Hey guys I just received my aftermarket coolant temp sensor adaptor and im just querying whether this may cause a reduction in the flow of my coolant.. the Internal Diameter is 25mm and the OuterDiameter is 40mm what are your thoughts? could this be a bad idea?
That is definately smaller than the rad hose ... so yes it will impede flow to some extent. The reduced flow causes a slowdown of the hot water coming out of the intake resulting in possibly a slightly higher operating temp due to hot water staying in the block a little longer. Of course, it might have a reverse effect and cool things down a little due to the fact that the water has more time to leach heat out of the block ... but my money is on it increasing temps. How much is anyone's guess. Now that you will have a proper measuring guage you can see for yourself. I'd give it a go. Of course in present cooler weather, you won't know how it copes in summer?
If the reduced neck was a significant length I'd be agreeing with you Mark but in this case the restriction is extremely short compared to the total return distance from out of the engine thru the radiator and back in. My money is on it having no effect whatsoever.
Just get a bigger one. A few companies make these in a range of sizes. I know Greddy make them in 34mm and 36mm.
Worst case scenario ... Minor back-pressure causes mild cavitation at the pump. In an otherwise healthy cooling system it shouldn't be a problem.
