Anyone have any experience or (first hand) knowledge about these rotors?
I'm really interested in getting coated/treated rotors to help diminish/stop the inevitable rust, but still want a quality rotor.
They claim to be "Mill balanced (within 150 g/cm)". Does that really mean anything or is it just fancy facts to sound like quality?
Rotora Rotors
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Q45tech
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Quality is hard to measure visually as there are so many different low cost grades of cast iron. You have to measure the ratio of solid metal to air space in vented rotors plus xray the unit to see the quanity and shape of the internal curved spiral vents [vane structure].http://www.advancedcooling.com/caststeel.html
"Discs should have curved vans and both greater thermal storage capacity and better airflow characteristics than OEM - otherwise you will not have achieved anything worthwhile. Depend on actual test results, not advertising claims. Discs should be mill balanced to less than 0.75 ounce-inch (54 g-cm), run out should be less than 0.002" (0.051 mm) and thickness variation should be less than 0.0007" (0.018 mm). On race applications these tolerance are typically reduced to .25 ounce-inch, 0.0005" and 0.0001" respectively"http://www.stoptech.com/whitep...1.htm
!!!!!!!!!!!It appears as thes disc are very low quality as their mill balancing specs are 3 TIMES worse than oem [54g/cm] minimums and almost 10 times worse than the absolute best quality available.
People use printed specs when they know the buying public is ignorant of the facts.
Interesting they charge a lot and are the rave of Honda owners shows few know about rotorshttp://www.autocarparts.com/part/1233/43
http://www.balancetechnology.c....html
"Discs should have curved vans and both greater thermal storage capacity and better airflow characteristics than OEM - otherwise you will not have achieved anything worthwhile. Depend on actual test results, not advertising claims. Discs should be mill balanced to less than 0.75 ounce-inch (54 g-cm), run out should be less than 0.002" (0.051 mm) and thickness variation should be less than 0.0007" (0.018 mm). On race applications these tolerance are typically reduced to .25 ounce-inch, 0.0005" and 0.0001" respectively"http://www.stoptech.com/whitep...1.htm
!!!!!!!!!!!It appears as thes disc are very low quality as their mill balancing specs are 3 TIMES worse than oem [54g/cm] minimums and almost 10 times worse than the absolute best quality available.
People use printed specs when they know the buying public is ignorant of the facts.
Interesting they charge a lot and are the rave of Honda owners shows few know about rotorshttp://www.autocarparts.com/part/1233/43
http://www.balancetechnology.c....html
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Q45tech
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You asked for [pointed out] specs [150 g/cm] is in the throw up range.
Have used PowerStops since 1995 [for the last 200,000 miles 4 sets]. They are adequate and weight the same as oem even with the holes......so the iron quality must be equal or a tiny tiny bit better.
Unfortunately in the same diameter/thickness hard to get very much improvement but every few percent adds up.
Weigh a set of newer LS430 [MB/BMW V8]rotors [if you can pick them up], almost 6 pounds heavier...........35% heavier.
Have used PowerStops since 1995 [for the last 200,000 miles 4 sets]. They are adequate and weight the same as oem even with the holes......so the iron quality must be equal or a tiny tiny bit better.
Unfortunately in the same diameter/thickness hard to get very much improvement but every few percent adds up.
Weigh a set of newer LS430 [MB/BMW V8]rotors [if you can pick them up], almost 6 pounds heavier...........35% heavier.
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Q45tech
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1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Getting 5% cooler rotor temperature would be a tremendous gain!
6 inch shorter stopping distance is material in a rear end collision, but then again if you could react 1/200th of a second faster or push 10 pounds harder in the first 0.5 seconds of brake application or your tires were softer by 2%............rotor temp wouldn't matter.
Lots cheaper to buy gummy fast wearing tires than to redesign a brake system to get the same effect. Not sure its possible as almost all brake systems will lock oem tires
6 inch shorter stopping distance is material in a rear end collision, but then again if you could react 1/200th of a second faster or push 10 pounds harder in the first 0.5 seconds of brake application or your tires were softer by 2%............rotor temp wouldn't matter.
Lots cheaper to buy gummy fast wearing tires than to redesign a brake system to get the same effect. Not sure its possible as almost all brake systems will lock oem tires
Q45tech wrote:You asked for [pointed out] specs [150 g/cm] is in the throw up range.
Have used PowerStops since 1995 [for the last 200,000 miles 4 sets]. They are adequate and weight the same as oem even with the holes......so the iron quality must be equal or a tiny tiny bit better.
Unfortunately in the same diameter/thickness hard to get very much improvement but every few percent adds up.
Weigh a set of newer LS430 [MB/BMW V8]rotors [if you can pick them up], almost 6 pounds heavier...........35% heavier.
Dennis - Thanks for your comments and input. Very much appreciated
.Can I take from your comments that LS430 rotors would help, but would they fit with little or no modifications?
<as always your knowledge is very helpful>
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Q45tech
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1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Pretty hard to have much weight variance in oem sized rotors, as the diameters and various thicknesses are closely defined. The hat can't be much thicker or the lugnuts won't work.
Have seen many aftermarkets lighter by a pound [6-7%], a few equal, and very very few heavier by ALMOST pound.
Cast iron from worst to most dense wouldn't have a 7% weight variance [1 pounds].
http://homepage.ntlworld.com/o...i.htm
Sometimes factory rotors have heat rejection groves /slots [on the inside] where the rotor transforms to the center hat.......this limits conductive transfer to the hubs/wheel bearings. Letting the rotor get a little hotter while saving the bearings stress.
Have seen many aftermarkets lighter by a pound [6-7%], a few equal, and very very few heavier by ALMOST pound.
Cast iron from worst to most dense wouldn't have a 7% weight variance [1 pounds].
http://homepage.ntlworld.com/o...i.htm
Sometimes factory rotors have heat rejection groves /slots [on the inside] where the rotor transforms to the center hat.......this limits conductive transfer to the hubs/wheel bearings. Letting the rotor get a little hotter while saving the bearings stress.
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HeavyDuty
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95 Nissan 240SX S14
96 Nissan D21
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Rotora's kind of funny. They portray a Japanese culture, but you'll never get them to admit they're produced in Korea or Taiwan.
I've used, installed, a set of their big brake kits (with 4 piston calipers) nice setup for the money. Time will tell how they hold up over time, as well as whatever support you get (or don't) when you need service parts.
I, too have used Brembo and Power Stop with good results.
I've used, installed, a set of their big brake kits (with 4 piston calipers) nice setup for the money. Time will tell how they hold up over time, as well as whatever support you get (or don't) when you need service parts.
I, too have used Brembo and Power Stop with good results.
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maxnix
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1995 Infiniti Q45t
2000 Infiniti Q45
From http://www.nissaninfiniticlub....illen :Q45tech wrote:Pretty hard to have much weight variance in oem sized rotors, as the diameters and various thicknesses are closely defined. The hat can't be much thicker or the lugnuts won't work.
Have seen many aftermarkets lighter by a pound [6-7%], a few equal, and very very few heavier by ALMOST pound.
Cast iron from worst to most dense wouldn't have a 7% weight variance [1 pounds].
http://homepage.ntlworld.com/o...i.htm
Sometimes factory rotors have heat rejection groves /slots [on the inside] where the rotor transforms to the center hat.......this limits conductive transfer to the hubs/wheel bearings. Letting the rotor get a little hotter while saving the bearings stress.
Rotor Weight comparison
Upon request I weighed both the factory rotors & the Stillen X-drilled:Factory: 14.5 Lbs EaStillen: 17 Lbs Ea
Rex, where are you? You're the Search King.__________________Brian1995 Q45 & Q45t & 2000 Q45
Discover the power of the button!
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Q45tech
- Moderator
- Posts: 14296
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
All the front rotors we buy including the factory* weight 16-17 pounds Stillen, Power Stop, Brembo, even the 2 off brand Chinese made units we offer for the budget minded.
* However I haven't seen a brand new factory rotor in a year or two but the last time I weighted one it was 16+ pounds.
Maybe some one can weight them again?
We are very careful to make sure that the parallel metal surfaces are at least 9.5 mm thick and the air space is 9mm.........those 8.8/10.4 air spaces get you every time..
* However I haven't seen a brand new factory rotor in a year or two but the last time I weighted one it was 16+ pounds.
Maybe some one can weight them again?
We are very careful to make sure that the parallel metal surfaces are at least 9.5 mm thick and the air space is 9mm.........those 8.8/10.4 air spaces get you every time..
maxnix wrote:From http://www.nissaninfiniticlub....illen :
Rotor Weight comparison
Upon request I weighed both the factory rotors & the Stillen X-drilled:Factory: 14.5 Lbs EaStillen: 17 Lbs Ea
Rex, where are you? You're the Search King.
I feel I'm becoming the Fred(Oil) of Search:D, always glad to as "it's" my contribution.
Funny thing is I found ^that^ thread when I searched about rotors before posting my question about Rotora
. Just didn't see the weight numbers, as I was looking for the word "Rotora".I guess I'll check with Joe to see if he's got any of the drilled ones left.
THANKS GUYS