"Remember, cars are designed to fail, otherwise manufacturers wouldn’t sell more. Trucks are designed not to fail, if they do the buyers go elsewhere."
Sorry but I have to disagree to a large extent here. As recent customers of quite a large number (14) of Renault Kerax 'Extreme' we are totally surprised by cheap and shoddy designs resulting in premature failures, examples being (all at less than 50,000 kms)
- cracked airfilter housings
- split induction hoses through vibration
- Chassis cracks
(luckily not major)
- burst a/c hoses due to poor routing and chaffing.
- poorly designed axle breathers sucking dirt
- snapped half shafts
- broken leaf springs
- chassis and suspension bolts not torqued during manufacture
- Oil leaks from timing cover gasket
- Rear chassis cross members twisting under towing loads
- engine mounting failures
- engine rebuild due to dust ingress from induction pipe failures...
Oh, and we bought the Renault as we were not happy with either MB or MAN previous fleets (including a huge warranty issue with major chassis cracks on the MANs .....
All the above mentioned failures were warranty claims.
Over the same period of owning the 14 MB, then 14 MAN, then 8 MB then 14 Renaults we have owned:
2 x 75 Series LC
8 x 80 Series LC
3 x 79 Series LC
8 x Hilux
9 x 105 Series LC
1 x 120 Series Prado
And to be honest we had not one warranty issue or a premature failure which we could attribute to poor design. The 3 x 79 series all suffered gearbox failures fairly early, but largely due to extreme abuse, although I do have to admit the gearbox is not 'extreme duty' - but that is the ONLY design issue we could say we are not happy with.
IMHO the Toyota Landcruiser is largely better engineered to do it's job than most of the trucks we have tried.
Back to the topic:
If you are convinced that the engine can take it - or you are going to strengthen head gaskets, increase oil cooling, reduce charge temperatures as well as play with fuel delivery then why not go the whole hog and add:
- Propane injection
- Water/methanol injection
- forced (or more forced!) induction
Sorry for the rant - I don't want to come across too strong, but truck failures have caused us endless sleepless nights and a lot of financial losses and frankly some of the engineering on the Renaults is a joke. Don't even ask me about the Kraz (Ukrainian truck) that we bought to evaluate.... What a piece of ****!