Marck Posted January 19, 2007 Share Posted January 19, 2007 The thread on the crank sprockets (http://www.ultimatesubaru.org/forum/showthread.php?t=69210) has sparked a question in me. Why did Subaru feel that it was necessary to have a harmonic balancer pulley on the Turbo EA82? The NA EA82 just has a regular pulley to drive the accessories. Link to comment Share on other sites More sharing options...
joostvdw Posted January 19, 2007 Share Posted January 19, 2007 The thread on the crank sprockets (http://www.ultimatesubaru.org/forum/showthread.php?t=69210) has sparked a question in me. Why did Subaru feel that it was necessary to have a harmonic balancer pulley on the Turbo EA82? The NA EA82 just has a regular pulley to drive the accessories. I believe the harmonic balancer, is actually a dampener, to dampen the shocks from the engaging AC compressor to the crankshaft. the reason why NA ea82 don't have them, I don't know, perhaps you looked at a non AC? Link to comment Share on other sites More sharing options...
naru Posted January 19, 2007 Share Posted January 19, 2007 The thread on the crank sprockets (http://www.ultimatesubaru.org/forum/showthread.php?t=69210) has sparked a question in me. Why did Subaru feel that it was necessary to have a harmonic balancer pulley on the Turbo EA82? The NA EA82 just has a regular pulley to drive the accessories. Probably because the higher power engine has more intense harmonic vibrations. Link to comment Share on other sites More sharing options...
Marck Posted January 20, 2007 Author Share Posted January 20, 2007 All Turbo models had the balancer, A/C or not. Are there any ill effects if you swaped the balancer/dampener pulley for a regular pulley on a turbo EA82 engine? (Obviously reasons for doing this is to reduce rotating mass like that of lightening the flywheel.) I figure there may be long term effects. The main bearings may wear faster. How many out there have swapped pulleys without problems and how many miles have you put on it? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 20, 2007 Share Posted January 20, 2007 Not worth the trouble - you wouldn't gain even .5 HP from it. Lighten the flywheel if you want to do something productive. GD Link to comment Share on other sites More sharing options...
Marck Posted January 20, 2007 Author Share Posted January 20, 2007 Not worth the trouble - you wouldn't gain even .5 HP from it. Lighten the flywheel if you want to do something productive. GD Been there, done that. I have a XT6 flywheel with 6 pounds removed. But is that all it will gain? The harmonic balancer pulley is pretty heavy. I would think putting on a SPFI pulley would give it maybe 5hp. Or it should at least make it rev faster. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 20, 2007 Share Posted January 20, 2007 I don't think there's much difference in weight frankly with the SPFI pulley. It's actually pretty heavy. Each pound on the crank is like 2.7 HP.... but unless you go with aluminium, I doubt you would gain much. Then there's the alignment issue.... doesn't the turbo use a different hub depth for the water pump? I don't think the SPFI pulley would line up. GD Link to comment Share on other sites More sharing options...
mikeshoup Posted January 20, 2007 Share Posted January 20, 2007 The non turbo pulley is probably about a pound or two lighter. Putting one in each hand, there is a significant difference in weight. As for hub height differences, that only deals with what kind of A/C setup the car has. Link to comment Share on other sites More sharing options...
daeron Posted January 20, 2007 Share Posted January 20, 2007 post deleted, on account of me being.. pointless.. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 20, 2007 Share Posted January 20, 2007 As for hub height differences, that only deals with what kind of A/C setup the car has. Right - but all the later turbo's I've seen had AC, and they use the square AC compressor..... I still think belt alignment might be an issue. GD Link to comment Share on other sites More sharing options...
ccrinc Posted January 21, 2007 Share Posted January 21, 2007 Yes, it's a belt alignment issue. Emily http://www.ccrengines.com Link to comment Share on other sites More sharing options...
kingbobdole Posted January 21, 2007 Share Posted January 21, 2007 I ran one on my Rx... There was a slight increase... but hey for the $0 I paid for the pulley, it was worth it... The car seemed to rev a bit quicker, and actually I have an aftermarket pulley on my XT-6 which was actually 6 lbs lighter then stock and I noticed the same reaction. As far as the belt alignment... It is off, but this is also a V belt... its not that big of a deal, its only like 1/8" off... Link to comment Share on other sites More sharing options...
Ross Posted January 21, 2007 Share Posted January 21, 2007 1- lightening flywheels and the like do not give you any more hp, as long as the center of mass of the item is on the crankshafts axis of rotation. The only effect it has is to lower the reisitance to acceleration. 2- Since rotational inertia varys with the square of the radius, a small item like a crank pulley will have very little effect on the total rotational inertia. The flywheel has so much more rot inertia than the crank pulley to make the pulley negligible. Don't waste your time. Link to comment Share on other sites More sharing options...
Carmen Posted January 29, 2007 Share Posted January 29, 2007 i dont understand.. have you pics? Link to comment Share on other sites More sharing options...
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