Forums
NautiqueParts.comNautiqueSkins.com - Correct Craft Upholstery and Part
  New Posts New Posts RSS Feed - Oil Pressure Problem 351w
  FAQ FAQ  Forum Search   Register Register  Login Login

Oil Pressure Problem 351w

 Post Reply Post Reply Page    <12
Author
Ryan351w View Drop Down
Groupie
Groupie


Joined: May-24-2009
Location: United States
Status: Offline
Points: 43
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan351w Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 3:31pm
just a little rule of thumb...10psi per 1,000 rpms.

The better the machining the less pressure needed. I talked to a head guy at Melling and he was telling me that the NASCAR engines run only 70-80psi. Granted these motors come apart every race, regardless of that the motor would take itself apart if there wasn't enough pressure. Remember these motors turn over 9,000!



Another little trick, diesel oil. I run it in everything, 500hp mustang, aurora, boat, diesel truck. The diesel oil is awesome. My buddies dad runs it in his blown 340, in the motor and the blower. It has alot of additives in it that were takin out that protected metal-to-metal contact. It was mainly there for lifters to cam lobes. But when roller lifters and OHC's came on the scene they decided that it wasn't needed anymore. Luckily diesel motors still use flat tappet lifters so those additives are still needed.



Another piece of info-pump placement in the motor packaging itself has no effect of where you will get higher or lower oil pressure. The oil galleys are drilled where they are drilled. They feed the mains and rods then depending on the motor it will pull from the main galleys to feed the lifters/cam/push rods. So running a "jumper" line from the front to back or vise versa is helping a bad spot (low oil pressure) in the motor.
Back to Top
TRBenj View Drop Down
Grand Poobah
Grand Poobah
Avatar

Joined: June-29-2005
Location: NWCT
Status: Offline
Points: 21104
Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 3:52pm
Originally posted by Ryan351w Ryan351w wrote:

Another little trick, diesel oil. I run it in everything, 500hp mustang, aurora, boat, diesel truck. The diesel oil is awesome. My buddies dad runs it in his blown 340, in the motor and the blower. It has alot of additives in it that were takin out that protected metal-to-metal contact. It was mainly there for lifters to cam lobes. But when roller lifters and OHC's came on the scene they decided that it wasn't needed anymore. Luckily diesel motors still use flat tappet lifters so those additives are still needed.

Careful! Most diesel oils have removed the heavy metal additives to comply with the new emissions equipment. This change has come about within the last few years. Only a select few grades still have the required ppm of ZDDP that flat tappets need. Rotella straight weights and Valvoline Racing VR1 still have pretty high levels of the stuff- I run the VR1 in all of my flat tappet boats.
Back to Top
GottaSki View Drop Down
Grand Poobah
Grand Poobah


Joined: April-21-2005
Location: NE CT
Status: Offline
Points: 3327
Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 3:57pm
Originally posted by Ryan351w Ryan351w wrote:

Luckily diesel motors still use flat tappet lifters so those additives are still needed.


Consider checking your sources.

You may have the order backerds, the failing cayalysts and extended gov'ment mandates for emissions warrantees drove the reduced zinc oil blends that neccessatated the roller cams, not the other way around. Automakers didn't just convert their fleets roller to be kewl.

While i agree the oil is better, the diesel oil has much reduced zinc over the last two years, so be wary as this progresses. This is due the same driving forces.
I think you are mistaken about the flat tappet lifters. I can report GM diesels haven't used flat tappets since the 350 olds/diesel abortion almost 30 years ago. Even the old detroit two-strokes are roller.
"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole
Back to Top
Ryan351w View Drop Down
Groupie
Groupie


Joined: May-24-2009
Location: United States
Status: Offline
Points: 43
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan351w Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 6:07pm
Gottaski-http://www.cumminsdieselspecs.com/67.html My source. And in non-diesel engines rollers just allowed them more aggressive lobe profiles which = more power. Less duration/more lift. Idles better too. Possible friction advantage could be part of it too.
There have been roller motors for a LONG time in the OEM field. I know in the mustang the roller was introduced in 85. Dodges' in 91. Oil changed in early 2000's

TRB-That’s exactly the oil I’m referring to. Rotella-T is a diesel oil. And when I buy generic stuff, I make sure they have the same mount of additives.
Back to Top
8122pbrainard View Drop Down
Grand Poobah
Grand Poobah
Avatar

Joined: September-14-2006
Location: Three Lakes Wi.
Status: Offline
Points: 41040
Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 6:30pm
Originally posted by Ryan351w Ryan351w wrote:

TRB-That’s exactly the oil I’m referring to. Rotella-T is a diesel oil. And when I buy generic stuff, I make sure they have the same mount of additives.


Ryan,
Glad you stated the Rotella but keep in mind that it's the straight weights that have the ZDDP. I'd hate for someone with a flat tappet engine to be misinformed. The ZDDP has been researched and discussed at length here.

I like Tim run the VR1 in all my engines.

BTW, I am hearing about cam failures on old engines. A couple from flat head Hercules owners who were using what they thought was "good" oil!!!!


54 Atom


77 Tique

64 X55 Dunphy

Keep it original, Pete
<
Back to Top
Ryan351w View Drop Down
Groupie
Groupie


Joined: May-24-2009
Location: United States
Status: Offline
Points: 43
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan351w Quote  Post ReplyReply Direct Link To This Post Posted: February-08-2010 at 10:04pm
On a quick search while cooking I found that the Rotella with "triple protection" has..."Multigrade Oil SAE 15W-40 with Triple Protection Technology, our API CJ-4/SM specification product, typically contains about 1200 ppm zinc and 1100 ppm phosphorous as manufactured."
Back to Top
Greg_SA View Drop Down
Senior Member
Senior Member


Joined: April-19-2007
Location: South Africa
Status: Offline
Points: 168
Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg_SA Quote  Post ReplyReply Direct Link To This Post Posted: February-09-2010 at 5:15am
Hi,

Thanks very much for the responses... So it sounds like my old pressure is okay, but I'll double check with the mechanical gauge, and keep an eye on it :)

Regards,
Greg
1989 Ski Nautique (SN2001)
Back to Top
eric lavine View Drop Down
Grand Poobah
Grand Poobah


Joined: August-13-2006
Location: United States
Status: Offline
Points: 13413
Post Options Post Options   Thanks (0) Thanks(0)   Quote eric lavine Quote  Post ReplyReply Direct Link To This Post Posted: February-09-2010 at 11:04am
many cam failures lately on the flats, 3 to count on rightie bbc's, not a good percentage since they were the only 3 i took apart this summer, there are zinc additives out there also and probably wouldnt hurt on top of the oil change, i was a skeptic, now im not
"the things you own will start to own you"
Back to Top
GottaSki View Drop Down
Grand Poobah
Grand Poobah


Joined: April-21-2005
Location: NE CT
Status: Offline
Points: 3327
Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: February-09-2010 at 11:22am
Originally posted by Ryan351w Ryan351w wrote:

There have been roller motors for a LONG time in the OEM field. I know in the mustang the roller was introduced in 85. Dodges' in 91. Oil changed in early 2000's


Ryan since it appears you are a student of automotive trivia, you may find it interesting the GM/allison 6.2L diesel was roller for its introductory year of 1982, three years before the mustang 5.0 HO roller cam engine, and even the 350 olds abortion i spoke of went roller half in the latter half of its run in 1980.
"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole
Back to Top
eric lavine View Drop Down
Grand Poobah
Grand Poobah


Joined: August-13-2006
Location: United States
Status: Offline
Points: 13413
Post Options Post Options   Thanks (0) Thanks(0)   Quote eric lavine Quote  Post ReplyReply Direct Link To This Post Posted: February-09-2010 at 12:05pm
i recently took a 4.3 vortec apart, roller cam, roller lifters, a balance shaft, real potential for some power there, i see alot of them in boats already and pretty lean on the fuel useage. not recomending them for a ski-boat but was pretty surprised to see the roller rockers
"the things you own will start to own you"
Back to Top
eric lavine View Drop Down
Grand Poobah
Grand Poobah


Joined: August-13-2006
Location: United States
Status: Offline
Points: 13413
Post Options Post Options   Thanks (0) Thanks(0)   Quote eric lavine Quote  Post ReplyReply Direct Link To This Post Posted: February-09-2010 at 12:06pm
i was thinking of bolting 2 of them together though, a nice v-12????lol
"the things you own will start to own you"
Back to Top
Preston01 View Drop Down
Newbie
Newbie


Joined: September-23-2018
Location: Mississippi
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote Preston01 Quote  Post ReplyReply Direct Link To This Post Posted: October-09-2018 at 1:00am
Hey y’all,
I am experiencing the same issues on my 83FN. Would replacing the 160 degree thermostat with a 140 degree help with the viscosity? Any other suggestions?
Back to Top
 Post Reply Post Reply Page    <12
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Copyright 2024 | Bagley Productions, LLC