Starting LS7 engine
Starting LS7 engine We cranked our LS7 around with the starter to build oil pressure and check the connections last night. It did not seem to build any oil pressure. We are trouble shooting the gauge tonight. It was a beast to crank - it took a jump from a car to get it to really crank.
1) Are these 11:1 engines tough to crank?
2) Should I be priming the engine or let it pull oil from the tank until it build pressure?
1) Are these 11:1 engines tough to crank?
2) Should I be priming the engine or let it pull oil from the tank until it build pressure?
Originally Posted by pcf_mark
We cranked our LS7 around with the starter to build oil pressure and check the connections last night. It did not seem to build any oil pressure. We are trouble shooting the gauge tonight. It was a beast to crank - it took a jump from a car to get it to really crank.
1) Are these 11:1 engines tough to crank?
2) Should I be priming the engine or let it pull oil from the tank until it build pressure?
1) Are these 11:1 engines tough to crank?
2) Should I be priming the engine or let it pull oil from the tank until it build pressure?
We had an engine in the car that was previously on the dyno so it had been ran before. In the car it took a loooong time before it started building pressure, but it did.
I beleive I do but to be sure...
The oil from the tank (tank bottom fitting) is going to the rear port on the pan closest to the transmission.
The return line (top tank fitting) is going to the front fitting.
What oil pressure should I expect with 5W30 Mobile 1?
The oil from the tank (tank bottom fitting) is going to the rear port on the pan closest to the transmission.
The return line (top tank fitting) is going to the front fitting.
What oil pressure should I expect with 5W30 Mobile 1?
The oil from the tank (tank bottom fitting) is going to the rear port on the pan closest to the transmission.
The return line (top tank fitting) is going to the front fitting.
The return line (top tank fitting) is going to the front fitting.
What oil pressure should I expect with 5W30 Mobile 1?
Thanks for the confirmation. Using a new battery and good connection I had it cranking over nicely with 40 lbs on the oil pressure gauge. When setting the fuel pressure statically (not running) the first time where did you put it to get it to run? I have 35 lbs of fuel pressure now but I want 60 at idle running the same as OE but I do not want to have 10 things to look at and set when I start this up the first time!
When setting the fuel pressure statically (not running) the first time where did you put it to get it to run?
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Not a dumb question. We are istalling this engine in a '66 Corvette so we had to build the fuel side from scratch. All factory EFI systems are non adjustable. You can install an aftermarket pressure regulator to allow you to raise or lower the fuel pressure. This changes the whole fuel curve richer or leaner because the change in pressure impacts the flow rate. This was a popular mod in the 90's before you could flash tune your ECM. Now that you can change the fuel curve where you need it adjusting the fuel pressure is no longer used very much. We need to set our pressure to the same pressure as the factory so the tune will work correctly when it starts. Trick is the engine should be running to set the pressure but you need pressure to get it running.
