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930cabman |
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#1
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,169 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States ![]() ![]() |
My /6 conversion is going on 3 years as it seems as many do. I had a local old school reputable shop build the stock 2.7, case was done at Ollies, .... should be a great engine. Finally trying to get her barking, but just won't take hold. While cranking she wants to start, but when I release the starter, she conks out. We have a spark (not real significant), timing is close, carbs appear ok.
Is it possible the valves or maybe rings are not sealing because the engine sat for about 2 years? |
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technicalninja |
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#2
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,531 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region ![]() ![]() |
Running the compression test WILL verify cam timing!
Sort of... The thing that most effects compression test readings is intake valve closure. If you have a cam timing screw up on one side, you WILL have similar compression readings per bank but the readings between the two banks will differ. Driver side all read 190 and passenger side all read 145 you have a cam timing issue. It's also the reason I mentioned checking valve adjustment before tear down. The valves adjusted incorrectly will vary compression readings although not nearly as much as the cam timing being out. Have you done a compression test yet? I just love the offset cam timing holes like the 911 has. You can alter your cam timing without having to buy special gears or strange "offset" bushings. That set up is "completely adjustable" cam timing from the factory! It requires that the technician fully understands what he's doing but is "THE WAY" in my book for adjustable cam timing. They all aught to be like that! |
930cabman |
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#3
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,169 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States ![]() ![]() |
Running the compression test WILL verify cam timing! Sort of... The thing that most effects compression test readings is intake valve closure. If you have a cam timing screw up on one side, you WILL have similar compression readings per bank but the readings between the two banks will differ. Driver side all read 190 and passenger side all read 145 you have a cam timing issue. It's also the reason I mentioned checking valve adjustment before tear down. The valves adjusted incorrectly will vary compression readings although not nearly as much as the cam timing being out. Have you done a compression test yet? I just love the offset cam timing holes like the 911 has. You can alter your cam timing without having to buy special gears or strange "offset" bushings. That set up is "completely adjustable" cam timing from the factory! It requires that the technician fully understands what he's doing but is "THE WAY" in my book for adjustable cam timing. They all aught to be like that! No compression test yet, funny, my doctor prior to hip replacement a week and a half ago was adamant " do not work on cars for at least 4 weeks" and she had no idea I was a 914 nut I am hoping next week to get back into the car shop |
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