Chris Wilson Posted January 17, 2017 Share Posted January 17, 2017 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... Quote Link to comment Share on other sites More sharing options...
ripped_fear Posted January 17, 2017 Share Posted January 17, 2017 EDIT- ignore my post its isnt the one i was thinking of Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted January 17, 2017 Share Posted January 17, 2017 IACV heater hose Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 17, 2017 Share Posted January 17, 2017 that or off to the oil filter/cooler housing? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 17, 2017 Author Share Posted January 17, 2017 IACV heater hose A deerstalker is in the post, he's just confirmed this shows the stub he's on about and he's found connection on the IACV. I am in Merc AMG mode this week and had forgotten the IACV is also heated as well as the TB. Thanks Swampy and thanks Ripped! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 17, 2017 Author Share Posted January 17, 2017 that or off to the oil filter/cooler housing? I suggested that myself, but not long enough, we have it now though, cheers Scooter Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted January 17, 2017 Share Posted January 17, 2017 Ive taught Chris Wilson something. I feel, a bit odd... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 17, 2017 Author Share Posted January 17, 2017 If you saw some of the somewhat scathing posts from experts that try and help me fumble around with amateur radio you would soon see I have a huge amount to learn Thanks from me and the Kraut! Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted January 17, 2017 Share Posted January 17, 2017 Out of interest, why does the IACV need a heater hose? And the TB for that matter? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 18, 2017 Author Share Posted January 18, 2017 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. Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted January 18, 2017 Share Posted January 18, 2017 Ah right, thanks for the info Mr Wilson Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 18, 2017 Author Share Posted January 18, 2017 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. Quote Link to comment Share on other sites More sharing options...
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