Mini Magazine - - Tech -

I’ve fit­ted a Metro engine to my Mini, and now there’s no by­pass hose on the head. Some­one has men­tioned to me that the coolant won’t flow around the engine un­til it gets warm and the ther­mo­stat opens. Would I be able to just drill holes in the ther­mo­stat to fix this is­sue? Or is there an­other, bet­ter, so­lu­tion? Ratty

Yes, that is quite cor­rect. The by­pass hose is there to fa­cil­i­tate coolant flow prior to the ther­mo­stat open­ing, par­tic­u­larly when the heater valve is closed off. Coolant cir­cu­la­tion is im­per­a­tive at all times to avoid lo­calised over­heat­ing, es­pe­cially around the com­bus­tion cham­bers. This is ex­ac­er­bated by the tem­per­a­tures reached around the ex­haust valve seats. Drilling a half dozen 3mm holes around the pe­riph­ery of the ther­mo­stat is any eas­ily so­lu­tion to the prob­lem.

Ther­mo­stat open­ing.

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