NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   Fuel Delivery (https://www.nopistons.com/3rd-generation-specific-18/fuel-delivery-42105/)

moyam01 12-22-2004 11:03 PM

Very stupid question, but I have to ask, what is the fuel delivery system on a FD? I'm thinking mechanical fuel injection but not sure. Thank you for your patience (very stupid question.)

moyam01 12-23-2004 08:43 PM

Anybody? I know someone has the awnser to this question.

GreyGT-C 12-23-2004 08:47 PM

electronic FI

P'cola FD 12-23-2004 09:21 PM

Electronic fuel injection

Staged injection

Side feed injectors

550cc primary injectors

850cc secondary injectors

Fuel pump->fuel filter->fuel pulsation->primary rail->secondary rail->fuel pressure regulator->gas tank

DUB 12-23-2004 09:29 PM

^nice!

moyam01 12-25-2004 03:31 PM

Well, are the injectors the same with piston engines (timed how long to be open for), because I thought that rotary engines needed a constant flow of fuel and air. Am I right? So I'm basiclly asking do thy stay open all the time?

GreyGT-C 12-25-2004 03:44 PM

same as a standard piston engine injector.

casus_belli 12-26-2004 08:14 AM

Here's a good description of the RX7 Fuel System

moyam01 12-26-2004 12:03 PM

Oh. Cool. So it uses only the map sensor to get it's fuel readings. Is this right or does it have a maf sensor too?

casus_belli 12-26-2004 12:17 PM


Originally Posted by moyam01' date='Dec 26 2004, 02:03 PM
Oh. Cool. So it uses only the map sensor to get it's fuel readings. Is this right or does it have a maf sensor too?




No - it uses any number of sensors (air temp, engine temp, atmospheric pressure, O2. etc) to dermine which fuel "MAP" (a graph) to use. The MAP "sensor" tells it Manifold & Atmospheric Pressure.


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