Mack EM6 237 to 315 horsepower?

[Victordc98]

I would like to know how to raise the injection pump of my Mack em6 237 to 315 horsepower I remember that my engine is from the year 1982 and has an American Bosch injection pump.

[Freightrain]

Takes more then turning screw in the pump.  I would already have done my 237.  You'll need turbo, injectors and intercooler.

Edited December 10, 2019 by Freightrain

[Victordc98]

thank you but could you give me a more detailed explanation of what I should do

[AZB755V8]

13 minutes ago, Freightrain said:

Takes more then turning screw in the pump.  I would already have done my 237.  You'll need turbo, injectors and intercooler.

It will take all of these parts plus someone that knows how to size the parts and do the work. Once you past 300hp piston cooling is a must to have it live. The 237 is not piston cooler equipped. 

Better to get a 300+ or a 350 and save a lot of time and money in the end.

Edited December 10, 2019 by AZB755V8

[Victordc98]

If you have an oil cooler and it also has a turbo, I will add your interculer. I just need to increase the fuel level.

[Maddog13407]

237 has piston coolers.... so does the endt673c and 673b

[Victordc98]

if I wanted to know how exactly to raise the injection pump 

[Rob]

I will get you some numbers from an AMBAC pump book today to have your injection pump calibrated to. Your existing pump will have 11mm plungers and barrels, and the existing injectors should recalibrate to match the new pump output characteristics with minor parts replacement. I will also include the injector numbers suited to the pump output you will be emulating. It is getting difficult to obtain some of the parts for the governor section, but a good pump shop can build/modify existing parts to work. If doing the work yourself, be careful following internet advise as there is much erroneous in nature posted routinely. The turbocharger would best be changed as the "mapping" of the original is incorrect for the recalibration. However, it would still work in the application.

What transmission are you running? A five or a six speed would best be replaced with a nine, 10, or 13 speed with the revamped power output of the engine although either of the aforementioned will work.

This work you are wanting to accomplish is not something you do in a bench vise with a hammer, screwdriver, pliers, and crescent wrench, but will require a fuel shop or you stand a real good chance of a short lived engine.

[AZB755V8]

11 hours ago, Maddog13407 said:

237 has piston coolers.... so does the endt673c and 673b

Learn something new today. When did Mack first start piston cooling, what year? Did this happen with the spin on oil filters? 

[Victordc98]

Hace 7 minutos, Rob dijo:

Te conseguiré algunos números de un libro de bombas AMBAC hoy para calibrar tu bomba de inyección. Su bomba existente tendrá símbolos y barriles de 11 mm, y los inyectores afectados deben recalibrarse para que coincidan con las nuevas características de salida de la bomba con el reemplazo de piezas menores. También incluimos los números de inyector específicos para la salida de la bomba que emulará. Se está volviendo difícil obtener algunas piezas para la sección del gobernador, pero un buen taller de bombas puede construir / modificar las piezas modificadas para que funcionen. Si hace el trabajo usted mismo, tenga cuidado de seguir los consejos de Internet, ya que hay muchas cosas erróneas publicadas de manera rutinaria.El turbocompresor cambiará mejor y el "mapeo" del original es incorrecto para la recalibración. Sin embargo, aún funciona en la aplicación.

¿Qué transmisión estás ejecutando? Una velocidad de cinco o seis sería mejor reemplazada por una de nueve, 10 o 13 velocidades con la potencia de salida renovada del motor, aunque cualquiera de los mismos funcionará.

Este trabajo que desea realizar no es algo que haga en una prensa de banco con un martillo, destornillador, alicates y una llave inglesa, pero requerirá un alcalde de combustible o tendrá una muy buena posibilidad de tener un motor de corta duración. I had read in a previous post in this blog that it was only enough to swear a screw in the back of the pump to increase the passage of fuel and thus raise it 

 

[Victordc98]

I had read in a previous post on this blog that it was only enough to tighten a screw on the back of the pump to increase the fuel flow and thus raise it

[Freightrain]

You can just turn the nut on the rack a couple flats to add fuel, but that will not get you to 315 hp.  You need to add enough air to increase the overall power and not burn the engine up from just a bunch more fuel.

My 237 was a bit low on heat on a long pull.  I adjusted the nut on the rack a few flats and I saw the pyrometer increase slightly(still under 1100 degrees).

[davehummell]

Larry do you think you are losing any thing with the stock air cleaner? 

[Freightrain]

Not likely.  A 237 only runs 15# of boost. I've hot tanked it so i know its clean.  Id like to upgrade to paper filter some time.  Need to find a small ss donaldson and make it fit.

Edited December 11, 2019 by Freightrain

[theakerstwo]

On 12/10/2019 at 8:57 AM, AZB755V8 said:

Learn something new today. When did Mack first start piston cooling, what year? Did this happen with the spin on oil filters? 

1966 and the 237 is same block as the ENDT673 B and C

[fuzzy buzzard]

My old draggin' wagon is 235 according to tag, new turbo generating up to 30 on boost and using the oil bath cleaner. Like Freightrain, I know this cleaner is clean inside.

[Freightrain]

Dang Tom...30#!!   Nice.  I'd like to have that much.  I should have updated mine when I had it rebuilt.   Do you have a part number for yours?  I know we've talked about it before, but don't recall you mentioning those kind of boost numbers.  Might be something I look into?  You know, just because.

[theakerstwo]

Put some fuel on it Larry and your boost will come up some.

[blackdog2]

Open vent window ....spray either in air cleaner that will clean the air cleaner out ?..........and give it booooost...

[AZB755V8]

18 hours ago, Freightrain said:

Dang Tom...30#!!   Nice.  I'd like to have that much.  I should have updated mine when I had it rebuilt.   Do you have a part number for yours?  I know we've talked about it before, but don't recall you mentioning those kind of boost numbers.  Might be something I look into?  You know, just because.

A little Borg Warner AirWerks S300 or S400 would give you way more than 30 psi. for less than $1000 new. Even if you go with the same size intake turbine as you got now. I've been using them for a while with real good results. I can peg the 60 psi Boost Gage easily. Only can't keep it there for to long. Coolant temp and Pyro heat up on a few long pulls out in AZ & California. Just have to ease out of it a little to cool down then lay into it again. No downshifting required.

As mentioned before, there has to be a little matching with turbo, pump and injectors to make it all work.

[james j neiweem]

I thought the Maxidyne setup poured more fuel in at lower rpm. Adjusting the fuel would seem to increase torque but not HP. I may be wrong.

[Rob]

It did but the turbocharger was "mapped" to provide the needed air at lower rpm's of the engine. That is where the imbalance of adjusting the fuel limit screw can burn them up. The engine starves for needed air for both cooling and combustion. They get hot quick when overfueled. 

[davehummell]

How about my newly installed etz 673 260 hp. what do you think the boost will be on this engine? I'm kind of interested to know. 

[j hancock]

45 minutes ago, davehummell said:

How about my newly installed etz 673 260 hp. what do you think the boost will be on this engine? I'm kind of interested to know. 

15-18 psi at full rated speed.

[davehummell]

Thank you for taking the time to let me know.