Honda motor... Acty vs Beat

[unclejemima]

Just curious...
I have a 1991 honda Acty pickup (same engine as Acty street van)
The engine code is E07A, 660cc...the same as the engine in the Beat.

The Acty has a carburetor and 34hp and a 7500rpm redline. When driven in the real world, it typically does not like to rev over 5500rpm.

The Beat has EFI and 64hp and a redline of 8500prm, which it frequently likes to visit.

How can 2 engine with the same code be so different? The Beat must have totally different internals (forged, lighter weight components?).

Does anyone know anything about these differences?
Thanks!
-mark

[Steve_M]

Dont think there is much differant on internals, but the Acty has a carb feeding all 3 cylinders via inlet manifold where the Beat has an individual throttle butterfly per cylinder (the MTREC system) so much better air flow into the engine.

[unclejemima]

Its weird how an engine with 2 times as much horse power and a redline over 1000rpm higher has the same internals. Neat. They must have overbuilt the motor in the first place?:confused:

[Mylee]

They must have overbuilt the motor in the first place?:confused:



Or 'tuned down' the E07 for the Acty

[unclejemima]

Or 'tuned down' the E07 for the Acty

Very good point!