Ok the prototype car im making parts on has this loud ticking. It did not sound as loud before and now it sounds louder!
I know this is a high PSI car but i have not taken it apart to locate the injectors etc.
What I have found though is what looks like a very large solenoid which is bolted to the aft side of the head on the left. I put my finger on it and sure enough I feel the ticking being generated inside this unit. Does anyone know what this unit actualy is? Is it the injector pump or a solenoid which allows the high fuel pressure to make its way to the injector?
Ok the prototype car im making parts on has this loud ticking. It did not sound as loud before and now it sounds louder!
I know this is a high PSI car but i have not taken it apart to locate the injectors etc.
What I have found though is what looks like a very large solenoid which is bolted to the aft side of the head on the left. I put my finger on it and sure enough I feel the ticking being generated inside this unit. Does anyone know what this unit actualy is? Is it the injector pump or a solenoid which allows the high fuel pressure to make its way to the injector?
Where is the injector?
Thx.
Hector
You probably should do some research on SIDI engines (spark ignition direct inject). The injectors are in the head injecting directly into the combustion chamber. It's a different tuners game than whats been around for the last 20 or so years...
I think the fuel pressures are in the 1600psi (or something like that). A pin hole leak could have a jet of fuel coming out that could easily cut through your skin.
Oh, there is a fuel pump in the gas tank (just like a regular engine) and then a 'REAL' fuel pump driven off the engine that gives you the REAL pressures...
You probably should do some research on SIDI engines (spark ignition direct inject). The injectors are in the head injecting directly into the combustion chamber. It's a different tuners game than whats been around for the last 20 or so years...
I think the fuel pressures are in the 1600psi (or something like that). A pin hole leak could have a jet of fuel coming out that could easily cut through your skin.
Oh, there is a fuel pump in the gas tank (just like a regular engine) and then a 'REAL' fuel pump driven off the engine that gives you the REAL pressures...
Thanks for the info. So the fuel pump in the tank is then what you would call a "boost pump." The one on the head is the main pump.
I work on delta aircrafts too so im use to 3000psi hydraulic systems and that can cut you up pretty bad! When ther eis a pinhole leak though, the pressure is so high that it just mists as it comes out which is good.
the best route for this engine is just to make another fuel system for it indipendent of the factory setup. I would use the OEM pump and just run additional injectors to the intercooler piping. Thats been done for years by greddy and HKS.
Location: Rosamond, CA - Home of Willow Springs Raceway
Quote:
I think the fuel pressures are in the 1600psi (or something like that). A pin hole leak could have a jet of fuel coming out that could easily cut through your skin.
Someone mentioned it varys between 700 and 2000 psi. It's also a returnless fuel system.
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Ok the prototype car im making parts on has this loud ticking. It did not sound as loud before and now it sounds louder!
I know this is a high PSI car but i have not taken it apart to locate the injectors etc.
What I have found though is what looks like a very large solenoid which is bolted to the aft side of the head on the left. I put my finger on it and sure enough I feel the ticking being generated inside this unit. Does anyone know what this unit actualy is? Is it the injector pump or a solenoid which allows the high fuel pressure to make its way to the injector?
Where is the injector?
Thx.
Hector
Not having taken one of these apart, I would bet that part is a back pressure regulator, it is dumping excess pressure from the rail. There was talk that the ticking noise was the regulator relieving the fuel rail. I guess I need to look at my car with the covers off. The engine has 4 injectors on a common fuel rail. The system runs relatively high pressure, some have stated ~ 1000 PSI. The reason I say relatively high, is because my truck runs 22,000 PSI on the rail.
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Other things to keep in mind as you tinker with the system, there are many one time use seals, o-rings, gaskets, fuel lines, and attaching bolts and some specific service requiements for disassembly and reassembly. Check into it.
GM calls the in-tank fuel pump a "lift pump" and the engine mounted one, the High Pressure Fuel Pump.
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Last edited by Small Dealer : 03-09-2007 at 08:45 AM.
Location: Under an invisibility cloak, somewhere in the Northeast
Quote:
Originally Posted by Exhaust Depot
I am yet to find the injectors with a normal type rail. I have not fully gone crazy looking for it though. Took off the top cover, thats about it.
The fule rail is probably hidden under the intake manifold and the fuel injector insulator (block of foam in the thumbnail).
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INFORMATION POSTED ON SITE
Any GM Solstice Service Manual and Service Bulletin information found here on site, or Sales and Product information should be thought of as correct and accurate as of the date posted. After that any information or procedure should be confirmed as still correct with your dealership.
Look at http://www.autofieldguide.com/articl...0307wip05.html
This link to Automotive Design and Production magazine will take you to a slick on like version of a trade mag that I get hardcopy. Look at "Current Issue" under "Notable" at the article, "GM Quiets Direct Injection". I explains how GM has attempted to quiet the tick inherent in high-pressure, direct injection engines for their new 3.6 liter V6 for the 2008 Caddy CTS. It says the new injectors are housed in an isolation cuff made of stainless steel whick absorbs the energy created by the pulsing of the injectors.
It's not the pump and it's not the regulator. It's the injectors and the head is probably resonating (ringing), amplifying the tick. No mention of the Solstice Ecotec.
No, the pump is also making a clicking nose because when you place your finger on the pump housing, you can feel the sound and its at the same freqency of the sound.
Yeah, you're right. When the engine's idling the tick sounds like it's slower than the firing rate, while above idle, it sounds more like it's running at the firing rate. The idle rate is also different when it's cold than when it's hot, so the pump or regulator must be contributing to the sound.
