Head Gasket for a skimmed head

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swordspork
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Posts: 204

Head Gasket for a skimmed head Jan 6, 2021 14:15:23 GMT

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Post by swordspork on Jan 6, 2021 14:15:23 GMT

Hi, I have recently purchased a head that has been quite heavily skimmed, I am slowly gathering parts to swap the head onto my Mk1 1.6. I'd like to know what peoples experience with this is. Will the Mazda item be up to the task? or is it worth looking at something like a cometic head gasket?

I have done a bit of reading and it is suggested that the genuine head gasket is 0.040" thick and the cometic head comes in a variety of thicknesses. (What isn't clear is if these figures are when compressed or not).

At roughly 3 times the price of the genuine item I can't really see what the advantages are, but will it offer better longevity? The cometic head gasket is multi layer steel whereas the maruha website stated the mazda head gasket is made of asbestos.

Many thanks swordspork

wannabe Needs To Get A Life Posts: 3,185	Head Gasket for a skimmed head Jan 6, 2021 14:19:19 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by wannabe on Jan 6, 2021 14:19:19 GMT My head is skimmed to the point that another skim will have the valves below the block face, lol. OEM head gasket has been fine so far!

JamesMk3 Chats A Lot Posts: 331	Head Gasket for a skimmed head Jan 6, 2021 15:33:57 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by JamesMk3 on Jan 6, 2021 15:33:57 GMT Jan 6, 2021 14:19:19 GMT wannabe said: My head is skimmed to the point that another skim will have the valves below the block face, lol. OEM head gasket has been fine so far! Dished pistons?

Zed.
Needs To Get A Life

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Posts: 2,883

Head Gasket for a skimmed head Jan 6, 2021 16:02:34 GMT

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Post by Zed. on Jan 6, 2021 16:02:34 GMT

the B6t turbocharged engine in the Mazda323 used a conventional 'graphite' type hg, so should be good enugh

^^ plenty of fi 1.6 Mx5's live long with the standard / graphite type hg?

if you need a hg with larger 'fire-rings' to suit a large overbore then go comtec etc. but if you dont.......

amusingly, Mazda specc'd a steel / laminate hg for the 1.8 engine but this may have been down to cost? (possibly cheaper in bulk??)

Rich.

50 Shades of Silver. '91 NA6CE.

mighty5s.com/thread/2681/50-shades-silver-na-eunos

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Zed.
Needs To Get A Life

Smeg!

Posts: 2,883

Head Gasket for a skimmed head Jan 6, 2021 16:04:23 GMT

Quote

Post by Zed. on Jan 6, 2021 16:04:23 GMT

Jan 6, 2021 15:33:57 GMT JamesMk3 said:

Jan 6, 2021 14:19:19 GMT wannabe said:

My head is skimmed to the point that another skim will have the valves below the block face, lol.

OEM head gasket has been fine so far!

Dished pistons?

theres valve relief's in the pistons already, only realy need deepening if you skim loads OR have BIG camshafts

Rich.

50 Shades of Silver. '91 NA6CE.

mighty5s.com/thread/2681/50-shades-silver-na-eunos

C20XE, 5.38:1 & 3J Lsd, Ohlins, stupidity etc.

wannabe Needs To Get A Life Posts: 3,185	Head Gasket for a skimmed head Jan 6, 2021 18:20:36 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by wannabe on Jan 6, 2021 18:20:36 GMT I thought I'd uploaded a picture but I can't find it! The slightly dished cut-outs (IIRC?) round the valve seats are a whisker away from being totally gone now so another skim and I don't think the valves will seal! lol
	Last Edit: Jan 6, 2021 18:20:54 GMT by wannabe

swordspork Chats A Bit Posts: 204	Head Gasket for a skimmed head Jan 6, 2021 19:35:30 GMT via Tapatalk wannabe, howardb66, and 1 more like this Quote Select Post Deselect Post Link to Post Back to Top Post by swordspork on Jan 6, 2021 19:35:30 GMT Mine is back from the machine shop. That dented my wallet. It is now clean as a whistle. I'll take some pictures and put them on my thread.

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