Not only "blowing out the carbon' but getting the motor and other systems up to proper operating temperature. keeping it hot enough to burn off carbon deposits on the plugs, piston, and gunk on the valve stems. Runs enough fuel through the system to allow the cleaning compounds to work as designed. Also gets the oil hot enough for moisture to evaporate properly. Even heating up the brakes through use will help keep moisture out of the brake system, especially drum brakes.That is why smaller engines that have to work harder to provide adequate performance often last longer than large motors in cars operated on short trips in town. Think little old lady driving to church once a week. That's why lots of cars with high mileage from commuting still run well. The best thing you can do for your car is drive it.

 

Or a drive up Sarcee or Shaganappi Trail does the trick too. No shortage of hills in Calgary.

 

Not only the V12, but also the 6 in line.

 

Yes but have to watch out for those ****ing camera trucks. Those *******s. Almost worth the money for the speed-trap reflective licence plate screen.

 

I drive sometimes in Germany, a lot of highways no speed limits.

 

Thanks. Yes, I suspected similar, and try to cane it up the odd hill, but there aren't many that are both straight enough and traffic-free enough to make it safe. I can find some if I go further out into the rural areas, however.
The other question is, how long does it need to be kept at high revs? Even on the more rural hills, I can seldom manage more than a dozen or so seconds at full boost before I start to run out of road. I've seen some people say it needs to be sustained for at least a few minutes, while others say a quick burst is fine.

 

Agreed.

Get into it Alex, but watch out in the UK. If you wind it up too far for too long, you might run out of country and end up in the drink, HA.

All mine were driven hard, NOT stupid, but hard.

Long distances are the best, as in hour after hour at 3000rpm or more, really cleans the innards.

100% agree also, with the importance to get it UP to temp before any "clean out" is attempted.

 

3,000 rpm? That's lower than I was expecting. I think I could manage that even here.
Road trip, here I come... when it's cooler.

 

It is reality as I get older, oops, and the Gendarmes get smarter. So I sit at that rpm, and when needed, its gets the red line blast, usually passing a road train or 2.

After a while in the city/burbs, it takes a 100km or so to "feel" settled, so then it just gets better.

Same goes for the current S Type V6's.

 

Hi Grant

Still 'Buzzing' about finding those elusive Fuel Pipe Clips!

But when I'm on those Country Roads, I've somehow taken to using 2nd gear, where the rpm is at around 3000 and overall after that She seems to run much better, although of course She drinks a lot more 5 Star

Where I can almost hear her say, 'don't mind if I do but you better make mine a double'

The only downside being, that I'm getting paranoid about one of those Fan Blades flying off

Do you happen to know if there was ever an option to fit an XJS with a steel fan?

 

Maybe the early pre HEs? But OEM cream-coloured fans, as per the HE OEM ones from a construction and solidity angle, are available still, but in a slightly larger diameter as used in some saloons and the Daimler limo. Black Country Jaguar have them. I fitted one to a mate's car, which entails removing and discarding the shroud. It needed a 20mm spacer and longer studs being made, but cools the engine incredibly effectively. The normal clutch unit fits fine. Of course, a resourceful guy like you OB could cut down the blades and keep the shroud!

 

Use first gear rather than second !

Cheers
DD

 

Jaguar used steel fans until 1981-82 or so. On the XJS I think the change to plastic was shortly before the introduction of the HE engine.

Anyhow there's no guarantee against breakage with the steel fans. Check this out:

Welcome to Jag-lovers - Members Photo Viewing Page

Cheers
DD

 

Right !

They're not made out of glass

Cheers
DD

 

Ans they can also get wet, as they aren't made of sugar...

 

Oh dear!

Maybe plastic would leave a smaller dent?

 

Like this you mean?



Facelift Fan cut down to fit inside Pre-Facelift Fan Shroud



Fan with Spacer fitted

 

Cruising along in OD is not effective in "blowing" out the carbon. figured that out in my long departed 88 Ford Tbird.


Even my Jeep gets a "work out" from time to time by using D2!! Same for the LT1 powered Jaguar.

Gotta get the r's up. 3K minimum....

Carl

 

Terrific OB. Just like that. Much nicer than that horrible flimsy black effort now being sold.

 

Another big reason commuter cars with high mileage run well is that the mileage is relative. Starting your car creates as much wear as 1,000 highway miles, because there is no oil at startup. On the highway the engine has a constant film of oil to protect it, which is why a 3 year old car with 200,000 miles is not at all the same as a 15 year old car with 200,000 miles.