Mazda 1.8l Head tear down-Tech Info
10 Attachment(s)
Mazda 1.8l Head tear down-Tech Info
The basic views Front Attachment 4562 Rear Attachment 4563 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 Attachment 4564 Exhaust side Attachment 4565 Top view Attachment 4566 Combustion chamber Attachment 4567 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 Attachment 4568 Exhaust valve head measured 1.103 Attachment 4569 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 Attachment 4570 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 Attachment 4571 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. Catalog - SuperTechPerformance.com 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. |
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