big cam 400 cummins tricks

Every motor can be turned up, especially the 425 mechanical CAT.

 

Not to get off subject but does anyone here recall the orginal Carolina KT Shaker from the late 70s early 80s ........yea........that was the truck .

 

Drove one of Bruces BEASTS. 88 International 444 Big Cam 4 13 Double over 3.73 rears and 24.5 tall rubber. Boss wanted to see what was possible out of a Cummions since this was the fleets show truck and since he knew I would not hot rod her also. Dyno hit 720 HP at the ground and BROKE with 150 lbs of rail pressure left and 20 lbs of boost left to feed the baby. Lets just say westbound on Snowshoe in PA was a 72 MPH climb UPHILL at 80K and the steelhaulers GOT OUT OF MYWAY. This same truck did 115 in SD one night and still had 1K left in 13 before redline. Never pushed her to flat out and never got her hotter than 1K pyro either.

 

wow!very kool too bad you dont have any pix of that truck! i d love to see her

 

i was told someone makes a header for these engines does any one no where i could find one

 

No offense but the guys at pittsburgh power dont have much of a clue as to how to build a hot big cam motor. They dont get enough fuel pressure to the them. in order for a big cam to run hard u need at least 240lbs of fuel pressure. PP struggles to get 220lbs at 2200 rpm. so what u end up with is a motor that only runs good at 19 to 2200 and doesnt have any power and gets hot easy. There is only one guy I know that can build a good pump for these engines, Tom Roberts, but unfortunatly he wont build any anymore. pp opens the throttle shaft in the pump up to much and u loose all the pressure that way. Just dont run good with one of their pumps. Plus his pistons are to low of a compression ratio. He may promise 700hp but your never gonna make it.

 

Jonbass that engine I drove had a MAX of 600PSI at the Rail on that dyno run when we broke a DYNO RATED FOR 700 HP WHEN IT HIT 720 I WAS ONLY AT 450PSI RAIL AND 40 LBS TURBO OUT OF 60 I COULD FEED HER. She also had CERMET Pistons retro fitted Highflow cooling system instead of the crap low flow was equipped with a CAC retrofit we thank Kitty Cat for the Intake on that one. You know a 3406B model intake will mate up with a BIG CAMIV block. If I had really wanted to get extreme I also had water injection to cool off the exhaust if needed. However the Turbo was only at 1000 and would hold til 1200 safe.

Even pulling Snowshoe in PA she never got hotter than 900 normally Pyro temp. However there was one time she did melt down right before the overhaul. My mother had a Heart attack I found out and my boss told me even if I blew it up scream it in. Wrong thing to tell me that day. IL escorted me in from the KY line I was on I-24 at the time and I came in screaming by the time I got her back to the yard 2 pistons had holes in them one was cracked and #5 had swalled a valve. Why because I melted the turbo into a pile of SLAG.

 

Do you have any suggestions for making around 250-300lbs at 2100? this pump is for a working truck, a 350 big cam 4 so its not needing anything really wild but a nice solid increase in power

 

sorry had to find my setup sheet. Remember on a BC4 and all Cummions they are a Pressure Time setup. For What your Wanting find a place with a flowbench have plenty of shims for the Governor Spring and a #6 button for the Governor. Then for the Throttle shaft go with maybe 1/3 opening til you get the pressure you want at the RPM range your wanting. However be careful that setup if not done right will melt pistons.

 

Bruce from Pittsburgh is a bull#######.