Bill,

I used the flat surface on the front cover just below the OMP as a
place for my dipstick.  No reason why you couldn't drill & tap for a
turbo drain.  Of course, you'd have to remove the front cover (not
such a big deal, really).

Mark S.


On 6/26/12, Tracy <rwstracy@gmail.com> wrote:
> Option 1.   -    No, for the reasons you said.
> 2.  -   OK, but more trouble than it's worth.
> 3.   -    Would work.
> 4.   -    Works fine .
>
> Best is to drill & tap foot of rear rotor housing on spark plug side.
>
> Tracy
>
> Sent from my iPad
>
> On Jun 26, 2012, at 1:59 PM, William Mason <instructorbill@msn.com> wrote:
>
>> Reading on an rx7 forum I've learned that there are multiple options for
>> the turbo oil drain on an NA engine.
>>
>>
>> I can   weld a bung into the oil pan
>> I can change the front cover to the Turbo 2 one
>> I can drill and tap the NA cover to accept a -10AN fitting
>> I can make a oil metering pump block-off plate that will accept a -10AN
>> fitting
>>
>>
>> My concerns are that  that option one would put the drain oil below the
>> oil level and add restriction.  Option 2 would upset an already rebuilt
>> engine...  don't mess with perfection.  Option 3 of  the available areas
>> to drill and below the OMP pad and further down on the cover... the
>> slanted section, which one would be better?
>>
>>
>> Option 4 seems best but it seems a little high and it too may cause some
>> restriction.
>>
>>
>> Has anybody used the OMP block-off-plate drain idea with any success?
>> Should I just put my big-boy pants on and take the front cover off and
>> either switch the front cover or drill/tap or tig a bung to the lower
>> section of the front cover well below the OMP pad?
>>
>>
>> Advice sought.
>>
>>
>> Regards,
>> Bill Mason
>