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- Apr 26, 2011
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... Up late perusing through ePER and spotted a couple of things that jump out at me when comparing the 85hp TA engine in the 500 to the 500L's 103hp unit (Yes, 103hp - it's marked as a 77Kw engine):
What's the same on initial looking:
So fundamentally, the engine is strong enough - I note that the pistons have the underneath of their crowns cooled by oil jets on both engines.
Interested to see why a different head, implies the porting has been changed (so thus, the 85hp is restricted?). Means a head port is plausible to release some extra horsies, amongst other things like a remap.
The turbo appears to have the recirc dump valve electrically driven, rather than by vacuum as on the 85hp engine. Saves pipework, the wastegate appears to be controlled by a conventional vac actuator - no doubt modulated like the 85hp engine. I wonder if the turbo has different 'tuning' (A/R) partly because the car the engine is in a bigger, heavier car.
Lots to look at more closely; I shall keep hunting through documentation and update when I can..
- There's a different turbo
- A different head casting
- A different camshaft (don't forget the exhaust valves are 'conventionally' actuated, so more than likely differing exhaust lift/duration)
- A different ECU (obviously)
What's the same on initial looking:
- Pistons
- Rods
- Bearings
- Crank
- Flywheel (DMF as the 500L is a bigger/heavier car)
So fundamentally, the engine is strong enough - I note that the pistons have the underneath of their crowns cooled by oil jets on both engines.
Interested to see why a different head, implies the porting has been changed (so thus, the 85hp is restricted?). Means a head port is plausible to release some extra horsies, amongst other things like a remap.
The turbo appears to have the recirc dump valve electrically driven, rather than by vacuum as on the 85hp engine. Saves pipework, the wastegate appears to be controlled by a conventional vac actuator - no doubt modulated like the 85hp engine. I wonder if the turbo has different 'tuning' (A/R) partly because the car the engine is in a bigger, heavier car.
Lots to look at more closely; I shall keep hunting through documentation and update when I can..