Whats Darts Acceptable Warpage

[rbrduck71]

trying again i guess dart ironeagle 180/49cc heads after all my problems mention in other threads, i have 15-20 hrs on heads, checked block deck it was straight/true so was one head, the other head was .004 or less warped, didnt have smaller than .005 feeler gauges, theres more info on heads background on other threads wrote by me, hope that was the right way to word that

should i expect heads to be alright out of brand new box? should i check my future heads from dart out before i use them? am i wrong to assume brand new heads from dart will be good? economy sucks we are all broke, please educate me so i wont lose more money.

THANKS FOR ALL AND ANY HELP

rubberduck

[Trmnatr]

trying again i guess dart ironeagle 180/49cc heads after all my problems mention in other threads, i have 15-20 hrs on heads, checked block deck it was straight/true so was one head, the other head was .004 or less warped, didnt have smaller than .005 feeler gauges, theres more info on heads background on other threads wrote by me, hope that was the right way to word that

should i expect heads to be alright out of brand new box? should i check my future heads from dart out before i use them? am i wrong to assume brand new heads from dart will be good? economy sucks we are all broke, please educate me so i wont lose more money.

THANKS FOR ALL AND ANY HELP

rubberduck

send a PM to DartVader or call the tech line and ask for RICK

[Awesome Bill]

Your not having head gasket problems! Your oiling problem would not have anything to do with a head gasket sealing ring keep water or oil out of the combusiton chamber. Any area that will allow oil into the combustion chamber is where you want to look. Rings if put in upside down, will not cause that either. CHECK ALL THE VALVE GUIDES for wear. Bet you will find something. You can use the valve and rock it back and forth with slight pressure. Should not move very much.

[rbrduck71]

after all my problems one of you guys suggested i wasnt checking everything out as i went, for example i didnt check my valvetrain geometry out on assembly, now at present took heads off to figure out were oil is coming from.
based on what i have learned here im checking everything, having hard time knowing what forum to ask what. dart vader already let me know i was doing that wrong,
so im asking about the head warpage on another post/thread/forum, (dont know the difference)

man it seems like i cant win for losing

yes head gaskets were not failing, discovered warpage later, i want to avoid more problems caused by me not asking IS 4-5 THOUSANDS OF AN INCH ACCEPTABLE, please pardon my ignorance, ive learned alot here and want to keep learning, it almost feels like its duck season.

THANKS FOR THE HELP!!!! need all i can get

rubberduck

[rbrduck71]

will check guides the way youve instructed as soon as they get back from shop

thanks again

rubberduck

[rbrduck71]

thanks for the name trmnatr, i will call rick after i get heads back

rubberduck

[BIG CHIEF]

Rbrduck71,

I did some research on your concern and came up with these specs:

Dart's acceptable machining tolerance will be .004 max, not to exceed .002 in 6". These tolerances are very low compared to the factory GM specs. Please let me know if you have any other questions.

Thanks, BC

[rbrduck71]

hey big chief THANKS, what does not to exceed .002 in 6" mean? im not understanding the 6 inch part

THANKS AGAIN FOR THE HELP!!!

rubberduck

[Dart Vader]

Basically, the tolerance is .004 overall, but it is not to exceed .002 along any given 6 inch segment of the head's length.

[rbrduck71]

hey thanks dartvader, if i understand correctly the warp in head should not be longer than 6" long if it is greater than .002
my buddy is delivering heads on friday hopefully with oil problem diagnosed, i will get back to you guys then, i didnt know what to look for when i straight edged heads so i will do it again

THANKS AGAIN FOR THE HELP GUYS!!!!

rubberduck

[Dart Vader]

hey thanks dartvader, if i understand correctly the warp in head should not be longer than 6" long if it is greater than .002
my buddy is delivering heads on friday hopefully with oil problem diagnosed, i will get back to you guys then, i didnt know what to look for when i straight edged heads so i will do it again

THANKS AGAIN FOR THE HELP GUYS!!!!
rubberduck

Not exactly. .004 warpage over a length of say, 8 inches is not very much... well below GM specs as Big Chief pointed out.
But .004 of warpage over 4 inches is a little more significant, even though it's still under GM spec (I'm pretty sure), we prefer to go on the safe side for tolerances.

So to sum up, any 6 inch length you measure should be under .002, any greater length you measure should be under .004.

Hope that clears things up a little.

[rbrduck71]

wow this place is a bucket of knowledge, never thought that there was that many ways to look at it, cant wait to get them back so i can check that the RIGHT WAY!

THANKS FOR THE HELP!!!

rubberduck

[rbrduck71]

ok here we go first off if you are STRAIGHT EDGING YOUR HEADS make sure you get final measurement with the right tools, i checked my heads, only had feeler gauges down to .005, used light to show gap between head and edge, the gap looks huge with light, couldnt get .005 in the gap so i ASS U ME D that it was .003-.004

I WAS WRONG!!!! the biggest feeler gauge i could get in the gap was .0015 and only a feeler gauge wide, not inches!

MAKE SURE YOU GET REAL MEASUREMENTS BEFORE PRESENTING PRODUCT PROBLEMS

thanks for your patience with my ignorance

dumb duck

[Dart Vader]

Glad to hear they were well within spec!

Don't beat yourself up over mis-measuring, if you walk away from the message boards with a little extra knowledge, they have served their purpose.

Let us know if you have anymore questions.