482/496 FE Shelby Street Crate This is my Engine A masterpiece of size and power...8 litres One problem, after shut down I am dieseling profusely. must leave in higher gear and stall with clutch after key goes off.. There is no Pinging, I am on 93 octane pump gas. no strain on uphill of lugging..actual runs perfect , just I think the pipes go yellow after shes lean and hot.. It does have an advanced cam...the idle is wicked...like a funny car!! Funny I was out last weekend and oil temp would bottom out in motion with all the coolling the radiator and oil cooler provides.. Just upsetting to have to kill it with gearbox each drive.. What to check first Have not ran a full tank through yet..might be old gas.. Image Unavailable, Please Login Image Unavailable, Please Login
Are you sure it's dieseling and not a problem with the ignition system (not turning off with the key)? I'd start with answering the question above and then check the timing.
Dieseling is a very Recognizable symptom, and the Carbon monoxide smell will kill you.. its dieseling.. there is a master battery switch in the cabin , I will try to shut down with that to check your point, Thanks
Damn, that is a beautiful car and engine. I wouldn't worry about it, just be gentle with the clutch when you shut it down. I have two Cobras, one with a Ford 521, the other with a Ford small block 427 and webers. I have to pop the clutch (gently) when I shut them off so they don't diesel. No problem, I'm used to it and it shuts down smoothly, no pop or jerk. I also usually turn off the fuel pump (I have a switch) 30 seconds or so before I shut it off, but that's mostly to keep the carbs empty to reduce the gas smell when I park the car in the garage.
The car isn't running hot? Usually see it happen when the engine gets really hot, and with the carb continuing to pull fuel in as long as its detonating. I would try to find the issue, it may be a side effect of a bigger issue. I know that's not a cheap engine.
Another solution would be to install an idle solenoid, such that when you shut off the ignition, the solenoid closes the carb valves further past the open idle setting. If you have an MSD box, then there is a wiring a solution which kills the spark immediately: http://www.msdignition.com/page.aspx?id=3296 Good luck, Randy...
What does this mean: "Funny I was out last weekend and oil temp would bottom out in motion with all the coolling the radiator and oil cooler provides.." Are you implying the temperature is showing low on the instrument gauges? Believe "dieseling" has nothing to do with the car's ignition system providing spark to the plugs, but a condition where the tops of the pistons or other components/contaminants (valves, spark plug tips) remain hot enough to provide a source of combustion under pressure. Further, have been lectured in the past that this condition (dieseling) can have serious consequences to the engine components, e.g. damaging the pistons and the rod bearings (because oil pressure under these circumstances (the same as lugging the engine) is very low and most likely will not provide the needed cushion of oil between the rod bearing and crank shaft surface which will lead to flat spots on the bearing surfaces.) Would check all levels of cooling fluids. Would not believe the instrument gauges in the car and prior to shut-down at the perceived OT, take a temperature reading with a IR gun to read temperatures and base these readings against what the temperature most likely would be under normal operating conditions. (My guess for this car the normal operating conditions to be somewhere between 180-210 degrees F). Next, if the above checks out for temps/fluid levels, dump the fuel from the car and get some Aviation Fuel (not recommended if you have catalytic converters in the system) where this fuel is 100 Octane Low Lead. Available from any of your friendly local municipal/county airports. Use this fuel in all my big block and high performance small-block cars. Clearly, these are all vehicles that have no emission requirements. Use of this fuel, although expensive, makes a world of difference in start and overall performance. Great car BTW. DJ
Theres my answer, Thank You, Yes, Toggle switch is on dash for fuel supply.. Cant diesel if there is nothing to ignite.. actually that happened once by accident... engine ran dry when I was acclamating myself to car.. I think racing gas 100 octane will be the answer long term, I think Timing is spot on.
good points, ( no Pun ) Actually this past weekend on Sunday the outside temp was 35 degrees.. went for a long stretch at 45 to 60 MPH..the oil cooler is so effecient that I would watch the oil temp go to bottom at speed, and rise at rest..maybe sensor is up front in breeze. There is also a fan switch for the oversized aluminum water coolant radiator, I left it off as the same thing would happen..come this summer I am sure those symptoms will vanish.. cam 2 or vp makes 100 octane, will seek this weekend! Thanks for the good tips.
This is the best answer , to the prob.. Hoping to get by without this. close the butterfly when power goes off I already researched it Image Unavailable, Please Login
Real competition for the slutmobile in terms of pick up appeal. It is hard to get used to the attention that a chrome finish car attracts.. cameras come out in millisecs when I stop..very flashy...but the cool factor outweighs this drawback. You Must Wear Sunglasses when you drive this car! Actually, I have your cars sister as well.. The Kirkham is Brute Strength.. Probably the fastest 0 -60 street car in the USA, by brand. at 2200 lbs. and 620 HP... do the math. maybe the new Hennessy has better stats I want one of those next! BTW, I bought stock in Simichrompoli...b4 I got this car. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Last but not least. The Calander Shot! Gardiners bay off East Hampton this past weekend Image Unavailable, Please Login
Fantastic looker! With lots of cam, you need the carb set to move a lot of air at idle the velocity of the mix is so low-so you end up with a situation where the carb just isn't closing enough to shut it down. I think the idle solenoid will do the trick.
BTW, what did Keith Craft or the builder (if someone else finished the engine) say about the dieseling?
I have got to try this! [ame=http://www.youtube.com/watch?v=yvHcrCzkSl4]Destroying Ex-Wife's house - YouTube[/ame]
KC said either bad gas or Timing is too advanced. They reco 38 degrees full advance, I will drain the 42 gallon tank and replace with new..then I will check timing.. All Good, such a Beast deserves the best attention! Image Unavailable, Please Login Image Unavailable, Please Login
I suggest retuning the carb. Sounds like the throttle is a bit open on idle. If you can get it to run on the idle circuit alone, with the throttle closed the dieseling ought to stop. Alternately, the throttle solenoid is a tried and true solution that nearly every early emissions car employed. Fuel shut offs won't do a thing as your float bowls are full, changing fuel likely won't help either. Spark advance has nothing to do with it as the ignition system if OFF at shut down. Oh, beautiful car, glad I'm not polishing it though.
Most all the qualified people that I have asked are saying the same thing. Todays gas has too much alcohol. This engine needs octane. Polishing is a bit*h But the results Speak for themself Image Unavailable, Please Login
Nice car .. I would definitely take care of the dieseling it is a problem . It will most likely be corrected with better gas . I run racing gas of 100 octane or better in my big block corvettes they drive and run like a totally different car. Kind of a pain though as there is only one place locally to buy it.. from the 100 octane you can then try mixing in some 93 until you have a balance that works for you.. Also if your oil is reading low temp it is most likely a bad sender . If the water temp is running in the 180 degree or so then your oil would have to be getting to a normal temp .. Is the car clear coated or just polished alum.. looks really great..
