For all you rotary guys...
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From: Chesapeake
For all you rotary guys...
I always wondered if a 3mm seal was worth it on the rotor but some guy on Rx7club.com was very knowledgable...
"Yes, its impossible to get them milled correctly, I dont care who is doing it. Yes its possible to get the apex seal slot to the correct width, however all the rotors I have seen milled end up with hour glass shaped slots. On top of that its more than just the right width, its getting in the right place on the rotor, so the corner seal relationship is right, and doesnt bind the apex seal up.
. As posted previously, you are removing the hardened edge of the seal slot, the tolerances are not guaranteed to be there after milling, and with the seal slot soft, will quickly wear to past tolerance again.... Then comes the fact that 3mm seals will float and chatter alot earlier than 2mm seals... In the end it doesnt have any safety benefits, the damage just shows up somewhere else, doesnt it make more sense to spend the time tuning out of the damage zone rather just shifting the damage around to the next place.. From my experience 3mm dont survive any better than 2mm anyway when it comes to detonation.. All the motors I have seen with broken apex seals were all 3mm motors..
3mm seal will retain more heat than a 2mm seal and is more likely to show greater effect from thermal stress than a 2mm, that is one of the key reasons mazda moved to the 2mm on the high output turbo motors.
Spend the money on tuning..
On my last Japan tour, I asked every shop I spent time at the same question
Knightsports=2mm
I-feelin=2mm
KKM=2mm
RE amemiya=2mm
Revolution=2mm
Arena=2mm
Irs=2mm
RS pantera=2mm
Anniversary racing factory=2mm
I could not find one shop that would back the retrofitting of 3mm seals, they all responded with generally the same answers which I gave you above along with "tune it properly"... Which I did, 20 psi on pump gas grocery getter with 2mm seals...
The 3mm seal thing is a hack fix, when someone detonates a piston motor, do you get the ring lands machined for bigger heavier rings, nope..You learn not to detonate the motor, same applies to the rotary, heavier rings/apex seals hurts seal and performance, so you end up pushing things further to try and regain power that is lost through added weight and inferior sealing..
I've had 3mm motors, 2mm aftermarket seals and 2mm stocks seals, nothing seals as good or makes as much power as stock 2mm seals...Max"
Very enlightening!!!
"Yes, its impossible to get them milled correctly, I dont care who is doing it. Yes its possible to get the apex seal slot to the correct width, however all the rotors I have seen milled end up with hour glass shaped slots. On top of that its more than just the right width, its getting in the right place on the rotor, so the corner seal relationship is right, and doesnt bind the apex seal up.
. As posted previously, you are removing the hardened edge of the seal slot, the tolerances are not guaranteed to be there after milling, and with the seal slot soft, will quickly wear to past tolerance again.... Then comes the fact that 3mm seals will float and chatter alot earlier than 2mm seals... In the end it doesnt have any safety benefits, the damage just shows up somewhere else, doesnt it make more sense to spend the time tuning out of the damage zone rather just shifting the damage around to the next place.. From my experience 3mm dont survive any better than 2mm anyway when it comes to detonation.. All the motors I have seen with broken apex seals were all 3mm motors..
3mm seal will retain more heat than a 2mm seal and is more likely to show greater effect from thermal stress than a 2mm, that is one of the key reasons mazda moved to the 2mm on the high output turbo motors.
Spend the money on tuning..
On my last Japan tour, I asked every shop I spent time at the same question
Knightsports=2mm
I-feelin=2mm
KKM=2mm
RE amemiya=2mm
Revolution=2mm
Arena=2mm
Irs=2mm
RS pantera=2mm
Anniversary racing factory=2mm
I could not find one shop that would back the retrofitting of 3mm seals, they all responded with generally the same answers which I gave you above along with "tune it properly"... Which I did, 20 psi on pump gas grocery getter with 2mm seals...
The 3mm seal thing is a hack fix, when someone detonates a piston motor, do you get the ring lands machined for bigger heavier rings, nope..You learn not to detonate the motor, same applies to the rotary, heavier rings/apex seals hurts seal and performance, so you end up pushing things further to try and regain power that is lost through added weight and inferior sealing..
I've had 3mm motors, 2mm aftermarket seals and 2mm stocks seals, nothing seals as good or makes as much power as stock 2mm seals...Max"
Very enlightening!!!
Refugee
Joined: Jan 2004
Posts: 1,129
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From: BrookLAWN, 757
Re: For all you rotary guys...
Originally Posted by Qwiksillva
"Yes, its impossible to get them milled correctly, I dont care who is doing it.
nothing seals as good or makes as much power as stock 2mm seals..."
nothing seals as good or makes as much power as stock 2mm seals..."
Did he need to say anymore?
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