Thanks for your informative column. I have two questions:
1. I have a Peugeot 405 station wagon on which I did an overhaul recently, even though I had been servicing it regularly with the best available oil and other consumables. All the bearings, crankshaft, and rings were “standard” (had not worn to the point of needing over-sized replacements).
However, the fuel economy has not improved. It is hovering around 10km/l on long journeys, and 7-8km/l in town. Is there something I am not doing right, as I would expect better from a 1600cc, naturally aspirated car? It has its original twin-carburettor, but its power is not as good as older, heavier cars like the 504.
I also have a VW Golf Wagon GT, 1800cc, twin-charged and I get similar mileage. Is there something I need to look at again or should I accept this as a fact and “move on”?
2. I would like to get in touch with the mechanic (Innovative Mechanic, Car Clinic, May 29, 2013), who had said tuned his carburettor to give 13km/l. You can share my email address and phone number with him so I can find him some business.
George M. Ochenge
1. Methinks you may be expecting too much from an engine with two carburettors, but before we leave it at that, I was wondering: Has the consumption gone up recently or was it always like that? If it was always at 7/10 city/highway then do not expect a miracle where none has been performed.
If the economy has gotten worse, there might be a change in circumstances that you have not noticed: Maybe you carry a bigger load. Maybe you drive faster than before… maybe you use the air-con more… all these because you say the car is mechanically sound.
The power might not be as good as the 504 because the 504 you tried had a bigger engine or a carburettor with a bigger jet. You have not mentioned the consumption of that 504… you will be shocked.
2. I would advise — possibly to the chagrin of said inventor — that you first wait for results from his project. I think it very unlikely that the technology has undergone extensive testing, so there is no telling the effects of long-term use. Nor of short-term use either because the result of strangling carburettor jets is that the car runs lean, which comes with a host of other problems, including stalling, power loss, and overheating.
Give it time before you try it unless you are ready and willing to be a guinea pig for the experiment.