fatbillybob

This LS oil priming tool is for cheap and lazy people who don't prime motors very often. There are some very fancy primers out there for $100's and there are home made PVC cans for under $30. This costs like $10 and in my case I had all the stuff in my garage and it took 10 mins. So I built this and only apply 10psi to 15psi or so and could see the oil priming the motor into the oil pressure sensor hole and into the camshaft in the valley so I know it works on low pressure. A standard oil jug can take the pressure or you can put the jug into a 5 gallon bucket and stuff it with towels and prevent the jug from stretching from the air pressure.

On version 2 all I would do is need the aquarium tubing, the fitting to the block, and oil jug. I would just pierce a small hole where the pictured air inlet valve is and just use my airgun to pressurize the jug and force the oil into the motor. That would be even faster, cheaper and less parts. I have tried this twice now and it works perfectly.

froggy47

Does this eventually "overfill" the oil?



I love diy solutions.

fatbillybob

Well yes there is a limit you want to top of dipstick line. So just pump in a couple QTs then top off via the oil filler cap as needed around 6.5 to7.5 qt depending on how you roll.

The melling tool is $260 bucks! Great if you do this for a business expensive and unnecessary for the occasional motor rebuild your or I would do.


https://jet.com/product/detail/df087...a:2&code=PLA15

froggy47

Got it, I was thinking this was every cold start to save cold start wear/tear.

fatbillybob

Nope it is for the 1st start up of a new motor.

For the day to day racing...
I run a giant oil cooler for racing so the oil drains into the sump and I get a low oil pressure start after the car has sat for 1+ days. The C5 is very smart however. All I do is prime the system before I start it after 1+ day of sitting by pressing down clutch and gas pedal to the floor and crank for 5 seconds. The engine will crank but not fire. Then I start car normally and the oil pressure is already there. No dry starts!

phipp85

Good idea! Thanks for the tip. Where did you buy the extra fitting for the block?

froggy47

Would this work on my stock 2004 c5z? Never heard of it.

fatbillybob

The fitting is a common size. I never measured it. It is so common I had it laying around my garage in a box of fittings.

Yes froggy try it. My c5z is a 2004 too. If you run stock oiling system you don't need to do it. If you run an aftermarket oil cooler like many racers you might.

aaronc7

Yes, over 80% TPS will shut off the injectors during cranking. In the software they call it a "flood clear" feature.

Dan H.

This is great to know, I was pulling the fuel pump fuse when my car sits for more than a day to build some oil pressure. I have a DRM standalone cooler.

Nowanker

Sweet no cost solution!
FWIW a 2liter soda bottle will take ~100psi...

froggy47

I just want to try it for fun, mine is stock.

Thanks, cool trivia.

ZedO6

Was doing this as well...I know about the "flood clear" software written into many OEM programs but never tried it on our Corvettes. Thanks Carl

FASTFATBOY

I would never do this unless I was planning on starting the new engine within 10 minutes of doing it.

It pushes assembly lube off the crank, rods and cam bearings.

I never prime a new engine, thats what assembly lube is for. Fill the oil filter prior to cranking and the assembly lube will take care of it the 1.5 seconds for the pump to pick up.

The above is for new engines.

fatbillybob

Assembly lube covers very few moving parts. It is great for a dry start. It is so easy to prime and pressurize an LS motor with so minimal cost there is no reason not to do it. The engine lives on
Oil. All you are doing by pressurizing it is giving the motor what it needs to live. Melling and others make pressurizing tools for exactly this reason.

zrtman1

Simple effective idea. There is a lot of volume to fill on a new engine. Oil pressure hits within a few seconds but - mine took a minute at 45 psi before all the air was out of the system and all pushrods/rockers had oil coming out of them.

These are also good to initial fill a new oil cooler setup.

Joshboody

Mine does NOT do this... just starts right up. I checked the tune and everything looks good. Any thoughts?

aaronc7

What year/model?? I just got my car back from a long rebuild, so I haven't done it in a while... I'll confirm sometime.

Joshboody

I have 2001 coupe. Tune looks correct though, so kinda weird.

aaronc7

2003 Z06 here. Just tried it works as advertised. Maybe a minor OS difference.