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[JamesV6CDX]

I appreciate not all of you may agree with this as the best way forwards, but it is the way that I'm choosing. I can confirm that a manifold stud has snapped on the drivers manifold, and as such, due to lack of access, the head needs to come off to get at it.

And there's no point in doing just one head, is there

I'm going for the full top end rebuild.

Tonight I stripped out bagpipes, plenum, inlet manifold, coolant bridge, EGR, sec air injection, I've stripped a lot down in just under 2 hours, until the dark and rain came!

There are lots of deposits in the valley, and to be honest it wasn't put together totally well... so I'm going for the rebuild option.

Feel totally confident doing this, second time round now.

I will update this thread with pictures and things that I encounter  

[JamesV6CDX]

At the same time, it will have new stat, new oil cooler, new HBV and a known good Rad from my 2.5

[JamesV6CDX]

And new water pump, cambelt kit, etc etc etc...

[ClarCE]

At the same time, it will have new stat, new oil cooler, new HBV and a known good Rad from my 2.5

All sounds good James, I'm envious!

I want to do my stat..

[jonny2112]

Good luck James, and please do keep us posted. Pics would be great too, as you never know what's round the next corner with an Omega

[Martin_1962]

So James what are the plans for....


Original 2.5
The LPG donor 2.0CD
The VGC 2.0GLS
The Elite

[JamesV6CDX]

So James what are the plans for....


Original 2.5
The LPG donor 2.0CD
The VGC 2.0GLS
The Elite

Original 2.5 - Rob for parts to sort out Elite, and scrap
LPG Donor 2.0CD is probably already crushed into the size of a shoebox
VGC 2.0GLS - Repair the gearbox
The Elite - Top end rebuild and MOT

Potentially sell the 2.0 when it's all finished, to pay for a brand new LPG kit on the Elite perhaps?

[Martin_1962]

If you fit the gas kit to the 2.0 you should be able to get high hundreds, possibly even a 4 figure sum with all the toys and the economy.

It struck me as a good runaround car and after what was spent would be criminal to scrap.

[Kevin Wood]

Hi James,

Before you put the 2.5 heads on, I would try to measure the volume of the combustion chambers. If you get a sheet of clear plastic and locate it over one of the combustion chambers, make a hole in the centre and then drip water into it (taking note of how much you use) until the combustion chamber is full the volume of water will tell you roughly the combustion chamber volume.

To this you can add an estimate of the volume taken by the head gasket (bore area x gasket thickness).

I'm not sure if the pistons are flat topped or pocketed on the V6 but if the latter, add a guesstimate of the volume of the pockets.

Plug the numbers into the formula here http://en.wikipedia.org/wiki/Compression_ratio and see what compression ratio you're looking at, using the 2.5 head combustion chamber info and the 3.0 bore and stroke.

In fact, by rearranging the formula and knowing the original compression ratio of the 2.5 you probably don't need to measure it!

Cheers,

Kevin

[Kevin Wood]

Quick back of a fag packet calc says you'll be running 12.6:1   This is assuming the pistons on the 3.0 are roughly the same as the 2.5 and don't contribute more to the combustion chamber volume.

It'll certainly be a super unleaded job!

Kevin

[Martin_1962]

No problem as he wants to LPG it and for running on gas stupid CRs work well

[Kevin Wood]

It'll be nice on LPG, with better power and economy than a standard engine, in theory. I don't know what it's going to be like on Petrol but hopefully the ECU's knock retard will prevent it killing itself.

Kevin

[Martin_1962]

Well with Tesco 99. Shell and BP stuff - try it out

[Auto Addict]

Well with Tesco 99. Shell and BP stuff - try it out

Thought Tesco only went upto 97?

[Marks DTM Calib]

Quick back of a fag packet calc says you'll be running 12.6:1   This is assuming the pistons on the 3.0 are roughly the same as the 2.5 and don't contribute more to the combustion chamber volume.

It'll certainly be a super unleaded job!

Kevin

I got 12.75:1...so pretty high.....its actualy direct injection territory!