Mj -> rf

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Yeah. Also, It does convert to and from Industrial craft's EUs.

EDIT: Ok, never mind. Looked up the wiki to give you the exchange rates on power and found something out.
The wiki said:
The cable's most useful property is being able to transmit EU (1 EU per 4 RF), RF and MJ(1 MJ per 10 RF), and freely convert between them as necessary, allowing for RF-based power generation to fuel EU-based machinery and vice-versa.

Note: this cable cannot accept MJ power as an input.

Apparently, It only accepts EU and RF, but can output any of the three.

Edit #2: Wait. Why are you trying to convert MJ to RF anyway? Using the MFR cables, you won't need MJ power production. So, you could just make RF power.
 
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isnt that what the EnetBridge mod is for? allowing any cable to transfer any power type pretty much?
 
I was using railcraft industrial engines powered by a boiler.
hm... You could always use a Steam Turbine instead. Each Industrial engine takes 40 mb of steam per tick to make 8 MJ(equal to 80 RF). The Steam Turbine take 320 mb of steam per tick to make 200 EU(equal to 800RF). One Steam Turbine (producing the equivalent of 800 RF/tick) uses the same amount of steam as eight Industrial engines (producing the equivalent of 640 RF per tick). All using MFR's pipes to transfer the power. Iirc, a max size high pressure boiler produces 720mb of steam per tick, enough to run two Steam Turbines for 400 EU/tick (or 1600 RF/tick) with steam to spare.

Though, now i'm wondering how many turbines a Big Reactor can fuel.

EDIT: just in case anyone wanted to know about the Big Reactor + Railcraft Steam turbine. It seems that the max steam output for a big reactor is 40 buckets per tick. It can fuel 125 Railcraft Turbines for 25K EU/tick (or 100K RF/tick if converted). This is all assuming that the info I found isn't out of date. Big Reactors Data for 1.7.10 (WIP) @Skyqula 's spreadsheet is quite detailed.
 
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Well, my 9 fuel cell Big Reactor is feeding 2000 mb steam to a Big Reactor turbine for over 27Krf/t, & it could do more, but not enough for a 2nd max sized turbine, I think. You can set up a closed loop for water/steam with the Big Reactors turbine, but feeding that much steam to railcraft stuff means having to constantly supply that much water, & moving that much water fast enough is the biggest challenge in setting up an actively cooled Big Reactor.

But you can make a Big Reactor a lot bigger than the 1 I use.
 
Thermal Expansion adds its own steam dynamos, which produce 80 RF/t, equivalent to Raailcraft's Industrial Steam Engines. So no need to mess with conversion in this case.
 
There is no MJ in 1.7. It's all RF now. You can use BC kinesis pipes to transfer RF. Oh, and there is no perdition or power loss in them anymore. Have fun.

But what version did this changeover occur, as usual FTB packs are using old versions, in this case BC 6.1.7, RC 9.3.3.0