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04 /24/ 24, 11:01am

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Subject: 3208 power enhancments Author: Mike Hipster [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 01/ 1/ 03, 9:45pm I've just purchased an 83 FCRB 35. Its got the 225 turbo with 200k showing on the odo, I'm sure I'll be doing a little repower to it soon. I have experience with the "little" V-8, I have 30k miles on a 3208 250 hp turbo custom built to my specs. Balanced and blue printed with roller cam and lifters. Yes, I'm into racing. I have this engine in an L8000 Ford converted to a motorhome/fifth wheel puller with a 10speed R6610 roadranger. The rear gears are 4:10 with 11 22.5 Michelins, runs 75 at 2500 rpm. As we all know, there is never enough power. I have just installed the turbo kit for the 300 hp, the pipes connecting the turbo to the manifolds are larger too. The turbo assy is twice as big as the 250 stuff. I have the charge air cooler from an L10 Cummins. I ran the 250 setup through the charge air cooler and could get 10 pounds of boost and get the pyrometer up to 1000 on a hard pull. (GVW 45000#). The bigger turbo seems to provide more punch (get 13# now) but I have 375 hp marine injectors on order. It wants more fuel now, more air more etc. etc. The injector pump needs a different cam to complete the arrangement but I will wait on that until I get some time on the bigger injectors. I always hear that power needs cooling, I have the big radiator from the L10, I rarely need to use the fans with this radiator so I'm optimistic it will be adequet to achieve the 375 hp level. It should be noted that this radiator/charge air cooler won't fit in a bird chassis. You may be able to get this set up in a sp36 but never in a FC. I will be attempting to maxamize the 250 hp arrangement in my 83 FC, I will be trying a propane injection set up, I will gladly share my experiences with forum members. I can help with engine and Allison questions, don't be shy. [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: 3208 power enhancments Author: Jeff Miller [ Edit | View ] Date Posted: 01/ 2/ 03, 9:52pm Mike: I'm interested in your upgrades to the FC, had fun upping power in my old '77 FC-na with different injectors/timing/pump/gears. I currently have the 250hp in my '84 FC. I'm told that the 250hp has the roller cam/lifters and is essentially the same engine internally (cam, piston oil sprays, etc.) as the 300hp ATAAC engine. I have considered adding an aftercooler beneath the coach, only place it'll fit, but am not sure the current pump and injectors have the capacity for the fuel flow necessary for 300hp (although a friend at Cat tells me that he believes that they are the same?). I'm also looking for more intake airflow, I can only get around 14psi boost, probably because of the less than favorable intake design which I'll be changing. I'll probably be turning the full-load point up to 2800 soon, will see what that buys me in pulling power. I haven't messed with the rack, I am not a big fan of black smoke, will work on air intake first. The 300hp went into the '87-'89 FC but with a different (ZF) tranny, and the aftercooler is in front of the radiator with a different grille to make the room. I have the '87 grille on my coach, it buys me about 2" more in front of the radiator, not enough for the cooler. I'm also told that the MT-643 can't handle the power, is rated at 250hp, can that be changed or will I need a different trans? Your 225hp has a different torque converter also, matched to the power curve of the 225. The synthetic fluid keeps it cool so far. Also use RedLine Diesel WaterWetter to help keep water temp down, but it probably won't keep it down for long if I add 50hp. Keep me up to date on your thoughts and mods, I'm happy to see someone else here breathing some life into these critters, sounds like you're havng a good time at it and know what you're doing. [ Post a Reply to This Message ]