On the intake manifold of the last two cylinders, closest to the firewall, there two fittings that vent the intake tract to the outside. Does anyone know the purpose of these things? Are they particular to the B12 or do the B20 motors have the same?
Are they there to lean out the mixture to the rear cylinders? I don't know if they should be sealed with caps or left open.
Any assistance would be appreciated.
B12 Engine
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Brian Long
Re: B12 Engine
Ralph,
Do you mean the tappings on the narrow edge of the manifold flange? If so, one is used for vacuum operated windscreen washer. The other should have a brass screwed plug in it. Under the manifolds, beneath the inlet tracts, are two more tappings. These are for draining excess fuel away. Make sure that you fit these before refitting the heads!
Cheers,
Brian
Do you mean the tappings on the narrow edge of the manifold flange? If so, one is used for vacuum operated windscreen washer. The other should have a brass screwed plug in it. Under the manifolds, beneath the inlet tracts, are two more tappings. These are for draining excess fuel away. Make sure that you fit these before refitting the heads!
Cheers,
Brian
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Brian Long
Re: B12 Engine
Did you see the write-up of the B12 engine in Issue 148 of Auto Italia?
Regards,
Brian
Regards,
Brian