360 mopar oiling
 

Whats the trick to keep #6 rod bearing from spinning in my stocker?
Have lost it on the first engine, stock block & crank.
Just lost it in a Race block & different crank.


Have built several Small block MoPars for bracket racing, no bearing issues.


Tell me what I'm doing wrong.

Re: 360 mopar oiling
 

RPM? Any oil system mods, yet?

Re: 360 mopar oiling
 

Std pressure pump.
Feed to the rocker shafts restricted.
Maintains 65PSI @ idle, 70PSI @ 7100RPM

Re: 360 mopar oiling
 

Since you have to use a stock pan, my guess, running out of oil in the sump. Are you using the center sump pan? If so use the Magnum rear sump pan, it will fit the 360 engine. Run more oil, keep it from foaming, air compresses, oil doesn't. Run thin oil, to heavy an oil can't get back to the pan quick enough. Just my opinions...
Mike

Re: 360 mopar oiling
 

Had a Dakota pan on my Volare 360 and had no issues so agree that if using the center sump pan you’re probably running it out of oil, especially if you’re taking out oil for ET...probably turning it higher than bracket motors, what is it turning in the traps?

Re: 360 mopar oiling
 

How much clearance? What's the crank journal diameter?

Re: 360 mopar oiling
 

Had that happen to me, on a bracket engine,we did some mods to oil passages, and cut the oil off to the lifters.

Re: 360 mopar oiling
 

Using a Dakota rear sump pan.
5 quarts of oil with big oil filter.

Re: 360 mopar oiling
 

2.5-3 clearance
rod journal 2.125
main - 2.80

Re: 360 mopar oiling
 

If you are using the newer R block that has the lifter valley closed off, you need to provide more drain back to the pan. Also check the oil filter mounting boss. That area is different than the stock blocks and you will need to add an extra cork gasket between the plate or adapter and the block. If you are running the filter plate, make sure it has 6 or 8 holes and not 4 as some plates do.

Re: 360 mopar oiling
 

we use a smaller filter, ph 43, adds oil to pan. 5 1/2 quarts. total. no issues/ also,full groove mains.

Re: 360 mopar oiling
 

I've run stock crank 360s to 7300-7400 in a non-Stock application with multiple style big pans, cross-drilled crank, accu-sump, System 1 filter, big pump, 002-0025 clearance, etc. etc. and still knocked the bearings out of it. The issue is getting oil on the crank and keeping it there instead of being bled off to other places, like the left galley, and the cam and heads. You have to fix the block, specifically the oiling system, and keep the oil on the crank. Some of the stuff I've done isn't legal for Stock. Are bushed lifters and/or non-OE plumbing in the lifter valley legal?

Re: 360 mopar oiling
 

If you use a windage tray take it out, same with a crank scraper, and the biggest difference you can do is use the oil accumulator, i had the same issue until i used the oil accumulator.

Tim

Re: 360 mopar oiling
 

Should be plenty. I use a min of one thou per inch journal diameter.

Re: 360 mopar oiling
 

Lots of good information here. You may want to consider installing a 15 lb. pressure switch coupled to the ignition to kill it in the event of a low pressure situation. CMcAllister is correct. At your clearances if that is what they are, at 40lbs of oil pressure, it would not hurt itself at 7000 RPM's. Keeping oil on it is the key. So as CMcAllister was saying, excess clearances and lifters/rockers, etc... add to low pressure situations. So a low pressure switch hooked to the ignition, will be a safeguard. Hope this helps.
Thanks,
Vance

Re: 360 mopar oiling
 

Send me your email address, My dad did a ton of testing when the X block was developed, I have a list of stuff to drill out on the block. If you would like to talk to Herb hisself I can get him in touch with you. Herbieamccomedy@gmail.com Google A engine oiling mods herb mccandless. It may still come up. We drill almost every internal passage in the block.

Re: 360 mopar oiling
 

Drilling passages to the mains, opening passages in the rear of the block, port matching the pump to the cap, massaging sharp corners, tubing the block (once, what a mess, just bush the bores), even fabing a dual pickup assembly were among the first things I tried. While they are, without doubt, beneficial, It didn't address the core problem, which is keeping oil on the journals in question. Measuring oil pressure at the port on the rear of the block tells you nothing about what is happening to the pressurized oil once it gets to the #2 and 4 mains.

Re: 360 mopar oiling
 

As a side note, we ran stock bottom end, steel crank 340s to 7800 for a long time with none of these issues. Cut an iron 360 crank for in a 340 block to get some cheap stroke, and almost right away, spun a bearing and broke the rod. Put a new stock bottom end 360 together and have the same issue, although I paid attention to it and would fix it as needed rather than blow it up. Something about the increase in stroke and the iron crank that doesn't like to be spun beyond about 6800. Some folks get away with it for some reason.

Re: 360 mopar oiling
 

Thanks, I'll send him a email.

Re: 360 mopar oiling
 

I read, or heard, somewhere that the mopar crank oil feeds holes are drilled in the wrong place.?? Rod or main, can't remember. But I'm thinkng the full groove main bearing would solve the main holes.
It was said to copy a SB Chevy crank, they seem to have no problem with this issue.
I'll compare as soon as I can get my hands on one.
Mike

Re: 360 mopar oiling
 

Old school lifters without oil band, better vs newer lifters that also fit magnum engines that have an oil band can be an issue with unbushed lifter bores. For reference I believe the Comp numbers are 821-16 for old style & 826-16 vs magnum style. Can have oil pressure loses from oil galleries leaking above or below the lifter bore.
Magnum style lifters have pushrod oiling and if you have ball/ball type hollow pushrods, you can be oiling the rockers from both directions. From the lifters and thru the block. Even though you think you are restricting thru the block, you may still be flooding the covers. Some blocks also hold 1/2 quart or more in the valley before draining to pan.

Many curse the work of tubing lifter oil galleries in a stock block, but I have 'never' spun a bearing in a tubed block even at 8000 in a 340. I'm sure Herb could attest to this.

Other problem areas can be from constant detonation on that particular cylinder from stock dual plane intake manifolds and tuning issues. Lean or high exhaust temp on that cylinder from poor factory intake?

Tom Hestness