Is a 4L really a 4L?

[lmagDM]

I am trying to order some new piston rings for my '94 4L Chim(manufactured late '93). When asked if I needed the +20 rings I was stumped. The specs in my handbook say the engine capacity is 3952cc...Steve Heath's manual lists a 4L as 3950cc and the standard RV8 of this class is listed as 3948cc. If I calculate the volume of each cyl (assuming 94.04mmx71.12mm) I get close to 3950cc . Bottom line is I need new piston rings. Anyone know what the real figure is? Has anyone ordered piston rings for their early 4L Chim and if so what size engine did you use to order them?...thanks in advance for your input.

[debaron]

+1

Exactly as Spend says - The 400 (4L) can be either a 3.9 or a proper 4.0 (in Range Rover terms)

The way to distinguish yours is if the main bearing caps are crossbolted then it's 4.0. If not then it's 3.9


Also Rimmer Bros have a list of engine number and type if you want to double check


http://www.rimmerbros.co.uk/content--name-Rover-V8...

[SteveGRF]

When you strip the engine, use a vernier calipier to measure the bore & piston diameters & or have a look at the top of the piston crown they usaully stamp in the oversize (e.g +20 if previously over bored).

[lmagDM]

Thanks to all for your quick responses...

[v8 racing]

The easiest way to tell if its 3.9 or 4.0, the nearside of the engine where it bolts to the bellhousing will either have a visible plate where the trigger sensor bolts in 4.0, or on a 3.9 it will just be part of the block casting, i have never come across a small journal cross bolted block that was done at the factory, the only ones i have seen are ones that have been cross bolted afterwards.

[lmagDM]

The block is not cross bolted...I will have a look for a plate, however I did not notice one when I pulled the engine...Thanks for the tip!

[V8TVR1978]

Leo: Sounds like you may be getting to the bottom of your problems... That's great if you are. Would like to see it on the road this summer when the Spousal Unit and I make the trip to "TorontA" for the BBQ and Bronte. Is the 3000S staying in the family???????
Talk to you and Mike later.......

The LEPPARDS.