Thread: Petrol VS diesel?

Most fixed pitch light aircraft piston engines simply have a red line maximum rpm, which can be used for continuous operation - but few owners approve of this.

However, many, if not all, more sophisticated aircraft piston engines have specific restrictions on the power that can be used, which usually specify a maximum power available for takeoff (specified by rpm and manifold pressure), which is usually limited to a short time, typically five minutes, and a separate, lower, power limit for contiuous operation.

Originally Posted by trout1105

Oh Dear
ANY engine be it marine or car is NOT designed to be run flat chat all the time and IF you actually knew anything about boats you will know that the boat itself will always outlast its engine.
Like I have said before if you need to get somewhere at a certain time then leave earlier because believe it or not You do not own the road and other road users don't want/need to drive flat chat and you will simply just have to put up with it and allow a bit of extra time to get to your destination.

I meant you would often be sick of the boat long before the high rpm operation was detrimental to the engine. I’ve personally only seen engines replaced on hours, never due to wearing out (although I have spoken with another Shark Cat owner on his 17th set of motors).

A 4wd at 100km/h is far from redline. So hardly working it’s arse off.

No, I know nothing about boats - only served on her majesty’s ships and own an operate my Sharkcat.

Nope, I know nothing about being at sea .


Btw, as a citizen and tax payer - I, like all other Australians - Do own the road

100km/h is not even remotely “flat chat”

Originally Posted by AK83

LOL! so physics has nothing to do with it, and both Isaac Newton and Einstein were wrong(about their respective theories of energy and it's conservation.
Good to know.
Maybe they're were part of the government conspiracy too.
All just a ruse to make governments all that money from speeding fines.
LOL! they must have paid off the national debt by now considering all the income those speeding fines must be bringing in.




Sorry, but define 'highway speeds'.
Half the highways here in Vic have had their speeds reduced to the point that it's quicker to detour 30klms on a 30klm drive .. that is the 60klm drive is quicker than the 30klm route!
Your assumption is that highway speeds are 100km/h .. which is just wrong.
I dunno where Woolgoolga is, but it's obviously not anywhere near Warnambool-Port Fairy in Vic.
You try maintaining 100km/h in this highway!(without a heap of demerit points and loss of license that is).
And the reason this 30km stretch of highway has it's speed limit set to 80k/h for 99.9% of it's length is that too many numpties with no respect for others, SPEEDing along it causing fatalities to the point that the conspiratorial managers of the state have decreased its speeds to what the flow really is.


It's hysterical how one topic turns to something else completely and onto reading the noble prize winning comments about speed and it's dangers.

Hardly.... I know that section of road - Speed wasn’t the cause of those fatalities. It’s a symptom of stupidity or incompetence.

Speed alone is not a problem. Like guns - guns don’t kill people - neither does speed. Inappropriate application of it in unsuitable locations or conditions is the problem.

If you can’t see the root cause - steering wheel attendants - then you aren’t looking at the cause of the problem.

Originally Posted by Tombie

Hardly.... I know that section of road - Speed wasn’t the cause of those fatalities. It’s a symptom of stupidity or incompetence.

Speed alone is not a problem. Like guns - guns don’t kill people - neither does speed. Inappropriate application of it in unsuitable locations or conditions is the problem.

If you can’t see the root cause - steering wheel attendants - then you aren’t looking at the cause of the problem.

But it's easier to blame the guns, the venues rather than the thugs that gave us the lockout laws, speed rather than the spastics driving....

Originally Posted by 1nando

so tell me, in that case which is the better to tow with; diesel or petrol?

Ps: speed never killed anyone, driver error or inability did!

There is a Good reason why Tractors and trucks that tow pretty much 100% of the time are Diesel powered, Reliability, Durability and Economy
Yes a modern petrol engine can do the same job BUT when they are asked to do the heavy work they chew the juice and don't like it much, A diesel engine "Thrives" on hard work

Originally Posted by trout1105

There is a Good reason why Tractors and trucks that tow pretty much 100% of the time are Diesel powered, Reliability, Durability and Economy
Yes a modern petrol engine can do the same job BUT when they are asked to do the heavy work they chew the juice and don't like it much, A diesel engine "Thrives" on hard work

Agree with nearly all that. In saying that I reckon my 5.6 liter v8 NA petrol would out work and outlast any modern day highly strung small capacity diesel $#tbox

In regards to the speeds people travel at while towning - I couldn't really give a toss what speed people choose to use. If I catch up to someone travelling slower I get past when ever it is safe - no big deal. No point getting impatient to get past as that just leads to doing something dumb - just look at the monthly dash cam Australia youtube channel vids - 99% of the **** there is either inattention or impatience.

Back to the petrol vs diesel question. I personally wouldn't own a DPF equipped vehicle so if buying new I'd be getting a petrol. Otherwise I'd go diesel for a 4wd

Originally Posted by trout1105

Oh Dear
ANY engine be it marine or car is NOT designed to be run flat chat all the time .

Industrial/commercial diesel engines have a governed rpm and power rating. They are sold to be used at this speed and rating continuously. This applies to marine, stationary and mobile plant and heavy automotive engines. Ratings can vary according to the application The Detroit 8V92TA's in my Road Bosses were rated at 435 hp @ 2100 rpm. Same engine in marine dress was 545 @ 2300. Marine, gen set and pumping engines are often run at rated revs and output for days on end if not weeks. I would not use a small car diesel engine at full load and 4000 rpm for any time longer than short bursts. There would be legs out of bed and busted cranks.