Jaguar Could Return To Inline-Six Engines | car News @ Top Speed

Am a big fan of this direction, if they decide to take it.
This could be a good way to extend the new 4cyl Ingenium engines produced in-house into an innovative inline 6 that provides high torque and efficiency.

 

A possible power plant for the sedans, but I don't think it can be squeezed into the F-Type.

 

If they do build an I6 then how long before we see a V12? Something for the big sedans or a future XK perhaps?

 

Quite possibly.

 

With the alloys available these days it's possible to shrink a LOT. Honda, Toyota and Ford have released slim engine blocks that are really small, so it's totally doable....the question is really whether they can get right power density out of it.

The Ingenium engines are supposed to push in this direction so I think Jaguar engineers may be able to figure this out.

 

BTW is anyone familiar enough with the CAFE regulations to evaluate the following proposition:

What if Jaguar were to make engines capable of -- say -- 10,000rpm, mated with an 8 speed transmission.
Under regular driving the gearbox would perform all its shifts under 4000rpm so fuel efficiency would be quite good.
But I'm sport or manual mode the car would make full use of the entire power band.

Would this produce a car that is compliant with low CAFE emissions under regular driving but still capable of tremendous power once put in sport mode?

 

It could go either way...have a read of this article Report: Jaguar releases details on new family of engines, called Ingenium - egmCarTech

So the Ingenium is a 500cc cylinder with equal bore & stroke, so that'll be 86mm x 86mm. Reading between the lines the basic cylinder configuration would be applied to all combinations.

Funny enough there was a similar plan for the AJ-V8, why it was called the AJ26; 6+8+12=26

It's been mentioend that the Ingenium architechture will allow petrol or diesel from the one basic layout with some minor changes to the components.

If you start off with the 2.0L I4 and add two cylinders you'd be at a 3.0L I6

Or if you put two I4's together you are at a 4.0L V8

Two of the I6's together you have a 6.0L V12

Take a cylinder off the I4 & put two together; 3.0L V6

Could be all of the above, maybe?... but I can't see JLR dropping the big V8's from their range, USA is all about V8's.

Maybe an I6 in petrol, but I can't think of any modern diesel passenger engines in I6 format... and I don't think the economy of scale will be there to have both an I6 and a V6...a diesel in that capacity would probably have to be a V6 like they've always been? or maybe not?

Don't forget these engines will have to go in the Land Rover vehicles too!

Interested to see what they do either way.

 

I'm not certain it would. A 10,000 rpm engine will need some radical duration on the cams, which have a seriously negative impact on fuel economy. Those pipes will be belching raw fuel vapors even if the car does meet the *** and NOx requirements ... Unless they use an NSX style variable lobe cam.

 

That's a good point. I picked 10k arbitrarily to illustrate the point...we could just as well use 8k or 9k.

Variable valve lift and timing could compensate for the mechanical cam duration right? The ingenium engines have VVT. Remember, the engine would be optimized for low emissions at lower rpms, and would be more emissions permissive at higher rpm's.

 

So Jaguar has said the Ingenium architecture is supposed to scale in terms of cylinder count and size (both up and down). The easiest way to scale this would be to go for an I6. I agree it wouldn't make sense for them to keep the V6... My guess is since the V6 is contracted out to Ford anyway they would just phase it out over time.

The I6 idea is not crazy... MB is supposedly ditching its V6 plant for the upcoming mainstay E series...

http://www.carmagazine.co.uk/Secret-new-cars/Search-Results/Spyshots/Mercedes-E-class-coupe-and-convertible-2017/

 

If true, I suspect the folks at BMW are smiling and rolling their eyes, saying, "duh."

 

It would, indeed.