top feed fuel rail

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

I have been serching and i found something that make me think about getting a top feed fuel rail, but i was wondering about if i got a top feed fuel rail could i use DSM 440cc injectors? ThanksWes

Post by **WDRacing** » Mon Oct 13, 2003 2:22 am

Hmm, I don't see why not. Assuming you have somthing to manage them.

WD

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

ok thanks WDRacing

Post by **andrave** » Mon Oct 13, 2003 2:22 am

you can always go with the stock rail and RX-7 injectors... 550cc primarys or 850cc secondary's, only rib is that you have to get two engines worth since there is only one pair of each on each engine.

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

yeah im not sure if its true or not but i was reading on how some of the cylinder can get leand out or something like that?IM not sure about this? please put INFO on what u all thinkthanksWes

Post by **andrave** » Mon Oct 13, 2003 2:22 am

not sure exactly what you are talking about...if you are running nitrous that is injected into the intake, more of the nitrous tends to be sucked into the #1 cylinder (usually, depends on make) and it will run lean....or on some engines (EJ20, I think, thats the WRX engine, right?) the fuel rail is designed poorly so that real big injectors will cause the last injector on the rail to run leaner than the rest, and that cyl will kerplop. least its possible.I think the 240 fuel rail's potential hasn't ever been maxed out though, so no worries there.

Post by **Projex240** » Mon Oct 13, 2003 2:22 am

the rail is a 6an on the 240. This is the same size as the 300zx tt fuel rail. Since that fuel rail can support over 600 hp, i dont see a problem with the rail EVER being maxed out

Post by **I am Technoman** » Mon Oct 13, 2003 2:22 am

I have head of some people saying that the KA fuel rail could be maxed out but I say BS!

Post by **SingleCamSam** » Mon Oct 13, 2003 2:22 am

You could adapt a KA24E top-feed rail to your application.

Post by **andrave** » Mon Oct 13, 2003 2:22 am

yeah but is the spacing the same? they looked a little different.

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

ok, thanks guys im understading it alot better now.

Post by **mrniceguy** » Mon Oct 13, 2003 2:22 am

buddy of mine from another board has a fuel rail from some ford, think maybe a cobra or something its all billit and pretty save for the oval logo

Post by **andrave** » Mon Oct 13, 2003 2:22 am

I think it would be pretty easy to fab up a fuel rail, I'd think any machine shop could do it if you gave them the bore spaceings and the fittings you needed.

Post by **WDRacing** » Mon Oct 13, 2003 2:22 am

You could probably starve the fuel rail if you were running 100lb injectors, but I don't see anyone around here even close to that yet. In which case you have already switched to a topfeed anyway. So this post was basically a waste of your time for you to read.

WD

Post by **d240t2** » Mon Oct 13, 2003 2:22 am

If you get a top feed fuel rail intended for domestic top-feed injectors (like MSD's, etc.), you need to check and make sure that the injectors are the same physical size - that the injectors will fit in the rail and won't leak. I don't think they are.

Also, a SOHC rail won't work - the spacing is wrong and the injectors are smaller physically than MSDs.

Finally, the stock rail has supported 500whp...even at that level, it is more economical to build a new rail and get domestic injectors than to get injectors that'll fit the stock rail in that size. Even at the ~50lb injector level (with MSD 50lb/hr injectors +rail competing with drop-in 550cc/min injectors), it is a toss-up which is cheaper.

Dennis

Post by **andrave** » Mon Oct 13, 2003 2:22 am

nah, 850cc injectors are cheap as hell. why not use them?

Post by **DriFt3r** » Mon Oct 13, 2003 2:22 am

would I need a new fuel rail if I was to use the 72/hr injectors or can I modify the stock one?

Post by **s13conv** » Mon Oct 13, 2003 2:22 am

So DSM Injectors will fit in the KA24E fuel rail?

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

hey andrave where could i get some 850cc injectors for cheapand how much, and i was just wondering about the top feed fuel rail cuz ihave found top feed injectors for cheap and i furgured it would be a little cheaper to go that way, but it seems that everybody everybody dose not like top feed, so i guess i will stay with the side feed rail......thankswes

Post by **andrave** » Mon Oct 13, 2003 2:22 am

I thought a lot of the guys here were running MSD top feed low impedance...guess they aren't around.

Anyway 850's came stock as the secondary's in twin turbo RX-7's, and there are 2 per motor. So if you can find some guys on an RX-7 board that upgrade, you might be able to get theirs. Or you can order "remanufactured" ones for about 100-125 each. Which is fairly reasonable considering that aftermarket side feed high impedance (sr20) injectors will run around 400-500 bucks for 550cc's. I found a set for around 160 bucks from a guy that had parted out a few rotaries.

So that was 40 bucks each for 850's...not a bad deal.:-)

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

do u think u could send me an E-amil or something about that bored u foungd?thankswes

Post by **andrave** » Mon Oct 13, 2003 2:22 am

I got my from the united kingdom. Whatever, they were cheap.

Post by **Project DC2** » Mon Oct 13, 2003 2:22 am

ok so are stock Ka24DE motors top feed or sidefeed ?? im gettin mixed answers here .. sorry im just a honda guy tryin to learn mnore about 240's to better understand a future project i have in mind.

oh and if you guys are lookin for top feed injectors contact camp1320.com

210- shipped for 440CC injectors lucas style. ( they're RC blanks)

High Impendence / SaturatedLucas 310cc $195shippedLucas 440cc $200shippedRodchester 550cc $260shipped optimized spray pattern Siemen Deka 580cc $265shipped

Low Impendance / Peak and HoldSiemen Deka 740cc $275shippedSiemen Deka 850cc $280shippedRodchester 1000cc $295shipped optimized spray pattern Bosh 1600cc $250shipped

Post by **huguetpj** » Mon Oct 13, 2003 2:22 am

andrave: Just want to get this straight, you are using/gonna use RX7 850cc injectors with the DE fuel rail? Any mods necessary? Same impedances?

Post by **midnightsliding** » Mon Oct 13, 2003 2:22 am

IM not sure either im just trying to learn more about itWes

Post by **andrave** » Mon Oct 13, 2003 2:22 am

yeah I know guys that have used them on sr20's in UK with no problem, they ideally require these little "spacers" but the 850's pretty much bolt in. The 550's require sanding. the info is all online, here is a link to one page about it, you can find much more info if you search.

http://www.nissansilvia.co.nz/...s.htm

Post by **huguetpj** » Mon Oct 13, 2003 2:22 am

Thanks I'll look into it. The page has some very good info.

top feed fuel rail

top feed fuel rail

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