Outer Limits 4x4 Board

just wondering is there a great difference between these to motors mechanically?? is the 6.5 just a bored out 6.2 ? different crank?
can they both accept a turbo?

cheers

mic

No/no/yes/yes

6.5 - 4.057" bore
6.2 - 3.978" bore

6.5 rangie wrote:6.5 - 4.057" bore
6.2 - 3.978" bore

Whoops no/yes/no/yes

far as i know they r close, the heads are inter changable
old boy has the 6.5 bottom and 6.2 heads on it bought it this way as the guy who owned it first blew up the 6.2 bottom donno how but what i was told,
turbo shouldnt be a problem

all replies straight to the point. I like it

cheers guys

mic

Just like any diesel, you can turbo both of these motors. I don't know the specifics of how much boost etc but I know that they really take to a bit of boost. One thing that I've heard is that in a lot of cases they are more economical with a turbo for highway driving but (Only chatting to the owners of these motors that I know) around town they love the sound and extra power too much and tend to have a heavy right boot No-one uses these in a winch type comp truck because they are heavy and don't have enough of a rev range for that type of application. But I've heard nothing bad about them for a tourer other than the use a bit of fuel around town compared to most other diesels, but as I said, its usually the giggle factor of the V8 that causes poor fuel economy

They have a high compression ratio of around 21.7 to 1 and turbo boost is around 6psi (i think). Best bet is to buy lower comp pistons (they are around 17 to 1 i think) but wacth for cracking heads as they are prone to this. The later 6.5 is a better motor with the improved water flow with duel thermostats and better water pump, and something about the heads but i can't remeber what that was at the moment

The early 6.2 engine block was prone to cracking, particularly from the bolt holes for main bearings.

The casting was beefed up when the 6.5 was introduced to fix that problem. 6.2's from that year until they were dropped, used the same casting.

The cracking in the heads is common and is fixed by fitting a sleeve in the water jacket. The crack is left alone - the sleeve stops the leak.

Only the later 6.5 with serpentine belt fixed the cooling water problem - pockets of steam form in the rear of the cyl heads. The high output water pump can not be fitted to the earlier engines (with vee belt) because it rotates in the opposite direction.

Toughnut,

Hate to be a pain in the ass but

http://www.maddison4x4.com/component/op ... tstart,11/

JF

Both the Ibex at last years OBC ran 6.2 also. Though they were shite for the high speed stuff. Couldn't keep them cool. We stopped during one of the creek runs and put 20ltrs of water back into the rad!

We've built four trucks with the same engines now for the UK scene.

JF

Yeah true. Pretty good I guess for tight stuff. The comps we do here in OZ are usually a bit more open. By the way. Aren't the UK teams all members of the roll over club OH. So am I

Wasn't there a ceramic piston in the 6.5 turbo vervions ?

james feeney wrote:Both the Ibex at last years OBC ran 6.2 also. Though they were shite for the high speed stuff. Couldn't keep them cool. We stopped during one of the creek runs and put 20ltrs of water back into the rad!

... and if you can't keep it cool in Scotland, then you probably can't keep it cool anywhere

Are they that powerful though? will a turbo diesel patrol leave them for dead?

quick60 wrote:Wasn't there a ceramic piston in the 6.5 turbo vervions ?

The later fuel injection pumps have some ceramic parts. Not sure if the piston in the pump is ceramic. These later electronically controlled pumps have a poor reputation.

toughnut wrote:Yeah true. Pretty good I guess for tight stuff. The comps we do here in OZ are usually a bit more open. By the way. Aren't the UK teams all members of the roll over club OH. So am I

Cheers for the reminder toughnut.

Our car was the only one to roll actually (well, tip). It happened 57 seconds into the 2005 OBC. Got it all on video tho and as the Navi, it only took me 1min 58secs to get it back onto its wheels. Unfortunately it had hydraulic'd itself!
http://www.offroadimages.com.au/OE/Even ... dex_2.html

Anyway, back on thread. Personally for a comp truck I wouldn't have a V8 diesel, they are far too heavy and take up a lot of room in front of the bulkhead.

JF