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Author Diesel engines - are they built stronger or is it coincidence?
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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11th Feb 09 at 12:21   View User's Profile U2U Member Reply With Quote

Common rail diesels are a different kettle of fish to the retro Isuzu lumps you are talking about
Daveskater
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Registered: 29th Apr 08
Location: Oxford, UK Drives: Jap wagon
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11th Feb 09 at 12:29   View Garage View User's Profile U2U Member Reply With Quote

There we go then They had a bar under the injectors to send the excess fuel back to the tank, I suppose they don't do that any more either


Numberwang!

Originally posted by AlunJ
I like you Dave, you are a man of men

Originally Whatapp'd by Neo
Dave's maybe capable of a drive-by cuddle

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pow
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11th Feb 09 at 12:31   View Garage View User's Profile U2U Member Reply With Quote

I also have a return line
Daveskater
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11th Feb 09 at 13:08   View Garage View User's Profile U2U Member Reply With Quote




Numberwang!

Originally posted by AlunJ
I like you Dave, you are a man of men

Originally Whatapp'd by Neo
Dave's maybe capable of a drive-by cuddle

Look at my pictures
sand-eel
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Registered: 15th Mar 07
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11th Feb 09 at 14:26   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by pow
I have one.


sure its not an air mass meter? as diesels have the same airflow forever as they have no throttle butterfly.
deano87
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Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
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11th Feb 09 at 19:42   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Nic Barnes
quote:
Originally posted by deano87
Some answers I needed




this in relation to why you cant compare a 90k 1llitre 12v to a diesel engine from last night by any chance?

Kind off but I was never comparing a 90k 12v to a diesel Vectra
John
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11th Feb 09 at 19:52   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by sand-eel
quote:
Originally posted by pow
I have one.


sure its not an air mass meter? as diesels have the same airflow forever as they have no throttle butterfly.


They still measure the airflow, MAF's don't measure the air mass directly, they are used in combination with other sensors.

If the flow never changed there would be no point using a turbo.

The engine still draws in more or less air depending how much fuel is being injected.
Warren G
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Registered: 14th May 06
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11th Feb 09 at 20:00   View User's Profile U2U Member Reply With Quote

deisel engines are built stronger - due to the torque they put out

but iv seem a few bent conrods, even though they are massive! normaly desiel hydrualic

due to the lower revs it will last alot longer than petrols

ie a petrol at 80mph is doing about 4000rpm and a desiel is doing 2500rpm

which technology desiels are the furture, so much more fine tuning is avaible, doing the high pressure and the way combustion takes place,

turbos on petrols you have to lower the compression to stop preigntion, but desiels work with self combustion, (pre igntion) meaning you can run alot of boost!

petrol turbo - 9.0:1 compression ratio
desiel turbo - 20-25:1 compression ratio

also the new 2.0 turbo bio turbo runs 16:1 which is low for a derv, but must run massive boost!! prob make over 250bhp with a remap!


daymoon
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Registered: 1st Aug 08
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11th Feb 09 at 20:03   View Garage View User's Profile U2U Member Reply With Quote

while we talking about diesels.. at what revs on average should the gear be changed?
VegasPhil
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11th Feb 09 at 20:25   View Garage View User's Profile U2U Member Reply With Quote

Redline


Corsa 2.0 16v Vegas - Sold
AK
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11th Feb 09 at 21:19   View User's Profile U2U Member Reply With Quote

they dont rev nearly as much as petrol engine... revs are what normally wears an engine
Chris Bingham
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Registered: 30th Mar 02
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11th Feb 09 at 21:24   View User's Profile U2U Member Reply With Quote

i always thought that the main reason for buying a diesel was MPG...so people buying them for that reason must be doing lots of miles therefore thats why you always see lots of high mileage diesels.

You wouldn't buy a diesel if you could get the same MPG out of a petrol..would you?

Also, perhaps the reason that they handle the miles well is cause they are mostly motorway miles and that doesn't wear a car as much. Never thought they were stronger than petrol, just more down to the way they were driven.

AndyKent
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11th Feb 09 at 21:27   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by daymoon
while we talking about diesels.. at what revs on average should the gear be changed?


Depends. My Golf has a 6k redline I think, but the turbo runs out at about 3.5k, so I rarely rev beyond that.
deano87
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Registered: 21st Oct 06
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11th Feb 09 at 22:49   View User's Profile U2U Member Reply With Quote

Just like a petrol car, it has optimum points in the rev range. It's just lower down I guess.
sand-eel
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11th Feb 09 at 22:54   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by John
quote:
Originally posted by sand-eel
quote:
Originally posted by pow
I have one.


sure its not an air mass meter? as diesels have the same airflow forever as they have no throttle butterfly.


They still measure the airflow, MAF's don't measure the air mass directly, they are used in combination with other sensors.

If the flow never changed there would be no point using a turbo.

The engine still draws in more or less air depending how much fuel is being injected.


oh yeah I forgot about the turbo
Mertin
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Registered: 12th Oct 05
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12th Feb 09 at 19:39   View User's Profile U2U Member Reply With Quote

Already been answered but yes diesel engines are built alot stronger, so they can handle the torque

You dont see petrol driven generators either do you? All big engines are diesel
Daveskater
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12th Feb 09 at 19:44   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by aPk
quote:
Originally posted by daymoon
while we talking about diesels.. at what revs on average should the gear be changed?

Depends. My Golf has a 6k redline I think, but the turbo runs out at about 3.5k, so I rarely rev beyond that.
The redline in the Corsa C Combo I used to drive at work was just over 5k, I took it near that a few times, but the turbo tuns out at 4k so once you get past that it barely pulls at all

It was a 1.7DI, but still good enough to spin the wheels when the clutch is dumped at 2.5-3k rpm


Numberwang!

Originally posted by AlunJ
I like you Dave, you are a man of men

Originally Whatapp'd by Neo
Dave's maybe capable of a drive-by cuddle

Look at my pictures
DizzyRebel
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Registered: 2nd Jan 09
Location: Lincoln
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12th Feb 09 at 20:33   View User's Profile U2U Member Reply With Quote

Diesels run higher compression so usually run a fully forged bottom end. Everything is usually over engineered in them to take the strain so they usually last a fair few miles.

they rev low because unlike petrol engines they produce peak power at low RPM due to the extra potency of the highly compressed a/f mixture.

But please, no one compare power and torque together or say one is better than the other or an engines tuned for more torque than power...

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