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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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06-04-2008, 08:06 PM
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#1 |
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2nd Generation Freak
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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?
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'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 |
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06-04-2008, 09:03 PM
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Rotary Fanatic
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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.
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My car blows up everytime I start it, it's rotary  
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06-04-2008, 10:31 PM
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RCC Addict
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reted_2000@yahoo.com Technical Advisor FC3S Pro http://fc3spro.com/ Quote:
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06-05-2008, 06:48 AM
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Home-brew Rotary
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Nice link.
Rotary Rocket did mention a "short block" N/A or Turbo though?
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'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. |
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06-05-2008, 09:30 PM
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2nd Generation Freak
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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.
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'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 |
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Hybrid Mode
