Need a description of the bus before being able to answer the question. Things such as age, model, make, size, amount of insulation in body (if any at all), & engine size all matter. If you would have more than 10-15 people on board, definitely need fresh air exchange or it gets really stuffy & smelly in short time. Further info. Spent about 7 years in the bus business. First outfit I worked at was basically school operation, but had 3 road coaches & one we called "Old Glory". That was a school body shell that had been refitted. IHC DV550 engine, air suspension, coach seating, extra insulation, add on a/c. The a/c was self contained, had its own engine to spin the compressor & fans. Was semi-comfortable at less than 80 deg outside temp if not parked in sunshine. After about 40k miles it developed so many body rattles that the boss traded it for another road coach. Rest of my bus time was spent in road coaches. Thick body insulation, sealed, tinted, double pane windows. A/c compressor was driven off the Detroit 8v71 or 6v92 engine. Condensor fan was electric, powered by 24 volt, 400 amp alternator. When that a/c kicked in, it would make the engine sag for a few seconds. More than you wanted to know. Willie
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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