Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   BP-4W Build? Thoughts? (https://www.miataturbo.net/engine-performance-56/bp-4w-build-thoughts-97584/)

psyber_0ptix 07-25-2018 04:59 PM


Originally Posted by Joe Perez (Post 1493288)
You are correct, I had them backwards. '99-'00 engines had the cam sensor at the front of the head readings bumps on the intake cam pulley, then it moved back to the middle of the intake cam for '01-'05, so that the ECU could determine the position of the VVT actuator.

So those are clearly both '01-'05 intake cams.

You can see the sensor tabs even more clearly in an earlier photo:

https://cimg4.ibsrv.net/gimg/www.mia...ba169a40de.png


The VVT cam triggers are in the back of the camshaft, not the middle.

https://www.autolinkmx5.com/ekmps/sh...;4]-7316-p.jpg

Also look at cam sensor placement on VVT vavle cover

http://cdn7.bigcommerce.com/s-dals72...426973.JPG?c=2

psyber_0ptix 07-25-2018 05:02 PM

I just caught up to the rest of the thread.....


.......goodbye

Joe Perez 07-25-2018 05:18 PM


Originally Posted by psyber_0ptix (Post 1493364)
The VVT cam triggers are in the back of the camshaft, not the middle.

God dammit, I can't even remember what my own engine looks like...

Everyone should just stop paying attention to things I write that aren't about food. And I have utterly no idea what car those cams are from any more.

codrus 07-25-2018 07:03 PM

The head is either a 94-97 (I forget code for this), or a 99-00 (BP4W). It's not a VVT head, because it doesn't have the VVT mechanism on the intake cam. It's not the 5A intake cam, because those say "5A" on them, and that one just says "BP.

Pretty sure that's a 99-00 (VICS) intake manifold in the background of the photo.

Can't see enough of the piston to ID it from dish/dome/taller dome.

VICS intakes don't fit on 94-97 heads because the ports are wrong. Putting the pieces together, it's probably a 99-00 motor.

So it depends on why it spun the bearing. If it did it because the thrust bearing failed and it machined the block, then everything that had pressurized oil in it is junk, and you've got a VICS manifold and a couple of used flywheels. If it did it for some other reason then it's possible the head is still good. Pop a couple of the cam caps off and see how the journals look underneath?

--Ian

MasMiata 07-25-2018 07:51 PM


Originally Posted by codrus (Post 1493382)
The head is either a 94-97 (I forget code for this), or a 99-00 (BP4W). It's not a VVT head, because it doesn't have the VVT mechanism on the intake cam. It's not the 5A intake cam, because those say "5A" on them, and that one just says "BP.

Pretty sure that's a 99-00 (VICS) intake manifold in the background of the photo.

Can't see enough of the piston to ID it from dish/dome/taller dome.

VICS intakes don't fit on 94-97 heads because the ports are wrong. Putting the pieces together, it's probably a 99-00 motor.

So it depends on why it spun the bearing. If it did it because the thrust bearing failed and it machined the block, then everything that had pressurized oil in it is junk, and you've got a VICS manifold and a couple of used flywheels. If it did it for some other reason then it's possible the head is still good. Pop a couple of the cam caps off and see how the journals look underneath?

--Ian

its a 4w head both cams are intake cams the journals don't look bad to me or shims. The intake does have vics. These are the thrust bearings. The pick up didn't look clogged. Maybe ran low on oil. Smelled burnt. https://cimg6.ibsrv.net/gimg/www.mia...fa8f8bcbd9.jpg
https://cimg9.ibsrv.net/gimg/www.mia...c991c28f62.jpg
https://cimg1.ibsrv.net/gimg/www.mia...9b3a7b525b.jpg
https://cimg3.ibsrv.net/gimg/www.mia...945ab6ce02.jpg
https://cimg9.ibsrv.net/gimg/www.mia...ef92f5cf07.jpg
https://cimg1.ibsrv.net/gimg/www.mia...8891c45f90.jpg
https://cimg2.ibsrv.net/gimg/www.mia...5ee37f2614.jpg


All times are GMT -4. The time now is 05:27 AM.


© 2024 MH Sub I, LLC dba Internet Brands