gut feeling is telling me the motor is going to have to come out. If I'm going to do all that, I might as well put a 2.0 liter in or ????? I'd even settle for just a solid running motor with some minor upgrades to make it a little quicker. Any advice on what route to take on a good used motor would be great. I guess A motor that runs on 4 cylinders would be an upgrade. Thanks for your help, a mildly depressed Sam http://www.youtube.com/watch?v=a5JhEd7SUH4...re=channel_page |
Rod |
Sep 21 2009, 03:43 AM
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#2
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Senior Member Group: Members Posts: 616 Joined: 1-January 08 From: Farnham UK Member No.: 8,526 Region Association: England |
welcome. Do a valve train check first. Shame the car has lost it's FI (IMG:style_emoticons/default/sad.gif)
I run a standard 1.7l with D-jet and it's a great little motor... Did 400 miles over the weekend and it ran as sweet as a nut. Yes 170hp would be nice, but it keeps up with modern traffic very easily.. Do you like the sound of the Triad?? (IMG:style_emoticons/default/biggrin.gif) |
UberElectricEagle |
Sep 21 2009, 02:11 PM
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#3
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atomic Group: Members Posts: 43 Joined: 10-August 09 Member No.: 10,659 Region Association: None |
welcome. Do a valve train check first. Shame the car has lost it's FI (IMG:style_emoticons/default/sad.gif) I run a standard 1.7l with D-jet and it's a great little motor... Did 400 miles over the weekend and it ran as sweet as a nut. Yes 170hp would be nice, but it keeps up with modern traffic very easily.. Do you like the sound of the Triad?? (IMG:style_emoticons/default/biggrin.gif) Thanks. I too was sad the fuel injection car was gone, but was happy to see two carbs instead of one. (probably does not need dual carbs) I was real pleased it has 5 speeds and does great on the freeway even on 3 cylinders. I'm surprised it runs as well as it does even with the malfunction. I know I'll be much more pleased with 4 fully functioning cylinders. I do like the sound of the Triad and I like how it looks too. I just wish I could hear it with a healthy motor because I think it will sound even better. It's built really well and I'd recommend one if you are looking for louder than stock. It's a good price for the quality. |
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