motor differences

Rotary_Rocket_87 · 06-04-2008, 08:06 PM

I have been searching for a while on this one. Every thread that I have read that mentions the differences of S4 and S5 engines only state that the intakes are different and if it has EGR it is S4. The only thing I have found to help determine which series a shortblock is that the spark plugs aren't located the same on S4 and S5 rotor housings. Mazda moved them on the S5, but I can't find an info on how they moved them (measurements). Does anyone have anything else?

TehMonkay · 06-04-2008, 09:03 PM

Coolant temp sensor is different, has a bannana plug on S4 and spade on S5, also there is an indentation in the front cover for the S5 waterpump.

The clutch fan has more blades on the S5, I think 8 S4 10 S5.

If the injectors are on it, S4 has square top injectors, with EV-1 connectors, S5 has more of a rounded shape to the connector.

RETed · 06-04-2008, 10:31 PM

http://fc3spro.com/TECH/FAQ/ZVK/zvk.html

-Ted

N.RotaryTech · 06-05-2008, 06:48 AM

Nice link.

Rotary Rocket did mention a "short block"
N/A or Turbo though?

Rotary_Rocket_87 · 06-05-2008, 09:30 PM

I have just been trying to figure out if the motor has been replaced in my T2. I already knew how to tell motors apart by the bolt on stuff, but didn't know about the block parts. Thanks for the great link Ted.

06-04-2008, 08:06 PM	#1
Rotary_Rocket_87 2nd Generation Freak Join Date: Mar 2008 Location: Chuck Vegas, NH iTrader: (0) Posts: 64 Rep Power: 17	motor differences I have been searching for a while on this one. Every thread that I have read that mentions the differences of S4 and S5 engines only state that the intakes are different and if it has EGR it is S4. The only thing I have found to help determine which series a shortblock is that the spark plugs aren't located the same on S4 and S5 rotor housings. Mazda moved them on the S5, but I can't find an info on how they moved them (measurements). Does anyone have anything else? __________________ '87 TII- full emissions removal, a/c removed, FPD removed, dual 12" e-fans, Rotary Performance FCD, ACT unsprung 6 puck w/ Xtreme PP, custom open 2.5 inch exhaust, custom clutch pivot ball, K&N cone filter, TB mod, RB downpipe, motor blown 8/7/09 '94 Mazda B4000- POS beater truck, stock "The easiest way to fail is to never try." - Me

06-04-2008, 09:03 PM	#2
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY iTrader: (0) Posts: 302 Rep Power: 17	Coolant temp sensor is different, has a bannana plug on S4 and spade on S5, also there is an indentation in the front cover for the S5 waterpump. The clutch fan has more blades on the S5, I think 8 S4 10 S5. If the injectors are on it, S4 has square top injectors, with EV-1 connectors, S5 has more of a rounded shape to the connector. __________________ My car blows up everytime I start it, it's rotary

06-05-2008, 06:48 AM	#4
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC iTrader: (0) Posts: 552 Rep Power: 17	Nice link. Rotary Rocket did mention a "short block" N/A or Turbo though? __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.

06-05-2008, 09:30 PM	#5
Rotary_Rocket_87 2nd Generation Freak Join Date: Mar 2008 Location: Chuck Vegas, NH iTrader: (0) Posts: 64 Rep Power: 17	I have just been trying to figure out if the motor has been replaced in my T2. I already knew how to tell motors apart by the bolt on stuff, but didn't know about the block parts. Thanks for the great link Ted. __________________ '87 TII- full emissions removal, a/c removed, FPD removed, dual 12" e-fans, Rotary Performance FCD, ACT unsprung 6 puck w/ Xtreme PP, custom open 2.5 inch exhaust, custom clutch pivot ball, K&N cone filter, TB mod, RB downpipe, motor blown 8/7/09 '94 Mazda B4000- POS beater truck, stock "The easiest way to fail is to never try." - Me