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Old 02-10-2010, 11:11 AM
jackieB
 
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Fuel injection for a 454 27' motorhome?

I am getting my 454 chevy engine rebuilt today. It is coming out of a 1984 Tiffin Allegro Motorhome. I have heard about fuel injection being an option but don't know about the benefits or drawbacks. Anyone can advise? Also I need a cruise control to install.

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Old 02-10-2010, 12:41 PM
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More info , is it tbi?
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Old 02-10-2010, 02:02 PM
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If it's TBI don't bother. My last SS454 P'up I sold got 9-10 MPG, didn't matter how I drove it cruising or blasting it. Had a few Mods, Chip, Headers, Cam, HiFlow Cats.
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Old 02-10-2010, 03:34 PM
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Quote:
Originally Posted by jack0034
I am getting my 454 chevy engine rebuilt today. It is coming out of a 1984 Tiffin Allegro Motorhome. I have heard about fuel injection being an option but don't know about the benefits or drawbacks. Anyone can advise? Also I need a cruise control to install.
GM didn't start to offer fuel injection on the 454 until the 1987 model year, so if it had EFI, it wasn't a GM system. The Throttle Body Injection used on the 87-95 trucks can be adapted to your vehicle pretty easily, but a custom PROM will likely be required. Advantages are easier starting, more consistent operation during cold and warm engine operating, and no possibility of vapor lock. As noted above, just don't expect any magical increases in performance or mileage. It is nice that the TBI has a fraction of the parts in a Qjet, however.
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Old 02-10-2010, 05:50 PM
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Give me the TBI verses the carburetor any day. Its not the best fuel injection out there but it does give some pretty good low end torque which is likely what you are after in a 454 especially if its in a motorhome.

You wont have to worry about sticky or misadjusted/non working chokes, dirty/stuck/worn out needle and seats, jets, metering rods, idle mixtures etc. No adjustments or tuning to compensate for temperature, altitude, etc etc.

And although you might not get additional fuel mileage due to the engine being more efficent, you might gain mileage in the winter due to the fact that you wont have to start the engine and let it run for 10 minutes before driving it. Plus the quicker/easier starts (which cause less wear and tear on the starter, battery, etc) and you get better throttle response too.

There is a reason why every car made today is fuel injected. Heck anymore, even lawnmowers are starting to go fuel injection (Kohler makes fuel injected engines for zero turn mower) as well as inboard AND outboard boat motors.
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