Jags have always had a finicky reputation for reliability, so I thought it was awesome the I-4 made it on the Wards list! Big bravo to the in-house engineers who designed it! Get all the details here.

 

Really curious to drive the 300-hp version

 

It's possible to get huge BHP figures from quite small engines. In the 80s, in Formula 1 you could install a 3 litre NA engine or a 1.5 litre super or turbo charged. At one time I think the 1.5 litre Renault engine used by one of the teams produced 1000 hp ! Of course it wouldn't have lasted too many miles I suppose, so the trick is to get long life as well as performance, something that has eluded quite a few engineers over the decades.

 

Looks like it has a dipstick. Well, hooray!

Is this a solely DI (GDI if you prefer) engine? If so, what have they done to prevent (intake valve) carbon build up?

(By way of example, VAG fit another 4 injectors in the same position as a non-DI engine.)

 

My understanding of the reason behind using both DI and plenum injectors is for reason of gas mileage efficiency as each has advantages at different motor rpms. And yes, it keeps the intake valve clean but that's not the intended purpose. There's more to the story though because some DI engines don't suffer the carbon buildup as badly as others.

 

I just wondered what the engine in this thread has, not least because I understand at least one other Jag engine has carbon problems.

 

What engine? I'm interested in what engine, mileage, NA or supercharged, and use (city/country etc.). If the engine is susceptible to carbon build up on the intake valves there's no getting around it except walnut shells or preventative chemicals in the intake before it gets too bad (which I don't think is a good idea).

 

The 5.0, I gather.

 

After a little research that's the engine I found to be a culprit as well and its NA I believe? I'm more curious about the 3 liter supercharged V6 petrol....since that's what I have. They've been out there long enough to know if it's a problem with them. Just want to know if/when I should prepare to blast the intake valves/tract or move on to another car. Don't mean to hijack this thread but it seems relevant.