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Old 07-01-2019, 07:49 PM
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Oil pressure

Have an older sbc. Changed oil pan last year. The pan was off for about four days, have'nt tried to start it yet..things in the way until now.The question being, if I pull the wire from distributor to the coil and pull the plugs ( no fire, no compression ) would it be fine to crank it over to get oil pressure? Also the dist is a Mallory Unilite. don't know if it would be harmful to it without the wire from the coil or the plugs not grounded. I guess this is two questions. I THINK I should be ok, but...help??

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Old 07-01-2019, 08:28 PM
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If you do unhook the coil to distributor sparkplug wire, make sure you disconnect it at the distributor end and place that end near or on a grounded surface, so the spark generated at the coil has a place to go.

Would be easier just to remove the power feed wire from the distributor, so the module and the ignition coil are not powered up.

Then spin engine over with sparkplugs out to pre-oil the engine.

don't leave any chance of a spark triggered by the module having no place to go to ground, because if it can't it could backfeed the Uni-Lite module and blow it out.
My experience with the Uni-Lite is that it is EXTREMELY sensitive to any voltage spikes and burns out at the slightest power surge, so take no chances with it is my best advice.
Disconnect the power feed wire from the ignition switch to the distributor.
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Old 07-02-2019, 09:48 AM
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Detail

Another small point - be sure the oil filter is full of oil.
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Old 07-02-2019, 01:10 PM
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The Unilite system must use a resistor to drop the supply (run) voltage from 12v to 9v or the infra red Unilite bulb will blow out. That means you must maintain the stock resistor or resistance wire in the start circuit in order to raise the supply (run) voltage from 9v to 12v when starting the engine. That will eventually blow out the infrared bulb.

I think you will agree that a 9v start is not enough for any engine with more than 8:1 compression ratio.

Last edited by MouseFink; 07-02-2019 at 01:17 PM.
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Old 07-02-2019, 01:34 PM
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Restoration Battery Co. makes ACDelco DC12 licensed duplicate car batteries. I purchased one of those batteries several years ago for the Pontiac 455 engine with 12.5:1 compression ratio (1964 GTO 389 heads) in my 1955 Chevrolet.

The ACDelco DC12 Restoration Battery would only start the big motor four or five times in secession, before the Battery was dead.

I called Restoration Battery and they told me that the old ACDelco DC12 lead acid batteries and their duplicates were not designed for engines with more than 12:1 compression ratio. Thus the part number “DC12”.
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Old 07-02-2019, 07:03 PM
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I have primed several engines by adding 1 or 2 quarts extra pouring one into each tappet cover and hand cranking it 4 revolutions with the plugs out.

Splash lubes the crank bearings and pouring it down each valve cover (helps) lube the rockers and cam.
If your valve covers are leaking you can pop them off and cover all your rockers with oil and get the oil down the drain holes to the cam ends. Throw your covers on with new seals and turn it by hand.

If it has been sitting I will throw a ounce in each cylinder of marvels mystery oil to get those rings wet before starting pouring any added oil in. A hose helps get it in and a rag over/under the plug hole catches what comes out.

Then just empty out the extra oil and use it your next oil change.
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Old 07-10-2019, 10:44 AM
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Thanks for the feedback. I have oil pressure. All seems o k!
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Old 07-10-2019, 11:10 AM
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I have engines and cars and trucks that sit for weeks and months and have no issues so I wouldn't worry so much.
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