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Harmonic Balancer Rb20det & Rb25det

zertek

By zertek,
in Engines & Forced Induction

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zertek Proficient

zertek

Posted
Posted

Hey guys, in the middle of a conversion, RB25det upgrade from my RB20det. The RB25det harmonic balancer has 2 decent cracks around the front rim, which im sure will tear what ever belt i put on in half. So looking at my RB20det balancer (with no cracks)... they are slightly different but the over all 7 timing marks are visually the same.... just checking if these are ok to swap?

post-32703-1185428730_thumb.jpg

RB20det balancer

post-32703-1185428938_thumb.jpg

RB25det balancer

post-32703-1185428780_thumb.jpg

timing marks (visually identicle on both)

thanks!

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https://www.sau.com.au/forums/topic/178167-harmonic-balancer-rb20det-rb25det/
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AD4M Proficient

AD4M

Posted
Posted

only diference is the number of ribs for the power steering belt

rb20 and rb26 from r32's run a larger belt for the power steering and hicas pump (pumps from front and back)

rb25 and rb26 from 33/34 run one less rib on the belt becuase the hicas is elcetric so less stress/load on the power steering pump

so no you cant run an rb25 ballance unless you run an rb25 power steering pump and remove the hicas (this is what i have done)

zertek Proficient

zertek

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Posted (edited)

ok... well i know that the timing belts are the same for the rb20det and the rb25det and the timing marks are the same on the balancers.... im guessing its ok to just do a direct balancer swap (use rb20det harmonic balancer on rb25det).

I will be using the R32 power steering pump and air compressor still because i have left them attatched to the engine bay and ready to be bolted to the rb25det when its dropped in... meaning i wouldnt have to change any belts either (Rb20det power steering pump and rb20det balancer).

Tomorrow i will measure the balancer sizes and post up results, just for reference if anyone else needs to do the same.

Cheers

Edited by zertek

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