I guess we can put this one to bed after 8 pages.
Bugger! 2 minutes premature. 
Brentanna:
Iâll try again then.For âdetonate diesel fuelâ read âignite diesel fuel under compression ignitionâ sorry thought I explained the mistake.For âwhich would ignite petrol long before the spark does on a petrol engineâ read âwhich would âdetonateâ petrol long before the spark ignites petrol,in a petrol engine,if you injected petrol into a diesel engine under diesel engine compression ratios at the same timing as you would with the diesel engineâ.Itâs my mistake in the way I was trying to explain the issue Iâm getting at not anything wrong with the ideas themselves.
You are assuming that you would inject the petrol at the point of initiation of the compression stroke.
No that just shows that youâve not understood the issues of using high Octane rated fuel like LPG in an engine that needs fuel with a high Cetane rating nor read the bit where I said using the same timing as the diesel engine uses.
The relevant issue,in the context of using alternative fuels,is would a spark ignition LPG fuelled engine,be a more practical idea,considering the fact that spark ignition is more suited to using LPG than a diesel engine is and in view of the existing availability and price/taxation advantages which LPG has compared to other types of alternative fuel.
Also current engine management systems,which run both the ignition and the fuelling,from one ECU,seems advantageous to having two seperate fuelling systems running differently timed gas and diesel fuelling systems in addition to the fuel cost savings of being able to run on just LPG without diesel being required at all.
Which bit of âa diesel engine is better than a petrol engine for use in heavy trucksâ did you fail to understand when you read the link I kindly provided you with?
Youâve been gone for about 7 hours so you have had plenty of time to do a bit of reading. Did you notice that CNG is available in an uncompressed form through a network of pipes all over the country and has no road fuel duty? All you need to convert the uncompressed gas they deliver to your premises via pipes is a small compressor and tank.
Tell you what though, you obviously know better than all those people that have been speccing trucks with diesel engines. You think they would be better buying petrol engined vehicles.
Why donât you start up a truck dealership. If your theories are correct, youâll make a killing. Or will youâŚ
Wrong again mental midget the compression ignition engine is more efficient, and requires less maintenance once again please post some links from reliable sources rather than babbling on like an idiot. Diesel engine are known to get over 1 million miles of use a gas spark ignition engine doesnt even come close. Why would companies want to be replacing engines every 200,000 km rather than over 1 million km. Your logic is flawed at best, and completely off the main focus of the discussion. Once again looks more like trolling than actually contributing to the discussion.
Brentanna:
Well that explains it I dont know how old Carryfast is maybe he just alls short of 10
No but old enough to know that a decent supercharged,spark ignition,engine will always be able to outperform a turbocharged diesel of similar size and with modern technology and fuel prices the fuel economy argument,in favour of diesel engines,is becoming increasingly irrelevant.
Carryfast, are you going to answer the questions that Diesel Dave asked you earlier in this thread?
If you donât want to I will understand why. So will everyone else. So which is it? Time to put up or shut up.
carryfast you are really a mental moron anyone who thinks a gas engine the same size as a diesel will put out more torque is a few bricks shy. If that were the case they would not have gone from gas to diesel in the first place. Now again please you are dumber than dirt please post some links to reliable sources. I am sure eevryone is getting rather tired of hearing the same BS from you constantly.
Hey CF. What type of engine do they fit in those big airport fire tenders you used to drive and why did they choose that engine?
Brentanna:
Wrong again mental midget the compression ignition engine is more efficient, and requires less maintenance once again please post some links from reliable sources rather than babbling on like an idiot. Diesel engine are known to get over 1 million miles of use a gas spark ignition engine doesnt even come close. Why would companies want to be replacing engines every 200,000 km rather than over 1 million km. Your logic is flawed at best, and completely off the main focus of the discussion. Once again looks more like trolling than actually contributing to the discussion.
A decent high revving relatively small car engine can do better than 200,000 kms let alone a low revving large capacity truck engine.But itâs not the first time that Iâve heard that troll bs everytime thereâs a disagreement.
Now come on BJD everyone knows they were supercharged petrol
A decent high revving relatively small car engine can do better than 200,000 kms let alone a low revving large capacity truck engine
please link me to a reliable source for that info please because I am not stupid been driving a while have had more than a car or two, driven older gas powered grain trucks, grew up on a farm, kinda sorta know what gas powered trucks can do and what milage one can expect out of them. So please post some proof from a reliable source.
Big Jonâs dad:
Hey CF. What type of engine do they fit in those big airport fire tenders you used to drive and why did they choose that engine?
They did actually use a naturally aspirated petrol motor in many of the previous generation ones for many years.(Rolls B81).Shame it was never increased in size to 18 Litres and Supercharged because that would have blown the doors off of a two stroke Detroit.But that Detroit did around 2 mpg more than the old 1940âs technology,naturally aspirated,carb fed,Merlin/Meteor in the Centurion tank which was around 25 tonnes heavier and ran on tracks not wheels. 
This Thread is starting to look like Israeli - Palestinian diplomacy I think its a case of agreeing to disagree
They did actually use a naturally aspirated petrol motor in many of them for many years.(Rolls B81).Shame it was never increased in size to 18 Litres and Supercharged
yup thats what I would want if I were to be responding to a plane crash with fuel all over the place. Jet a and JP$ avgas all love sparks. bet you the vapors from a 130 octane avgas spill would relly make them put out the water.
Brentanna:
A decent high revving relatively small car engine can do better than 200,000 kms let alone a low revving large capacity truck engine
please link me to a reliable source for that info please because I am not stupid been driving a while have had more than a car or two, driven older gas powered grain trucks, grew up on a farm, kinda sorta know what gas powered trucks can do and what milage one can expect out of them. So please post some proof from a reliable source.
Car or two.Mercedes 500/560 V8 ?.Jag V12 ?.Rolls/Bently 6.5 V8 turbo charged 
etc etc.
link please reliable source not your gibberish
Carryfast:
Big Jonâs dad:
Hey CF. What type of engine do they fit in those big airport fire tenders you used to drive and why did they choose that engine?They did actually use a naturally aspirated petrol motor in many of them for many years.(Rolls B81).Shame it was never increased in size to 18 Litres and Supercharged because that would have blown the doors off of a two stroke Detroit.But that Detroit did around 2 mpg more than the old 1940âs technology,naturally aspirated,carb fed,Merlin/Meteor in the Centurion tank which was around 25 tonnes heavier and ran on tracks not wheels.
I knew that bloody Detroit engine was going to show up sooner or later.
What engine is fitted in the latest crash tenders? This petrol engine (Rolls B81) you mention is an ancient design that dates back donkeyâs years.
bringbakbiffa:
This Thread is starting to look like Israeli - Palestinian diplomacy I think its a case of agreeing to disagree
Shh, youâll frighten the fish.
Anyway, they should nuke the Palestinians from orbit. 
Carryfast:
Brentanna:
A decent high revving relatively small car engine can do better than 200,000 kms let alone a low revving large capacity truck engine
please link me to a reliable source for that info please because I am not stupid been driving a while have had more than a car or two, driven older gas powered grain trucks, grew up on a farm, kinda sorta know what gas powered trucks can do and what milage one can expect out of them. So please post some proof from a reliable source.
Car or two.Mercedes 500/560 V8 ?.Jag V12 ?.Rolls/Bently 6.5 V8 turbo charged
Yeah, I 've had all them and more. They ran real well on propane too. 
Brentanna:
They did actually use a naturally aspirated petrol motor in many of them for many years.(Rolls B81).Shame it was never increased in size to 18 Litres and Supercharged
yup thats what I would want if I were to be responding to a plane crash with fuel all over the place. Jet a and JP$ avgas all love sparks. bet you the vapors from a 130 octane avgas spill would relly make them put out the water.
Decent fire trucks just usually use the fastest,most powerful,options available because itâs all about getting there while thereâs still something left to save.Fuel type doesânt usually come into the equation and the ignition systems were all built with those scenarios in mind so there wereânt loose sparks flying around anyway.But weâre talking about highway use anyway not fire fighting trucks.