2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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stock injector sizes

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Old 10-27-02, 08:02 PM
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stock injector sizes

could some one tell me what size injectors 2nd gen use?
n/a and turbo models. If I read the injectors right they are 330cc for the n/a's. I think the turbo's are 550's???
thanks guys,
albert
Old 10-28-02, 04:04 AM
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For all 86-91 RX-7's:

NA: 4 x 460cc/min
Turbo: 4 x 550cc/min
Old 10-28-02, 06:46 AM
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There are two componensts of an injector flow rating:
1) The flow rate
2) The fuel pressure at which this rate occurs

Stock injectors:
NA: 444cc/min @ 34.1psi, 472cc/min @ 39.8psi
TII: 532cc/min @ 34.1psi, 458cc/min @ 39.8psi

If you average these, you will get the slang flow rate given in the previous post. Obviously, lower fuel pressure will yield a lower flow rate, and higher fuel pressure will yield a higher flow rate. Not all fuel injectors are rated at the same pressure, so be sure to do your math.
http://www.rceng.com/technical.htm
Old 10-31-02, 09:34 AM
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This is some good information but I think I see a typo.


NA: 444cc/min @ 34.1psi, 472cc/min @ 39.8psi

TII: 532cc/min @ 34.1psi, 458cc/min @ 39.8psi

Why would the TII have 458cc/min at 40psi?? I think that should be 558cc. Typo.
Old 10-31-02, 02:05 PM
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yeap typo...
Old 10-31-02, 06:02 PM
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Originally posted by SaabGuy
This is some good information but I think I see a typo.
Why would the TII have 458cc/min at 40psi?? I think that should be 558cc. Typo.
Actually it should be 568cc/min. Sorry about that. All of this info is in the Factory Service Manual, which has less typos.

Also, (532cc + 568cc) / 2 = 550cc, which is the average flow rate normally assiciated with the TII injectors.
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