The particular legendary 5. 9L Cummins small brother, the 4BT Cummins motor has long been maligned in the performance market. After all, the engine is only 3 or more. 9L, how stout can it be? Properly, we’re here to tell you the solution is: very stout. Richard Dark brown, of Brown’s Diesel in Riverdale, California often marches to the defeat of a different drummer, so when this came time to replace the alcohol-burning 408ci Chevy in his 3-window sports coupe, he thought why not a diesel powered?

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A 3. 9L 4cyl Cummins known as a 4BT powers Rich Brown’s 3-window ‘32 coupe. It isn’t really just any 4BT however , since the mill has churned out 549 rear-wheel horsepower on 75psi of improve, and 740rwhp when nitrous plus water-methanol are injected.

The problem was a 6BT (5. 9L) Cummins was just all incorrect for the application. It was too heavy plus too big dimensionally, and ‘32 Fords aren’t exactly known for extra room. So , a 4BT Cummins obtained the call. Like many projects, Richard’s Ford took on a life from the own. Originally starting with a 263-hp turned up stocker, the 4BT transferred the 2, 900-pound coupe along pretty much. After a while though Richard kept adjusting and turning up the coupe a growing number of, and eventually windowed the stock prevent. The next engine would be a full create.

Built Up 4BT

The particular team at Brown’s started out having a stock block, that was equipped with the Gorilla girdle, ARP 625 mind studs, and a fire-ringed block plus head. The crank was manufacturing plant, but the rods were from Carillo, and the engine received forged pistons from D& J Precision Machine . To assist get the airflow moving, a camshaft from Hamilton Cams was set up, along with pushrods and valvesprings that will bump the valves in the stock cylinder head. The long block can be rounded out with trick tappet and front covers from Keating Machine .

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A big area of the 4BT engine’s power comes due to plenty of fuel. A Scheid Diesel 13mm pump capable of a whopping 800cc is fed by a 200gph Airdog 4G high-pressure lift pump, then sends the fuel to big 5 by 0. 025-inch injections also from Scheid.

Fuel

Richard knew the particular small-displacement engine would need help producing power, so he went along with every trick in the book–and after that some. He started with a 12mm shot pump and some 5 by zero. 018-inch injectors, but has considering that moved up to an 800cc 13mm pump from Scheid Diesel with an adjustable gear and massive five by 0. 025-inch injectors. Given that this is a heck of a lot of energy, Richard built an equally severe turbo system for the car.

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The Cummins operates the type of compound setup that is used upon traditional high-horsepower diesels, but the turbos had to be downsized. The smaller of the 2 turbos is a 57mm S200, as the larger is a 69mm S300, each from BorgWarner . Brown’s made the trick custom made piping in-house.

Surroundings and N2O

The 4BT is a smaller engine, so the turbos had to be sized accordingly. Keeping this particular in mind, Richard went with a 57mm S200 and 69mm SX-E S300, both from BorgWarner. Together, the particular turbos combine to make a whopping seventy five psi of boost. In addition to the increase, Richard also runs both water-methanol injection and nitrous on the 4BT, and quite a lot of both. The nitrous oxide comes in four stages–a 0. 035-inch spool jet, followed by three zero. 080-inch jets that are ramped within via Hobbs switches between levels as boost increases. The water-meth is also ramped in, with 2 nozzles feeding the intake car horn.

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Part of the cause a 4BT was chosen has been because of how easily it changed into the frame. The factory-style motor mounts could be used, it removed all the steering and linkages, and also the throttle linkage and rad from the small-block could be re-used.

Power Transmission

It might be “just” a 4BT Cummins, using a full-manual race valvebody having a transbrake from Goerend Transmissions , the automated behind the 3. 9L would have to be plenty stout. Luckily, Richard is really a transmission builder, so he understood exactly the direction he wanted to proceed. In addition to the valvebody, the 47RE-based tranny was fed stronger 48RE internals, as well as aftermarket shafts from Sonnax and TCS . The converter was a minor mystery, since the smaller Cummins motor made a lot less torque. In the end, these people went with an experimental triple-disc converter from Goerend that allows for extremely hard transbrake launches.

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An intercooler was put into the compound setup in this awesome front-mount scooped location. It helps to keep intake temperatures and boost challenges from going stratospheric.

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We were surprised to understand that Steed Speed made the steel 4BT manifold, but they perform. The manifold helps with both circulation and durability on the little Cummins and it is equipped with a 45mm wastegate.

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Since the wheels hang out in the breeze, there’s simply no room to skip on rubberized. The rear street slicks that give the particular hook are 33×16-inch Hoosier Quicktime Pros. Front skinnies are installed on Weld Racing wheels. They endure to the weight of the diesel great.

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Richard’s ‘32 isn’t a polished display car, and it’s not a verweis rod either, but it does have a few rat-style touches, like this dipstick owner wrench.

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Cummins 4BT engines weigh about 750 to 800 pounds, which usually actually isn’t that much heavier than the usual small block with a blower. This particular meant the entire front suspension can remain unchanged.

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Front skinnies are installed on Weld Racing wheels. They endure to the weight of the diesel great.

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The particular rear-end is a very strong fabricated 9-inch with 3. 40 gears, forty spline axles, and a strange spool. It’s hung with Varishocks through Alston’s Chassisworks , and features a ladder-bar back suspension.

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The Avoid -based four-speed 47RE had been used because of its simplistic nature, also because it has an Overdrive gear along with a lock-up converter. This keeps the particular turbos spooled and diesel in the powerband at all times. Overdrive and lock-up are on simple switches that Rich hits while going down the remove or street.

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The intake horn over the ‘32 is quite a busy place. With four nitrous lines plus two water-methanol lines, we’d like to see what’s happening inside that will intake manifold!

This post was originally published on this site

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