V8 Disco 2 performance

[walker]

Could everyone who has a V8 D2 please have a look at what compression
ratio is written on your engine. It is stamped onto the block just
near the dipstick.

I have alway complained that I felt my Disco lacked power right from
brand new. What I did not know was that Landrover went and installed
a very few D2's with the low compression 4.0l engine. Most V8's will
be 9.35:1 and this is the compression stated in the owners manual. It
was pointed out to me very recently that mine engine has a 8.38:1
compression ratio.

What is even more concerning is that part of the stamp which show the
compression has been ground out with some sort of tool like a die
grinder. You can only read the :38 but can't see the 8 or 9. I am
assuming the grinding is an accident but who knows.

I wonder if you have any standing against LRA for supplying engines
which are less than what is stated in the manual and on all the
specs. I would imagine not but it is still annoying because I would
imagine that much difference in compression would cause a big loss in
power and torque.

It does explain why I can run standard unleaded without pinging.

[4bee]

I recall from somewhere, that the coppers use some sort of light ie, IR, Black, Fluorescent etc, or something that can actually "see" the indentations made by the original punching under the surface, even though there is nothing visible.
I'm sure someone here will know what I am on about.

[justinc]

AFAIK mid '01 on had high comp engines. XA and YA chassis numbers (early thor 4litres and 4.6 litres D2 in the USA) still ran the 8.38:1 engines. 1A VIN's were all high comp, including the p38A from '01.

This is from Tom at ULR parts in Melbourne 2 weeks ago, as I was enquiring about availability of hi or low comp short engines.

JC

[walker]

Hopefully someone knows more about these motors than I do. I had a quick look on the web and foound that the 4.0l V8 came out in a 8.13:1 and a 9.35:1 ratio. On my block it definately says CR ?.38:1 which doesnt not match anything.

Justin, so that means if mine is a low comp engine in an '04 Disco then something funny is going on????

[lokka]

Thats a good one walker id be pi55ed about that too mate and if you can run the std unleaded without pinging it must be a low comp engin theres an easy way to fix it tho put a supercharger on the ****er and run about 10lb of boost into it that will give ya back the ponyies ya lack thats for sure :D:D:D

[sniegy]

Adam are u sure the numbers arent :35 & not mistakingly taken as a :38
The number stamping can sometimes be a pain to read..just a thought;)

The best thing is to ring a dealer! & see what the engine no. comes up on the LRA system:D . This way u can check to see if the number matches what LRA have. It wont tell u comp ratio but at least u will know its the right engine. U can then ask the dealer to find out from the UK what the CR is supposed to be!! In a few short months they ,may get back 2 u.:wasntme:

[cal415]

Mine is 9.35:1 built late 01

[cal415]

BTW mine went great till i put on 32s :(

[walker]

Adam are u sure the numbers arent :35 & not mistakingly taken as a :38
The number stamping can sometimes be a pain to read..just a thought;)

The best thing is to ring a dealer! & see what the engine no. comes up on the LRA system:D . This way u can check to see if the number matches what LRA have. It wont tell u comp ratio but at least u will know its the right engine. U can then ask the dealer to find out from the UK what the CR is supposed to be!! In a few short months they ,may get back 2 u.:wasntme:


Been out for another look. There is no doubt it is .38, it is very easy to read. I am sure the engine numbers should match as I bought the car brand new from Landrover.

Have you heard of a ?.38 engine?

[Ken]

Yep mine says CR 9 :35:1 Hi Comp

[D110V8D]

County 3.5's are 8.35 to 1 comp.:D :D

Maybe you have a County 3.5...............does it have carbies on it??:p

:p :p :p :p :p :D :D :D :D :D :D :D

[walker]

There is one clown on every thread isn't there.:p


You won't happen to be home early Friday arvo will you?

[D110V8D]

Not this Friday I dont think.......but you can pick 'em up at work if you like.

Heidelberg.

[Graeme]

Been out for another look. There is no doubt it is .38, it is very easy to read. I am sure the engine numbers should match as I bought the car brand new from Landrover.

Have you heard of a ?.38 engine?

Maybe it was originally stamped 8.13 then overstamped with 9.35, making the 5 over the 3 look like 8. If so, then perhaps a production line correction.

[walker]

Nope, because the 38 is crystal clear and there is no 1 running throught the 3.

[grumpybastard]

Mines a low compression motor (2000 Model) and i wouldnt want it any other way! The old bent 8 ain't exactly the most frugal motor and the thought of 90 litres of premium petrol doesn't appeal to the wallet in the slightest.

You gain (from memory) 5kw or approx 6hp with the high compression motor and if you put standard fuel in it she will retard the timing to stop pinging and hence your way further down than the low compression motor.

You will gain more power simply by turning the aircon off :)

http://www.matts-domain.com/web/pics.nsf/pictures/MARR-6V6B4F/$File/MARR-6V6B4F.jpg

[walker]

Yep, but I run gas and gas works best at high compression.

[grumpybastard]

Yep, but I run gas and gas works best at high compression.

Ahhh bugger!

Sounds like a good time to shave the head then :)

I wonder what compression you can run before the valves start hitting the pistons? I hear 12:1 is the max for LPG? :)

[walker]

LOL.

I am planning on running the Rangie ute I am building on straight gas. I was recommended (not by a profesional) to take the compression to at least 10:1.

[Scouse]

**
AFAIK, you should have a high comp motor in such a late D2.

[tombraider]

LOL.

I am planning on running the Rangie ute I am building on straight gas. I was recommended (not by a profesional) to take the compression to at least 10:1.

Careful Adam

Gas aint what it used to be.

I had a 308 on straight gas, built it at 11.0:1 compression, went like a train.

Soon after gas was re-blended and octane dropped from 118 to around 102

Not good, the motor began to ping...

[Pavo]

Hi Walker,

Regarding this question you asked:
"I wonder if you have any standing against LRA for supplying engines
which are less than what is stated in the manual and on all the
specs. I would imagine not but it is still annoying because I would
imagine that much difference in compression would cause a big loss in
power and torque."

I remember a few years ago Mazda overquoted the power for the MX5. I don't remember what happened, why it happened, what was the exact result, but Wiki has this on it:

http://en.wikipedia.org/wiki/Mazda_Miata

Do a search for 'apology' and you'll see what Mazda did. I have no idea if this Wiki is accurate, but I know for a fact something did happen with the MX5 and quoted power.

Pete

[Ace]

I would reckon if you can accurately prove the wrong engine is in your disco they should give you a new one. I dont think it would take a decent lawyer long to prove that case. If your model should have a certain compression engine and it has one with lower compression and this can be proved, given it also looks to have been ground back or something then i think you have a case.

[Ken]

maybe the only problem you might have is who actualy ground the number away from the block ?