What's the difference between KV6 and 25K4F

[LittleMan]

Hi,
I'm not sure I understand, and I couldn't find the information anywhere: what's the difference between the two?
As far as I can see, everyone of the forum speaks about a KV6, I can find KV6 at different online parts sellers, but I can also find the 25K4F engine designation. Which mine is, according the any VIN decoder, and to the registration papers.

So is anyone able to shed some light?

Thank you!

[suzublu]

Have a read through here, https://rimmerbros.com/content--name...le-Information

[T-Cut]

Thus a 25K4F = 2.5 litre V6 = KV6 2.5

I think.

TC

[LittleMan]

The lettering makes no sense.
If they had defined number 4 as 16valves, that a 2.5 it’s obvious the wrong designation, and should be 25K6F
Also, the attached picture is wrong in terms of engine codes, P55 and P56 saying the same thing. And mine it’s an auto with code P56.

Anyway, asuming this information, if I chose my car being a 25K4F or KV6 when ordering parts online, will that be ok? Do they really mean the same thing?

My 75 was manufactured probably in the last batch of 2005, being registered in 2007

[T-Cut]

Originally Posted by LittleMan

The lettering makes no sense.
If they had defined number 4 as 16valves, that a 2.5 it’s obvious the wrong designation, and should be 25K6F

Quite so. The number of cylinders would be a more logical term, since all K-series have 4 valves/cylinder anyway.
However your engine is definitely a 2.5 litre KV6, so order parts on that basis. Rimmer/Xpart use this teminology for all engines.


Rimmer:https://rimmerbros.com/ItemList--Rov...ngine--m-12883


TC

[Sonic ZS]

Originally Posted by T-Cut

since all K-series have 4 valves/cylinder anyway

There were four cylinder 8V 1.1 and 1.4 K-series engines produced, albeit not in 75/ZT

[T-Cut]

Originally Posted by Sonic ZS

There were four cylinder 8V 1.1 and 1.4 K-series engines produced, albeit not in 75/ZT

Thank Goodness.


TC

[SKS Disco]

Originally Posted by suzublu

Have a read through here, https://rimmerbros.com/content--name...le-Information

Originally Posted by LittleMan

The lettering makes no sense.
If they had defined number 4 as 16valves, that a 2.5 it’s obvious the wrong designation, and should be 25K6F
Also, the attached picture is wrong in terms of engine codes, P55 and P56 saying the same thing. And mine it’s an auto with code P56.

Anyway, asuming this information, if I chose my car being a 25K4F or KV6 when ordering parts online, will that be ok? Do they really mean the same thing?

My 75 was manufactured probably in the last batch of 2005, being registered in 2007

Originally Posted by T-Cut

Thank Goodness.


TC

Just a little bit more info for you.
You could not have 25K6F. Position 4 ( means valves per cylinder ) This can only be one digit. So it is 4. This differs from other K Series engines that may be 14K2F for instance. ( 8 valve engine ) This was Powertrains numbering protocol.

Maybe as well I should explain what the next 3 digits mean.
P55
P56 for example.

K Series engines were not actually built in the Longbridge factory. They were built just down the road at Powertrain. They did NOT go up to assembly line Cab B for instance as just an engine. Before they left Powertrain they had the Gearbox and all other ancillary bolt on items like A/C compressor, starter motor, alternator etc bolted on so it then became a complete power unit assembly. So those letters P55 actually mean ( ROVER 75, 2.5, MAN, ACON, PENCIL COILS ) while P56 means ( ROVER 75, 2.5, AUTO, ACON, PENCIL COILS)

It told the assembly line which power unit assembly configuration was assembled for what vehicle variant.

If the assembly code was P58 that would have meant ( ZT, 2.5, MAN, ACON, 190PS +50DEG, PENCIL COILS )

May also be worth noting there are some errors in that screen shot above. That is really old data that does not seem to have ever been corrected.

Hope this helps some.

[clf]

Could it mean 4 valves per cylinder perhaps?

Sent from my SM-A600FN using Tapatalk

[T-Cut]

Originally Posted by clf

Could it mean 4 valves per cylinder perhaps?

Yes, it says so.

But why use the '16 valves' term? Why complicate it?


TC