What year did Jaguar go to the bigger oil pump on the V12? Was it the same time they changed the rear seal?

 

With the 6 litre engine.

 

Pretty sure it was pre 6.0 I know sometime in the 80’s they changed the oiling system around for Germany. Instead of bypassed oil going to the oil cooler, oil went into the cooler unless it was bypassed.

 

The full flow oil cooling system was introduced in about 1988 on all V12 XJSs. I understand that previously only the German market got it. The pump remained unchanged. My own opinion is that the bypass system is just as good. Mine takes 20 degrees C out of the oil as it goes across the cooler and the hottest oil temp i have ever recorded on the cam covers is 88 C. Even in very hot weather with hard use.
Racing is different, of course, but the main problem with racing the V12 is oil pickup. It was only in the several hours long ETCC races that cooling became a problem.

 

The real problem in racing* is oil surge. When oil heats up it gets thin-thinner than water and nearly every attempt I’ve seen to deal with it, baffles, swinging pickups, pressurized remote supplemental oil tanks ( accusump) actually delay not solve the issue.
That’s why in 1954 Jaguar went to dry sump systems. I had to try every other solution myself before I gave in and converted my race car to dry sump.
The problem is with the big bearings and 12 cylinders the aftermarket pumps aren’t big enough. Oh, they do a fine job of scavenging oil but much above 6500 rpm the pressure side runs out of oil. Since the bigger pump was introduced I figure the factory figured that out from Germans on the Autobahn. Hence my belief the oil pump got bigger sometime in the late 1980’s but before the 6.0.

* You need to understand the G forces involved to appreciate why street driving will never replicate racing.

 

OK, digging around, as I was confused.

The V12 has only had ONE oil pump

EBC3163, from Carby to the LAST of the X300 6ltr cars.

There was a TSB about the actual drive dog on very early V12's, and replacement sorted that very early is the time frame.

What the track mobs did, NO idea, never got into that area.

 

The left is oldest type

 

 

MG how many TRACK guys are on this site , for that matter how many V12 Jaguar engines are being used for racing TODAY??????
ron

 

There are still a number of racers using the V12. But you’re right most guys on this site are just polishers. In fact most car sites are just polishers. Very few racers left.

 

I'm not a racing driver. But I try to build the V12 as a racing . Unfortunately, there is very little time for this. I polished the runners valves but not the sofa.
Sofa is for beer or sex or something else.

 

Try your car on a track day. It doesn’t need any special racing gear, just has to be in safe operating condition. While you will need a helmet they usually have them to rent. It’s many times safer than public roads and you can’t get a ticket.
You drive as slow or fast as you feel comfortable. They will teach you the rules like the requirement to wave faster cars by ( no, you should never pull over just point to which side you’d like them to pass) They usually have teachers to help you learn the track and how to gain speed without straining your car.
All the other drivers are going the same direction, sober, alert, paying attention, and focused. Since you’ll be on street tires you don’t have to worry about oil surge. Most track days fully 1/3 of all drivers have never raced. It’s not about winning or losing. It’s about finding out if you like the fun of racing enough to want to do it.
The track itself is many times safer than public roads with plenty of room for mistakes. There are corner workers to warn you about track conditions they have flags to tell you at a glance if oil is spilled or there is an incident ahead or someone wants to pass you. If something should happen there are experts to help you and doctors standing by.

 

There are three race tracks around Moscow only and the closest one to me is 40 miles. A track day, or rather 15 laps, costs 250. Once a year I can go for a ride.

 

Enjoy it. You will I’m sure. Please tell me about it.