Here are the prices of the parts you will need.  None of the existing
2.17 parts are usable.

Prop Shaft  -                      $670.00
prop shaft front bearing           35.00
prop shaft bearing keeper       18.00
Planet carrier & gears           120.00
sun gear                               50.00
sun gear shaft                       55.00
ring gear & bulkhead              70.00
planet carrier thrust bearing    20.00
input shaft thrust bearing        45.00
input shaft pilot bearing          12.00
shipping cost                         TBD

I can not furnish directions for performing this conversion.

Tracy Crook,    RWS


    Tracey con I buy the needed parts as I have access to machine shop
    If I don't change I will have to change motor mount and prop
    Thanks Keith


        Keith,
          It is not easy to make this conversion since it is not just a
        matter of changing parts.  I did one and it was simply too labor
        intensive to be practical.  I flew the 2.17 drive for many years
        on my RV and it worked nicely so it is not absolutely necessary
        to make this change.

        All the best,
        Tracy Crook,    RWS


        Laura or Tracey    I have a 2.17 redrive can I get the parts to
        convert to 2.8  I am building RV7 with 13B Mazda  Need help
        Thanks Keith Menard

Paul Lamar
Sorry for the long time for me to get back as work keeps me away  Here
is list of parts Tracey said I will need do you think I can safely lock
ring gear or am I wasting my time and money and just buy new 2.85
redrive  or has anyone done such conversion?

Next question does your plans for engine mount give tube length to help
setting up to cut as all I have read I should scrap my engine mount
because of heat on engine mount ?

Thanks Keith


I think it is doable. It may take a sleeve pressed and welded
in the main casting to lock the ring gear. I don't recall anybody doing
it so far however. You might have trouble selling the 2.i7 due to the
economy right at the moment. It is more important to have a 2.85 if
you also have a p-port engine. If not your engine RPM will be limited
anyway due to prop diameter.

What kind of engine mount do you have now?

Yes our dwgs  give the tube lenght. It is best if you have something
like 2D Q Cad so we can send you a dxf and you can then use Qcad to get
any dimension. Try that approach first. If that does not work we can
do something else.

Here is the Schertz beam version  MM for the RV7 which is your kit of chioce
as I recall. I will revise it for Jeff's motor plate if you wish.

Paul Lamar