AWESOME tech article on the WRC engine(56K go make some popcorn.)
08-20-2004, 07:44 AM
#16
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Originally Posted by Barchetta212
Sodium cooled valves are filled with a sodium compound. Not sure of the chemical characteristics that allow the cooling properties. Any chemists out there??
08-20-2004, 07:48 AM
#17
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Originally Posted by fusionsr
Whee! A biochemist here, but close enough. Actually, filling the valves with sodium allows the valves to cool better because the sodium liquifies at operating temps and allows convective cooling to occur, as opposed to the conductive cooling of solid valves Sweet, eh?
Damn right that's sweet! Thanks!
Never thought I'd have such a quick answer to that question! I guess I'm too acustomed to the intellegence level in other forums... [:wink:]
08-20-2004, 08:05 AM
#21
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Originally Posted by nKoan
For daily street driven cars, I'd probably say that a water spray on the intercooler is 'better' then a water (or alcohol) injection. Its cheaper, and you will probably get the same results.
Water spray only helps if your IC is heatsoaked. It can help prevent loss of power.
Water Injection helps prevent detonations during combustion. It's like having higher octane gas and can increase power if tuned properly.
08-20-2004, 08:41 AM
#22
The article actually kinda compares the two (not a main point, but it pops up). It says that Subaru runs a water injection and other teams run a water spray to acheive the same effect. Both effectively let you run higher boost for higher amounts of time. How they do it is different, of course, but the end result is close to the same.
Krinkov, I saved the article. I'll edit your posts so your picture links point to my web hosting.
Krinkov, I saved the article. I'll edit your posts so your picture links point to my web hosting.
Last edited by Nick Koan; 08-20-2004 at 08:44 AM.
08-24-2004, 04:42 PM
#24
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Originally Posted by peter head
It is a good thread, I wonder if anyone want to try these setups on their engine?
08-24-2004, 05:03 PM
#26
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Car Info: Subaru Impreza WRX 2002
No, that's not a good comparison; the WRC engines get torn down and rebuilt constantly, after every major race. I bet no part in those engines stays in for more than 10k miles, if the car itself lives that long.
08-24-2004, 06:15 PM
#28
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Originally Posted by nKoan
The article actually kinda compares the two (not a main point, but it pops up). It says that Subaru runs a water injection and other teams run a water spray to acheive the same effect. Both effectively let you run higher boost for higher amounts of time. How they do it is different, of course, but the end result is close to the same.
However, none of this carries over to the street anyway. They are running boost pressures which are very efficient at high rpms - most people on the street are running very inefficient pressures on their turbos at high rpms. Pushing an engine without purpose built (bespoke :hee: funny English) parts into inefficient ranges benefits even more from water injection. Like my wagon that ran 20psi on a td-04 or 24psi on a vf-30.
08-25-2004, 03:20 PM
#30
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Relative to many other components the cost "saved" in hardware would not be much. However, the extra gasoline used for cylinder cooling will cost significant amounts in many metrics. I have given up trying to understand the FIA or any other sanctioning body and the decisions they make regarding their premier series.