AbeFM

iTrader: (3)

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.

----------------------------

Howdy everyone!

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):

BP6D
K6T90172

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.

http://forum.miata.net/vb/showthread.php?t=352812 This doesnt say the year of the car...

http://forum.miata.net/vb/showthread.php?t=218982 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

y8s

iTrader: (8)

can you tell if the variable range is the same?
my 01 is about 44 crank degrees total.

I've run into no issues advancing the **** out of my 01. I have not had it apart to read numbers sadly.

AbeFM

iTrader: (3)

****, bad link. Sorry:
http://abefm.smugmug.com/Miata/Quest...Various-Years/

Specifically:

The numbers are visible from the outside! With the car together. You may have a picture of this.


The travel looks very similar between the two. I don't know if it's exact, but perhaps next time I'm in there I'll try to find a way to determine this. It's a good point, though, if the later one has less range that pretty much makes my decision for me.

How much advance/retard do you run?

y8s

iTrader: (8)

visible from the outside of my cam cover and front plastic cover? not so much!

it almost looks like the center boss was added to make assembly easier (locating feature/bore) but who knows.

I run from full retard to 38 degrees advanced.

Also I made a little graphic that might be interesting to some. I am not certain of its absolute accuracy.

AbeFM

iTrader: (3)

Nice little graphic!

Um, turns out all the functional bits (those controlling advance and retard) are the same. It's merely differences in .. oil handling... which change. There's a plunger in there, and it has different numbers of grooves, sits in a different location, uses a different spring, etc. Otherwise, all else is interchangable.


"old"actuator


"new" actuator

and how it sits in there... upsidedown!


Housings stacked


Vane sections stacked.


The markings on the front, which lead me to believe that any pic with the plastic or valve cover off might show the actuator type to me.

chicksdigmiatas

iTrader: (11)

So necro... Instead of making a new thread, I have a question, Jason may know this too since in another search, he claimed to have pics of things. That little mini black hockey puck looking thing in the vvt soleniod, about 6mm across, and 2mm thick, where the f does that go. Mine was disassembled when I got it. I got everything else, but I can't figure where the little black disc thing goes. I think it goes in a recess in the front, but I don't know and aren't trying to chance it at this point. I am trying to piece my engine back together, and my wife has my cam in China. FTL. If anyone has taken on apart, let me know.

sobodah

Hello,

Is there pictures of the back of the actuators?

What VVT Actuators partnumbers are working well with MS3X?
(Partnumber visible on the front of VVT actuator: BP6D K6T90172 0908 228T and BP6D K6T90172 2328)

Thanks for the help,
Sérgio,

AbeFM

iTrader: (3)

To try to hit all your questions - I don't feel either actuator will be better or worse - if you're having an issue with MS, it's an issue with MS. It's pretty hardware independent.

In a (misguided) attempt to avoid such issues, I'm not running MS3, nor am I (yet) controlling my actuators. Ah, well.

All the pictures I have of the actuators are here - I've noticed nothing of interest on the back - perhaps tell me what you are looking for? Are you talking about the case or...?
-Abe.

sobodah

Hi Abe,

I am yet not sure of this, but the answer to your question may be that they are different VVT actuators for different markets (and slightly different engines).

I am running one of those actuators that is not working properly with MS3X. It's giving cam pulses in the 'wrong place'.
One of the difference between them is at the back (head side), they are different so they are running in different ranges. One has more advance than the other.

Abe, where did you get each of those actuators?

Can someone using MS3X with VVT engines look at the partnumber that is on the front of the VVT actuator that is working with the MS3X?

Thanks!
Sérgio,