425 hp 3208 cat

[cimath]

I have a cat 425 TA year 1991 with low hrs. (4000) I would like to convert the 425 to 210 NA to reduce fuel consumption , can this be done by taking parts off the 425 to make it a 210 NA. Don't need the speed. Will change the clutch from 1.77:1 to 2.5:1

 

[MapisM]

That's quite some question, for a first post! Welcome to the forum, anyway.
But the short reply is definitely no, I'm afraid.
Besides, I don't understand why you're expecting lower consumption by doing that.
When comparing the TA and the NA at the same HP output, the consumption (lb/bhp-hr) would be very similar, if not slightly better with the TA.

 

[volvopaul]

You will have to buy a lot of parts, ie pump, injectors, inlet manifold, exhaust elbows riser etc, not really worth it, 4000 hours is a lot for the 425 as it was really stressed at thet hp as the 435 has a larger heat exchanger turbo and intercooler,would not bother if I was you, just keep the revs and speed down.
Also the pistons maybe a lower compression ratio for the turbo spec it will white smoke with the wrong pistons, I have had a lot to do with these engines over the years, not the best by far IMHO .

 

[compie1]

Try boatdiesel there some US eng of CAT and other manu that can help out on this, only thing its a yearly subscription of $ 25 for but really worth it !
But 4000 hrs is not so much some US users got a lot more (trawlers)

 

[Divemaster1]

[ QUOTE ]
I would like to convert the 425 to 210 NA to reduce fuel consumption ..... Don't need the speed....

[/ QUOTE ]
Apart from repeating what other have said ... not an easy task ...
My question would be more along the lines of "why?"...

If you do not need the speed, throttle back ... Those engines will last darn near forever if you limit yourself to 1500 RPM... Fuel consumption is a direct result of load, so if you take out 100HP the fuel consumption will be the same on that specific engine weather it is rated at 210 or 425 .... Stay as is and run lower rpm, and you still have the power if you should need it. Main thing here is that you get a good operating temperature on the engine (s) and clean combustion..... turbo will kick in about 1300RPM, so you'll run that with good lubrication and oil pressure... have a cooling system which is dimensioned for the heavy load under poor conditions, or having to outrun the weather etc.... all at no additional cost...