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chrome cylinder walls

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westwind1124

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Discussion starter · #1 ·
I was just curious if any one has tried chroming their cylinder walls on a 1G talon TSi. I am a pilot and I know that chroming cylinder walls, as opposed to the normal nitride hardening on an aircraft engine, is beneficial. Especially on an engine that has substantial amount of engine time on it. The chrome forms microscopic cracks that will hold oil when the engine is not running and reduces wear at startup. I would like to know if anyone has tried this and what the thought of the results. I have been looking in to doing this unless some one has good reason other wise.

Thanks

Brent
 
#3 ·
I don't think it makes things weaker, but they won't dissapate heat as easy. The only people I've personally heard about chroming the cylinders are Snowmobile dragracers. I have never even heard about anyone doing this on cars at all.
 
Discussion starter · #5 ·
well I haven't heard of any one doing it to cars either but like I said I know its a very common thing in aviation. As far as heat dissipation goes I don't think it really affects it either way. Thanks for the input though. I was just curious if any one has tried it or not. I will have to do some more pokin around I guess.
 
#6 ·
ProjectGSX said:
Don't let the NT guys hear about this - they will do it to their showcars. :eek:
Click to expand...
lol.

sounds plausible, though. i'll ask my friends' gf's dad. he chromes shit for a living. maybe i should try it on one of my motors.
 
#7 ·
chrome does DRAMATICALLY effect heat dissipation. When I worked in the Watervliet arsenel designing tank gun tubes, the insides are chrome plated so when the shell is fired the heat dosent melt/warp the tube. Structurally, chrome plating wont do much, chrome itself is pretty strong. But it's heavy and a environmental hazard. The heat will be reflected by the chrome, so I'd expect the piston to get warmer as well as the head. I'd say it's a bad idea, on stuff like aviation it's good, and on small engines, sure, it can help, but I'd say why bother on our cars.
 
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#8 ·
It also makes you think if its cost effective enough to engage in cromeing your cyc. walls.
I give you a thumbs up for thinking along that line.
:D Who know you might revolutionize the aftermarket greed for more crome. Especially on NT cars.:eek:
 
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#10 ·
Not if you chrome the pistons too :). The ability of chrome to reflect radiant heat would actually be a benefit in this case...the block does not absorb usable heat and thus the thermal efficiency of the engine is increase. Especially if you thermal coat the rest of your system, i.e. piston top, combustion chamber and valves to withstand the extra heat, I can't see how it could be too much of a problem. Besides, I doubt if the increase in heat would exceed that caused by..say...a shot of nitrous.
 
Discussion starter · #11 ·
Chroming the cylinder walls sounds to me like something that ought to be tried. I don't know how much benefit would be gained out of doing the top of the pistions though. The major benefit of the chrome cylinder walls is that forms microscopic cracks that hold oil. That would improve lubrication at startup and while running. I don't think that the performance envelope would improve much but atleast the wear would be reduced. Perhaps a combonation of chroming the walls and then ceramic coating the pistons would be best. And then if your really ambittious, get the skirts teflon coated. If its cost effective enough I think it would be worth it, especially if you get it done for free.
 
#12 ·
Chroming is a very sound process to reduce many ugly things about combustion chamber dynamics, but the cost is usually VERY prohibitive. An alternative would be Titanium Nitriding which has a much higher toughness with comparable thickness, while being much cheaper and much more 'Green' friendly.

Chrome Film (Cr) - 4 to 6 um (or m*10^-6) - Young's Modulus = 40 .. 120 GPa

Titanium Nitride (TiNx) - 4 to 6 um - Young's Modulus = 243 .. 295 GPa

The result will be a much stronger cylinder wall, but the problem of detonation will still remain. The pressure wave of detonation kills the rotating assembly and when you reduce the heat rejection capability of the block you increase the likelyhood of detonation. This requires a whole slew of additional issues that need to be addessed.
 
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