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 |
VaccaRabite |
Sep 21 2009, 04:34 PM
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#2
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Hah! I did not even see the youtube clip.
Anyway, that sounds a lot like my motor sounded when the rocker arm backed off the studs. Scared the living daylights out of me at the time. Took about 15 minutes to fix - its just two nuts. Check your valve train fo-sho! I'm sending you positive waves! (IMG:http://www.canadaka.net/modules/My_eGallery/gallery/funnypics/military/ODDBALL_SAYS.jpg) (IMG:style_emoticons/default/driving.gif) Zach |
JazonJJordan |
Sep 22 2009, 11:25 PM
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#3
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Member Group: Members Posts: 340 Joined: 6-June 09 From: Atlanta-Augusta, Georgia area Member No.: 10,446 Region Association: South East States |
(IMG:style_emoticons/default/lol-2.gif) Haha! Zach's brother drives a tank! Good, I'll help fan the positive waves! (good movie man- nice touch~)
Welcome to 914World. (IMG:style_emoticons/default/idea.gif) A few things, It is fixable- it will ride. Just a matter of cheap or not as cheap. Even so, a used 1.7 is just a few hundred and you have a car that 20 grand does not buy. Vintage no less- do not worry. Your motor is a reliable design shared with the VW van of several years and well proven. Large and tough enough for 3 cyl though this is unhealthy- it can still move alone easily on those 3. Let's get it right though, the compression, the valves, then deeper as needed. Engine was made to be "easily" pulled with everything as a pack. Check out the 914 info section and then the tech articles for some specific instructions like removal (when needed-) and others. Smart-simple-happy engineering. (IMG:style_emoticons/default/smash.gif) DO not worry at all- fix and ride, no worries -my friend. Together, there is 4x the knowledge to rebuild your speeder 20 different ways. Enjoy! -Jzn (IMG:style_emoticons/default/shades.gif) Hah! I did not even see the youtube clip. Anyway, that sounds a lot like my motor sounded when the rocker arm backed off the studs. Scared the living daylights out of me at the time. Took about 15 minutes to fix - its just two nuts. Check your valve train fo-sho! I'm sending you positive waves! (IMG:http://www.canadaka.net/modules/My_eGallery/gallery/funnypics/military/ODDBALL_SAYS.jpg) (IMG:style_emoticons/default/driving.gif) Zach |
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