AccordX2Boost

ok, I know this is not honda, but neither is the front page news.......I have recently aquired a 1984 Mercedes 190d (deisel). it is a 2.2 ltr n/a engine. Am I correct in assuming that If i build the manifold, and get everything hooked up, all i have to do, for fuel dilivery is turn up the fuel injector pump, right? my other questions are as follows; 1. how can i possibly tune the a/f ratio on this, (do i have to just go by how much it smokes) 2 if i am trying to maintain higher fuel miliage, should i use an intercooler for say aroung 6lbs of boost? Thanks.....

When I get this going I will post pics...

Smith-02

you can't lean burn a diesel. they regulate the a/f itself

mike94se

Don't diesels like detonation?

McBoost

Isn't hard to detonate a diesel? My parent's turbo deisel has a static CR of 18:1... crazy. But then again, it uses that high compression for it's explosion, no spark plugs.

kamilk69

honestly you cant really tell a/f buy how much it smokes, that like tunning a gasoline car by the smell of the exhast. the key to diesels is injector timing, a diesel dosent inject on the down stroke it injects fuel the split second before tdc. and my dads turbo diesel has cr or 22:1 ------- insane

AccordX2Boost

ok, that's what i needed to know how do you come up with the "cr" (what does that strand for? combustion ratio?) 22:1?

I have heard that if a turbo deisel is smoking that you need to turn up the boost until it doesn't smoke (much) but I am not a deisel expert. (so that's where that comment came from)

also, i know that they run lean anyway because of the high compression, but i just want it to be reliable and get good gas miliage, while having a little more pickup than stock. (like 80hp) so i am not trying to blow the engine, or race the car. I want somewhere around 120-130 hp. i'm thinking that 6lbs of boost should do the trick, but would i need an intercooler? if I don't really need it then this would be much easier.
also being an automatic should i still put a blowoff on this setup, i've heard that you don't need it on deisels, but that don't really make sense to me.

Thanks for ya'lls imput/help yo

Smith-02

industrial CAT motors bolt the compressor housing to the intake directly. and that's like 50psi worth of boost.

once you get your injector timing and ---- set, you should be able to run whatever you want for boost. diesels don't NEED boost, but their poor natural vacuum makes the demand for boost much higher (and funner)

DrSeuss

Ok, diesels use compression ignition. They operate at compression ratio's of 20:1, they have no throttle plate, regulating their power output by the amount of diesel injected.

By using a turbo charger, it is possible to force more air into the cylinders and therefore allow more fuel to be burnt. It also ensures more complete combustion of the fuel.

Intercooling is always a good idea, it increases charge density.

Since diesels have no throttle plate a blow off valve does absolutely ---- all.

The major item on your shopping list should be an FMU, sounds odd but most old skool mechanical injection diesels increase fuel pressure when in boost to get more fuel in. Tuning is a case of getting the boost to where you want it (mostly where your turbo is efficient) and making sure its just below the point of smoking.

The turbo choice for diesels is one i don't know enough to discuss, but i used to help mates tune peugeot diesels, which are just tractor engines.

ryan89crx

i work at CAT, and have never seen that...

maybe on VERY few of the oldschool stuff, but not the new. 90% of the new CAT equipment comes intercooled, the rest still have traditional tubing, couplers, and clamps up to the motor

norbi

fuel is injected into cylinder at 500PSI or so (newer have even 1200PSI) - FMU is useles here.
There 2 pumps - fuel pump and high pressure pump that injects the fuel thru injectors, all is mechanical unless it is pretty new diesel with common rail or with injectors that are high pressure pumps itself (those inject fuel at 1200PSI). the only way to tune fuel in diesel engine with mechanical injection is to increase capacity of each injecting cel in high pressure pump. There is one cel for each cylinder, there are inline and roto high pressure pumps. Injecting punp works like 2-stroke engine and putting in simple words the injector is an echaust valve but opened by the high pressure of diesel fuel.

if you want boost with not installing fan get some gasoline with diesel fuel in your tank - your car will rock, but engine won't last long

One more ting - if diesel smokes it doeas not mean it needs boost - the injector is worn and it is not spaying fuel good enough - actually it is leaking.