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Old 11-15-2010, 07:59 PM   #1
JustJeff
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The numbers are all
FD rotor
.080
.080
.085-.090

What I found after more measuring is that the measurement on the damage varies depending on location along the groove's damage and also how deep I take the reading. Obviously with the damage the edge of the groove angles a bit so that the top is a higher number than the same spot but a touch deeper. At it's worst I found .090. I still haven't looked in my FSM or Haynes, I got home last night and realized I had work to do for this coming work week.

I have the day off tomorrow and am planning to take the rotors to a machine shop. I bought my tool from Harbor Freight and would trust a machine shops tools more.

Last edited by TitaniumTT; 11-15-2010 at 10:07 PM.
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Old 11-15-2010, 10:05 PM   #2
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The way I measure the grooves is with the Apex seal installed and a feeler gauge. Check out the FSM and report back to us. That will probably give you more of an understanding of the amount of gap. Because you're right, that little bit isn't much for concern, but I bet when you get the seal in place and THEN measure the gap, it'll make more sense.


I'll delete your previous post for you.
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Old 11-18-2010, 12:07 AM   #3
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OK...well it appears I was onto the right idea first time I checked clearance. My first pics are of the feeler gauges on the corners. I put them in angled the top towards the middle as far as they would go. Like I was trying to slide them across the groove.

I checked out the FSM and I think I'll be referring to it more often. My Haynes has a handy page of tolerances but no description on how to go about getting those.

So I've got corner seals and plugs in, apex springs and seals in.

FD rotor on the bad corner
.011-.012-the tip of the feeler barely fits and can't go beyond where the damage is on the edge of the groove.

FD rotor same groove but on the good corner
.005-.006-gets about the same amount of contact...barely fits on the very tip

As far as sliding the feeler gauge all the way to the bottom of the groove. On the corners .002 is the only one that can do that.

I'm probably over thinking this again. But on the corners I can fit the feelers much easier. Probably because my old apex seals are OEM 3-piece. The top half can move a smidge.

With that in mind it seems the groove is within spec...except on the damage. Also the higher clearance is also only at the top where the damage is. The groove isn't uniform. The groove tapers out near the top cause of the damage. Max clearance according to FSM is .059.
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Old 11-18-2010, 07:54 AM   #4
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Did you change units on us or miss an extra zero?
0.059?
0.059mm?
0.0059"?



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because you're only as good as your backup
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Old 11-18-2010, 07:56 AM   #5
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That's what aI was wondering.....
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2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
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1988 FC Coupe - Gretchen -The attention whore BEAST!


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I'm pure Evil
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I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
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Old 11-18-2010, 02:49 PM   #6
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Quote:
Originally Posted by RETed View Post
Did you change units on us or miss an extra zero?
0.059?
0.059mm?
0.0059"?



-Ted
Quote:
Originally Posted by TitaniumTT View Post
That's what aI was wondering.....
Don't read what I wrote, read my mind and what I meant


FSM max clearance is .0059, but all the other numbers I posted are correct.

But again the thinest feeler gauge that I could slide was .002. That was the thinest feeler I own and moving it was difficult. Once the feeler got closer to the center of the groove it got hard to slide and was likely to tear.

What I noticed on all my rotors both good grooves and bad grooves is that on the corners it was much easier to get thicker feelers in the groove corner but was unable to slide them. Even on the good corners I could get between .005 and .006 into the groove to varying depths. On the damaged FD I just kept going higher and higher with feelers till I couldn't get anything wedged into the groove.

What I found is that the damaged groove isn't uniform. At the bottom of the groove it is consistent with the good grooves. But at the top I have more room as it tapers out due to the damage.
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Old 11-18-2010, 11:44 PM   #7
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Me thinks my perfectionism has overcomplicated this whole process
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Old 11-19-2010, 09:53 AM   #8
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No it hasn't. You've got twice the max allowed (per the FSM) clearance at the bad corner.... what does that tell you? It tells me that per the FSM, that rotor is junk.

There have been some great points brought up about reusing them, carbon buildup, reliability, etc etc etc. It's all personal preferance.

Personally.... I wouldn't use that rotor. but that's me. Others said that they have, and have with some degrees of sucess..... It's up to you.

You are forgetting a forth option though........ Get them milled out for 3mm seals.
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-
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Old 11-20-2010, 12:38 AM   #9
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^TTT

My concern regarding the clearance is the difference between the top where the damage is and the bottom where it's same measurement as my good grooves. I don't want to pay shipping back to the seller and have him tell me it's in spec because the bottom of the groove is in spec.

I'm not wanting to go 3mm. I don't live near any rotary shops or machine shops that have any experience with "das wankel" That means shipping two rotors out and back..along with labor costs for milling.
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Old 12-07-2010, 04:09 PM   #10
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Update....seller inspected the returned rotor and has different one on it's way back to me.
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