I apologize for the cross-posting (m.net) but it seems that collectively... not only do they not know anything, not a single one is willing to take a look at the parts in their garage. Kinda annoying.
I've got two VVT gears, from two different motors, and I want to put the "best" one on this new motor I'm building that I can.
The trouble is, they are fairly different inside, so I want to know which is the one I should use.
Both have number on the front face (the face with the cover which attached gear to camshaft):
But one has 2828 (on this the numbers are stamped, with very narrow line widths), where the other has 0802 2281 (these look like modern etching or laser etching, it's a very elegant, simple font).
From the quality of the markings, I feel the later is the newer model (which I'm assuming is improved), but the "2828" is a higher number than "2281" which makes me think perhaps that's newer. The plunger sits in entirely in the vaned part (stationary with respect to the cam) on 2828, but sits in the cam-gear-mount on 2281. The later plunger has two grooves in it and a stronger spring compared to 2828's single smaller groove.
Anyway, I'm at a loss. If anyone knows anything, please let me know. Several photos (click any for a larger version) at http://abefm.smugmug.com/Miata/Quest...Various-Years/
Does anyone have maybe a picture of the VVT mechanism, and know what year it's off of? That alone would be a big help.... I'll assume the later model is the improved one so all I want to see is what that front face looks like, to get a look at the numbers stamped on it!
In this thread: http://forum.miata.net/vb/showthread.php?p=5202824
there is what I assume to be an '02, which has the stamped markings.
This doesnt say the year of the car...
his user name is stock01 so there's a good chance that's the year of it.,
Since this is the very first year they made the part, my assumption is any weaknesses in design were exposed then. Of course, it doesn't have to be true, but it's my guess.
On a related note, does anyone have a broken vvt actuator? I need a single spring out of it, there are 8