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Old 04-03-2008, 08:30 AM   #11
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well i loosened the power steering belt a lot, no noise from the belt but its very loose. If i had a scangauge i could run a test but i don't have anyway of testing it. The engine did feel a bit lighter but it could just be me. didn't some people remove their alternator belts and it increase their fe quite a bit. I just want to loosen the belt enough where they don't make any noise but are loose. i'm not to worried about the belt they only cost $8 for my car, for the power steering pump.
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Old 04-03-2008, 08:35 AM   #12
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Quote:
Originally Posted by Ryland View Post
Older civics had different belt tension specs for the fuel efficient model...
i guess every bit helps
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Old 04-03-2008, 12:23 PM   #13
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not good idea

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Originally Posted by VetteOwner View Post
the whole idea of an underdrive pulleys is its generally made out of aluminum, and usually a few inches smaller in diameter than the stock pulley. lighter mass, smaller diameter (works like gears, small gear driving large gear, lots of torue and dont need much power to turn the small gear. reverse the roles, it takes alot of force to turn the big gear thats drivign the small gear.) it frees up some wasted torque, thus more can go to the wheels so you have more available torque at a given speed/pedal travel/ rpm so you can do the same job as before but with less gas.
I've read one day on civics forum that aluminium underdrive pulleys cause a lot of problems like overheating, undercharge of battery, decreased power steering and A/C efficiency and failure of the crank bearings (removed harmonic dampener)
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Old 04-03-2008, 01:49 PM   #14
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An underdrive pulley is going to be better.

A loose belt is going to slip, but it is going to still produce heat through friction (power loss) and possible pulley damage with that friction (power loss).

A drive pulley shouldn't be a harmonic damper, but maybe some manufacturers are doing it.
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Old 04-03-2008, 03:00 PM   #15
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I'm looking at getting a 50% underdrive pulley for my Escort - if it ever becomes available again. Supposedly for about $120 including shipping, it is worth a 15% fuel savings. By my math, that means it would pay for itself in about 10,000 miles at the current local price of $3.50/gallon.
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Old 04-03-2008, 03:33 PM   #16
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http://cgi.ebay.com/ebaymotors/01-05...spagenameZWDVW

would this work for my car
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Old 04-03-2008, 04:13 PM   #17
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Smaller pulleys don't grip v-belts as well, so the belt is going to have to be tighter, if you moved to larger pulleys on both ends of the belt you would gain efficiently, you will also gain if you go with lighter pulleys.
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Old 04-03-2008, 09:10 PM   #18
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holypaulie -

Quote:
Originally Posted by holypaulie View Post
I've read one day on civics forum that aluminium underdrive pulleys cause a lot of problems like overheating, undercharge of battery, decreased power steering and A/C efficiency and failure of the crank bearings (removed harmonic dampener)
Were the Civic forums driving for performance or FE? The whole "take it easy" approach of Hypermiling makes me think that these problems would be less of an issue for us.

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Old 04-05-2008, 09:20 PM   #19
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Loose belts will cause things like slipping in the water pump and more heat. Tighten belts to specified tension. Larger pulleys on accessories will slow things down - may need a little longer belt but will reduce engine load. Thermostat will open a little more for this and compensate. But a non-spinning water pump spells death on an engine. Better off with larger pulleys on accessories than smaller pulley on crank.

Get aluminum racing pulleys and you'll be better off.
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Old 04-06-2008, 12:13 AM   #20
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yes they can cause overheating because your water pump isnt pumping as fast. power steering may be less but still alot better than none(get some arm muscle :P ) and to not have underchargign probelms get a smaller alternator pulley so you kind of keep the same ratio between the crank and alternator.

just because it doesnt make noise doesnt mean its not sliping... when it starts making noise then theres a probelm and somehting needs replacing...

loos ebelts can fall off pulleys too, get caught on stuff once they do fly off and potentially do other damage...
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