k-claw71 Posted September 16, 2015 Report Share Posted September 16, 2015 Hi guysJust joined as I have a problem with my 1.7sdi lupo. Me and a friend did the conversion all last week and got it running Sunday. Started up first time so I jumped in but after about 2 miles it started to bog and even with my foot to the floor it still wouldn't run.Any way my mate can't find any thing wrong, any advice? Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 16, 2015 Report Share Posted September 16, 2015 LOL, sounds like you just put petrol in a diesel to me.But ok, you changed the engine, but what else did you change? What else didnt you change? Things like the fuel tank, or in tank pump?Question: Why?2nd Question: How? what did you do?also, going from your OP it sound like you fired it up and then immediately drove off around the roads, why not leave it running on the spot for several minutes at least while double checking you havent forgotten anything and to see what it does? Quote Link to comment Share on other sites More sharing options...
Skezza Posted September 17, 2015 Report Share Posted September 17, 2015 Wow you put an SDI in something ? What was the donor car?Does it turn over? It sounds like potentially air in the fuel lines to me. Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 Ah I don't think I explain well enough, we converted it to run on petrol.My mate fitted spark plugs and some pump as it needed more fuel pressure and I drained and refilled the tank.Not sure if the diesel in the lines has done some thing to the plugs? Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 (edited) Wait, what?it's an sdi engine you have converted to petrol?or you put a petrol engine in the sdi car?because there's a big difference between those two...But i still have to ask, why? Edited September 17, 2015 by Sausage Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 We converted the 1.7 to run on petrol.It was cheaper declaring a fuel change to insurance than a engine swap. It felt much quicker when it did run, guessing I've got a 50 bhp increase easy Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 So, fuel delivery and metering is achieved how?Compression ratio is over double that of a petrol engine, how are you controlling pre ignition and the resulting melted pistons or other damage?How are you delivering and timing ignition?I would think if you are able to make this run for several minutes then you are able to trouble shoot it and work out the problem, after all there is a mountain of tech problems that you have had to resolve to do this already isnt there?It's probably used all the diesel in the lines and filter and then burned petrol until it died. Not sure why you declared it until you'd tested it properly tbh. Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 This is the dumbest thread I've seen so far here btw. well done for that. 2 Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 apologies for the last post, I remember being young and enthusiastic too and trying some crazy stuff, some worked some didnt, like putting a 1275 head on an 850 mini engine when i was 17, it ran like a dog because i'd just decreased the compression ratio with the big combustion chamber on the 1275 head (doh). The sheer effort of making a diesel engine run petrol is not worth bothering with, they are fundamentally different. One is a compression ignition engine the other is a spark ignition engine.If you wanted more power from the sdi with undeclared mods, you probably could have messed with the pump fuelling and run 5% petrol in the diesel fuel to boost it a bit. Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 We have added a extra pump (lift pump? ?) At the tank to supply to main injection one. Then my mate did something with the glow plugs so they do the spark plugs job.Didn't bother with the compression or any thing as should be fine as is. Quote Link to comment Share on other sites More sharing options...
Skezza Posted September 17, 2015 Report Share Posted September 17, 2015 You've got glow plugs running as spark plugs?Dblock is going to love reading this Quote Link to comment Share on other sites More sharing options...
Silver! Posted September 17, 2015 Report Share Posted September 17, 2015 Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 Wondering if maybe fitting a lambda sensor of a petrol engine might solve the problem? Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 This is a troll thread right? You cant be being serious here? Are you one of the Chuckle Brothers? Quote Link to comment Share on other sites More sharing options...
Dblock Posted September 17, 2015 Report Share Posted September 17, 2015 This is super hilarious. But also really interesting. I really hope this is real as to get it running at all is pretty crazy. Anyone know what compression sdis run? Quote Link to comment Share on other sites More sharing options...
Skezza Posted September 17, 2015 Report Share Posted September 17, 2015 Do you have some photos? Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 17, 2015 Report Share Posted September 17, 2015 (edited) 19.5:1i thought it would be a bit higher LOLThe diesel pump will disintegrate after having petrol thru it for enough miles as it needs the diesel for lubrication, so that is a non starter using that for fuel delivery.Edit: I was going to say the same thing, pics or it didnt happen.... Edited September 17, 2015 by Sausage Quote Link to comment Share on other sites More sharing options...
carrera-gt Posted September 17, 2015 Report Share Posted September 17, 2015 HmmmLet me see if i've got this right.You and your mate added a lift pump to an SDI ( Suction Diesel ) then bypassed the timer so the glow plugs are on all the time, then drove it 2 miles on a mixture of Diesel and Petrol, when it stopped1/ Diesel pump hates petrol seals etc and it can't inject enough petrol to get a mixture that will burn in the cyclinder anyway2/ glowpugs are designed to work for a few seconds no more so they are probably burned out.I hope this is wind up, if not you and your mate are too dangerous be alllowed anywhere near mechanical things Quote Link to comment Share on other sites More sharing options...
Skezza Posted September 17, 2015 Report Share Posted September 17, 2015 I really do want to see this. Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 We already though about the pump, we are running two stroke oil to help it. Pumps fine and we added the extra pump so it can meet the fuel demand.Glow plugs arnt on all the time they fire intermittently like spark plugs.I'm pretty sure this is just the diesel lambda not being set up for petrol Quote Link to comment Share on other sites More sharing options...
Pete Posted September 17, 2015 Report Share Posted September 17, 2015 It's not possible to make them operate the same as spark plugs. This is definitely a wind up. Quote Link to comment Share on other sites More sharing options...
k-claw71 Posted September 17, 2015 Author Report Share Posted September 17, 2015 OK well we are going to have to agree to disagree, once I have it running again I'll do a video showing it but atmosphere I need help sorting it, my mates pretty much given up now Quote Link to comment Share on other sites More sharing options...
Dblock Posted September 17, 2015 Report Share Posted September 17, 2015 can i ask why? Quote Link to comment Share on other sites More sharing options...
Dblock Posted September 17, 2015 Report Share Posted September 17, 2015 It must be detting like mad surely? Quote Link to comment Share on other sites More sharing options...
Pete Posted September 17, 2015 Report Share Posted September 17, 2015 Exactly that, sparks are there to ignite at a specific time, glow plugs don't go hot/cold/hot/cold quick enough to ignite the fuel at the right time, Itl be totally random, no wonder it runs like a bag of bolts. Quote Link to comment Share on other sites More sharing options...
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