Anyone know the KPI angle for the GT and Manta spindles

[davegt27]

Kind of a crazy question but I figure it can’t hurt to ask

Anyone know the KPI (king pin inclination) angle for the GT and Manta spindles

Thanks
Davegt27

[wrench459]

6 degrees GT, 8.5 Manta pg. 3C-26 in the 73 service manual

[RallyBob]

Originally Posted by davegt27 Kind of a crazy question but I figure it can’t hurt to ask Anyone know the KPI (king pin inclination) angle for the GT and Manta spindles Thanks Davegt27

In addition, the overall height (from taper to taper) is 6-1/16" for a Manta spindle, and 6-9/16" for a GT spindle. I was *just* measuring this today for Roger Wilson ironically.

[davegt27]

Thanks wrench459 and Bob

It made me look again for my Opel book which I just found
I wonder what they mean by theoretical KPI

I bought some cheap digital level yesterday at Lowes thinking I might be able to use it

Davegt27

[wrench459]

Dave
This might be a good time to pay the 50 or so hard earned bucks on placing the Opel on a modern alignment machine.
KPI is an old term and I was surprised that the service manual held the convenction. The more appropriate term is SAI.
Another place to look at is the set back to see if the rearend is centered to the thrust angle.

Originally Posted by davegt27 I bought some cheap digital level yesterday at Lowes thinking I might be able to use it Davegt27

[davegt27]

Thanks wrench459

I am not trying to align the car (the front end has been removed)

I am trying to transfer the critical dimensions into Solidworks (a design program)

So I would guess the theoretical KPI is KPI plus the Camber angle (since they are taking the measurement on the car)

So that would make the actual steering knuckles KPI 7 deg? (Since the nominal camber is positive 1 deg to give the KPI on the car of 6 deg

Does that sound right?

thanks in advance
Davegt27