I can see 5-10 years bringing diesel up another 10% market share in europe and maybe even 20% extra share in US. Then we will also have almost all new SI cars having fuel systems to cope with bio-fuel substitute in the dinofuel. This will pave the way for a greater subsector of the main...
The main damage would be loss of sealing and bad spray at the injector tips, possibly sticking issues as well.
Yes i agree its a common misconception that the ethanol chemical itself will deteriorate the metal parts of the injector, but rather that as methanol is hydrophillic its the water in...
like a dog with an old bone, i just cant leave it alone...
We ARE talking about a speed vs torque plot.
If you agree with the fundamental reasoning behind the fact that the diesel will make more instantaneous torque at lower rpm, and that you agree with the fact that diesels will make more...
Ok, that was my second to last.
Ivymike, you are just plain not reading the words on the screen.
V2 is the BDC piston position. If the pressure is higher toward that end of the diagram, then the combustion event has kept the pressure higher, later in the stroke. But thanks for totally...
Steve,
I beg your pardon - am not confused! Please re-read my post that you replied to for the answer to your last post. I can clearly see where you guys have hit a brick wall in terms of relating the now used terms of p and e-torque. I understand you wish to stick to your guns in terms of...
I dont beleive they will. The work done on the piston by the gas is converted into the plotted torque line by multiplication of the distance of the acting force to the crank centreline. The PV diagram shows the amount of work done on the piston, but not the timing of this work essentially (the...
JSteve,
Just because the automotive world confuses the engine torque with the phisical torque exerted on the shaft does not give an answer to the OP in my opinion.
Imagine the case of a one cylinder diesel engine, how would you explain the higher torque there compared to SI?
If we had a one...
Maybe you could slave another throttle actuator from the same control signal? (assuming the ECU can handle the extra load).
You could use a very lightweight plastic moulded 'throttlebody' at the airfilter controlled by a second throttle actuator, it would only have to be slightly bigger than...
Somptingguy:
The integral is just the area under the curve as already mentioned a few times in the statement that the pressure is held higher for longer over the whole cycle than in an SI engine... Nothing new there! If you are considering the PV diagram, how do you assume you translate that...
Well done guys for answering the question! I knew you 'real' engineers would get it right away!
What is wrong with using the term 'leverage' to illustrate the condition at any one time window pray tell? Is the answer to the question fundamentally flawed?
And of course the dyno will cycle...
Just to illustrate the point:
As the piston descends in the combustion stroke, the angle of the connecting rod and big end relative to the crankshaft increases. Resolving forces shows that the push on the piston will generate more torque up to the point when the piston is half way down the...
I saw a couple of videos of the VW G60 engine fitted with the Lysholm SC. Those things are REALLY loud. How loud was the previous setup with the twinscrew SC post TB Steve?
I think you could tune out the noise in the transitionary period with careful sizing of the pipe to the intercooler for...
Yes the optimum CR for diesels for power is around 15:1. This has been shown over and over again. Most new DI diesels have a CR of 18:1 or even less. The higher 20:1 ish compressions were simply to get IDI engines to start, at the expense of some losses due to the reasons hemi mentioned - it...
Steve,
I was thinking that you could possibly tune out the noise in the transitionary period using a tuned length of pipe running up to the intercooler if it is close enough. May I ask what is the exact model of SC that you are using?
Tmoose
The noise from this SC is produced at the exhaust...
Steve,
Interesting, I hadnt considered the expansion scenario. Maybe then a tuned-pipe solution immediately at the SC exhaust to cover the transitionary period would work in this case?
Also, the correct placement of the intercoler will go some way to providing a plenum style voulme which will...
