engine and drivetrain 1.8 Cylinder head uses

[Hans]

I have a 1.8 head from an E21 320i sitting on the shelf. Is it at all compatible with earlier M10 motors, and if so, with which pistons? Maybe I should just recycle?

[Harv]

Injector ports in the head or the intake manifold? Come to think of it, I don't know if there is a difference in the combustion chambers between the two. I have heard/read that the e30 1.8 M10 head flows the best in stock form but has the lowest comp ratio as it has the largest combustion chamber. If your going to use custom pistons and stroke I would guess it's the one to use. 

 

John

[Chamonix72]

Find a guy going turbo. I hear the 1.8 heads work well for that application.

[burndog]

The e30 head had direct injection in the head. I plugged them and am running a later model fuel injected intake manifold to get larger injectors into mix.


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[TobyB]

Quote

The e30 head had indirect injection in the head.

Fixed that for ya.  Direct is where it shoots into the combustion chamber, a la diesel.

 

The 1.8 head flows well.  Ireland makes a piston with a bump so that you can use it with a 2l crank. 

It's at least as good as an E12 or E21 head, and as John and David say, has a lot more 'open' chamber shape

so it's less prone to detonation from hot spots.  I hang onto any M10 head in decent shape, as they're not making any more,

and they're all usable now that custom pistons are hardly any more than stock pistons.

 

They aren't worth a whole ton, but they probably will be, eventually...

 

t