Rotor modification
#26
Rotary Evolution
While I understand it would be ideal to replace rotors, housings, refinish irons, and all the seals, this would push the cost well into the range of making buying a reman the better option.
What seals are you referring to when you talk about the oversized ones that could slim down the clearances? From my understanding the goopy seals are the taller ones and would still require machine work to be done.
What seals are you referring to when you talk about the oversized ones that could slim down the clearances? From my understanding the goopy seals are the taller ones and would still require machine work to be done.
they are only marginally wider than stock and the slots can be filed by hand to clearance them to the wider seals.
#33
I still don't know how this is going to be handled... has anyone tried cold working the grooves back straight?
#34
It is possible they are too bad to be saved, although saying a rotor is a wear item is like saying that a piston is a wear item, which is a bit of a stretch.
And as far as the cold working goes, we were considering something more along the lines of jigging it up and using a press to make sure things stay even.
And as far as the cold working goes, we were considering something more along the lines of jigging it up and using a press to make sure things stay even.
#35
It is possible they are too bad to be saved, although saying a rotor is a wear item is like saying that a piston is a wear item, which is a bit of a stretch.
And as far as the cold working goes, we were considering something more along the lines of jigging it up and using a press to make sure things stay even.
And as far as the cold working goes, we were considering something more along the lines of jigging it up and using a press to make sure things stay even.
also the pistons wear in the same way a rotor does, the piston ring lands get Veed.
#36
In the same way that a block/crank/rod/any other part of an engine is a wear item... It's not like these are 60k mile service check boxes(well in the case of the RENESIS it would seem rotors are). It's one of those things that shouldn't be THE point of initial failure in a motor.
#37
In the same way that a block/crank/rod/any other part of an engine is a wear item... It's not like these are 60k mile service check boxes(well in the case of the RENESIS it would seem rotors are). It's one of those things that shouldn't be THE point of initial failure in a motor.
the WRX engines had a spell where they were breaking piston ring lands, even stock cars were failing, it was really bad
#38
I thought they were still having a bit of an issue with that to date, good thing you can swap them without any bottom end work on those motors. My point was just that rotors/pistons shouldn't be something that falls into the same category as even piston rings/rotor seals.
#40
I thought they were still having a bit of an issue with that to date, good thing you can swap them without any bottom end work on those motors. My point was just that rotors/pistons shouldn't be something that falls into the same category as even piston rings/rotor seals.
#42
Glad to here someone has managed to do it, did you take measurements on the seals before doing the milling so they would be correct to begin with? Also, do you mind sharing the width of the oversized seals so that I can measure the grooves in these rotors to make sure they aren't too far gone for that method to work?
#44
Roflcopter,
Ive got the same problem and Im thinking about the same - deeper rx8 2mm slots to get 3mm apex.
Did you finally did it?
My problem:
https://www.rx8club.com/series-i-tro...o-wide-253508/
Ive got the same problem and Im thinking about the same - deeper rx8 2mm slots to get 3mm apex.
Did you finally did it?
My problem:
https://www.rx8club.com/series-i-tro...o-wide-253508/
#45
No respecter of malarkey
iTrader: (25)
Glad to here someone has managed to do it, did you take measurements on the seals before doing the milling so they would be correct to begin with? Also, do you mind sharing the width of the oversized seals so that I can measure the grooves in these rotors to make sure they aren't too far gone for that method to work?
there's a post on here where I use a fence post as an example of why it works
installing thicker seals into sloppy grooves is just kidding yourself for whoever does it, so I'm glads it's their money & effort rather than mine
.
Last edited by TeamRX8; 06-19-2014 at 05:06 PM.
#46
Yeap its here for quite a long time but nobody shares their info about cut rotor reliability.
If rotor is factory hardened at apexes (and I bet it is) the enlarging process cuts out part/all? of this harder part so Im afraid if in a year or so there will be V shape slot again
If rotor is factory hardened at apexes (and I bet it is) the enlarging process cuts out part/all? of this harder part so Im afraid if in a year or so there will be V shape slot again
#47
No respecter of malarkey
iTrader: (25)
For the RX7 seals the slot is made deeper, not wider
https://www.rx8club.com/series-i-aft...8/#post3900082
https://www.rx8club.com/series-i-aft...8/#post3900082
#48
Out of NYC
iTrader: (1)
For the RX7 seals the slot is made deeper, not wider
https://www.rx8club.com/series-i-aft...8/#post3900082
https://www.rx8club.com/series-i-aft...8/#post3900082
Yeap its here for quite a long time but nobody shares their info about cut rotor reliability.
If rotor is factory hardened at apexes (and I bet it is) the enlarging process cuts out part/all? of this harder part so Im afraid if in a year or so there will be V shape slot again
If rotor is factory hardened at apexes (and I bet it is) the enlarging process cuts out part/all? of this harder part so Im afraid if in a year or so there will be V shape slot again
if it's older 3mm style, then its deeper AND wider.
if I gotta go 3mm one day, first thing I do is get ceramic apex, the higher compression spring alone will help to make up the sealing lost for using 3mm, as for the rotor groove, yes it's harden at the factory, no one knows sure if milling it to 3mm would remove it's reliability, it's probably not the end of the world, you can always get a harden treatment or something like WRC treatment.
#49
finally??? it was done at least 7 years ago if not earlier, was poo-poo'd for years after first mentioning it on the forum as a solution
there's a post on here where I use a fence post as an example of why it works
installing thicker seals into sloppy grooves is just kidding yourself for whoever does it, so I'm glads it's their money & effort rather than mine
.
there's a post on here where I use a fence post as an example of why it works
installing thicker seals into sloppy grooves is just kidding yourself for whoever does it, so I'm glads it's their money & effort rather than mine
.
We actually did end up doing this to his motor... long story short we have an MSP motor with rotors that have grooves cut to 3mm width with the stock height, then we ordered Atkins 3mm apex seals and cut them to the stock height for an MSP 2mm seal and matched the profile on the bottom to accept 3mm single apex springs instead of the dual setup the MSP uses. We also took some Atkins MSP solid corner seals and cut them wider to fit the 3mm seals as well.
The motor did not make good compression after being rebuilt in this configuration, although I don't think it's a direct cause of these modifications. The obvious issue it had to begin with blinded us to any other possible issues and it will come apart and get fully clearanced and we'll know why it's not making compression now. My money is on step wear on the irons, there was some you could feel. We also just trusted the shop to have everything cut properly and didn't bother with measuring the tolerances before assembly, and some of the apex's seemed a tad tight so maybe that is contributing as well.
It will be coming back out and looked through again eventually though, too many other projects currently on the table to both with that one right now.
#50
Although I don't drive a lot, I have had the Deeper Goopy seals in my rx8 for almost a year, all boosted, mostly drive it around town with boost and highway commute to work sometimes, I also took it on a 400mile round trip to a meet.
car is running great! It pulls good vacuum about (15inhg) on the gauge but I believe its more because the gauge rests above 0. idle is smooth.
car is running great! It pulls good vacuum about (15inhg) on the gauge but I believe its more because the gauge rests above 0. idle is smooth.