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Sorry, but the shim does create more space in the combustion chamber. By my calculations a little more that a 10th of a cubic inch. I'm just not sure how to calculate what the compression ratio will be by adding the additional space in the squash area. Diesel engines are very touchy about this. Below 16:1 they wont even run.Sorry, but the shim does create more space in the combustion chamber. By my calculations a little more that a 10th of a cubic inch. I'm just not sure how to calculate what the compression ratio will be by adding the additional space in the squash area. Diesel engines are very touchy about this. Below 16:1 they wont even run.
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what are you measuring it is not clear at all,
post a photo of what it is pointing too it.
valve lash?
head warp (not over 0.001" per foot end to end crosswise, head and deck
no year engine told.
all engines made, the service manual is chock-a-block full of engine tolerance checks. we can't guess any of the100 checks.
my 2nd guess the shop want s top mill the head flat? not why asking>???
and wants to know max allowed,?
will ask toyota that.
many engines over milled head will ping like mad and self destruct.
due to insane new compression ratios.
retension the head studs
if you did not clean out the stud holes before fitting the head it is very possible that the oil/water gunk in the holes is locking the bolt and achieving tension setting without achieving the proper tension on the gasket so after a period of use the gasket fails
run a compression test first
another point is when rebuilding an engine it is always advisable to have the head skimmed to ensure that it is not warped
when tensioning down a head you must follow the tightening sequence so that the gasket is compressed evenly
if you covered all these points then look for ignition timing ( close to tdc or after tdc)or air fuel ratio problems as late timing or a lean mixture will overheat
No, cats don't smoke. Heads do. Were the heads milled flat? Does the smoke have a blueish color to it? If you didn't have the heads checked or milled. Then this could be the problem. Heads are checked for flatness, and ground, valve guides, are knurled, and the valve seals are replaced at any machine shop.
No This is a failed head gasket between two adjacent cylinders and is cause by loose head studs or warped head. The fix is to pull the head have the head milled flat again-clean out the stud holes using a thread tap and after fitting a new gasket (ensuring all the holes line up) re-tension the head studs properly.. Permanent reliable job..
Doubling up on head gaskets will reduce the compression ratio, so yes it can cause power loss, although it shouldn't be a lot. a head gasket is kinda thin.
No, she got the engine hot enough to blow out the head gasket. The cylinder head will also have to be checked for cracks and warping by a shop. Aluminum heads will warp if too hot, and have to be milled straight again if possible-the mating surface must be perfectly straight for the head gasket to seal. A new head might work, but if it got super hot, I would be concerned about the crankshaft bearings getting scorched.
The 175psi is not high for cylinder compression (I believe I interpreted it correctly). Two adjacent cylinders with low compression almost always means the head gasket has blown the fire ring between the cylinders. Pull the head, have it checked and or milled. New head gasket set, timing belt, oil change and get her going.
To get a higher compression ratio you can do one of three things.Get domed pistons with valve recesses,mill the block or the easiest mill the head.Take a few thousandths off the head at a REPUTABLE machine shop and bolt it up but make damn good and sure your valves will clear the pistons while at TDC (Top Dead Center) before you mill that head and check after it's milled with the head torqued down,otherwise you'll do all that work only to destroy ALL of the valves AND pistons!Boring it out will ONLY add to your displacement ie. CID/CC/L maybe from 2.2 to 2.3 or so depending on wether or not you go .030 or .060 over if it will handle it.Then larger pistons and rings to match.That will help with the HP pluss mill the head to get 10:1 compression and run 93 octance and she'll purr nicely.Throw in a header,a good exhaust,highflow cat and muffler,knock off the AC compressor,cold air intake and she'll be top notch.Don't know if they make roller rockers for these or not.It really all depends on how far you want to go with it.Hope it helped and good luck boss!!!
Sorry, but the shim does create more space in the combustion chamber. By my calculations a little more that a 10th of a cubic inch. I'm just not sure how to calculate what the compression ratio will be by adding the additional space in the squash area. Diesel engines are very touchy about this. Below 16:1 they wont even run.
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