4.6 dohc interference?
10-28-2006, 08:37 PM
#11
6th Gear Member
Join Date: Feb 2006
Location: Virginia
Posts: 11,786
RE: 4.6 dohc interference?
ORIGINAL: BraMas
Mike I hate you because you do know what 4G63 is
I guess it's gonna take alittle time to get all the Rice out of your blood. We'll keep working on ya.
Vega like stated above Timing CHAIN breaks are rare. So nothing you need to worry about.
Mike I hate you because you do know what 4G63 is
I guess it's gonna take alittle time to get all the Rice out of your blood. We'll keep working on ya.
ORIGINAL: sxynerd
I Like you for knowing what a 4G63 is!!!!
91 GSX 12's mostly stock!!
Mike
I Like you for knowing what a 4G63 is!!!!
91 GSX 12's mostly stock!!
Mike
...But it's a 12 second novelty!
Mike
10-28-2006, 09:11 PM
#12
3rd Gear Member
Join Date: May 2006
Location:
Posts: 831
RE: 4.6 dohc interference?
ORIGINAL: vega
4.6 romeo? is that all the 4.6 dohc motors? or one out of a car that i never heard of????????
well here, to make it easier or less difficutl to understand- lets focus on the specific 4.6 dohc- this is the one that i found and am getting-
1993-1998 Lincoln Mark VIII, 280 hp (209 kW) and 285 ft·lbf (386 N·m) THAT ONE-
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1. so is only the lsc the HO motor?
2. is this specific motor an interfierence motor?
3. if so what is the pistons compression at? is it very high? like 10:5.1? how low would i have to lower the compression on the pistons to make it not an interference motor?
4. i know the 03' - 04' forged pistons are 8:5.1 compressionm, is there a fairy inexepensive or good deal out htere with this kidnof setup for forged pistons out there links please.
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you guys ever here of koenisegg btw? on a side topic.
4.6 romeo? is that all the 4.6 dohc motors? or one out of a car that i never heard of????????
well here, to make it easier or less difficutl to understand- lets focus on the specific 4.6 dohc- this is the one that i found and am getting-
1993-1998 Lincoln Mark VIII, 280 hp (209 kW) and 285 ft·lbf (386 N·m) THAT ONE-
---------------
1. so is only the lsc the HO motor?
2. is this specific motor an interfierence motor?
3. if so what is the pistons compression at? is it very high? like 10:5.1? how low would i have to lower the compression on the pistons to make it not an interference motor?
4. i know the 03' - 04' forged pistons are 8:5.1 compressionm, is there a fairy inexepensive or good deal out htere with this kidnof setup for forged pistons out there links please.
-----------
you guys ever here of koenisegg btw? on a side topic.
Without trying to sound rude,
http://www.google.com/
is the link you need.
10-28-2006, 11:46 PM
#13
Thread Starter
Join Date: Aug 2005
Posts: 29
RE: 4.6 dohc interference?
thanx - so the chains on these are that hard t break huh? lets say i am puting 800hp to the wheels of a rwd vehicle. still not many problems?
and lastly then- this one i could not find on google btw- i don't know why but i thought i could not find the others on google but ended up doing so- sorry about that-
which harness for the dohc 4,6 has an eprom (or if you know this instead- a 24 bit chip) so i cna just program it to tune it that way rather than using a piggy back (btw i am refering to build a turbo 4.6) or a complete custom new harness. check out pgmfi.org - i would be using a moates setup.
and lastly then- this one i could not find on google btw- i don't know why but i thought i could not find the others on google but ended up doing so- sorry about that-
which harness for the dohc 4,6 has an eprom (or if you know this instead- a 24 bit chip) so i cna just program it to tune it that way rather than using a piggy back (btw i am refering to build a turbo 4.6) or a complete custom new harness. check out pgmfi.org - i would be using a moates setup.
10-29-2006, 12:01 AM
#14
5th Gear Member
Join Date: Jul 2005
Location: Georgia
Posts: 2,387
RE: 4.6 dohc interference?
There are several 4.6 cars with 800 rwhp (not on this site!) and I've never read anything about chains breaking on any 4.6 - ever. I read most every post on this site and have never heard of a timing chain acting up or breaking. Ford actually seems to have a good design on this one.
10-29-2006, 12:08 AM
#15
Thread Starter
Join Date: Aug 2005
Posts: 29
RE: 4.6 dohc interference?
here is another thing i am slightly confused about according to this article all dohc 4.6 an dohc 5.4 had forged pistons and not forged rods...
http://www.mustangandfords.com/techa...ap/index2.html
"The 4.6 and 5.4 DOHC engines run domed forged pistons for increased compression in the four-valve chamber. Ford opted for forged pistons to withstand the pressure extremes associated with this high-performance engine. Like the hypereutectic pistons in the SOHC, these pistons also employ Teflon-coated skirts for reduced friction and heat protection. The ring package is virtually the same."
i htought it was only the 03-04' sc stangs that had forged pistons.
http://www.mustangandfords.com/techa...ap/index2.html
"The 4.6 and 5.4 DOHC engines run domed forged pistons for increased compression in the four-valve chamber. Ford opted for forged pistons to withstand the pressure extremes associated with this high-performance engine. Like the hypereutectic pistons in the SOHC, these pistons also employ Teflon-coated skirts for reduced friction and heat protection. The ring package is virtually the same."
i htought it was only the 03-04' sc stangs that had forged pistons.
10-29-2006, 09:23 PM
#18
3rd Gear Member
Join Date: Feb 2006
Location: Muskegon, MI
Posts: 538
RE: 4.6 dohc interference?
Romeo piston is a press-fit-type hypereutectic with a dished crown.
10-29-2006, 09:24 PM
#19
5th Gear Member
Join Date: Aug 2005
Location: Whitehall, Michigan
Posts: 2,638
RE: 4.6 dohc interference?
ORIGINAL: FastLane034
They are just hypereutectic, not forged. The only pistons to be forged are in the supercharged motors, with the exception being the 5.4L Cobra R motor (2000 only). The DOHC motors (Mach 1's and Cobras) all have forged crankshafts... the only exception to this is the Mach 1 with an AUTOMATIC transmission... the 5-speeds still have a forged crank, the autos have a cast crank. The pistons have never been the weak point, the crankshaft has never really been the weak point either... the biggest problem for the mod motor is the connecting rods, if Ford did forged pistons and connecting rods, and kept a cast crank, we could probably expect to see a "safe rating" of 550-600 HP instead of the 450 that the powdered metal rods have. The supercharged motors are also the only ones to have forged connecting rods, really, the powdered metal connecting rods are the weak link.
Romeo piston is a press-fit-type hypereutectic with a dished crown.