B8 exhaust ports...

[jcallaway86]

Someone has got to know this... I'm trying to see if the B8 16 valve SOHC has the same exhaust ports as the BP DOHC... Found some information that suggest this is true, and from looking at varius websites pictures of exhaust mani gaskets, it seems they are the same.

Straight from wiki:

B8

The 1.8 L (1839 cc) B8 is not just a bored and stroked B6. Rather, a new block with widened cylinder spacing. The bore is 83 mm and the stroke is 85 mm. This SOHC engine was used in various Australian Mazda 323s and the American 1990-1994 Mazda Protege. It came in both 8 (B8-E) and 16-valve variants (B8-ME).

The B8ME is also found in Canadian variants of the 323 hatchback.

BP

The 1.8 L (1839 cc) BP is a dual-overhead variant of the B8. It was first found in the 1989 Mazda Familia and American-market 1990 Mazda Protege LX. This engine was dubbed BP-ZE and featured a forged crankshaft, piston oil squirters, an aluminum baffled oil pan, and Variable Inertia Charging System (VICS). This particular variant can be found in the following vehicles:

[Mi|<E]

The B8 and BP do NOT share the same exhaust ports and thus can NOT interchange.

Only the cars per engine listed below will interchange headers.

B8-ME
1.8 SOHC 16-valve
1990 Mazda Protege SE
1990-1991 Mazda Protege 4WD
1991-1994 Mazda Protege DX [2359 lbs.]
103hp @ 5500rpm
111ft-lb @ 4000rpm
28/36mpg (manual)
24/31mpg (auto)

BP-ZE
1.8 DOHC 16-valve
1990-1994 Mazda Protege LX [2480 lbs.]
1991-1993 Ford Escort LX-E
1991-1996 Ford Escort GT
1991-1996 Mercury Tracer LTS
125hp @ 6500rpm (127hp @ 6500rpm on Ford & Mercury models)
114ft-lb @ 4500rpm

[jcallaway86]

Thanks for the help. Another question I have is are the blocks the same? I know the BP has forged crank etc., but are the heads interchangable?

[Shades]

How is the exhaust ports the same when it's two totally different heads... that wiki thing tells you nothing about that.

Yes the blocks are the same... B8 and BP... only difference is the pistons and crankshafts.