2.7 swap for 2.5? (Blown motor)

[911monty]

Originally Posted by 78F350

I'm in the middle of putting a '97 2.5 into a 2001 base, sort of the opposite swap. In my case, I swapped over all of the 2.7L intake, fuel, harness, and vacuum stuff to the 2.5. The only real creativity involved was making a template and re-drilling some of the mounting holes in the intake a few mm over from where they were.


There's a big difference in the 2.7L intake and the 2.5L intake. By my HF calipers the intake port on the 2.7L engine is 54mm vs 43mm on the 2.5L. Between that and the resonance tube, I'd want to keep the 2.7L intact and look at swapping the DME and adding some wiring and pedal for e-gas.

I will be following this swap with great interest!! I would imagine there would be a dramatic loss in low end torque going to that large an intake on a 2.5. Intake velocity should take a major loss. It will be interesting to hear your impression. Of course if it works out then Porsche really did put the hurt to these engines!