petrol in a diesel car

diesel is injected before the compression stroke. on older derv they had swirl chambers before the inlet valve. simply the compression/heat ignites the fuel nothing more. tones of compression is also needed as a diesel creates no vacuum in the engine as it as no throttle body. air isn't drawn in like on a petrol engine. dt's tho have other ways lol

petrol needs a spark ideally.
 
just a bit of useless info, in colder climates truck drivers mix small quantities of petrol or similar in there diesel tanks to stop freezin
 
err no i knew it before that but i do like that show.

and petrol strips the diesel from the seals (they rely on the diesel to lube em) unlike a petrol that uses the oil
 
Mark yeah I've heard that a adding a small amount of petrol to the mix is supposed to improve performance, something to do with higher octane, but I've never put it to the test.

Paul I guess it's done by injecting more fuel and raising boost on a TD. Diesels are much more about fuel than air compared to petrol engines. A diesel engine just sucks in the air it can throughout the rev range and mixes amounts of diesel based on throttle position. Often there is excess air exhausted as diesel just needs air to be there rather than be too sensetive to AFR. Also yes, it's the high compression of the air and fuel that causes it to go boom, like you said the air gets hot under compression.

My engine is 18:1 compression. Pretty high so I'd imagine petrol doesnt react too well to that :lol:
 
me too lol

wow no wonder its taken diesel engines a while to catch up with petrol, they are quite different :)
 
i would of thought the little amount after mixing would do little damage if any i wouls sugest changing fuel pump and filter. also just run lots diesel through it before going to a garage because a garage will just see ££££ and do alsorts to it. if stil no better then take it to a garage. hope this helps and hope it doesn't cost you too much.
 
yep on petrols foot down, more air, then more fuel = bigger bang, revs go up off we go.

derv foot down more fuel, rev go up a bit, turbo adds the air = air/fuel mixture go up revs go up and off we go lol. that why even on new DCi, TDi, HDi etc etc you see loads of black smoke (unburnt fuel) before it gets going.


david
 
That theorey only works on turbos though, what about N/A diesel? did these come with throttle bodies otherwise how would it create a pressure difference to draw air in?
 
still no TB fella, it'll still draw in air, not gunna run out of the stuff lol. however thats prob wht there so slow haha

this is what we at work ask of garages that have a misfueled lease car;

hi, Please confirm if the vehicle was started and if the manufacturer instructs any guide lines to repair a vehicle that has been miss-fuelled? We would wish these to be adhered to. If not please quote for & perform the following checks which are in line with our minimum expectations: Drain/Clean the fuel tank; cleansing of the fuel lift pump/tank unit; cleansing of all fuel lines & sediment traps; replacement of all fuel filters; replenish tank with fresh diesel, min of £5.00; fuel flush/additive; minimum 10 mile road test


dd
 
id say 2lts of petrol in 40 ltrs of diesel wouldn;t do any damage..

Id imagine the problem is unrelated and elsware..
 
the best idea would be buying and installing misfuelling prevention devices i was in a similar situation a while back and got into trouble now after using the device i am out of problems.
 
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3 litres into a full tank of diesel is nothing really. I'd change out the filter, fill her up and chuck in some redex (diesel of coarse!) to clean the injectors. If you'd run it on petrol for a while I'd say you'd have done a lot of damage but a drop in the diesel won't really do alot. May be worth whipping out the glow plugs and check for damage. If the problem persist get the fuel pump checked out. If you do take it to a arage make sure they check the fault codes out to identify the problem, if there are any.
 
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