Charrlie that works just fine.
Frank
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| oil pressure https://slantsix.org/forum/viewtopic.php?t=37923 |
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| Author: | low62s [ Wed Nov 11, 2009 2:39 pm ] |
| Post subject: | oil pressure |
Hi ,I have got a slant 225 ,It is a fresh engine ,rebore ,new pistons ,cam ,head etc. On start up cold idle 25 psi Warm,hot idle 25psi in drive cruising at 55mph 45 to 50 psi stationary at 2500 rpm gauge showing 45psi only done about 500 miles since rebuild and not blowing smoke or using oil Oil pump was checked but not rebuilt. I have been told oil pressure is o.k but I feel it is a little low. Any suggestions /comments would be welcomed... cheers Low62s |
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| Author: | THOR [ Wed Nov 11, 2009 3:17 pm ] |
| Post subject: | |
Those figures sound fine to me. The general rule is 10psi per thousand rpm. So for example, 2500rpm you should have at least 25psi. ~THOR~ |
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| Author: | Reed [ Wed Nov 11, 2009 3:51 pm ] |
| Post subject: | |
Sounds a touch low for a fresh rebuild though. I would consider cleaning out the oil pump pressure relief spring. Do a search on the site to find some excellent directions by Doctor Dodge, the slant six guru. |
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| Author: | Doc [ Wed Nov 11, 2009 4:00 pm ] |
| Post subject: | |
The pressure readings are OK but I would like to see a little more hot idle pressure... just for "peace of mind". The good news... reusing a worn factory oil pump with a "known quality" and tested drive gear reduces the chance of OP drive gear failure. The bad news, a used oil pump has impeller wear that reduces it's ability to make low RPM pressure. To get higher low RPM oil pressure you will have to rebuild or replace the pump... or use heavier weight motor oil. DD |
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| Author: | low62s [ Wed Nov 11, 2009 7:01 pm ] |
| Post subject: | |
Thanks for the information thus far much appreciated,Do you think oil pressure would improve with a heavy duty pressure relief spring. Thanks Low62s |
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| Author: | Doctor Dodge [ Wed Nov 11, 2009 9:54 pm ] |
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The releif valve only controls high RPM, max pressure, it will not help with low RPM pressure drop. DD |
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| Author: | Charrlie_S [ Thu Nov 12, 2009 4:14 am ] |
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Quote: The good news... reusing a worn factory oil pump with a "known quality" and tested drive gear reduces the chance of OP drive gear failure. The bad news, a used oil pump has impeller wear that reduces it's ability to make low RPM pressure. DD Just a thought. What do you think about removing the drive gear from an old pump, and installing it on a new pump? |
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| Author: | 66aCUDA [ Thu Nov 12, 2009 6:47 am ] |
| Post subject: | |
Charrlie that works just fine. Frank |
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| Author: | Doc [ Thu Nov 12, 2009 9:08 am ] |
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Quote: Just a thought... What do you think about removing the drive gear from an old pump, and installing it on a new pump?
Yes, many "in-the-know" SL6 engine builders do just that. During our research on the OP drive gear failure problem, we found that Chrysler specs called out a special "M7" (high nickel content) iron to produce the drive gears. Aftermarket oil pump makers (Melling & DynaGear) said they use "gray iron"... sourced from the lowest bidder for finished gears. From that point forward, I stopped using the gears that comes on a new (aftermarket) oil pump. Instead, I swap-on a known, used factory gear or one that I have had case hardened. (carborized) DD |
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