A fellow enthusiast member informed me about new version of the Kennebell Twin-screw lineup.

He mentioned there was now a 3.2L big unit, with seems to have similar outside dimensions of a 2.8L one. As I wasn’t following it anymore for a long time, this was all new to me, checked it immediately and found it is indeed correct. The main difference t the 2.8L is a slightly larger inner diameter and a new rotor design that brings it to 3.2 liters.

I hadn’t planned anything anymore with my car (in the foreseeable term at least), however I had already investigated a couple of years ago to fit a 2.8L version especially as I have an enlarged engine and a very high output a larger unit than the 2.6 one would be a better fit. Back then I already knew it would be relatively easy to adapt the 2.6L kit for the 2.8 one, but for a mere 0.2L increase it would not make sense to go for it.

This newer version seems to be more efficient again and could yield maybe to 70 hp when compared to a faster spinning 2.8L (so to get similar flow of air). Am not expecting that, but I wouldn't be surprised if it could be in the 30-50 hp on my car. My last dyno with the 2.6L was about 630 rwhp, so this would bring it maybe to 660/670 rwhp without even increasing the airflow. Then a little bit if spinning faster here is already a potential 700 rwhp in sight

However that is actually not the main reason I got interested, its more that the 3.2 needs to spin less fast for the 630 rwhp, so it will make less noise. The best SC ratio was always about 2.0/2.1 going higher would increase the noise, where 2.3 would be the max I still found ok, the 630 rwhp was at about 2.6 and that was to loud for me.
With the 3.2 I can drive at 650 rwhp (give or take) yet remain on the 2.1 ratio. Heck it could be even soundless when going to a 1.8 ratio, and still have more then 500 rwhp.

Needless to say, it was something I couldn’t resist for the easy hp gain and lower noise levels, especially as my circumstances have changed, and would like to do some work again on my car.

So behold, below the just received 3.2L unit:

 

obviously we wait to know how this new unit will go

 

I am here to watch it.

 

Also watching, I have a 2.8 sitting on a shelf waiting for the time to jump into it!

 

The preparations have just started, though it will take at least month before I have some proper feedback on the status.

 

Can't wait! I will definitely be following along.

 

Hello Avos! I'm new to the Jaguar forum, I have read a lot about you however with your twin screw conversions for Jaguar V8s. I own a Jaguar XJR X308 4.0L, and was wondering, do you think you would do a conversion kit with this supercharger? Also do you know the logistics or the challenges between twin screwing a 4.0 compared to a 4.2, and what's the better engine? As I have thought of the idea of swapping my 4.0 unit to a 4.2, a conversion to a twin screw would be the finishing touch!

 

Sorry, you're a couple of years to late as I stopped making these kits for your car.

The 4.2 engines seem to be stronger, the pistons are stronger and also have oil jets for cooling, which could be helpful pending on how far you want to push your engine.

As to this particular project of the 3.2, Something came in between that has hindered me to start the project fully, but hope to do in the next 2 months or so.

 

I may need another supercharger, as rebuilding mine (thus sending it to the US) would not make financial sense.
How can the larger body of the 2.8/3.2 be adapted to work? Wouldn't it need too much shaving from the sides?
OR, can the chargecoolers be shaved, and if a hole comes through, just weld it. What are they made of? Aluminium?
Could you please post the dimensions of your 3.2 unit? And do you know which front drive to get, so that the dipstick still sits on top when the supercharger is inverted?
I hope I can get back on the road as soons as possible ...

 

Have send a mal as well on your supercharger, it may just be the coupler.

The 3.2 would be to long for your 4.2 XJR, it adds about about 20mm in length, for your 4.2 XJR, so can be made to fit without serious modifications to the intake/fittings,

The 4.0 XJR and XKR versions have plenty or room, and the intake can be adjusted to fit much more easily,

 

I started about 2 years ago, and took my car already apart for it.
Then something came in between, and now 2 years later I was finally able to start the project again about 2 weeks ago, and finished it just now.

All good, will first drive it some time and see if I want to push it further again and measure it or just enjoy.

 

So far so good, she feels very (very) strong/powerful, however as its actually 4 years since I have driven her, I may not be able to determine the difference in power by the seat of the pants.

She will be my daily driver now again if all goes well, as I just sold my RRS which has been my daily driver in that time.
I can honestly say I have really enjoyed my RRS, and if it wasn't for my wish to go electric (and a good deal on the RRS), I would have kept that one.

So I hope to enjoy my xkr for the coming time, and stretch her legs again.