| Author |
Message |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 3:17 pm: | |
How would a fella go about figuring how many cubic feet of air an engine uses? Do you just multiply cubic inches of engine by rpm and convert to cubic feet to get cfpm? |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 3:30 pm: | |
heavens no....."WE" are useing presureized (SUPERCHARGED) air |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 4:18 pm: | |
also ...other varables are air temp. (cooler= more dense air)and...altitude....my dragster would run LOTS better at sea leval than at 5000 ASL |
gusc
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 5:18 pm: | |
Nick,
I think the Detroit engine manuals list the cfm capacity of the blowers at given rpms. I'm away from home now or I would look it up for you.
It may be under the engine section of the bus manual but I doubt it. The engine manuals are very thorough. |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 6:36 pm: | |
so I need to figure in boost pressure, which would figure cfm (from above) times pressure?
I'm trying to see if I can put some sort of fan to pump air into my filter thus increase pressure in front of the filter and there for filter more air and bring the air to the turbo at a higher psi so the turbo can compress pressuriezed (although slightly) air and maybe put more air in the cylinder i.e. better mileage/power. I'm figuring this for my truck 7.3L stroke, fuel pump and muffler off the bus so it's not on the front burner at the moment. |
Don/TX
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 7:45 pm: | |
Heck, put a pipe to the top of the bus with a scoop in it, the faster you go, the more pressure you get!
Used to work great on the old 30's and 40's cars, we would run a hose down to the grille area. |
Jon W.
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 8:21 pm: | |
The air that goes through the engine is a function of the fuel consumed.
Find out the ratio of fuel to air, and you can easily calculate the answer. |
Tom Caffrey (Pvcces)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 26, 2005 - 11:55 pm: | |
Not in a diesel, unless you're just figuring on full load!
Tom Caffrey PD4106-2576
Suncatcher |
DrDave
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 27, 2005 - 8:10 am: | |
You need a Banks turbo system for that Ford and a tuner if applicable. Those old 7.3 "HayBailers" will run forever at 210 h.p. if you feed them good air and fuel.
The engineers have done their homework on the 7.3's already. |
Kyle Brandt (Kyle4501)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 27, 2005 - 8:22 am: | |
snip "I'm trying to see if I can put some sort of fan to pump air into my filter thus increase pressure ......so the turbo can ....put more air in the cylinder i.e. better mileage/power."
Compressing air takes energy. Where do you plan on getting this energy? Electric is an easy source, but carries an lack of efficiency price. Belt driven carries a price of the mechanical drive. Exhaust driven is the most efficient.
So put on a bigger turbo if you want to put more fan capacity on the air intake (but you may loose some low speed response).
BUT, have you looked into a larger after cooler? They remove the heat put into the air by the compressor (turbo) thereby allowing more air into the cylinder. They have no moving parts to wear out and there is very little cost if any to maintain. Also if you put in a larger air filter, you should get a lower pressure drop to the turbo. Another idea, what size is the exhaust system? Around here some guys are running 5" dia dual exhaust on the turbo power strokes with no muffler (and they are quieter than the dodge cummins!)
Also, have you considered increasing the pressure on your wastegate to get more boost?
ANYTHING you do to increase power output will have a price, some cheap, some expensive, most hidden (like the blown-up transmission, sheared driveshaft, or broken differential gears).
Been there, done that, bought the hat & t-shirt (twice!)
Kyle4501 |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 27, 2005 - 10:02 am: | |
I'm planning on putting the banks system on it when I get my pennies saved but it's gunna run me around 5K for the system, exhaust brake, torque converter, and trans module not to metion I don't have a good place to work down here. The money however is the issue now. I'm just trying to figure the best way to get a little better mileage out of it till then. Heck I'm getting 17 in town and about 19 on the road now, almost as good as the sticker says on a ranger!!!!!! |
Drdave
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 27, 2005 - 6:33 pm: | |
Nick,
You said: "Heck I'm getting 17 in town and about 19 on the road now, almost as good as the sticker says on a ranger!!!!!!"
I have a 96 model E250 Ford Van, The best that I can drag out of it is 12 mpg. 4.9 liter (300 cu.in.) Straight SIX banger, Fuel Injected.. What a waste! I guess I will have to trade it in for something with bigger engine to get that magical 14 mpg that Ford says. If you are getting 17 be happy !!!! |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 27, 2005 - 10:11 pm: | |
I am happy but I'd be happier with 19 in town and 22 or so on the road or better. I put a banks and my Dad's cummings he get about 24 empty on the road and about 19 with a 24' goose neck |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 28, 2005 - 9:51 am: | |
Kyle4501.....love that phase "Been there, done that, bought the hat & t-shirt (twice!)"...LOL!
"twice" is just the beginning. LOL!
Have a Great Day!
Sojourn for Christ, Jerry |
Kyle Brandt (Kyle4501)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 29, 2005 - 8:01 am: | |
Jerry,
My Granddad was a mechanic and the BEST advice about machines I ever got was from him. 'If you're going to change something from stock, then you had best UNDERSTAND why the manufacturer did it the way they did & not your way.'
During the time of the second 'hot rod', I began to understand that statement. The engine was so strong, it was murder to anything behind it in the drivetrain, but it was a real 'street sleeper' (smooth idle, quiet exhaust, & 1/8 mile = 7.10 seconds @ 100+mph on street tires and full exhaust).
Ahhhhhh, my mis-spent youth.
Where does the time go?
kyle4501 |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 29, 2005 - 8:34 am: | |
'if' you are getting that kind of mileage...the very best advise...is,do not mess with it... |