Register Log In

Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Recessed Valves in Duratec?

Print Thread

Recessed Valves in Duratec? #617419 04/28/03 09:12 PM
Joined: Oct 2002 Posts: 365 D Drumbo_dup1 OP CEG\'er
OP Drumbo_dup1 CEG\'er D Joined: Oct 2002 Posts: 365	The archives had some discussion/speculation on this topic, but the definitive link I found (http://contour.org/forums/Forum1/HTML/006121.html) apparently has expired. At that time, Big Jim said it's his understanding the Duratec is an "Interfearence" Engine. Unless that was an inside joke that went over my head, I assume that should have read "Interference" Engine. Whatever -- given the big-buck consequences of up to 24 hammered valves due to catastrophic timing chain failure, "InterFEARence" probably is more appropriate. So, does the Duratec NOT have recessed valves? Will the valves get hammered if the timing chain(s) fails? If so, what is the recommended mileage for timing-chain/tensioner replacement? My '98 EO has 52.5K on the clock and was converted to Amsoil 100% synth when I got it at 17K.

Re: Recessed Valves in Duratec? #617420 04/29/03 03:22 AM
Joined: Sep 2000 Posts: 9,602 KC, MO D DemonSVT_dup1 Hard-core CEG'er
DemonSVT_dup1 Hard-core CEG'er D Joined: Sep 2000 Posts: 9,602 KC, MO	Interference by the name means that the valves and the pistons occupy the same space. It's just the timing that makes it so they do not hit. So yes "technically" if the chains ever failed there would be a mess. (No "known/for certain" chain failures to date though!) I would not worry about the chains. If you are in the 150-200k range on the stock engine I might start thinking about them. 2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.

Re: Recessed Valves in Duratec? #617421 04/29/03 09:02 AM
Joined: Dec 2000 Posts: 1,960 Proud to live in America M MarkO_dup1 Hard-core CEG'er
MarkO_dup1 Hard-core CEG'er M Joined: Dec 2000 Posts: 1,960 Proud to live in America	Correct me if I'm wrong but non-interference engines have spaces or shaping in the top of the piston to accomodate the valves in the event of a catastrophic fail. Bless our servicemen & women overseas. L.Cpl Ian Malone, 1st Battalion Irish Guards, R.I.P.

Re: Recessed Valves in Duratec? #617422 04/29/03 07:02 PM
Joined: Sep 2000 Posts: 9,602 KC, MO D DemonSVT_dup1 Hard-core CEG'er
DemonSVT_dup1 Hard-core CEG'er D Joined: Sep 2000 Posts: 9,602 KC, MO	Originally posted by MarkO: Correct me if I'm wrong but non-interference engines have spaces or shaping in the top of the piston to accomodate the valves in the event of a catastrophic fail. You are wrong to use that as a point of reference. The valve reliefs cut into the pistons are only done on engines that require it so the 2 parts do not meet while moving. It still can be an interference or non-interference engine. For instance the 3L Duratec has valve reliefs cut in the pistons due to the close tolerances and it's an interference engine. 2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.

Re: Recessed Valves in Duratec? #617423 04/29/03 10:28 PM
Joined: Oct 2002 Posts: 365 D Drumbo_dup1 OP CEG\'er
OP Drumbo_dup1 CEG\'er D Joined: Oct 2002 Posts: 365	Originally posted by DemonSVT: Interference by the name means that the valves and the pistons occupy the same space. It's just the timing that makes it so they do not hit. So yes "technically" if the chains ever failed there would be a mess. (No "known/for certain" chain failures to date though!) I would not worry about the chains. If you are in the 150-200k range on the stock engine I might start thinking about them. Hope to not be above 150K for quite some time. Thanks, Demon.

Re: Recessed Valves in Duratec? #617424 04/30/03 08:53 AM
Joined: Dec 2000 Posts: 1,960 Proud to live in America M MarkO_dup1 Hard-core CEG'er
MarkO_dup1 Hard-core CEG'er M Joined: Dec 2000 Posts: 1,960 Proud to live in America	Originally posted by DemonSVT: Originally posted by MarkO: Correct me if I'm wrong but non-interference engines have spaces or shaping in the top of the piston to accomodate the valves in the event of a catastrophic fail. You are wrong to use that as a point of reference. The valve reliefs cut into the pistons are only done on engines that require it so the 2 parts do not meet while moving. It still can be an interference or non-interference engine. For instance the 3L Duratec has valve reliefs cut in the pistons due to the close tolerances and it's an interference engine. I stand corrected !! Bless our servicemen & women overseas. L.Cpl Ian Malone, 1st Battalion Irish Guards, R.I.P.

Moderated by GTO Pete, Lance Kinley_dup1, Ray_dup1

Link Copied to Clipboard

Powered by UBB.threads™ PHP Forum Software 7.7.5