Engine Valve Timing Interference - Confirmed NON-INTERFERENCE engine - Page 3 - Kia Forum
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#21 (permalink) Old 01-17-2010, 10:12 PM
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Originally Posted by pulsar86 View Post
If any engine can manage to get the valves to contact the piston without a valve actually snapping at the stem first then I would call it an interference engine. Next time someone has one of these engines pulled down with the timing belt off , do members a favor, please turn over the cam by hand while a piston is at the top of it's stroke so we will know once and for all if the valves touch the piston crown and the engine is interference type or not.
will do.

as for if this engine is non-interference or interference. i have posted proof FROM KIA, not some aftermarket parts information BS, that this is non-interference. as for bending valves at high rpms...i don't think luck has anything to do with my sephia not bending valves when i was revved to 6,000 rpms when my timing belt sheered 19 teeth off of the belt at the crankshaft. if you bend valves on a non-interference engine, there's obviously something else at play there and since i take care of my engine as do some of the others that have "gotten lucky" it forces me to question how well you really take care of your vehicle if you bent valves. things could be sticking causing valves to stick open or open farther than the cams push them open. you could have stuck HLAs, gunk in the valves guides, etc. if your engine is well maintained, you shouldn't have these problems. as for me, i beat the hell out of my engine, but i also take very good care of it. i wouldn't beat it like i do if i didn't take care of it and perform maintenance religiously on it.

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#22 (permalink) Old 01-17-2010, 10:53 PM
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KIAracer I agree that the engine is non interference based on your posts with the info supplied from KIA, I only suggested someone test it out next time they have one apart and report their findings to convince any doubters.

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#23 (permalink) Old 01-18-2010, 12:15 AM
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There has been a number of times on this site where there has been arguments and questions over whether the T8D engine in the sephias and spectras are interference or non-interference. i was asked, in the last argument, to prove that i was right on this subject and if i couldn't prove it then i basically didn't know what i was talking about. today i was browsing around on our GDS at the dealership on some info on a sportage i'm working on and i ran across an article in the tech times section from 2005 that basically proved me right. feel free to look it up for yourself and read it on kiatechinfo.com if you still need proof that this is direct from KMA/Kia Motors Corp.
The T8D engine was derived from a non-interference design licensed from Mazda (the F-series motor of the 626, I think) in the early-to-mid 1990's. Dates back to when Ford had a major stake in Kia (and Mazda too) and most Kia products were using Mazda drive trains of one sort or another. I would guess KMA would consider any pre-Hyundai derived technology to be the red-headed step children of the past.

Last edited by Ken99; 01-18-2010 at 12:19 AM.
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#24 (permalink) Old 01-19-2010, 09:52 PM
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If it makes a difference: while changing my timing belt, I rotated the camshafts completely while the belt was off. I thought for sure I bent a valve while doing this (I wasn't thinking when I did it). But I got it all back together, fired her up, and she purred like a kitten. So I'm assuming the valves did NOT touch the pistons. That, or rotating the cams by hand isn't forceful enough to bend a valve anyways...
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#25 (permalink) Old 01-21-2010, 09:28 PM
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KIAracer I agree that the engine is non interference based on your posts with the info supplied from KIA, I only suggested someone test it out next time they have one apart and report their findings to convince any doubters.
sorry, i wasn't posting that for you pulsar. i was posting it for a hard-headed member of this forum that shall remain nameless. but next time i have a head off of a T8D engine i will take some pictures of the valves fully open and post them if someone doesn't get to it before i do.

as for if an engine is interference or not, if you have the timing belt off and have one of the cams holding valves open, you can test this by carefully turning the crankshaft. if the piston hits the valves, it won't let you turn the crankshaft anymore until you close the valves. i can tell you from experience that ALL of kia's engines are interference engines except the ones mentioned in the pitstop article and earlier mazda based kia engines.

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#26 (permalink) Old 01-23-2010, 10:39 PM
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sorry, i wasn't posting that for you pulsar. i was posting it for a hard-headed member of this forum that shall remain nameless. but next time i have a head off of a T8D engine i will take some pictures of the valves fully open and post them if someone doesn't get to it before i do.

as for if an engine is interference or not, if you have the timing belt off and have one of the cams holding valves open, you can test this by carefully turning the crankshaft. if the piston hits the valves, it won't let you turn the crankshaft anymore until you close the valves. i can tell you from experience that ALL of kia's engines are interference engines except the ones mentioned in the pitstop article and earlier mazda based kia engines.
I may be hard headed, but my valves in my 2 (yes 2) sephias were not so hard. First sephia it happened to we installed a new belt. No good.
2nd sephia, hey maybe, (but I wasn't going to spend all the money again to find out the hard way again) so we assumed the worst and junked it.
Not to meantion my dads sephia, same thing, kia took her in, and claimed bent valves after the t-belt break.
Call berlin city (ONLY kia dealer here in vermont, in williston vermont, (look it up in the white pages or I can get you the number) and have a good talk with them for misinforming their customers. kia dealer to kia dealer, kia meachanic to kia mechanic. I just don't understand why 1 dealer says 1 thing, and another in another state say something different.
Hey there are d16 honda motors (yes interference) and do not bend/break anything with broken belts, but they are interference. Check it out, look at some honda forums. Its luck of the draw.

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#27 (permalink) Old 01-24-2010, 02:11 AM
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so i was "lucky" when both my sportage and my sephia broke timing belts, both on acceleration above 6,000 rpms as well as many others that have "gotten lucky" when their sephia or sportage didn't break valves. wow thanks for clearing that up for me. i suppose many rio owners with interference engines get lucky like this too? if they do then this forum wouldn't be littered with horror stories from rio owners that had the disappointment of having a mechanic find this and this because they were just driving along and the engine just cut off. personally i've never seen a sportage or sephia/spectra with bent valves after a timing belt break and we have them coming in all the time which leads me to believe that if you didn't inspect the valves yourself on those 3 sephias that you mentioned, then the shops you took them to probably fed you some BS to make money off of you. i've personally confirmed that this pitstop article from kia is true to it's word.

i really think that kia dealership you mentioned needs get with the program. just because they're the only dealer in the state, doesn't mean they can't be trying to hit a home run on every timing belt break that gets towed in. our dealership being in the vicinity of 4 other kia dealerships and countless independent shops, we don't have that luxury and actually have to compete with the other dealers in the area. and yes i'm saying that they probably didn't even look at your valves. they could have just went off of aftermarket "knowledge" and assumed the engine was an interference type because of what the timing belt manufacturers say.

not even sure why i'm STILL wasting time arguing with you about this because you're gonna believe what you want regardless of the information and proof i post on here. at least i did my part by posting proof FROM KIA that you requested at the beginning of this argument so that people can decide for themselves what is the correct information. and if you're going to try and challenge kia's information on their own engines that they built and designed versus what any non-kia information says, then you're an idiot.

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Last edited by kiaracer; 01-24-2010 at 02:29 AM.
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#28 (permalink) Old 01-24-2010, 08:36 AM
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so i was "lucky" when both my sportage and my sephia broke timing belts, both on acceleration above 6,000 rpms as well as many others that have "gotten lucky" when their sephia or sportage didn't break valves. wow thanks for clearing that up for me. i suppose many rio owners with interference engines get lucky like this too? if they do then this forum wouldn't be littered with horror stories from rio owners that had the disappointment of having a mechanic find this and this because they were just driving along and the engine just cut off. personally i've never seen a sportage or sephia/spectra with bent valves after a timing belt break and we have them coming in all the time which leads me to believe that if you didn't inspect the valves yourself on those 3 sephias that you mentioned, then the shops you took them to probably fed you some BS to make money off of you. i've personally confirmed that this pitstop article from kia is true to it's word.

i really think that kia dealership you mentioned needs get with the program. just because they're the only dealer in the state, doesn't mean they can't be trying to hit a home run on every timing belt break that gets towed in. our dealership being in the vicinity of 4 other kia dealerships and countless independent shops, we don't have that luxury and actually have to compete with the other dealers in the area. and yes i'm saying that they probably didn't even look at your valves. they could have just went off of aftermarket "knowledge" and assumed the engine was an interference type because of what the timing belt manufacturers say.

not even sure why i'm STILL wasting time arguing with you about this because you're gonna believe what you want regardless of the information and proof i post on here. at least i did my part by posting proof FROM KIA that you requested at the beginning of this argument so that people can decide for themselves what is the correct information. and if you're going to try and challenge kia's information on their own engines that they built and designed versus what any non-kia information says, then you're an idiot.
Apparrently you are one of those people that read something and don't comprehend it. I am not disputing our claims, I am simply putting out what has happened to me.
Did I say, kiaracer is lieing? No i did not. I said in my experience, it seems as though they are interference.

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#29 (permalink) Old 01-24-2010, 12:13 PM
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One of you (Kiaracer or 1fastkia) or both should pop for a copy of this article published by the Society of Automotive Engineers:

The Design and Development of the New Kia T8d Dohc Engine

May have the answers to the questions you are trying to resolve.
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#30 (permalink) Old 01-25-2010, 12:27 AM
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"seems as though they are interference"

well with my experience as well as many others, they have shown to be non-interference and kia backs that up. i shouldn't have to pay $16 to find out something i already know.

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