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RX-7 680cc injectors

belize1334

Well-known member
Joined
Nov 18, 2003
Messages
3,316
Location
Bozeman, MT
I'm thinking about picking up a set since they're Denso (ND 195500-0900) and can be had from Rock-Auto for $36 each which seems like a good price for ~700cc injectors. These aren't the normal Denso 660 or 720s so there doesn't seem to be much documentation on them. Does anybody have information about them in terms of pintle design, spray pattern, dwell time etc?

Here's a link the the rock-auto page and here's another somewhat useful link.
 

frank1

Well-known member
Joined
Jul 17, 2008
Messages
68
Location
anaheim
find a way to flow test them
 

I've had some customers try the "680cc" RX-7 injectors from some other auto parts places, and they are terrible. The guys are taking some smaller Denso injectors, and drilling them out, from what Rich at CruzinPerformance told me after flowing them for us. They totally ruined the spray pattern, and the flowrates were all over the place, not close enough to safely run in the same engine.
You have to remember that in an RX-7 these are used only as secondary injectors, so I guess the pattern and flowrate isn't quite as critical as in our application. There are much better deals to be had, IMO. If you want big, and want to go really cheap, I believe there was a guy on eBay out of Miami selling the Siemens 720/750cc injectors like I used to run in #1886 for ~$130 a set, NEW!
 

belize1334

Well-known member
Joined
Nov 18, 2003
Messages
3,316
Location
Bozeman, MT
I just liked the idea of an OEM reman part that could be purchased cheap. You're right though, that if they're secondaries they may not be as carefully configured. I think that the used ebay Evo injectors I have are misbehaving so I was looking at alternatives and I came upon those from RockAuto for the same price as remanned Evo injectors and I thought I'd get an opinion on them...and I have. Thanks for the input.
 
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