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~3500 stock, there's at least one guy running it way faster (can't recall exact rpm).Quote:
Originally Posted by cal415
The same on fuel providing they aren't decompressed (i.e not running much boost anyway) and you don't use the boost.Quote:
Originally Posted by cal415
Which I suppose is like me having a 4wd that never leaves the garage.:angel:
Have you looked in to some of the kits available for an LS1? Theres plenty of them running boost on a stock bottom end with no decompression plates and driven normally they are fine for fuel, given high RPM and lots of throttle is when they start chewing it.... a turbo'd LS motor would be very usable in a 4wd...
Simple physics dictates that if you boost a petrol engine, you need higher octane fuel or lower compression to prevent detonation. You could retard the ignition or richen the mixture to get some effect.Quote:
Originally Posted by cal415
But no matter which method you choose, your off-boost efficiency takes a dive so fuel consumption increases.
If you'd rather run ethanol or av-gas to suppress detonation. Then your running cost just took another leap.
When you're on boost, all the extra air that's being pushed into the engine is acampanied by extra fuel.
Result, your fuel consumption increases.
Personally I can't see a high horsepower petrol v8 as good for anything except throwing mud or **** factor. While that might be great fun, it's not much use for a vehicle to actually go places.
A 50hp diesel tractor would be far more capable.
A 3-53T in standard trim is 131 bhp @ 2500 rpm, 312 lb. ft. @ 1600 rpm in industrial engine tune and using N65 injectors. Joe Hawkes says you can run N90 injectors, bigger turbo, and blower bypass, up the governed speed to 2800even 3000 rpm as the engine will be lightly laden in a Land rover, get at least 200 bhp and around 450 lb. ft. Detroits have an unequalled torque curve rarely bettered by comparable engines, being particularly good from clutch engagement, 800 rpm. The little all aluminium Detroit according to Hawkes weighs a bit over 200 kgs. A very light package. And the bonus is the exhaust note.Quote:
Originally Posted by Dougal
Quote:
Originally Posted by Dougal
You're kidding here right ? I can see many factors that High HP Petrol engine will be usefull , one that has been already mentioned = Sand Dunes.
I dont mind diesels. Just I prefer my V8s. I have always been this way.
A diesel also has a much smaller usable rev range in each gear, lets say from 1800 to 3500, so you have about 1700 worth of rpms to work with in each gear.
A petrols usuable rev range is say 2500 to 5500, which is 3000 worth of rpms.
In autos this is not so important (so in my exact case it's completely irrelevant) but in a manual I have seen many times where the diesels rev range has lead to three gear changes needed to get enough momentum and the right speeds to get up a section of rutted and solid rock hill climb, where as the petrol V8 was able to launch from second and adjust the revs most of the way to the top :cool:. This is just a example, and ofcourse gearing and other factors will lessen or increase the effects, but it does have some merits to it IMHO.
Cheers
Grimace
p.s. Did I mention I love V8s
So you can dig holes faster?Quote:
Originally Posted by Disco_owner
I believe you did.Quote:
Originally Posted by Grimace
But in your example above, if you have a diesel that pulls from 1800-4000rpm or from 1500-3500rpm then you have a similar engine speed range to the V8 running 2500-5500rpm.
5500/2500 = 2.2.
4000/1800 = 2.22
3500/1500 = 2.33
There's more to be gained by pushing your usable rpm lower, than higher. This is regardless of what is fuelling your engine.
The thing you also need to consider is the fact you dont have to drive it as hard or rev it as hard so the fuel consumption can be pretty well on par, trust me i have done the petrol turbo thing and the difference in consumption was minimal - but i didnt say there was no difference....Quote:
Originally Posted by Dougal
Simple physics dictates boosting a diesel to any signicant level also requires more fuel right?
And personally i dont give 2 craps about your opinion of V8s being wanky etc go Ahead put a 50HP motor in your truck, that'll be fun to drive :BigThumb:Quote:
Personally I can't see a high horsepower petrol v8 as good for anything except throwing mud or **** factor. While that might be great fun, it's not much use for a vehicle to actually go places.
A 50hp diesel tractor would be far more capable.
I drive on the beach alot and i dont care how much power you can get out of a 4bd1 it will never compare in that situation to a petrol V8. The extra power WILL be usefull in that situation and the higher RPM makes all the difference.
And comparing a tractor to a car for capability? thats like comparing a 4db1 and a LSx Motor......
Lets go back to talking V8s here, leave the diesels for the old folk to putt around in. :twisted:
(flame suit on)
Depends how good you are at physics.Quote:
Originally Posted by cal415
A turbo makes a diesel more efficient, it uses less fuel for the same load as without a turbo.
The compromises involved in fitting a turbo to a petrol make them less efficient.
Which is one of the reasons why a toyota prius isn't turbocharged but the diesel lupo which uses less fuel is.
50hp 4wd's. Plenty of them around. Landrover, Suzuki, Daihatsu etc. They surprised the world with where they went.
And how slow they got there no doubt!
So are you saying a 4bd1 would make 300hp on the same ammount of fuel it makes its stock power at?