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UberElectricEagle |
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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 ![]() |
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VaccaRabite |
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#2
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En Garde! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region ![]() |
If you are going lean on #2...
Okay, lean is bad. And can cause all sorts of problems. Your carbs need to be balanced against each other and synced properly or you are going to have continuing very hard to fix problems. I know, I just went through it. If you are lean on 2 and not getting fuel on 1, but then 1 starts working at higher RPM, I still think your issue is in your carbs. As revs go up, you move from your idle jets to the intermediate and main jets. A blockage in idle will cease to be a problem as the carbs route the fuel through other jets. BUT lots of driving is done on the idle jets, which would allow the plug to foul up. You need to fix the lean issue. Get your carbs right. Get the linkage right. Look for my thread or NYChef's thread earlier this month or late last month on carb balance. Pull the idle jet out and clean it. with carb cleaner and compressed air. It is located on the outside (non-engine-facing side) of the carb, and is a brass screw just up and to the left of the pump jet. I can see it in your engine pictures (second picture from the bottom). It is NOT the one brass screw with the spring on it, the other brass flathead screw that looks slightly inset in the carb. Reclean your spark plugs and try again. I can't say this enough. It is critical that you get the carbs balanced with one of the tools I pictured above, and the linkage right. Your engine will never run right if your dual carbs are out of sync with each other. The good news: this is all CHEAP stuff. just take time and a Syncometer. Zach |
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