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#1
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Member ![]() ![]() Group: Members Posts: 58 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains ![]() ![]() |
Yesterday just before getting home I heard a click from the engine then again. It wasn't steady, just every little bit I would hear it. I could feel that I lost power and it even stalled once at a stop light. Since I was only a couple block from home I just keep going.
I found that cylinder 3 could only produce 20 lbs of compression. A leak down test was 22% with most air coming out of the intake. For reference the other cylinders were 100 to 105 compression and the leak down was 18% to 20% with air noticed just in the oil filler hole. I don't know how accurate my testing tools are since they are cheap ones I got from amazon and harbor freight. I took off of my valve cover for cylinders 3 and 4 and with cylinder 3 at TDC I have over 1/2 inch of play with both valves and the pushrods are of course way loose. I haven't removed the rockers to pull the pushrods out yet to see if they are bent. I will do that after I pulling the engine either tomorrow or this weekend. How screwed am I? Thoughts on best and worse case? Here's a video of my loose rocker Video of rockers |
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#2
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Member ![]() ![]() Group: Members Posts: 58 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains ![]() ![]() |
I torqued them to 10ft/lbs. I put the engine back in today check compression and leak down before I started it. Compress was 95 and leak down was 22%. I started it up and it idle great and revving the engines was as well. It didn't seem to have its normal power while driving. I wasn't pushing it at all but could still tell something is still off. It seemed like it was running rich and missing a bit. After I got back I rechecked compression and leak down on all cylinders while still hot. Compression was, starting on cylinder 1: 102, 105, 100, 105. Leak down was 14, 18, 21, 16. That's normal for my engine since I got it. From that I think the engine is fine. Am I missing something?
Next steps is rechecking the timing which I've set not too long ago. I have a 009 distributor with a comp-u-fire module and dual DCNF Webers. Setting time is something I'm not comfortable with. It just doesn't seem to work the same as what I read in the manual. It leaves me scratching my head. After that I'll go through the carbs again. It did seem to run rich on the test drive. It has never felt like that before. I had just got the car running good when the rocker blew. To get it to run good I had to step up to a 65 idle jet which is way big I know. It had 57.5 but backfired at idle and at 2500 RPMs. The car has had a high heating issue since I bought which I haven't solved. Maybe that rocker was screwing with my mixture enough to think I had to increase my idle fuel. |
porschetub |
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#3
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,708 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None ![]() |
I torqued them to 10ft/lbs. I put the engine back in today check compression and leak down before I started it. Compress was 95 and leak down was 22%. I started it up and it idle great and revving the engines was as well. It didn't seem to have its normal power while driving. I wasn't pushing it at all but could still tell something is still off. It seemed like it was running rich and missing a bit. After I got back I rechecked compression and leak down on all cylinders while still hot. Compression was, starting on cylinder 1: 102, 105, 100, 105. Leak down was 14, 18, 21, 16. That's normal for my engine since I got it. From that I think the engine is fine. Am I missing something? Next steps is rechecking the timing which I've set not too long ago. I have a 009 distributor with a comp-u-fire module and dual DCNF Webers. Setting time is something I'm not comfortable with. It just doesn't seem to work the same as what I read in the manual. It leaves me scratching my head. After that I'll go through the carbs again. It did seem to run rich on the test drive. It has never felt like that before. I had just got the car running good when the rocker blew. To get it to run good I had to step up to a 65 idle jet which is way big I know. It had 57.5 but backfired at idle and at 2500 RPMs. The car has had a high heating issue since I bought which I haven't solved. Maybe that rocker was screwing with my mixture enough to think I had to increase my idle fuel. Excellant result if they held 10 ft/lbs you should be fine ,I ran 36DCNV's which were the last series made in the 80's so the most modern type of these,great carbs ,I don't remember the exact size of the idle jets but #52 rings a bell you may find yours are too big causing the back fires especially if you have poor response from the mixture screws . I built some custom inlet manifolds and made up a linkage out of T4 carb parts ,bolted up and balanced they were a breeze to tune ,I never changed any jets but did fully rebuild them. Cheers. |
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