Bought a 99 head with bent valves. Input needed.
#21
It wasn't warped, there was a nick that extended into the combustion camber on #4 and out into the circumference where the HG seals. The plan is to do a stock rebuild with 99 head, msm intake cam, 01 pistons with arp main and head studs, with acl bearings. The cams will be degreed upon assembly to alleviate any miss- timing of the valvetrain/rotating assembly. It was prep'd for a MLS HG, the machinist that did the work does the machine work for all the local dealers, so I have no worries.
I will post a pic of the finish if you would like, but my camera isn't the best and I doubt it would have enough clairty to see that fine of detail.
I will post a pic of the finish if you would like, but my camera isn't the best and I doubt it would have enough clairty to see that fine of detail.
#22
Ok
Do your surface finishes look like this?
https://www.miataturbo.net/showthrea...818#post863818
https://www.miataturbo.net/engine-performance-56/how-deck-4-cylinder-engine-block-64577/
Do your surface finishes look like this?
https://www.miataturbo.net/showthrea...818#post863818
https://www.miataturbo.net/engine-performance-56/how-deck-4-cylinder-engine-block-64577/
#24
Your head has been belt surfaced..... Sorry I would not run a MLS gasket with that.
https://www.miataturbo.net/engine-performance-56/why-not-let-your-head-belt-surfaced-64394/
https://www.miataturbo.net/engine-performance-56/why-not-let-your-head-belt-surfaced-64394/
#29
I posted this for you
https://www.miataturbo.net/showthrea...191#post879191
Measure your head and see where you are.
https://www.miataturbo.net/showthrea...191#post879191
Measure your head and see where you are.
#30
Sorry for taking awhile to reply, my wife and I just got back in town the other day.
Looks like I'm back to square one,
Measurements are:
IF: 5.223
IR: 5.220
EF: 5.241
ER: 5.241
While I don't fully trust my calipers- they are a dial type, that was given to me by my grandfather and they don't always return to zero when you close them up. I did the best with what i have, zero'd them before each measurement and closed them afterward to ensure that "zero" was maintained. Also beforehand I measured a few feeler gauges to make sure they were still some what accurate. That being said I will NEVER use these for any sort of engine assembly- these measurements are way below the minimum thickness. The variation from Intake to exhaust side is supported by the "tabs" in the picture. They are the cast circles on the head that presumably tell you that you are stupid and machined the head to far. Notice that the one in the foreground of the picture has clearly been ground down while the one in the background still hasn't been machined at all.
Looks like I'm back to square one,
Measurements are:
IF: 5.223
IR: 5.220
EF: 5.241
ER: 5.241
While I don't fully trust my calipers- they are a dial type, that was given to me by my grandfather and they don't always return to zero when you close them up. I did the best with what i have, zero'd them before each measurement and closed them afterward to ensure that "zero" was maintained. Also beforehand I measured a few feeler gauges to make sure they were still some what accurate. That being said I will NEVER use these for any sort of engine assembly- these measurements are way below the minimum thickness. The variation from Intake to exhaust side is supported by the "tabs" in the picture. They are the cast circles on the head that presumably tell you that you are stupid and machined the head to far. Notice that the one in the foreground of the picture has clearly been ground down while the one in the background still hasn't been machined at all.
Last edited by Tyler01; 05-25-2012 at 10:45 PM.
#31
The tilt in the head is from the way the machinist applied pressure to the head when he had it on the belt surfacer.
The tabs you speak of are not milling stop points,that is a wives tail, they are injection points from where the aluminium pourd into the sand mold of the head.
On the dial calipers, blow som compressed air on the teeth, sounds like you have a piece of grit in there that causes them to skip, that is common.
You are correct about not using them for engine building, such as checking the crank, or other detail measurments. But they are great to use to let you know if you are in the ball park.
The tabs you speak of are not milling stop points,that is a wives tail, they are injection points from where the aluminium pourd into the sand mold of the head.
On the dial calipers, blow som compressed air on the teeth, sounds like you have a piece of grit in there that causes them to skip, that is common.
You are correct about not using them for engine building, such as checking the crank, or other detail measurments. But they are great to use to let you know if you are in the ball park.
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