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02-07-2008, 09:42 AM | #26 |
Death God
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Re: Head differences
i was under the impression only the 05 aviator 4.6 had the better 7/8 cooling passages.
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02-07-2008, 11:04 AM | #27 |
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Re: Head differences
There was never a head tick issue. Originally it was though to be a lifter tick and they had came up with the head fix by replacing the head however the actual noise is a result of collapse piston skirts on the piston its self. Due to excessive piston to wall clearance. The cylinder is actual cone shaped and the largest being at the top when the piston comes to the top of the cylinder the piston starts to rock back and forth when the cylinder fires rattling all the way down the cylinder.
Also the aviator head is different from the 03-04 head just for the record. And the fact that they were the only coolant improved head was a miss conception as well. As was the rumor of no production heads came with 9 thread
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02-07-2008, 04:05 PM | #28 |
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Re: Head differences
Aviator cylinder head part numbers cross reference with Cobra, Mach, and Marauder heads. They are all they same, rather they all benefitted from the same upgrades and refits at the same times.
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02-07-2008, 05:28 PM | #29 | |
Love my Mach
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Re: Head differences
Quote:
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02-07-2008, 07:50 PM | #30 |
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Re: Head differences
Well I have a 2004 and have not and will not ever use a cooling head modification. I have not seen the need for that modification yet. However it cant hurt to be safe
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Dan |
02-13-2008, 03:12 AM | #31 |
Living The Dream
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Re: Head differences
OK, I'm probably beating a dead horse here, but I have heard repeatedly that the 7/8 cooling issue caused valve guide galling and subsequently a ticking valve sound.
So, this is not the case then? That would mean if one doesn't already have "the tick", they will likely never experience it at all, since piston slap tends to be a tolerance issue from day 1?
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02-13-2008, 10:59 AM | #32 |
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Re: Head differences
if a skirt collapse you will hear it as a tick
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Dan |
02-13-2008, 08:12 PM | #33 |
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Re: Head differences
soo..people took their cars to ford with a "ticking" sound and ford replaced everyones heads. if it was a piston, it would still tick afterwards. seems like a lot of people would have said something about this by now.
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02-13-2008, 10:50 PM | #34 |
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Re: Head differences
uhm I worked for for as a master tech for over 9 years and yes that is what WE did because that is what ford wanted to do!!!!!! you would be suprized how much money they saved because a lot of the car fell out of warranty or blew up
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Dan |
02-14-2008, 01:47 AM | #35 | |
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Re: Head differences
Quote:
Haven't the vast majority of these cases been isolated to the rear driver's side area (7&8)? Wouldn't that still suggest a (cooling?) problem in this area? Also, it is my understanding that cylinders are honed straight, but that pistons are somewhat cone shaped (larger at the top) to accommodate heat expansion. Is this not the case? Has this been affecting all pistons/cylinders?
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02-14-2008, 09:15 AM | #36 | |
Death God
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Re: Head differences
Quote:
really? cuz there are a few hundred Cobra owners on SVTp that had their head replaced and have had no problems since.....
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02-14-2008, 09:32 AM | #37 |
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Re: Head differences
I don't understand how a head replacement (which cures the tick) stops a piston rattle problem. It seems to me if it were the pistons, then there would still be a tick even after the heads were replaced.
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02-20-2008, 01:42 AM | #38 |
Hoof Power
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Re: Head differences
I have March 03 built car. So I'm assumming I have the original 4 thread spark plug hole heads. I don't see any blue paint either head. Is the blue stripe obvious or is it hidden under the valve covers? Just one more thing to worry about as I prepare to put the car on the open track.
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02-20-2008, 02:23 AM | #39 | |
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Re: Head differences
Quote:
I borrowed this image from EPIKMACH, sorry I just needed a quick pic. Credit for the pic goes to him!
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02-21-2008, 02:39 AM | #40 |
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Re: Head differences
Blue Blurr32V thanks for the info. The next time I crawl under my car I'll take a look.
Mark
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02-21-2008, 02:56 PM | #41 |
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Re: Head differences
Yea ok I guess adding more cylinder pressure would not stabilize the piston either …. What ever
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02-21-2008, 03:07 PM | #42 | |
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Re: Head differences
Quote:
I do not claim to be correct and I am sure most people are not as knowledgeable as you appear to be on this subject, so with out adding more negative coments to your post, can you please dumb this down for me and explain this a little further? You mention that that Ford increased cylinder pressure to stop the piston clatter, how? Did Ford change the chamber size? I am not trying to be a smart ***, I just would like to know how things work.
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02-21-2008, 03:29 PM | #43 |
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Re: Head differences
I was able to stop the ticking by simply replacing the stock guides with bronze ones.
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02-21-2008, 03:58 PM | #44 |
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Re: Head differences
Look not trying to sound like an Richard but here are the facts!!!!!!
This is wrong!!!! Just to state the obvious here when you removed your heads and had bronze guides installed the machine shop also did a valve job to insure that the valve sealed after the new guides, when they tore in to the heads the also milled the bottom ( also known as the deck surface) in order to make it smooth enough for a MLS gasket to reseal when you mill a head you are making more cylinder pressured because the combustion part of the head is closer to the piston thus means less square area in turn adds more pressure to the piston thus stabilizing the piston to one side or the other (it Dampens to noise). The noise is actually still there it is just that you cant hear it due to added pressure. On a cobra it gets real bad because of the cylinder pressure they have due to the supercharger that is why it is more prone when idle and not under high boost. there is already enormous pressure on top of the piston so the clearance on a forced induction would have to be enormous for you to hear when the car is pullied and under pressure. That is why you hear it loudly when at idle due to less pressure
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02-21-2008, 04:08 PM | #45 |
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Re: Head differences
What you are saying makes sense. However, when the guides were changed, a valve job was done, the deck was milled, and the chambers were tampered with. The static presure remained roughly the same at about 190psi.
It would be interesting to do an experiment by simply changing the guides and seeing what that does. Jerome |
02-22-2008, 04:01 AM | #46 | |
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Re: Head differences
Quote:
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02-23-2008, 12:16 PM | #47 |
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Re: Head differences
So I just went downstairs and double checked and my 03 Mach heads have this same blue paint. So this means its a ford fixed head (different valve guides) and still 4 thread spark plug holes right.
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02-23-2008, 05:22 PM | #48 |
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Re: Head differences
Wondering this 2, my mach has a built date of 11/02.. but has the blue paint does this mean ford fixed the ticking noise on it and do i have the 4 thread or 9 thread spark plug holes?
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02-23-2008, 06:13 PM | #49 |
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Re: Head differences
According to Dan it means the heads have replacement guides and are 4 thread.
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02-23-2008, 09:59 PM | #50 |
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Re: Head differences
mine has april 03 build date,and blue on driverside head only.i have 30,000 klms on it and have no tick or cooling problems so am i just lucky/ or is problem yet to come
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