common rail diesel
Submitted: Saturday, Oct 24, 2009 at 21:01
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bill
could anyone exolain to me the difference between diesel and petrol common rail. i realise the pressure in rail is quite different. is the pump for the diesel in the fuel
tank and electric or is it mechanicly driven, and external. buying a common rail patrol.. thanks for any info
Reply By: pop2jocem - Saturday, Oct 24, 2009 at 21:44
Saturday, Oct 24, 2009 at 21:44
bill, generally speaking the pressure generated by the pump for a "common rail petrol" is a lot lower than for a diesel because most (not all) petrol engines have the fuel injected into the intake manifold and therefore require a lot less pressure than for a diesel where the fuel is injected into the cylinder at or close to maximum compression pressure. The pump for petrol engines is quite often in the fuel
tank and electrically driven while the diesel is almost always mechanically driven off the engine.
Cheers Pop
AnswerID:
388558
Reply By: Member - Stuart P (WA) - Saturday, Oct 24, 2009 at 22:18
Saturday, Oct 24, 2009 at 22:18
petrol injection runs at 35-40 psi
diesel runs at 1800-3000psi( 180-300atm)
AnswerID:
388562
Follow Up By: Richard Kovac - Saturday, Oct 24, 2009 at 22:36
Saturday, Oct 24, 2009 at 22:36
Sorry Stuart
1atm = 14.7 psi
Cheers
Richard
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656210
Follow Up By: fisho64 - Saturday, Oct 24, 2009 at 23:44
Saturday, Oct 24, 2009 at 23:44
common rail diesel injects at up to 23000psi
Old school unit style and mechanical injection runs at180-400 bar
not sure about petrol injection, but that sounds a bit low (35-40psi)
Thats around the pressure of your garden hose?
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Follow Up By: Member - Stuart P (WA) - Saturday, Oct 24, 2009 at 23:56
Saturday, Oct 24, 2009 at 23:56
standard
water pressure 15psi
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Follow Up By: Richard Kovac - Sunday, Oct 25, 2009 at 00:12
Sunday, Oct 25, 2009 at 00:12
Water pressure in
Perth was 80 Psig they drooped it down so we didn't wast as much
water.
Pressure we see is gauge pressure not absolute pressure
0 absolute = -14.7 psig
0 gauge = +14.7 psia
Richard
FollowupID:
656220
Follow Up By: River Swaggie - Sunday, Oct 25, 2009 at 02:32
Sunday, Oct 25, 2009 at 02:32
***Pressure we see is gauge pressure not absolute pressure***
So what pressure was it after Indian Takeaway tonight Richard ???,Didnt feel like any of those...
**Still Getting There**
Yeah so am i ..Never again.
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Follow Up By: Robin Miller - Sunday, Oct 25, 2009 at 07:26
Sunday, Oct 25, 2009 at 07:26
Petrol pressure is as Stuart says, in low thirties for fuel injected petrol patrols like
mine.
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656229
Follow Up By: howesy - Sunday, Oct 25, 2009 at 10:40
Sunday, Oct 25, 2009 at 10:40
40psi sounds about right for a petrol.
A std XR8 runs 2.8bar (just over 40psi)
Some run higher like the AU3 Pursuit (4.3bar or 62psi)
I doubt there would be many petrols running over 70psi
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Reply By: qubert - Sunday, Oct 25, 2009 at 11:47
Sunday, Oct 25, 2009 at 11:47
new caterpilar diesel run at 65 thousand ( 65000) psi
AnswerID:
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Follow Up By: qubert - Sunday, Oct 25, 2009 at 11:52
Sunday, Oct 25, 2009 at 11:52
and remembering that a centre fire rifle runs at about 50000psi. impressive
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Follow Up By: River Swaggie - Sunday, Oct 25, 2009 at 13:49
Sunday, Oct 25, 2009 at 13:49
Hiya qubert
Thats for sure, amazing..
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