overheated engine question?

949949 Senior Wagonist
in Engine & Drivetrain
if the d16 overheated, will only the heads be warped or will the whole engine be warped ?

to clearify

heads = where the valves and springs sit in
whole engine = bottom section (includes where the piston can crank sit) and heads

if its the whole engine then thats understandable.

if the answer is just the heads are going to be warped,
my next question is why doesnt the whole engine get warped?

Comments

  • evol911evol911 familEE
    The head has more surface area where it meets the block so it retains more heat and cools differently thus warping. If you think about it the block doesn't have too much at the top end of it, and the sleeves keep it straight(er) on the top part of the cylinders. Not saying a block can't warp and usually if the head warps you will some slight warp in the block but the block can range from very minimal (in service standards) or enough to ruin your day.
  • NZ-DB8RNZ-DB8R Moderator
    As above basically.

    I did work experience at an engine rebuilders, over a year I only saw one case of a warped block, but that was from a 1970's holden (GM to you guys I guess)

    Most of the time the head can be surfaced and will be all good, will even have a slighty higher compression ratio
  • 949949 Senior Wagonist
    thanks.

    what did you use as a straight edge to see what the clearance was for the block and head?

    i am also being suggested to get cometic as my next headgasket, becuase i can get custom thickness vs. eom honda headgaskets.

    any pros and cons with getting custom from cometic.
    (im thinking of a little thicker then oem)
  • Eagle BeagleEagle Beagle familEE
    "heads" has to coop combustion for that extra heat
    "whole engine" if needed can be resurfaced too...without the chisel...

    "gaskets" composit versus metal

    clearance versus tolerance ...

    :mrgreen:
    a little thicker then oem
    =that little less compression
  • 949949 Senior Wagonist
    thanks eagle.

    then which one do you think would be best for my application?

    since i am able to easily re surface the heads, the engine bottom is not soo easy. so i would like to try to avoid taking out the engine. so which head gasket should i get to help cover up the bottom end not being resurfaced. ( i have not checked it yet. i do know for sure the heads is warped for sure tho, not so much the bottom end.
  • skinnyskinny Senior Wagonist
    well are you wanting stock compression or do you want a slightly higher? and I mean higher by .02-.1. I would resurface it and slap two head gaskets in. GM's have done that for years do drop there c/r.
  • evol911evol911 familEE
    They have a spray that will help seal the head/head gasket/block surfaces. Its not going to fill deep scrapes but it will aid in the headgasket sealing right. Cometic is good as long as you are not using the headgasket to lower your compression for a turbo motor wherein pistons should be used for that. The thicker the headgasket, the greater the chance to have a blowout between cylinders. Also be aware that if the head is warped enough where you have to take quite abit of material off, your timing will be off also. I don't quite remember but I think it is something like 1 degree every .01in taken off.


    DO NOT STACK TWO HEADGASKETS ON TOP OF EACH OTHER!!
  • skinnyskinny Senior Wagonist
    If its warped or even if its not and you pulled it off, slap a Z6 head on it if your going turbo. Round combustion chambers. Y8 for all motor, square combustion chambers. If it were me and I pulled the head I would yank the slugs and rods, Hone, new rings, new rod bearings, and a cometic, felpro, mr gasket. IMO if you have the head off you have 80% done.
  • Eagle BeagleEagle Beagle familEE
    so which head gasket should i get to help cover up the bottom end
    take a wild guess, in this case yours is as good as any person on the world ...
    then you can wait and see ...
  • 949949 Senior Wagonist
    evol911 wrote:
    They have a spray that will help seal the head/head gasket/block surfaces. Its not going to fill deep scrapes but it will aid in the headgasket sealing right. Cometic is good as long as you are not using the headgasket to lower your compression for a turbo motor wherein pistons should be used for that. The thicker the headgasket, the greater the chance to have a blowout between cylinders. Also be aware that if the head is warped enough where you have to take quite abit of material off, your timing will be off also. I don't quite remember but I think it is something like 1 degree every .01in taken off.


    DO NOT STACK TWO HEADGASKETS ON TOP OF EACH OTHER!!


    i have never heard of the spray. do you have a brand and a link to a site where i can read up on it more?
  • lucskywalkerlucskywalker Wagonist
    949 wrote:
    evol911 wrote:
    They have a spray that will help seal the head/head gasket/block surfaces. Its not going to fill deep scrapes but it will aid in the headgasket sealing right. Cometic is good as long as you are not using the headgasket to lower your compression for a turbo motor wherein pistons should be used for that. The thicker the headgasket, the greater the chance to have a blowout between cylinders. Also be aware that if the head is warped enough where you have to take quite abit of material off, your timing will be off also. I don't quite remember but I think it is something like 1 degree every .01in taken off.


    DO NOT STACK TWO HEADGASKETS ON TOP OF EACH OTHER!!


    i have never heard of the spray. do you have a brand and a link to a site where i can read up on it more?

    permatex- copper sray, most parts stores will have it. i always use it, every time for the head gasket, also is good for the header/manifold to block gaskets. 8)
  • evol911evol911 familEE
    lucskywalker wrote:
    949 wrote:
    i have never heard of the spray. do you have a brand and a link to a site where i can read up on it more?

    permatex- copper sray, most parts stores will have it. i always use it, every time for the head gasket, also is good for the header/manifold to block gaskets. 8)

    Yep thats the stuff! There is also some other stuff that isn't copper, I'm not sure who makes it but it works just as good. The copper helps distribute the heat.
    Here is a pic of the copper stuff:
    http://www.carshopinc.com/popup_image.php/pID/42287?osCsid=5b2702073b59935b3547b8f593f54df2
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