How much horsepower does a 4Bt produce? And how much better economy does it get than our 6Bt?

Would a 4Bt fit in out trucks using the same transmissions?

Has anyone ever cut the fuel to maybe 2 cylinders letting them pump air and run on the remaining 4?

A solenoid could bleed the fuel back to the return.

I remember a car in the late 70's that was run on the dry lakebeds that a Cummins engine with half of the cylinders cut out.

This is done on gasoline engines all of the time.

Just wondering.
Jim

 

I think HP varies...I've heard of 70hp applications, and at work we have self-propelled sweepers (brooms) with 110hp 4bts, and i worked on an asphalt paver that had a 115hp 4bt. So just like any other application, they can be up/de-rated.

I would imagine they would use the same trans, isnt there a guy on here with a ranger/4bt/getrag combo or ranger/4bt/zf? Most of my experiance with 4bts consist of the motor bolted to a large hydraulic pump....no trans.

 

Automotive versions start out at 105 hp with around 285 torque with standard Cummins factory fuel/air calibrations. Theoretically by using factory calibrations and two less cylinders you could see about a thirty percent increase in efficiency. In round numbers at 26.6 HP per cylinder 105 HP in a four cylinder Cummins is the almost same as 160 HP in a six cylinder engine.

The rear accessory mounting pattern of the 4BT & 6BT share the same pattern so whatever bolts onto the bare rear section of the engine block will interchange provided you use the complete set of components.

The 4BT as designed has inherit vibration issues. Removing two additional cylinders in the firing order would probably render it uselessl.

 

In boats they are running 150 horse power with a turbo. I once worked on a natural 6b in a sweeper and that was rated at 105 horsepower. The new 6b's in a boat are rated from 235 up to 435.

 

Just cutting fuel to two cylinders will increase fuel consumption because of the pumping losses.

The commonrail engines have a "warm-up" mode where they run on 3 cylinders when idling after a cold start in very cold weather, using the pumping load of the dead holes to load the working cylinders harder so the engine will warm up faster.

Gasser setups (like the Hemi with MDS) control the valvetrain to hold the intake valve closed to minimize pumping losses. The ill-fated V4-6-8 Caddys used solenoid valves in the intake manifold runners to accomplish the same thing (oh, that worked real well with a fuel-wet manifold and EGR ). I don't think this would work as well with a turbodiesel because there is much more pressure in the exhaust manifold than on a nonturbo gasser.

A 4BT in a 1st gen would get better mileage and could be tuned to deliver equivalent performance up to a point. You'd be better served to convert a 1/2 ton gasser if it's just for DD/light hauling duty, the lighter truck will provide better performance and economy. Plus it'd be a sin to neuter your awesome dually.

 

Speaking of 1/2 Tons - this fellow is getting over 20 MPG in this 4WD Dodge with upgrade mods.

Cummins 4 cylinder diesel in 1985 Dodge Ram. Running with HY35W turbo and Bosch 190 injectors. NV4500 tranny and Duramax clutch. Fuel turned up and pump advanced. Peak torque on this run was 363 ft. lbs. at the wheels and 181 h.p

http://video.google.com/videoplay?do...261&q=4bt+dyno

 

hey jim, ill have some numbers for you soon, ive just got the mounts finished for my 1963 ****** j-200 pickup -4bt- swap, the earlier driveline fabs include 3.54 ratio danas, 203/205 gear doubler, sm 465 trans with a 1-1 final drive, with the 366 spring and 35" tires, i should get 75-80 mph, leaving a cruise of 65 mph, i hear lighter trucks getting 25mpg around town, well get some pics, and post with numbers, coming soon, 1982 gmc jimmy, original 6.2 diesel, rare, with hydroboost, and the first 700r4, swaping in another 4bt, this will be dads toy, joe.

 

A couple of counties over, there is a guy that hauls custom church steeples all over the world.

These things can be extremely long, often-times requiring two or more trailers to accomodate them; but, the weight is next to nothing, being just a big hollow aluminum core.

He has several 50'-plus goosenecks.


Long story short, he had a Dodge ton-dually get stolen.

When they found the truck, engine/transmission/etc. were gone.

He had a P-pumped 4BT on hand, so that got installed in the truck.


Seat of the pants, it feels as quick and powerful as any of his other trucks.

 

got a toyota landcruiser that I'd like to put a 4BT in...

where can 4BT donors be found?

 

Frito lays chip trucks.

 

At work we use 125 hp 4bt's in paving equipment. They do shake quite a bit at idle, but smooth out above that.

 

I second the smooth out over idle. My uncle has one in his 32 foot lobster boat and under power it goes great.

 

They couldn't shake much more then the Buick 231CI Odd Fire.

Don't they also have them in the Sprinter Vans?

Quote:
At work we use 125 hp 4bt's in paving equipment.

Vibratory Plate?

 

from my basic calc's and from the ones ive built you can get 1.34 hp per cc, we put it in a old jeep truck and put down like 400+, i have to dig up the dyno slip, but ran into some problems because we put a quadra trac in the truck, but it will fry all of the tires through 3rd gear and with a valet switch gets like 30 mpg.

 

no the sprinter vans use mercedes diesels.