Any suggestions why my bus loses power/speed

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Any suggestions why my bus loses power/speed

Home > Discussion Forum > Bus Conversions - School

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All Messages in Thread	Author	Date
Any suggestions why my bus loses power/speed	Georgia Southern	12-27-02
I recently purchased a 1982 school bus. It has a 454 with a 4 barrel holly carb. It had been sitting for four years. I changed the oil, belts, and fuel. I can hold a speed of about 60 max on a level suface but when I start going up a hill my speed quickly goes way down like to 25 mph. Anybody know what I need to do???? Thanks
Re: any suggestions why my bus loses power/speed	ron	9-18-05
They don't put 454's in school buses they had 366 and 427 tall deck big blocks i would say it has the 366
Re: any suggestions why my bus loses power/speed	any name will do	12-30-02
You need to downshift your transmission to get your engine in the right rpm range so your engine can work efficiently. Just like on a bicycle if your in top gear and come to a hill you will break your legs off trying to pump up the hill.
Re: any suggestions why my bus loses power/speed	Tullamore	12-28-02
My bus also has loss of power, although not that bad. It has a 345 with a 2 barrel holly. It has a vacuum gauge and the more I accelerate the lower the vacuum gets till it reaches zero and the bus stops accelerating. I believe this is due to the type of governor on the Holly. I suspect that if I put a non-governed carb on it wouldn't have the power/acceleration problems.
Re: any suggestions why my bus loses power/speed	Mark O.	12-28-02
It sounds to me as if you are having a fuel supply problem. If you have a governor, determine if it is shutting things down prematurely. Check your fuel filter(s), fuel lines, and fuel pump to make sure fuel is flowing. If you are running below 5" of manifold vacuum, the reason why you are losing power is the engine doesn't have enough H.P for what you are wanting to do. It takes a lot of H.P. to push a brick shaped object through the air. Add in tons of steel and it is a wonder you are able to go as fast as you do. There is a reason why new motorcoaches have 400+ H.P. engines. Good luck and happy trails. Mark O.
Re: any suggestions why my bus loses power/speed	Georgia Southern	2-20-03
Thanks again, The linkage needed to be adjusted and the carb cleaned. Everything seems to work fine now thanks for the help
Re: any suggestions why my bus loses power/speed	Dennis	9-16-03
Ive got the same problem. ive changed the carb,distributer,fuel,and pump coil ive had mechanics look at it and check everthing ive got one more guy looking at it this week.noone seems to know so far. ill let you know if we find anything. iuf you have any questions email me. dcoym@aol.com
Re: any suggestions why my bus loses power/speed	dennis	9-17-03
Well problem solved, go back to the basics. check your plugs, had a man that was a bus mechanic for 40 years check mine out he told me to go get champion spark plugs for some reason the old busses like them. well i did and problem solved. more power all the holes are firing properly now.