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Jac Mac · 10-19-07, 09:07 PM

I would suggest reducing the size of the fittings for the bleeds out of the rear of the heads to around -3 or 3mm per side. These are meant to be 'steam ' vents only and by using the -6 fittings your T/stat will never function as intended . You will also be creating a condition where the front half of each cyl head may run hotter than desired due to lack of coolant flow in that area. Your By-Pass must be configured in a manner that coolant is brought close to the thermostat bulb while in the by-pass mode to enable 'real temp' signal to the T/stat rather than an isolated pocket of coolant that creats unnecessary 'on/off' cycling of the t/stat.

Jac Mac

10-19-07, 09:07 PM	#51 (permalink)
Jac Mac jac mac 10 tenths Join Date: Dec 2005 Location: Gore N.Z. Posts: 1,693 Rep Power: 21	Re: Roaring Forties #80 Reborn!!!! I would suggest reducing the size of the fittings for the bleeds out of the rear of the heads to around -3 or 3mm per side. These are meant to be 'steam ' vents only and by using the -6 fittings your T/stat will never function as intended . You will also be creating a condition where the front half of each cyl head may run hotter than desired due to lack of coolant flow in that area. Your By-Pass must be configured in a manner that coolant is brought close to the thermostat bulb while in the by-pass mode to enable 'real temp' signal to the T/stat rather than an isolated pocket of coolant that creats unnecessary 'on/off' cycling of the t/stat. Jac Mac