924Board.org

[CorsePerVita]

Does anyone have any good references to rails and injectors that are a straight fit for our engines for megasquirt conversions?

I've seen a lot of different posts but some don't list the rails, or others are years old and don't have the pics and stuff anymore.

I bought a stock rail off of a zetec but the way the rail fits is "ok" but the actual hard line coming off of the rail didn't end up being what I was looking for.

I'd like an inline style (i'm doing an in line fuel pressure regulator) so basically I'll just have the one line going to the rail and that's it. The return line on my setup will go from the reg back to the tank.

I'd like something that I can just bolt up and be done with it, if anyone knows of any, that would rock.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

[fiat22turbo]

There isn't a bolt-on available. You have to make your own brackets. Ideola is working on a solution, but I don't think he's ready yet. The only other option that WAS available was from Endwrench, but he doesn't offer them anymore, but they come up for sale from time to time.

Your best bet is to buy a universal racing style rail for a Ford Zetec, etc which will be a straight piece of billet that you can use the proper fittings to adapt it to your needs.

Or wander the salvage yards with a ruler in hand measuring injector spacing and look for rails where the inlet/outlet match what you need and lend themselves to be adapted to the head.

Either way, hold down brackets will need to be fabricated to hold the rails in place.

fors example, here's a billet rail for a Focus:

http://www.rsaperformance.com/obx-fuel-rail-billet-00-04-ford-focus-zetec-zx3-zx4-zx5.html?12476



That should work, once you have some brackets fabb'd up.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[mikebola]

the info is somewhere in my notes somewhere, but if I remember correctly, the only rails that I found that fit were neon 2.0 (I think) and focus zetec engines (in the US, at least)
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proud owner of a 1979 924 Sebring Edition with a 931 trans that looks horrible but somehow runs...

[!tom]

[CorsePerVita]

[fiat22turbo]

Seems like there isn't a way to avoid heat transfer to the fuel/rail as it sits so close to the head.

Sitting on top of intake away from the exhaust helps, as does having the fuel lines on the driver's side.

Think of the number of production vehicles that implement the fuel system in this way.

I think you'll be fine the way you've planned it. Just find the rail that fits your needs and plumb it in.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[Raceboy]

The cars that use returnless fuel rail have usually plastic intake manifolds and better venting under the hood plus lower engine temps thanks to better efficiency.

I would never consider returnless fuel rail on 924 as it is far less reliable and heats fuel unnecessarily. Fuel is heated anyway by the pump which uses fuel as coolant but you don't want the fuel to be heated more.

For example, 996 Turbos (and newer) have fuel cooling circuit through aircon system which avoids fuel vapourization in the fuel system.

I've struggled with vapourization on 924 before on hot summer days at the track (around 10 years ago) and you wan't to do anything to avoid it.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[ideola]

[924RACR]

Regarding the heat issues... for the fuel, I've noticed our fuel tank itself gets pretty hot from the exhaust and trans on-track. Yes, the exhaust does go out the back of the car per the stock routing - though no neat shields still in there.

As for fuel rail - presumably the biggest issue to address would be conducted heat. Easy to wrap, but the mounts can still conduct heat. Aluminum mounts would thus be worst for this; plastic or similar less-conductive material would be nicer, but perhaps inadequately robust.

So, what metal (or similar material?) could we use for mounting with the lowest heat conductivity? I don't know that I'd feel comfortable testing some composite mounts - not sure I'm good enough to make those yet...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[CorsePerVita]

[CorsePerVita]

[ideola]

[CorsePerVita]

I guess I'll go ahead and order one then.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

[ideola]

Make sure you check their return policy.
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erstwhile owner of just about every 924 variant ever made

[WEASEL149]

While I had the chance, I measured my father's injector spacing on his Mercedes CLK230 Kompressor - 96mm between injector centres, so looks as though that would work.
Only one inlet on it though, so anyone using it would probably need to add a return fitting to it.
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1979 UK 932