baldy Posted July 25, 2006 Share Posted July 25, 2006 the head was skimmed on my supra back when the headgasket bailed out they took 11 tho off ( i can only hope this was the only time its been done) but whats the maximum it can be skimmed or is that onthe limit cheers baldy Quote Link to comment Share on other sites More sharing options...
Mike Posted July 25, 2006 Share Posted July 25, 2006 why did this post make me laugh.... a bloke called baldy asking about how skimmed a head can be... sorry mate... it doesn't take much.. Quote Link to comment Share on other sites More sharing options...
mr keef Posted July 25, 2006 Share Posted July 25, 2006 pmsl:d Quote Link to comment Share on other sites More sharing options...
wkdtime Posted July 25, 2006 Share Posted July 25, 2006 Mr T says around 5 Thou. and most will say up to 10 Thou will be fine, Ideally you want to avoid skimming the Head. Id consider getting a Thicker Headgasket as appose to the stock 1.0mm Toyota one, Maybe 1.2mm but this isnt vital. Quote Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2006 Share Posted July 25, 2006 I would have thought the place that skimmed the head would have been best able to tell you that, Si. As long as the skim doesn't intrude into the combustion chamber I suppose you would be alright, provided that you correct the compression ratio with a suitable thickness HG of course. Not ideal I know, but what else can you do when not replacing the head or spending ££££? Quote Link to comment Share on other sites More sharing options...
baldy Posted July 25, 2006 Author Share Posted July 25, 2006 hi jake head was skimmed though jps 2mm head gasket now fitted,all has been good for 2 years but something not right at the mo,im hoping its the thermostat sticking part open and not the head gasket again Quote Link to comment Share on other sites More sharing options...
baldy Posted July 25, 2006 Author Share Posted July 25, 2006 why did this post make me laugh.... a bloke called baldy asking about how skimmed a head can be... sorry mate... it doesn't take much.. no probs chap Quote Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2006 Share Posted July 25, 2006 hi jake head was skimmed though jps 2mm head gasket now fitted,all has been good for 2 years but something not right at the mo,im hoping its the thermostat sticking part open and not the head gasket againHi mate. Isn't 11 thou less than 0.3mm? Why such a thick HG? Quote Link to comment Share on other sites More sharing options...
LeeT Posted July 25, 2006 Share Posted July 25, 2006 Hi mate. Isn't 11 thou less than 0.3mm? Why such a thick HG? the stock one is 1.4mm isnt it? Quote Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2006 Share Posted July 25, 2006 1.2mm innit? Quote Link to comment Share on other sites More sharing options...
LeeT Posted July 25, 2006 Share Posted July 25, 2006 1.2mm innit? a quick search tells me 1.4mm so he hasn't really gone too oversized with the 2mm gasket. Quote Link to comment Share on other sites More sharing options...
Jake Posted July 25, 2006 Share Posted July 25, 2006 What did your search find? Who said 1.4mm? I really don't know the correct answer, but how come HKS sell 1.2mm, 1.6mm and 2.0mm HGs? I can't imagine there's a lot of demand for a thinner than stock HG. Quote Link to comment Share on other sites More sharing options...
LeeT Posted July 25, 2006 Share Posted July 25, 2006 What did your search find? Who said 1.4mm? I really don't know the correct answer, but how come HKS sell 1.2mm, 1.6mm and 2.0mm HGs? I can't imagine there's a lot of demand for a thinner than stock HG. i havent got a clue but more than 1 trader agreed that they were 1.4mm. I dont suppose HKS makes a 1.4mm gasket as they are no better than the oem stock one. Not really sure why anyone would want a thinner one either Quote Link to comment Share on other sites More sharing options...
LeeT Posted July 25, 2006 Share Posted July 25, 2006 have a read here http://mkivsupra.net/vbb/showthread.php?t=59086 Quote Link to comment Share on other sites More sharing options...
dandan Posted July 26, 2006 Share Posted July 26, 2006 HKS will sell a thinner one as it may be needed for certain engine builds. For one, people may be looking for higher CR - simple as that. Two, if the chambers (and/or the pistons) are modified and the head isn't skimmed enough to bring the CR back up then a thinner gasket will be needed to get back to the desired CR. I don't know what size stock is though - have heard 1.2 and 1.4mm. 0.011" is just over 0.279mm Quote Link to comment Share on other sites More sharing options...
bondango Posted July 26, 2006 Share Posted July 26, 2006 Standard Spec's for the 2jzgte (From Aria) http://specialists.supras-ireland.net/images/Aria2j.jpg Just a quick question, but when they fitted the Gasket, was the Block face machined or cleaned? MLHG's need a finish of RA30 or better on the mating surfaces, if not they dont seal properly. Marty Quote Link to comment Share on other sites More sharing options...
Digsy Posted July 26, 2006 Share Posted July 26, 2006 I could chew better than Ra 30 with my gran's false teeth. I think you mean Rmax. I've attached a surface finich spec for a Federal Mogul multi layer steel head gasket. I think if you took it to any run of the mill machine shop they would either: a) Laugh in your face. b) Say "yes, we can do that" and then just machine it as best they could to get you off their back. c) Invite you to go elsewhere. In any case, even if they could do it, you can't check for that kind of spec without specialist equipment, and how could you prove they had got it right or wrong? I think with aftermarket head skims you pays your money and takes your choice, but what you end up with won't be anywhere near as good as a stock finish. Better than a warped head, though. Quote Link to comment Share on other sites More sharing options...
bondango Posted July 26, 2006 Share Posted July 26, 2006 Yup Digsy i did mean Rmax. As you know, Every headgasket has a different spec, and it always worth investigating how well a machine shop can do the work before choosing which headgasket to run with... the most forgiving I have come across are the Cometic MLHG especially if used with Arps, then the HKS stopper types which have a coating like the other HKS gaskets but use a Stooper instead of a bead or grommet to help maintain surface seal. Choice of gasket is Defo something worth checking before getting work done IMHO Marty Quote Link to comment Share on other sites More sharing options...
baldy Posted July 26, 2006 Author Share Posted July 26, 2006 Hi mate. Isn't 11 thou less than 0.3mm? Why such a thick HG? leon felt it was needed because its running 1.45 bar on stock turbos please dont all start i know what your gona say (that was set by him when he traded from home in the old days,although he tried to say he would not have done so,but i have a reciept to prove this) its been running like this for years,so its stayin like it Quote Link to comment Share on other sites More sharing options...
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