Late Model Air Intake
09-11-04, 01:26 PM
#1
Rotary Freak
Thread Starter
Late Model Air Intake
According to the Robinette site, the air intake path is a problem in our cars...
The third-generation RX-7 had come off Mazda's rigorous development test programs on the bench and on the demanding Global Road Circuit section of the Miyoshi Proving Ground with flying colors. Yet, there was one arduous test left undone. When the car was taken to a race track near Tokyo known for its tight turns requiring short bursts of speed followed by fierce deceleration, the pride of Mazda's rotary rocket team quickly cooked its powerplant when pushed to the limit. Subsequent investigation revealed that air temperature at the entry area had risen as high as 50 C (122 F). Fresh air for the engine's consumption was taken from the single intake that also fed to the air-to-air intercooler. On wide-open driving, air flow reversed its course from the intercooler and went straight into the engine's intake. The intercooler was acting as an inter-heater! In the updated RX-7 with a designed fascia, fresh air is taken through a separate, dedicated duct guided by a newly installed air-guide. Air temperature at the engine's intake entry area has been halved to about 25 C ( 77 F), which adds about 7 kW (10bhp) to the output.
Has anyone obtained and tested a later model intake system?
The third-generation RX-7 had come off Mazda's rigorous development test programs on the bench and on the demanding Global Road Circuit section of the Miyoshi Proving Ground with flying colors. Yet, there was one arduous test left undone. When the car was taken to a race track near Tokyo known for its tight turns requiring short bursts of speed followed by fierce deceleration, the pride of Mazda's rotary rocket team quickly cooked its powerplant when pushed to the limit. Subsequent investigation revealed that air temperature at the entry area had risen as high as 50 C (122 F). Fresh air for the engine's consumption was taken from the single intake that also fed to the air-to-air intercooler. On wide-open driving, air flow reversed its course from the intercooler and went straight into the engine's intake. The intercooler was acting as an inter-heater! In the updated RX-7 with a designed fascia, fresh air is taken through a separate, dedicated duct guided by a newly installed air-guide. Air temperature at the engine's intake entry area has been halved to about 25 C ( 77 F), which adds about 7 kW (10bhp) to the output.
Has anyone obtained and tested a later model intake system?
09-12-04, 01:05 AM
#3
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Wouldnt the difference be in the front bumer? the larger openings, and using the pass. side (if it didnt have dual oil coolers) opening for cooler air?
I dont see how you can change the intake (box) to get cooler air, as nothing else in the engine bay changed. You just need to duct it better.
I dont see how you can change the intake (box) to get cooler air, as nothing else in the engine bay changed. You just need to duct it better.
09-12-04, 01:53 AM
#4
Rotary Freak
Thread Starter
Originally Posted by ijneb
Wouldnt the difference be in the front bumer? the larger openings, and using the pass. side (if it didnt have dual oil coolers) opening for cooler air?
I dont see how you can change the intake (box) to get cooler air, as nothing else in the engine bay changed. You just need to duct it better.
I dont see how you can change the intake (box) to get cooler air, as nothing else in the engine bay changed. You just need to duct it better.
In the updated RX-7 with a designed fascia, fresh air is taken through a separate, dedicated duct guided by a newly installed air-guide
Last edited by BLKTOPTRVL; 09-12-04 at 01:55 AM.
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