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Post by Zed. on Jun 3, 2019 22:41:31 GMT
for any help excuse the terrible iphone photi, battery was dead so no flash got the depth micrometer out & the chambers averaged 0.612" (15.54mm) deep between inlet & exhaust valves, this is measured off a cast surface so not accurate EDIT just looked at these photo's after posting, they're scheiße Rich.
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Post by V6 on Jun 4, 2019 10:02:44 GMT
Assuming the clearance is all fine... does this mean you will have higher compression than before? Therefore the car will have more power? I'm sure there are many more variables over my head. But this is the principle isn't it? So it could be a good thing... maybe?
ps
Lovely photos Zed
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Post by wannabe on Jun 4, 2019 10:13:58 GMT
lol, thanks Zed! I've not got a depth gauge thingy but I might be able to get my mechanic bloke to measure it - will have to drop him a line and report back!
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Post by V6 on Jun 4, 2019 11:03:43 GMT
I have a digitial and old school vernier caliper if you want to borrow it? I also have some accurate micrometers too.
Although you may be able to just use the thickness of a sheet of paper
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Post by wannabe on Jun 4, 2019 13:13:01 GMT
I have a digitial and old school vernier caliper if you want to borrow it? I also have some accurate micrometers too. Although you may be able to just use the thickness of a sheet of paper haha! I may have to take you up on that offer!
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Post by swordspork on Jun 7, 2019 19:29:13 GMT
It would be interesting to see what results you get from a compression test once the head is on.
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Post by wannabe on Jun 8, 2019 11:25:27 GMT
That occurred to me the other day - I will have to get it done! Well, assuming it runs, of course... lol re: Zed.'s suggestion of putting it together temporarily and timing it up with plasticine on top of the pistons to measure clearances / test for non-interference, would a simpler version be to just get piston(s) to TDC and then just rotate the camshafts to see what the clearance is at max lift? I'm thinking that would indicate if it is still a non-interference engine or not so be useful to know if I want to tweak timing! After that I could then do the timing test?
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Post by dadbif on Jun 8, 2019 21:23:41 GMT
I second turning the engine over with plasticine on the pistons, I used to do it but without a head gasket fitted, gave a bit more margin..
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Post by wannabe on Jun 10, 2019 19:59:30 GMT
got the depth micrometer out & the chambers averaged 0.612" (15.54mm) deep between inlet & exhaust valves, this is measured off a cast surface so not accurate Thanks for the measurements! I finally got the time to get the head on the kitchen worktop My shiny new Vernier calipers are telling me that with a metal ruler laid across the face of the block, the end of the calipers placed on it and the depth measuring tab extended into the deeper part of the dip between the intake and exhaust valves, just next to the sparkplug hole, I've got measurements of 15.65 to 16.2mm, but seemingly 15.8mm being about the midpoint. Take off the ~1.77mm width of the metal ruler and allow for my ineptitude with precision tools... and that gives, what, 13.88mm to 14.43mm chamber depth, but around 14.03mm assuming 15.8mm median value? The workshop manual I have says (page B-48) that head height/depth should be 133.8 to 134.0mm (5.268-5.276in), with max grind being 0.20mm (0.008in). So, after trying to get a measurement that was broadly repeatable and not massively different due to working freehand... ... I seemed to be getting head depth measurements of ~132.72mm (ish...). Allowing for margin of error, that's about a 1.1mm skim further than the lower OEM spec of 133.8? If 1mm = 39thou: www.convert-me.com/en/convert/length/?u=millimeter&v=1 and 1.1mm = 43thou: www.convert-me.com/en/convert/length/?u=millimeter&v=1.1... I'm confused, as I thought you could go further than 40thou skims if you really wanted... Although I guess that using the upper OEM figure of 134mm, that's a 1.3mm / 51thou skim? www.convert-me.com/en/convert/length/?u=millimeter&v=1.3I can't remember what I've read in terms of max skim without being an interference head - either 40thou or 50thou? - but either way, I think it's safe to say I better keep on top of the cambelt changes from now on... lol (Well, assuming it doesn't smash valves into little pieces upon first start up.) Next step is to wait for the bloody weather to clear up so that I can get busy putting it back together and doing the plasticine thing!
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Post by V6 on Jun 10, 2019 20:54:09 GMT
Lots of numbers! Very confusing. Just try the plasticine and be gentle 😁
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Post by Zed. on Jun 10, 2019 21:50:19 GMT
just build it & drive, Damn the torpedo's - full speed ahead Rich.
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Post by scottydugg on Jun 12, 2019 17:34:31 GMT
If you search mopar cylinder cleaner the stuff rev limiter used in his head gasket swap pops up. I'll get the link later. Was going to give it a shot
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