Weird problem

[4G93NAPower]

on the last dyno 2 days ago , we manage to hit 195WHP on our track car but the car lost compression and the car need to be tow back to workshop , after dismantle the head we found this



what kind of problem can cause this damage to the cylinder head?

 

[jeffayn]

is this a half cut parts ?

 

[joe_mirage]

195whp?

wow .. that's monsta.

 

[ftzone]

thats a blown head gasket... change it to metal type and this should never occur again.

 

[4G93NAPower]

thats a blown head gasket... change it to metal type and this should never occur again.

well, usually blown head gasket won't damage the cylinder head like that

sigh , need to rebuild the engine again

 

[ftzone]

overheat can cause this problem too. ignition timing way off perhaps?

 

[jeffayn]

2 things can happened.

1 the cylinder is enlarge and the workmanship crap...because cylinder enlargement need very precise engineering work....

2 you buuy this halfcut from a dishonest seller...

3. you really need to know how to drive correctly not to blow your engine again ...hahaa

 

[4G93NAPower]

oh well, according to a friend which having same problem like mind , running too rich/lean(i forget which one @_@) will cause the head become like that

 

[slipar]

mmm..
from the pic the head gasket only blown..
not the head get blown..
just change to new gasket & ok..
no need to rebuild..
use metal head gasket better..

 

[jinkl]

looks more like someone sabotaged ur stuff , seems weird, there is another same head over here in my workshop in klang@meru , errr is it u ?

 

[peterfrancis]

Had a similar thing happen to my 4G93 head gsaket before, due to running waaay too (can't remember if too rich or too lean) for waaay too long. The pistons had even melted a bit and scratched the cylinder walls.

 

[jeffayn]

is it just the gasket ? from here look deeper

but if just the gasket, then is small matter nia....what i see is like till the wallside lio...

 

[kroolada]

well, usually blown head gasket won't damage the cylinder head like that

sigh , need to rebuild the engine again

i got 2-3 customer got problem like this. this happen when

1.) head gasket putus and still run the engine and make cylinder head to loose compression.
2.) check torque for cylinder head skru maybe not in spec
3.) need to see top of the block if got sign of compression leaking need to skim the block if not u will get the same problem again.
4.) for the cylinder head u can sent to machine shop for welding alloy and then need to skim.
5.) the metal gasket quality cannot support ur hi comp engine.
6.) i seen ur valve colour not same mean ur compression might not equal to each cylinder. ur a/f ratio will not get perfect each cylinder.

Bump:

oh well, according to a friend which having same problem like mind , running too rich/lean(i forget which one @_@) will cause the head become like that

it maybe too , look at ur spark plug colour. it look to lean bro.

i build and dyno many near 200hp 4G93 dont have problem like this if u got the correct spec like i mentioned above.

 

[4G93NAPower]

looks more like someone sabotaged ur stuff , seems weird, there is another same head over here in my workshop in klang@meru , errr is it u ?

uhm , nop

my workshop is in butterworth

@slipar
that was what i think after dismantle the head , just blown gasket
BUT after some inspection , the head become like that @_@.

 

[jinkl]

my mech made his conclusion , he said once ur head gasket blows, dont drive it around like that, water n air will keep sipping thru tht broken gasket part n slowly eat the head, head is aluminium only

 

[kroolada]

my mech made his conclusion , he said once ur head gasket blows, dont drive it around like that, water n air will keep sipping thru tht broken gasket part n slowly eat the head, head is aluminium only

from my experience the hot compression gas eat the cylinder head not water. the hot air flow through the broken gasket and make damage to the head. high water temp ( overheat ) cannot eat alloy head u need very hot air to make it happen.

 

[slipar]

my eye not so sharp to see the crack head..heheh..:rolleyes:
mm.. if water sipping through the crack might cos other problem right..
& is there any water line in between each piston..