WTF is this for?
01-07-2008, 12:50 PM
#11
Senior Member
Join Date: Jun 2003
Location: Grand Prairie, TX
Posts: 917
Originally Posted by RONIN FC' post='891567' date='Jan 5 2008, 07:55 AM
[attachment=43644:w_IMG_1650.JPG]
I cant think of or see any reason for this in the rotor housing. At least in my application.
Stolen image:
I cant think of or see any reason for this in the rotor housing. At least in my application.
Stolen image:
Notice there's four of them on the rotor housing: My guess is they were used to mount the rotor housing up to some machine or device that did more work during the machining process.
Someone mentioned pinning. Those lands aren't as wide as a dowel land (16mm) but a buddy of mine GMON and I had an idea last year to go for using those holes, or similar ones, for something called 'pocket pinning' where a short, thru pin would be used in those or similarly-machined spots. Think of the steel pins that are on the back of your rear iron housing that index into the bellhousing of the transmission.
B
01-07-2008, 12:51 PM
#12
Senior Member
Join Date: Jun 2003
Location: Grand Prairie, TX
Posts: 917
Originally Posted by 13BT_Starlet' post='891660' date='Jan 6 2008, 05:23 PM
everyone that I've know to do pinning always done it on the spark plug side do to the fact thats were most of the twisting and pressure point is at , do some research .
I thought i was done substantially BTDC near the upper dowel land?
B
01-11-2008, 06:29 PM
#19
Senior Member
Join Date: Jun 2004
Posts: 524
Originally Posted by Latin270' post='891884' date='Jan 9 2008, 01:41 PM
I believe the old 13b motors actually had a tension bolt there.
Not just 13B but all models had an extra tension bolt hole.
If you look at the rear side housing there is probably an undrilled, unfaced boss at that location as well.
Mazda got a lot of life out of their casting forms. Notice that the RX-8 engine has rudimentary exhaust port depressions in the rotor housings.