Omega Owners Forum - Off with its head (s)!!!

HerefordElite Omega Knight Offline Welcome to the Shire Posts: 1747 Hereford Gender: Drives: A6 Avant 2.5tdi Quattro Sport	Re: Off with its head (s)!!! Reply #15 - 05. Mar 2009 at 21:25 TheBoy wrote on 05. Mar 2009 at 21:23: HerefordElite wrote on 05. Mar 2009 at 21:21: what have you removed from behind heads / top of gearbox it looks bare? only coolant and breather pipes. remember no dis on 2.6 ah that's what's missing
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Marks DTM Calib

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Re: Off with its head (s)!!!
Reply #16 - 05. Mar 2009 at 21:25

VXL V6 wrote on 05. Mar 2009 at 21:24:

Real stupid question here but does the block sit level in the car? I only ask because I notice there is coolant at the back of the reservoir area where the oil cooler sits but not uniformly across the whole of it?

Or has all the kit you have removed from the engine lessened the weight of the front of the car?

Its lowered the weight quite a bit!

So the suspension is sitting a bit higher and teh drive slopes away from the house as well

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« Last Edit: 05. Mar 2009 at 21:26 by Marks DTM Calib »

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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Off with its head (s)!!! Reply #17 - 05. Mar 2009 at 21:27 Marks DTM Calib wrote on 05. Mar 2009 at 21:25: Wouldn't be a DIS in that shot anyway, its attacehd to the head! Good point, well presented Marks DTM Calib wrote on 05. Mar 2009 at 21:25: The engine bay will get a bit of spit and polish whilst its stripped down to! That I don't doubt
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Matchless Omega Knight Offline Posts: 1746 Nottingham Gender: Drives: The one at the end of the drive	Re: Off with its head (s)!!! Reply #18 - 05. Mar 2009 at 21:28 Have you got a new crank seal yet?
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Kevin Wood

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Re: Off with its head (s)!!!
Reply #19 - 06. Mar 2009 at 00:04

Here's one for you: What path does coolant flow take around these engines? Can't quite get my head around it from those photos.

I can see that the flow from the transfer pipe goes into the rear of the oil cooler area, and down into the water jacket around the bores, by the look of it. Presumably it finds its' way to the water pump, and into the thermostat area but how are the heads cooled? Surely all the head cooling water doesn't flow up from the water jackets and through the coolant bridge and heater circuit, does it? Or is that a separate channel feeding the front of the head from the water pump?

Kevin

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chrisgixer Omega King Offline Black ones are faster. Posts: 14570 Wokingham Gender: Drives: "Omega Black" 3.2 Elite. Thanks to Joshwyatt.	Re: Off with its head (s)!!! Reply #20 - 06. Mar 2009 at 02:48 had presumed, in through the top of the stat chamber(seperate to cooler chamber) out through the hole under stat, down to the water pump which pushes it round the jacket and up into the oil cooler chamber, then out the back of the block???
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Marks DTM Calib

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Re: Off with its head (s)!!!
Reply #21 - 06. Mar 2009 at 08:08

Kevin Wood wrote on 06. Mar 2009 at 00:04:

Here's one for you: What path does coolant flow take around these engines? Can't quite get my head around it from those photos.

I can see that the flow from the transfer pipe goes into the rear of the oil cooler area, and down into the water jacket around the bores, by the look of it. Presumably it finds its' way to the water pump, and into the thermostat area but how are the heads cooled? Surely all the head cooling water doesn't flow up from the water jackets and through the coolant bridge and heater circuit, does it? Or is that a separate channel feeding the front of the head from the water pump?

Kevin

I will see if I can draw a diagram up

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markey mark BANNED Offline banned for repeatedly reneaging on deals. Posts: 1 scunthorpe north lincs Gender: Drives: 99 mv6 est leather & 19"s	Re: Off with its head (s)!!! Reply #22 - 06. Mar 2009 at 13:38 i have just rebuilt mine mark with facelift manifolds ported the heads on exhaust side put 4 g cams in junked the egr and sec air inj system heads were refurbed skimmed all new inlet valves new valve seals all valves re lapped runs sweet and does have a lot more go in it !
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Re: Off with its head (s)!!!
Reply #23 - 06. Mar 2009 at 13:42

markey mark wrote on 06. Mar 2009 at 13:38:

i have just rebuilt mine mark with facelift manifolds ported the heads on exhaust side put 4 g cams in junked the egr and sec air inj system heads were refurbed skimmed all new inlet valves new valve seals all valves re lapped runs sweet and does have a lot more go in it ! Thumbs Up!

Yup, the 4G cams on the exhaust wont deliver anything sadly as they offer only improved duration and that does not aid the exhaust side of things (its pumped and the gases exit quickly due to the valve actualy opening towards the bottom of the firing stroke)

The ports on the later manifolds are much bigger and if you junk the air injection you can really open the head out.....the manifolds are SO much better to!

The more I look at the later setup the more it would appear that the emission changes were lowering the output power so they HAD to work on the ancillaries to get the output back up in order to be a viable replacement for the 2.5 and 3.0

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Re: Off with its head (s)!!!
Reply #24 - 06. Mar 2009 at 13:44

Marks DTM Calib wrote on 06. Mar 2009 at 13:42:

markey mark wrote on 06. Mar 2009 at 13:38:

i have just rebuilt mine mark with facelift manifolds ported the heads on exhaust side put 4 g cams in junked the egr and sec air inj system heads were refurbed skimmed all new inlet valves new valve seals all valves re lapped runs sweet and does have a lot more go in it ! Thumbs Up!

Yup, the 4G cams on the exhaust wont deliver anything sadly as they offer only improved duration and that does not aid the exhaust side of things (its pumped and the gases exit quickly due to the valve actualy opening towards the bottom of the firing stroke)

The ports on the later manifolds are much bigger and if you junk the air injection you can really open the head out.....the manifolds are SO much better to!

The more I look at the later setup the more it would appear that the emission changes were lowering the output power so they HAD to work on the ancillaries to get the output back up in order to be a viable replacement for the 2.5 and 3.0

surely if the valves are open longer the scavenging effect will be higher on the exhaust side ?? the facelift manifolds are way bigger must have took 2/3mm of the ports and flattened the ridge in middle Thumbs Up!

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Martin Imber Over Active Poster Offline LPG Omega V6 - Keyfobs Rebuilt Posts: 20110 Worcester Gender: Drives: 2001 Omega 2.6CD LPG & 3.0 cams	Re: Off with its head (s)!!! Reply #25 - 06. Mar 2009 at 14:00 Could do with a list of where to grind as I might port mine while they are off
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markey mark BANNED Offline banned for repeatedly reneaging on deals. Posts: 1 scunthorpe north lincs Gender: Drives: 99 mv6 est leather & 19"s	Re: Off with its head (s)!!! Reply #26 - 06. Mar 2009 at 14:20 Martin Imber wrote on 06. Mar 2009 at 14:00: Could do with a list of where to grind as I might port mine while they are off just open them out to the gaskets martin
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Andy B Over Active Poster Offline Posts: 21988 Bury Lancs Gender: Drives: 1999 3.0 Elite auto/TDM	Re: Off with its head (s)!!! Reply #27 - 06. Mar 2009 at 14:42 So we all need a DBW inlet manifold to ~~butcher~~ modify with a Dremel/die grinder to get a few more horses out of our earlier cars!
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markey mark BANNED Offline banned for repeatedly reneaging on deals. Posts: 1 scunthorpe north lincs Gender: Drives: 99 mv6 est leather & 19"s	Re: Off with its head (s)!!! Reply #28 - 06. Mar 2009 at 15:06 Andy B wrote on 06. Mar 2009 at 14:42: So we all need a DBW inlet manifold to ~~butcher~~ modify with a Dremel/die grinder to get a few more horses out of our earlier cars! no andy dbw exh manifolds
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Marks DTM Calib

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Re: Off with its head (s)!!!
Reply #29 - 06. Mar 2009 at 15:11

markey mark wrote on 06. Mar 2009 at 13:44:

Marks DTM Calib wrote on 06. Mar 2009 at 13:42:

markey mark wrote on 06. Mar 2009 at 13:38:

i have just rebuilt mine mark with facelift manifolds ported the heads on exhaust side put 4 g cams in junked the egr and sec air inj system heads were refurbed skimmed all new inlet valves new valve seals all valves re lapped runs sweet and does have a lot more go in it ! Thumbs Up!

Yup, the 4G cams on the exhaust wont deliver anything sadly as they offer only improved duration and that does not aid the exhaust side of things (its pumped and the gases exit quickly due to the valve actualy opening towards the bottom of the firing stroke)

The ports on the later manifolds are much bigger and if you junk the air injection you can really open the head out.....the manifolds are SO much better to!

The more I look at the later setup the more it would appear that the emission changes were lowering the output power so they HAD to work on the ancillaries to get the output back up in order to be a viable replacement for the 2.5 and 3.0

surely if the valves are open longer the scavenging effect will be higher on the exhaust side ?? the facelift manifolds are way bigger must have took 2/3mm of the ports and flattened the ridge in middle Thumbs Up!

Should have worded it better, the cams open and close the valve at the same points but, the period spent at the higher lift valve is longer on a G cam.

Scavenging is more related to the point of opening than the lift.

Hence buggering with the cam timing can yield some gains (vernier cam sprockets needed to do this as you need to adjust exhaust cam with respect to inlet).

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