Hi Guys, I’m new to the forum and wondered if you could help me out with the above query? I gather that the “detuned” 1.6 became available when the 1.8 was introduced in the UK. As I am a prospective purchaser and may come across a decent Mk1 with the 90bhp engine, what is involved in getting the engine back up to 115bhp or is this a non-starter so to speak? Many thanks in advance.
Non-starter, different engine.
You surprise me, I thought the Mk1, 2 & 2.5 used a broadly similar engine, with maybe different cams and ECU’s, and heads in some cases.
you can use the earlier cams and head and gain some power, but not it all
I thought it was milder cams and lower compression pistons with other minor items.
The cams are £10 exhaust and £40 inlet plus vat and delivery from Autolink. You have to loosen the cambelt tensioner as you will have to re set the timing when you replace the cams, does that mean that you have to replace the cambelt to be safe. Also you would want to replace the cam cover gasket with the Mazda one.
Assuming you are handy with engines, cost will be between £100 to £200 for parts depending if the belt tensioners and water pump is also changed.
As the pistons being changed is a bit over the top, as Richard has said you will not get the full 27 bhp back.
Thanks Guys, sounds like this is the sort of job I would have done 30 odd years ago when I had my Elan…but not anymore I’m afraid.
Well, they have different engine codes, so Mazda think they’re different.
1989–1993 1.6i NA 1.6 L inline-4 B6ZE(RS) 114 bhp (85 kW) @6,500
1994–1998 1.6i NA 1.6 L inline-4 BP-4W 88 bhp (66 kW)
Just because there are differences, it does not mean that you cannot swap parts arround to address those differences and end up with a better engine.
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Well, they have different engine codes, so Mazda think they’re different.
1989–1993 1.6i NA 1.6 L inline-4 B6ZE(RS) 114 bhp (85 kW) @6,500
1994–1998 1.6i NA 1.6 L inline-4 BP-4W 88 bhp (66 kW)
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Could I just ask if these engines were available at the same time or did the 88 take over from the 114? Also, if I wanted to identify which engine a car had fitted, would those type numbers be stamped anywhere?
From the FAQ
Taken from the Mazda Workshop manual (12/94)
Engine
The purpose of the modification is to increase the low speed torque by changing the valve timing and compression ratio.The following parts have been modified The configuration of the camshafts have been modified:-
Valve timing
Intake Valve Opens 5* BTDC
Intake Valve Closes 40* ABDC
Exhaust Valve Opens 55* BBDC
Exhaust Valve Closes 5* ATDC
The configuration of the pistons have been modified
Compression Ratio - 9.0:1
Fuel & Emission Control System
According to the readoptaion of the B6 engine model, the following changes have been made.
- Injection method has been changed from the two-group injection to the sequential injection.
- IAC load correction has been added according to the addition of the rear window defroster signal input to the ECM.
- IGF signal input to the ECM has been discontinued.
- Signal names have been changed as follows. NE = SGT & G = SGC
- Diagnostic trouble codes No. 01 have been discontinued.
- Vehicle speed sensor input have been added.
- In the exhaust system, the front pipe and the parts after it are the same as that of the BP engine model.
- The heated oxygen sensor has been adopted and its instulation position has been changed.
- The fuel tank capacity has been enlarged and the cruising range has been increased accordingly.
Just replacing the cams will get you to 110bhp so worth doing.
Around about 1994 or so the Japanese home market and the US market got the 1.8 and the 1.6 was discontinued in it’s 115bhp state.
The European not just the UK got the reduced power engine in the MK1.
In 1998 the Mk2 was launched and the 1.6 version was back up to around the higher figure and continued on until early 2005.
Hi,
I too am longing for more power as I am cursed with the 90hp version and was looking to change the engine to a pre 94 1.6 higher hp type but posts say this is a non starter and I see another comment posted that installing new cams will get you up to 110hp, I was wondering if these are the 115hp Eunos cams or say an aftermarket Piper or Kent cams? Your help would be much appreciated.
Marti
They are the cams from the earlier engine. If just changing cams daunts you, swap a complete head