Ford V-6 beats v-8's in towing competition

Dargo · Jan 5, 2011

Diamondpilot said:
Glad I fly jets now also. Have not flown a piston airplane for 15 years.:licking:

Chris

Had a friend who had to conduct some business on Grand Cayman a couple of months ago and asked me if I wanted to go along with him. We left Indy airport after sunrise, ate lunch and toured this guy's "boat" docked at Grand Cayman, made a stop at a couple of banks and was back on the ground in Indy well before dark. I think it was a 250 Gulfstream, or some number like that. How freaking fast do those things fly?? It seemed like I was just finishing my snack after reaching altitude and the pilot told us we were making out decent over Cuba.

Diamondpilot · Jan 5, 2011

Dargo said:
Had a friend who had to conduct some business on Grand Cayman a couple of months ago and asked me if I wanted to go along with him. We left Indy airport after sunrise, ate lunch and toured this guy's "boat" docked at Grand Cayman, made a stop at a couple of banks and was back on the ground in Indy well before dark. I think it was a 250 Gulfstream, or some number like that. How freaking fast do those things fly?? It seemed like I was just finishing my snack after reaching altitude and the pilot told us we were making out decent over Cuba.

Was not a G250, not even out yet.... Unless it was a Demo Ride on one, they are doing that already. They will be delivering them in 2012. My friends company has ordered 4 of them. They do currently have a G200 that does Mach.85 which is about 560mph. The G250 is the same speed. They also have a G450 which cruises at Mach.88 and is about 580mph.

The airplane I fly does Mach.83 or about 545mph.

The average commercial airliner operates at Mach.74 to Mach.78 or about 490 to 515mph so most corporate jets are much faster and as a rule fly higher.

The fastest corporate aircraft on the market is the Citation X. It cruises at Mach.92 or 610mph.

Chris

dodge man · Jan 6, 2011

sld said:
One thing I know for sure is that max power is usually made with an air/fuel ratio of around 12.5:1 to 13:1.

I had a 1990 F150 with the 351. During that era Ford's programming was very rich to help keep the catalytic converter temps down. The Super chip programmer I bought did actually lean the mixture for more power.

Fast forward to my 2007 F250 with the V10. The factory programming keeps the air fuel ratio at 14.7:1 at all times and stays in closed loop. The only exception is it would richen up to cool the converter if it started heating up. The tuner I have now lets it go into open loop and roughly 12.5:1 to 13:1 and it makes noticeably more power. Goes back to 14.7:1 for steady cruise.

So, IMHO, it is a fact at what ratio makes the most power. Whether you are getting richer or leaner depends on where you started from.

The cylinder cooling effect from excess fuel plays a big role. It is not simply that you are burning more fuel and making more power. At richer than the 14.7:1 you are not getting a complete burn.

Those are pretty good numbers, but once you go full throttle, almost all modern engines will run richer, somewhere in the area of 12:1, although it varies by maker and engine. At full throttle 14.7:1 might actually make great power, but at some point that lean would start to burn valves, or heads or pistons.

slowzuki · Jan 7, 2011

At full throttle, the engine will make less power at 14.7:1 than at the richer mixture. Peak MEP occurs slightly rich!

turbo36 · Jan 17, 2011

Here is a link to the teardown of this engine.

What the Inside of a Tortured Ford EcoBoost V-6 Looks Like - PickupTrucks.com News

slowzuki · Jan 17, 2011

Thats pretty impressive. i'd live to think they did some bore scoping and compression testing before risking a live teardown like that. Could have gone badly.

Dmace · Jan 17, 2011

One cylinder was found to have a cautionary 13 percent air loss past the combustion chamber's seals, while all other cylinders were acceptable with single digits of air leakage.

Not surprised they are already having ring issues with a strung out high compression forced induction engine...
They don't say what the other cylinders had for loss but anything over 5% is unacceptable in my book. I will still take a normally aspirated V8 over this engine any day of the week.

turbo36 · Jan 17, 2011

Dmace said:
Not surprised they are already having ring issues with a strung out high compression forced induction engine...
They don't say what the other cylinders had for loss but anything over 5% is unacceptable in my book. I will still take a normally aspirated V8 over this engine any day of the week.

Where does it say ring issues????? Go back and read the article, it is leak down not compression.

LD1 · Jan 17, 2011

turbo36 said:
Where does it say ring issues????? Go back and read the article, it is leak down not compression.

It didn't specifically say ring issue.

But it did say "13% loss past combustion chamber seals"

So that could only by the valve seats or the rings. But more than likely the rings.