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Westfield's & other 7's

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The Orange Westfield. It gets better as it goes on !!.

westfield seight westfield V8 westfield 3900
A rather "Stunning" Westfield 3.9. Efi in Stunning "Orange" (We really really like the color)
In this section you will see more details and pictures on the failings of the Stock Westfield injection system and how not only to cure it but to surpass engine efficiency such as you could never believe.

Some bad points first
westfield westfield westfield
The lower pulley is easily removed, but first you need to remove the Oil Cooler bracket. This is the underside of the plenum chamber, If this is how they leave the factory then it says little for there V8 Engine abilities
The power loss through the stock injection manifold can soon be replaced by using some Rpi Specialist components.
Westfield Project, Stage 3 Head Conversion and injection upgrade.
Powerplot With the plenum mods, re-chipped and stage 3 upgrade, This Westfield Seight is now producing a very healthy 220bhp with amazing Torque.

The project started, first the bonnet, had to be removed and the complete nose cone. Three bolts held the nose cone on, all the electric's we're disconnected (after battery disconnected), all coolant pipes removed, so front cone could be removed.
All ancilaries, we're next to be removed i.e. coolant/fuel/engine loom/ air intake, once this was done, parts of the engine we're removed, inlet manifold (complete), exhaust manifolds, these we're very difficult to remove, as the engine, was very tight in the bay, I was lucky enough, to have been blessed with small hands and managed to undo them. The brake reservoir, had to be loosened, so that I could get a socket extension, in on the rear exhaust manifold bolt, once this was done, the down pipes, were then taken off, so the manifolds, could be taken out for machining. These would be sent away, to be machined, to increase the gas flow, for the stage 3 heads. Next the rocker covers were taken off, the rocker shafts, push rods and cam followers. The push rods and rocker shafts kept together, in order, of there removal. Both the heads were then removed. The next stage, was the front timing cover, on the Westfield, an oil cooler, had been fitted. First this was removed and the bracket, holding the matrix, in order to get to the front crank, pulley bolt. The engine was locked and bolt removed, along with the pulley, the timing cover was then loosened, including the two studs, in the sump, however trying to remove the timing cover, in one lump, proved to be a problem. There was not enough room, to pull the timing cover, through the frame of the Westfield, so the water pump was removed. Just managed to get both parts out, the timing chain and pulleys, were then removed and also the camshaft. The engine was now ready to start, the stage 3 conversion .
westfield setup westfield setup
setting up the Air Mass Meter and Throttle Pot to the Correct values. So important when seeking the edge.

...and Finally

The new stage 3 heads, were fitted and torqued, to required spec, followed by the camshaft, followers, push rods and rocker shafts. The pre-loads on the followers, had to be adjusted, this was done by fitting different, sized shim, under the rocker shaft, mounts, until the required pre-load, was reached. The inlet manifold gasket, was fitted, followed by the inlet manifold, it self. New front timing gears and chain was then next, then the cover and water pump. The crank pulley was re-fitted, along with the alternator, oil cooler system and machined exhaust manifolds, as before this proved to be a major operation, getting the bolts back in. Next both the rocker covers were fitted and all the wiring, for the injectors, all the pipes, fuel and water. The nose cone was then offered back up, to connect, electric's and hoses to the radiator. The nose cone was then fixed back into place via the three bolts. Oil and water was, put into the engine and radiator, ready to fire up the engine, for the first time. The engine was turned over, until the oil pressure light had gone out and then she was started. She burst into a roar of thunder, this baby would go like a rocket. If it had wings, it would take off !

Below you can see some of the problems caused by Poor fueling The causes are from use of the Std Rover ECU Chip, bad port matching, bad intake (plenum) modifications, bad air filter arrangement and poor quality stock distributor, replacing these alone will give staggering returns, but going further to stage 3 will always provide the best results with no losses, not even to economy.
V8 Pistons westfield ports westfield timing chain westfield exhaust manifold
After only 2700 Miles these Pistons Show it all. This engine has a severe Over-fueling problem, and whats more, "Its not the only one" Blackened Exhaust Manifolds show previous Bad miss-match of ports. and below, our Stage 3 Heads Fitted & Ported The J+P Duplex Timing Chain Kit Is far superior to the Stock Rover Timing Gear and fitting is simple. The Exhaust Manifold Ports Have now been ported and Matched precisely to the Stage 3 Heads Prior to refitting.
.And now he (The Owner) has his Westfield back. ?

I must complain about the Westfield. So much for me taking it easy on the way home from you last week, I enjoyed it so much I nearly 'did an off' at a roundabout when I misjudged the speed and subsequently very nearly spun the car when pulling away! Seriously though, it has made quite a difference. I notice little difference until about 3000 rpm, at which point, the car comes alive, all the way around to just under 6000 rpm, it makes a totally new noise and really kicks me in the back! Considering I never really revved it over 5000 before, it seemed to run out of steam at this point, it is really quite impressive. It is just so much more responsive. Le mans... fantastic, we hit 140mph on the way down and the car got there and back without a hiccup, 700 miles on a freshly rebuilt engine, I was impressed! These engines are completely wasted in your Range Rovers! For info, when I got the car back home from Norwich (approx 100 miles) it leaked a few drops of antifreeze overnight. When we got to Dover, a bit of oil was flecking out from the side of the bonnet, I think I have a slight leak on the oil filter remote housing. I kept an eye on the levels (no problem) and I'll sort the leaks out in the coming days. As it wasn't a problem, I didn't want to fiddle with it in the middle of France, its a 'nose off' job, and those bolts are not the most convenient! So, when can you develop a carbon fibre plenum chamber? The thing I'm not sure about is just how many injected Westfields there are out there... hardly a figure you could get from the factory! Certainly, at the 'local club' all the Westies are four cylinders. Either way, if you develop one, I'll happily stick an advert in the Club magazine and post an entry on the club 'newsgroup'. Finally, give me a shout if you get some cheap 4.6 engines in! This must be the next step... I'll be making this a winter project I think... yes actually do it myself!
Thanks, Graham.

Visit our Westfield "Picture Gallery" (Click here)

 The following information and chart are another Westfield, seight, and this one has not gone all the way with head and cam upgrades but you will see the improvements from standard are still very real
Another 3.9 Efi Westfield shows the gains that are so easily available
The genuine results.
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