Mazda 1.8l Head tear down-Tech Info
20 Attachment(s)
Mazda 1.8l Head tear down-Tech Info
The basic views Front https://www.miataturbo.net/attachmen...ine=1335229407 Rear https://www.miataturbo.net/attachmen...ine=1335229407 Notice the casting number in the middle to right corner of the casting. BP4W 2-1 AREA dose not have this head casting listed for in it’s head and block book, but it still may be listed in the CD rom. Intake side https://www.miataturbo.net/attachmen...ine=1335229407 Exhaust side https://www.miataturbo.net/attachmen...ine=1335229407 Top view https://www.miataturbo.net/attachmen...ine=1335229407 Combustion chamber https://www.miataturbo.net/attachmen...ine=1335229407 Head thickness Measured from VC rail to head gasket surface is Between 5.270 and 5.272 at four corner points around the head. Intake valve head measured 1.300 https://www.miataturbo.net/attachmen...ine=1335229407 Exhaust valve head measured 1.103 https://www.miataturbo.net/attachmen...ine=1335229407 The valves were slipped back into the head, and valve tip height was checked. Intake range 1.792 – 1.799 Exhaust range 1.791 – 1.798 https://www.miataturbo.net/attachmen...ine=1335229407 Next I checked spring installed height on one Intake valve Measured 1.565 w/out spring seat shim installed Spring seat shim measures .020 thick Now to figure out what my seat pressure is. 1.565 - .020 = 1.545 +/- .004 Now setting up the spring tester to 1.545 https://www.miataturbo.net/attachmen...ine=1335229407 Most springs were 35-37 lbs @ 1.545 A low was 33 lbs and a high of 39 lbs Spring specs. 1.027 OD 1.800 free length Looking at my SBI Catalog (2007) Pg 545 Block 12 1.8l 16v “BP” Spring part number 160-1250 (90-97) SBI spring spec (Pg 760) 1.831 Free length 46 lbs @ 1.600 But due to the difference in years and no listing for the 99/00 head I am working with. These springs, are asking for taller installed heights from what I measured by .055 Looking at the supertech springs they as for a much shorter installed height. http://supertechperformance.com/cata...ection=ivalves SPRK-MM16D1 56 lbs @ 34.2mm /1.346 That is the loan single spring they list. It makes me what to think there is miss listings in both SBI and Supertech. .200 is a lot of shims to be used and no good way to locate it with out the use of special thick spring seats. |
Sooo much good happening.
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Would be even better using MACRO mode in the camera, with ISO set to 800, and a steady hand!
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FYI this is stock 99 head
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Looks like Michael J Fox took the pics
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Originally Posted by BogusSVO
(Post 868903)
.200 is a lot of shims to be used and no good way to locate it with out the use of special thick spring seats.
https://www.miataturbo.net/engine-performance-56/st-ti-retainers-dont-fit-springs-chromoly-options-64087/#7 |
Originally Posted by NiklasFalk
(Post 869040)
ST do use thick extra spring seats.
https://www.miataturbo.net/showthread.php?t=64087#7 |
Noob question. So I removed the head and was careful to mark the cam caps. Then I was looking at the head (rotated it) and my lifters fell out, but I did not record from where? Are they specific to each lifter bore because of differing shim size? I would assume they are?
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Originally Posted by Landrew
(Post 876418)
Noob question. So I removed the head and was careful to mark the cam caps. Then I was looking at the head (rotated it) and my lifters fell out, but I did not record from where? Are they specific to each lifter bore because of differing shim size? I would assume they are?
You have some work ahead of you if you want to puzzle together the same valve lash as before without getting any new shims. |
i love all of these threads, but lol everytime I see the photos. Keep up the good work. I think the information is great for this site.
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Haha we need a BogusSVO section of the forum.. just for posting detailed bonerrific pics.
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BOGUS!
I SWEAR TO THE FSM THAT IF I EVER FIND OUT WHERE YOU LIVE, I'M GOING TO MAIL YOU A NEW CAMERA!!!! But thanks for the thread, I appreciate the Miata specific stuff :bigtu: |
bogus takes pics the way i take videos: :(
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