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Topic Review (Newest First)
01-31-2013 12:28 PM
lg1969 That is normal when it's cold. When I crank the engine cold the riches to 80-85 psi, Once the oil is heated to the operating temperature it will read around 60 to 65 psi at 2000 RPM. 30 -35 psi at idle.
01-31-2013 05:25 AM
cobalt327
Quote:
Originally Posted by 69chevyLWB View Post
Cut filter open and found some very very fine metallic particles. Thinking that's pretty normal since its break in and new bearings and rings need to seat. Or should I be worried about it? Just some very fine metal particles. No chunks or anything noticeable like that.
I wouldn't worry. It would be abnormal to NOT see anything.
01-31-2013 05:14 AM
Richiehd
Quote:
Originally Posted by 69chevyLWB View Post
Cut filter open and found some very very fine metallic particles. Thinking that's pretty normal since its break in and new bearings and rings need to seat. Or should I be worried about it? Just some very fine metal particles. No chunks or anything noticeable like that.
Probably ok but for $25.00 you can have it analyzed. Contact Blackstone Laboratories.Fort Wayne IN. Google them, they will send you a kit, you send them oil sample and $25.00
01-30-2013 10:29 PM
vinniekq2 Probably ok, change the oil again in 500 miles if you are worried and check again
01-30-2013 10:22 PM
69chevyLWB Cut filter open and found some very very fine metallic particles. Thinking that's pretty normal since its break in and new bearings and rings need to seat. Or should I be worried about it? Just some very fine metal particles. No chunks or anything noticeable like that.
01-30-2013 07:09 PM
painted jester
Quote:
Originally Posted by 69chevyLWB View Post
Alrighty! got her all broke in and oil pressure was about 45-50 lbs at 2500 rpm when up to temp. 850 rpm idle oil psi was around 25 or so dont exactly remember. drained the oil and everything looks good so far! just need to cut open the filter and look at that. My first engine build woohoo!
Great news

Jester
01-30-2013 06:22 PM
69chevyLWB Alrighty! got her all broke in and oil pressure was about 45-50 lbs at 2500 rpm when up to temp. 850 rpm idle oil psi was around 25 or so dont exactly remember. drained the oil and everything looks good so far! just need to cut open the filter and look at that. My first engine build woohoo!
01-29-2013 05:08 PM
oldbogie
Quote:
Originally Posted by 71nova355 View Post
Hi, Hey I thought the bypass was only meant to happen cold untill the oil was warmmed up so it wouldnt have such a hard time trying to go through the filter? Are you guys talking about somthing else? not starting anything but id like to know.
Two different bypasses in different places for different reasons:

The bypass on the pump establishes maximum operating pressure. The bypass at the filter shunts oil around the filter if the flow through the filter isn't fast enough. In that case there is a back pressure which opens the bypass to allow unfiltered oil to proceed into the engine this does not affect operating pressure unless both the filter media and the relief valve fail.

The pump is really a relief valve, however, the stock designed oil pump rather than venting the excess oil back to the pan circulates (bypasses) it back to the inlet side of the pump. The down side of this is the oil gets hot (although that helps heat the cold oil). The up side is the factory doesn't have to design a system to absorb the energy from the oil to prevent splash when it would have returned to the sump. However, racers that run wet sumps (by rule) close the return route and open a vent to the pan while using a heavy perforated metal screen to absorb the energy from the oil and direct it into the sump without splash nor entraining it into the crankshaft assembly.

The filter bypass is a tougher deal if you need to be sure that only filtered oil flows into the engine. This requires more filter media area which leads to GM heavy duty truck filters that are about twice the length of the standard filter and suck up ground clearance. There are kits to mount these horizontally if the installation has the space. There are remote filters that require external plumbing to and from the engine, these often use two filters usually the large Ford spin on type. There's also a host of specialty screens that are designed to catch the larger chunks of broken parts.

To a large extent both relief/bypass valves are very sensitive to pressure that results from oil viscosity, so when the oil is cold these valves are almost always open. It actually takes some time for engine oil to warm up this is long after the coolant temp says the engine is warm; without some form of heat exchange this in cold weather is easily 3 to 4 times the distance it takes to indicate that the coolant is normalized. So if you rip on the throttle in this period you’re for sure pumping a lot of unfiltered oil into the engine. Many years ago the OEMs started running engine oil through a heat exchanger either within the radiator, as auto trans fluid does, or with an external unit like the Ford's cop cars. The point was severalfold in that this gets the engine fully warmed a lot faster which improves oil filtration, reduces sludge formation, reduces wear of rubbing parts, improves fuel mileage and greatly reduces emissions. It really turns out, that contrary to hot rodders dogma, the bigger problem with engine oil is getting it hot enough rather than needing to cool it. Cooling is a problem for very heavy duty applications and distance racing, for ordinary street functions not so much.

Bogie
01-29-2013 04:26 PM
71nova355 lol just soaking up the knowledge bud.
01-29-2013 02:41 PM
painted jester Your scores even 1 thanked and 1 thanks LOL

Jester
01-29-2013 02:19 PM
71nova355
Quote:
Originally Posted by cobalt327 View Post
There may be two bypass valves: One may be located in the filter, one may be located in the filter mount. Then there's the pressure relief spring and valve in the pump.

The pressure relief spring and valve in the pump is what sets the oil system pressure, unless the oil viscosity/oil clearances combine to raise the oil pressure beyond the pressure relief of the pump. This assumes a correctly working oil pump pressure relief assembly.

It wouldn't be a big surprise to find the pump has a different relief spring than it was supposed to have, or even that the pump valve is hanging closed. But see what you get for pressure w/the thinner viscosity oil after break in before you drop the pan.
Thanks, that sounds about right. Thank you too jester.
01-29-2013 05:11 AM
cobalt327
Quote:
Originally Posted by 71nova355 View Post
Hi, Hey I thought the bypass was only meant to happen cold untill the oil was warmmed up so it wouldnt have such a hard time trying to go through the filter? Are you guys talking about somthing else? not starting anything but id like to know.
There may be two bypass valves: One may be located in the filter, one may be located in the filter mount. Then there's the pressure relief spring and valve in the pump.

The pressure relief spring and valve in the pump is what sets the oil system pressure, unless the oil viscosity/oil clearances combine to raise the oil pressure beyond the pressure relief of the pump. This assumes a correctly working oil pump pressure relief assembly.

It wouldn't be a big surprise to find the pump has a different relief spring than it was supposed to have, or even that the pump valve is hanging closed. But see what you get for pressure w/the thinner viscosity oil after break in before you drop the pan.
01-28-2013 10:23 PM
69chevyLWB I am currently using Lucas oil break-in oil and for the next change it will be brad penn 10w-30
01-28-2013 10:20 PM
vinniekq2 Dual remote parallel filters might be an answer before removing the pan.
01-28-2013 10:00 PM
painted jester
Quote:
Originally Posted by 71nova355 View Post
Hi, Hey I thought the bypass was only meant to happen cold untill the oil was warmmed up so it wouldnt have such a hard time trying to go through the filter? Are you guys talking about somthing else? not starting anything but id like to know.
The different pressure pumps have a by pass spring to keep pressure at specs for each particular pump it is the pumps brain the gears in the pump cant control the pressure. the by pass spring is in control cold or hot!

The by pass for the filter opens letting most oil by pass the filter! the filter does not filter all the oil all the time only about 10 percent during running conditions. If you block off the oil bypass all oil is filtered all the time! If you add a heavier spring the percentage goes up!


Jester
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