2mm rotors in a pre 86 motor

IH8DSM · 04-30-2010, 01:44 AM

would it work?

i have a pre 86 4 port motor and im wondering if i can put 2mm rotors or do i have to stick to the 3mm rotors if so why

Buggy · 04-30-2010, 05:57 AM

Should work just fine. I just did that exact same thing with my Rx-4 engine. I put S5 NA rotors into an early 4 port engine. I did use RB one piece carbon apex seals though, but I'm sure OEM ones would work fine as well. Good luck with your build.

IH8DSM · 04-30-2010, 10:49 AM

It runs no problems? no start problems or anything

Buggy · 04-30-2010, 10:57 AM

I'll let you know in a week or two when I get it running. I'm still waiting on the clutch to get here so I can put it all together. I don't forsee any issues with it. The thicker apex seals were used in the older engines just for durability as far as I know.

IH8DSM · 04-30-2010, 11:13 PM

Ok send me a pm or reply to this gonna start cleaning mine this week

PercentSevenC · 05-01-2010, 12:13 PM

Yeah, it works just fine. Lots of people do it. Just make sure you use the correct counterweights and everything, and you're good.

IH8DSM · 05-01-2010, 12:37 PM

excellent means i can have my motor built in a week or so instead of a month thanks for all the help

C. Ludwig · 05-01-2010, 08:06 PM

Apparently there is a difference in the troichiod shape of the rotor housing between the generations. However, a lot of people have done it with no issues, myself included.

Buggy · 05-02-2010, 06:48 AM

Quote:

Originally Posted by C. Ludwig

Apparently there is a difference in the troichiod shape of the rotor housing between the generations. However, a lot of people have done it with no issues, myself included.

Huh, interesting. I wonder what the difference is, and between what models of engines. I should have compared my old school housings with some FC housings I have laying around before I built my engine. It can't be that big of a difference.

04-30-2010, 01:44 AM	#1
IH8DSM RCC Contributor Join Date: Mar 2008 iTrader: (0) Posts: 610 Rep Power: 17	2mm rotors in a pre 86 motor would it work? i have a pre 86 4 port motor and im wondering if i can put 2mm rotors or do i have to stick to the 3mm rotors if so why __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

04-30-2010, 05:57 AM	#2
Buggy I've been Wankeled! Join Date: Apr 2010 Location: Mildmay, Ontario, Canada iTrader: (0) Posts: 260 Rep Power: 15	Should work just fine. I just did that exact same thing with my Rx-4 engine. I put S5 NA rotors into an early 4 port engine. I did use RB one piece carbon apex seals though, but I'm sure OEM ones would work fine as well. Good luck with your build. __________________ 1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place 1974 Rx-4 all original 27,000 miles 1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place

04-30-2010, 10:49 AM	#3
IH8DSM RCC Contributor Join Date: Mar 2008 iTrader: (0) Posts: 610 Rep Power: 17	It runs no problems? no start problems or anything __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

04-30-2010, 10:57 AM	#4
Buggy I've been Wankeled! Join Date: Apr 2010 Location: Mildmay, Ontario, Canada iTrader: (0) Posts: 260 Rep Power: 15	I'll let you know in a week or two when I get it running. I'm still waiting on the clutch to get here so I can put it all together. I don't forsee any issues with it. The thicker apex seals were used in the older engines just for durability as far as I know. __________________ 1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place 1974 Rx-4 all original 27,000 miles 1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place

04-30-2010, 11:13 PM	#5
IH8DSM RCC Contributor Join Date: Mar 2008 iTrader: (0) Posts: 610 Rep Power: 17	Ok send me a pm or reply to this gonna start cleaning mine this week __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

05-01-2010, 12:37 PM	#7
IH8DSM RCC Contributor Join Date: Mar 2008 iTrader: (0) Posts: 610 Rep Power: 17	excellent means i can have my motor built in a week or so instead of a month thanks for all the help __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

05-01-2010, 08:06 PM	#8
C. Ludwig Rotary Masochist Join Date: May 2008 Location: Floyds Knobs, IN iTrader: (5) Posts: 494 Rep Power: 17	Apparently there is a difference in the troichiod shape of the rotor housing between the generations. However, a lot of people have done it with no issues, myself included. __________________ _______________________________________________ *One stop Haltech, AEM, Syvecs shopping. Installation and tuning.* http://www.lms-efi.com *Free support. Drop us an email.* chris@lms-efi.com 502-515-7482 Facebook @LMS-EFI