Originally Posted by Ryan_G
(Post 1208606)
Its definitely mechanical timing. Here are some pictures to illustrate the problem. All of the exterior markings line up perfectly and I was able to verify that cylinder one was at TDC when it was suppose to be.
Well that is not right.....the intake cam should be pointing to the 9 O'clock postion and not the 12 O'clock position. How the fuck did that happen. If I remember correctly there is a guide pin and the cam gear can really only slide on one way. I need to take it off and figure out the problem. |
I don't know how it is on wrong to be honest. When I put it on the first time it was clear that it could only go on one way and I am pretty sure I got it on the guide pin. You would think if it wasn't on the guide pin that it would stick out a little bit but it is as far back as possible without these bolts on the back of the gear making contact with the head. I wasn't able to take it off on Sunday to check because I had some family stuff going on.
There was one bit that might need fixing that I have been thinking about. When we were taking the motor apart originally, Miata2fast was curious how the vvt mechanism worked so he decided to open it up. There was a bit of an oh shit moment but he put it back together and was pretty sure it was correct but I am not thinking I might need to reopen it and take a look. I'll have to analyze a parts diagram to make sure I get it back together correctly. Not sure if the cam could advance itself this much if it was assembled incorrectly but I won't know until I get it off. |
Originally Posted by Ryan_G
(Post 1208787)
I don't know how it is on wrong to be honest. When I put it on the first time it was clear that it could only go on one way and I am pretty sure I got it on the guide pin. You would think if it wasn't on the guide pin that it would stick out a little bit but it is as far back as possible without these bolts on the back of the gear making contact with the head. I wasn't able to take it off on Sunday to check because I had some family stuff going on.
There was one bit that might need fixing that I have been thinking about. When we were taking the motor apart originally, Miata2fast was curious how the vvt mechanism worked so he decided to open it up. There was a bit of an oh shit moment but he put it back together and was pretty sure it was correct but I am not thinking I might need to reopen it and take a look. I'll have to analyze a parts diagram to make sure I get it back together correctly. Not sure if the cam could advance itself this much if it was assembled incorrectly but I won't know until I get it off. |
The thread 18psi linked in my build thread has pictures of when he took his apart. I'll probably use that for reference.
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I took one apart and documented for posterity:
https://www.miataturbo.net/engine-pe...or-pics-80407/ Is the gear locked? you should not be able to spin the cam independent of the gear/belt |
Hmm. 4 lobes inside.
It could have gone together 90 degrees out? Stranger things have happened. |
If it was put back together 90* off I would be kind of impressed seeing as how the single large lobe also has a significantly larger space to fit in. No one knows but Troy! I do believe the gear is locked.
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All I can do is guess. . I'm trying.
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Not sure anymore, but didn't you at one point say there's no spark? Verified with a timing gun?
This would not be caused by the Camshaft- no matter how far off it may be. |
Spark was verified in test mode. Timing light was not picking it up but I saw it with my eyes.
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IT'S ALIVE!!!!! The physical cam alignment was indeed the problem. However, It appears as if something else is going on. We used the little dot mark to line it up as it was 90 degrees off of the slot mark on the cam gear. Every VVT timing picture we have looked at show that the markings I had originally used should have been correct. The VVT actuator can only bolt to the gear one way due to bolt spacing and the cam has to be seated on the peg due to spacing. I am not sure why mine runs perfectly while using the other gear mark.
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You are doing it wrong.
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From his build thread, he installed the cam gear ~90* off, which sounds right according to his issues.
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Originally Posted by curly
(Post 1210922)
From his build thread, he installed the cam gear ~90* off, which sounds right according to his issues.
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