Thoughts on putting a 8v na engine in a 87 944s

[Ipilot]

Hey guys a recently bought a 87 944s with a blown motor, chain slipped and now she has no compression. I have been considering dropping a na 8v motor in her instead of rebuilding the S engine. I think this will be easier and cheaper. Has anyone done this before? What parts do you think I would have to change out to make this work ? Let me know what you guys think. Thanks

[Jfrahm]

It'd be kind of a pain with the DME and harness being different. An S2 motor should pretty much drop in and would probably run good on the S DME, it'd be maybe $2500 for the S2 motor but it'd be an upgrade rather than a downgrade and a lot less work.

The 16v has a different flywheel (tooth count for crank signal) and has 2 knock sensors, different AFM, an ignition module, etc. Wiring the 8v would be a lot of work even with the 8v engine and DME harnesses.

The S2 motor might be at a decent tune with the S DME or might dial in with a fuel pressure tweak or some slightly larger injectors for a small correction to open-loop WOT fueling (which I think would be adapted by the DME from the closed loop anyway).

I would not take it racing without some testing with a wideband or swapping to an S2 DME but it'd be worth a try. S and S2 injectors are the same but going to some 30's would compensate for the larger displacement. If you used the S2 intake you'd have to bodge the air filter and AFM setup but that'd be no big deal.

-Joel.

[ckelly78z]

As mentioned by Jfrahm, the DME might be an issue along with some other wirng harness unseen struggles. I wouldn't do it for the drop in performance thaat you would see.