gear drive cover difference

[noiraude]

hi all!
could someone tell me if switching from a KB/DONOVAN gear drive to an RCD with the built in front bearing support moves the crank pulley mounting surface away a lot from the engine block?
thanks for any infos
cyril

 

[greenracing]

I ran one of the bearing support covers many years ago, so going on memory, so those with current experience can correct me if I'm wrong... You turn the blower pulley around so that it goes over the bearing support, then the pulley lines up in the same place as a standard hub.

 

[Z06]

The RCD front bearing gear drive cover moves the pulley out 1.5" verses the RCD short hub and 1.22" verses the RCD long hub. It is designed to use the center flange pulley. I just finished adapting one onto a KB Olds gear drive cover and milled a "used" Hemi Titanium bearing support hub out to the BBC size and recut the keyways. Keeps the front of the engine clear of all the clutter.

 

[noiraude]

so you managed to adapt something like this:
http://www.rbssuperchargers.com/Pro...using_Brg._Assm._Tall_Cam_Gr._Dr_--2400-0061A
to a KB gear drive cover,then a hemi hub?

 

[Z06]

Yes, found the Titanium hub on ITA.com (thanks Will!) for a great price and got the bearing housing from RBS. Milled front cover and a 5" dia billet alum round to light press fit and welded/final machine. Hub had to be machined on lathe to BBC size then honed and rework keyways. Grade 9 Automan bolt and machined down washer to fit and it's bullet proof.

 

[greenracing]

oops - Z06 is right, the RCD takes the center flange pulley. I was thinking of the KB cover:
http://www.rbssuperchargers.com/Products/Used_KB_Std._Cam_Bearing_Support_Gear_Drive--7011-0010B
which takes the flat back pulley turned around.

 

[noiraude]

great work!