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The mkiv Supra Owners Club

Does anyone recognize this hose description and where it should go?


Chris Wilson

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I have an acquaintance that is putting a TT none VVTi engine back in a shell he bought with the engine in bits. He is new to the MKIV but seems to have it nearly done. He is German and does not write good English, so I had him e-mail in German and I got my pal who speaks and reads it fluently translate, so the chance of error or misunderstanding is zero (yeah, right.... ;))

 

"There is an about 22mm metal water pipe that runs around the back of the engine, just below the head to block interface. At the intake side of the engine a roughly 8mm bore, shaped (moulded?) rubber hose comes off a pipe stem (stub?) on the metal pipe. It has a spring clip tensioner (one of those plier job hose clamps Toyota love?). To whereupon does this hose go, it looks like it could reach something under the manifold chamber (plenum?)."

 

 

I am not sure what he's describing, well a hose, I know that, but "whereupon" does it go? I am having a mental blank at the moment, so come on Sherlocks of the forum, can we help him out please? I have asked for a photo, but nothing has come through yet. It can't be anything too critical as he says it starts, but I am not sure if he has a rad and water in it yet as he's asking where he get a rad from...

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In cold damp climates throttle bodies and their butterflies, and presumably the idle control valve plunger can ice up and stick. A stuck open throttle on a 300 plus BHP engine is rarely good news, so makers add heating from the engine coolant system. I built a Volvo turbo engine years ago that would ice up the TB on really cold mornings, it took me a while to realize it was icing up and not a mechanical stiction issue.

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Icing is far more likely on carburetted engines as they employ a venturi to create a pressure drop across the jets to draw fuel. The pressure drop combined with an increase in air velocity makes the moisture laden air much more prone to getting below zero C. Nonetheless a straight bore throttle body still causes some pressure variation inlet to outlet and can ice up, I would always recommend leaving the heat hoses connected on any road car that has them, and any competition car likely to see use in a cold climate.

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