# top feed injectors? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [May 12, 2006, 1:41pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869 "2006-05-12T13:41:46Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![spoolint78](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@spoolint78](https://forums.speedlife.net/u/spoolint78)\ **Post date:** [May 12, 2006, 1:41pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/1 "2006-05-12T13:41:46Z")
I understand the ka24 and sr20 run side feed injectors which can be relatively expensive to upgrade. Is there a company that makes top feed fuel rails for these motors? I have a friend who makes me rails for the supras, gonna try and see if he can do something for the 240 community, but i just want to know if its possible. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 12, 2006, 1:52pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/2 "2006-05-12T13:52:37Z")
MSD injectors are relatively cheap. Also RC Engineering to consider. As for rail, they can be had for a couple hundred $. Eg. [www.jgycustoms.com](http://www.jgycustoms.com) ---
**Author:** ![robbbby](https://avatars.discourse-cdn.com/v4/letter/r/b19c9b/32.png) [@robbbby](https://forums.speedlife.net/u/robbbby)\ **Post date:** [May 12, 2006, 3:33pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/3 "2006-05-12T15:33:23Z")
Both big name companies and custom shops make rails for these motors. There is alot to choose from. The top feed injectors you can use will depend on your rail though since top feed injectors vary in size. I used a sard fuel rail with precision turbo injectors, perfect fit. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [May 12, 2006, 4:09pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/4 "2006-05-12T16:09:05Z")
hey make some topfeed rails for cheap, ill take one ---
**Author:** ![spoolint78](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@spoolint78](https://forums.speedlife.net/u/spoolint78)\ **Post date:** [May 12, 2006, 11:49pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/5 "2006-05-12T23:49:46Z")
it can be done i mean its shorter then the mkiv or mk3 supra rails, so it will be relatively cheaper. I think i’m gonna get my hands on a intake mani or head with a rail and do the mock ups. Do the injectors sit in the manifold? or the head? ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [May 14, 2006, 7:46am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/6 "2006-05-14T07:46:59Z")
Mani. if you are nicec I may be able to lend you a Mani ---
**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\ **Post date:** [May 14, 2006, 7:52am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/7 "2006-05-14T07:52:08Z")
> [@Benson240sx](#): > > Mani. if you are nicec I may be able to lend you a Mani if he is nice, come-on benson, I’m watching this thinking depending on the price, I’m in… There has got to be someone with a spare SR fuel rail… I’ve got a spare KA24DE fuel rail (+1 injector) available for this, maybe help some KA-T guys out too… ---
**Author:** ![robbbby](https://avatars.discourse-cdn.com/v4/letter/r/b19c9b/32.png) [@robbbby](https://forums.speedlife.net/u/robbbby)\ **Post date:** [May 14, 2006, 7:59am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/8 "2006-05-14T07:59:44Z")
The only thing I can see that you would need to know is distance between injectors on the manifold so you can drill your holes on the rail accordingly. ---
**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\ **Post date:** [May 14, 2006, 8:16am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/9 "2006-05-14T08:16:55Z")
> [@robbbby](#): > > The only thing I can see that you would need to know is distance between injectors on the manifold so you can drill your holes on the rail accordingly. depth and diameter of the injectors ---
**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\ **Post date:** [May 14, 2006, 8:20am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/10 "2006-05-14T08:20:44Z")
Speaking of injectors does anyone know the conversion formula of lb/hr vs cc/min? ---
**Author:** ![robbbby](https://avatars.discourse-cdn.com/v4/letter/r/b19c9b/32.png) [@robbbby](https://forums.speedlife.net/u/robbbby)\ **Post date:** [May 14, 2006, 8:57am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/11 "2006-05-14T08:57:27Z")
> [@S13GG](#): > > [quote=robbbby]The only thing I can see that you would need to know is distance between injectors on the manifold so you can drill your holes on the rail accordingly. depth and diameter of the injectors[/quote] You still wouldn’t need a manifold for that. You would just have to drill that rail out to whatever size the top ring of the injector you plan on using is. I believe most top feeds come in three different sizes. Domestic (msd style), sport compact (rc’s etc) and I believe dsm/mitsubishi has a different size top feed. lb/hr -\> cc/min Multiply by 10.2 ---
**Author:** ![AppleSauce](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/applesauce/32/5521_2.png) [@AppleSauce](https://forums.speedlife.net/u/AppleSauce)\ **Post date:** [May 14, 2006, 11:53am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/12 "2006-05-14T11:53:40Z")
I looked at doing this ages ago, and it just wasn’t really worth doing. Picked up remaned injectors instead from Dave at [http://deatschwerks.com/](http://deatschwerks.com/) There are a lot of people on here running them, Dave is a really cool guy. ---
**Author:** ![Fobwall](https://avatars.discourse-cdn.com/v4/letter/f/7ea924/32.png) [@Fobwall](https://forums.speedlife.net/u/Fobwall)\ **Post date:** [May 14, 2006, 3:16pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/13 "2006-05-14T15:16:09Z")
> [@AppleSauce](#): > > I looked at doing this ages ago, and it just wasn’t really worth doing. Picked up remaned injectors instead from Dave at [http://deatschwerks.com/](http://deatschwerks.com/) > > There are a lot of people on here running them, Dave is a really cool guy. Everyone should follow what applesauce is doing. He has the fastest car on son. ---
**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\ **Post date:** [May 14, 2006, 6:18pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/14 "2006-05-14T18:18:24Z")
> [@birdhou53](#): > > [quote=AppleSauce]I looked at doing this ages ago, and it just wasn’t really worth doing. Picked up remaned injectors instead from Dave at [http://deatschwerks.com/](http://deatschwerks.com/) > > There are a lot of people on here running them, Dave is a really cool guy. Everyone should follow what applesauce is doing. He has the fastest car on son.[/quote] maybe if you actually researched injectors you would find that deatschwerks are some of the best injectors out there for the price? for the cost/hassle of doing top feed you can get deatschwerks for only a few dollars more, also most strut braces wont clear top feed rails. ---
**Author:** ![spoolint78](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@spoolint78](https://forums.speedlife.net/u/spoolint78)\ **Post date:** [May 14, 2006, 9:45pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/15 "2006-05-14T21:45:03Z")
pretty sure lbs to cc is x 10.5 i’m gonna get cracking on this for you guys ---
**Author:** ![twistedsteel](https://avatars.discourse-cdn.com/v4/letter/t/6f9a4e/32.png) [@twistedsteel](https://forums.speedlife.net/u/twistedsteel)\ **Post date:** [May 17, 2006, 9:29am UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/16 "2006-05-17T09:29:31Z")
I made a top feed fuel rail for a s12 CA18DET for a friend of mine I will put up some pics ---
**Author:** ![twistedsteel](https://avatars.discourse-cdn.com/v4/letter/t/6f9a4e/32.png) [@twistedsteel](https://forums.speedlife.net/u/twistedsteel)\ **Post date:** [May 21, 2006, 8:15pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/17 "2006-05-21T20:15:13Z")
here are some pics! the fuel rail’s are cnc machined to fit any application!!! [![http://img54.imageshack.us/img54/1686/nccrail15dg.jpg](http://img54.imageshack.us/img54/1686/nccrail15dg.jpg)](http://imageshack.us) [![http://img469.imageshack.us/img469/6738/nccrail29gu.jpg](http://img469.imageshack.us/img469/6738/nccrail29gu.jpg)](http://imageshack.us) [![http://img68.imageshack.us/img68/9728/nccrail30jv.jpg](http://img68.imageshack.us/img68/9728/nccrail30jv.jpg)](http://imageshack.us) PM me for details or any questions ---
**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\ **Post date:** [May 21, 2006, 8:18pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/18 "2006-05-21T20:18:48Z")
> [@twistedsteel](#): > > I made a top feed fuel rail for a s12 CA18DET for a friend of mine I will put up some pics retro fitted ca18det? those came ca18et ---
**Author:** ![twistedsteel](https://avatars.discourse-cdn.com/v4/letter/t/6f9a4e/32.png) [@twistedsteel](https://forums.speedlife.net/u/twistedsteel)\ **Post date:** [May 21, 2006, 8:22pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/19 "2006-05-21T20:22:14Z")
Its a 84 200sx turbo with an sr t25 i believe I made the rail to fit dsm turbo injectors! ---
**Author:** ![spd-dmn](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spd-dmn/32/5513_2.png) [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)\ **Post date:** [May 21, 2006, 9:09pm UTC](https://forums.speedlife.net/t/top-feed-injectors/95869/20 "2006-05-21T21:09:50Z")
whoaa tharr… twistedsteel you need to resize both your avatar and your sig. edit: _thanks_