| Author |
Message |
hot cool vw
Samba Member
Joined: February 11, 2014
Posts: 21
Location: Leominster, Mass
|
 Posted: Sat Sep 16, 2017 10:04 am Post subject: Oil pressure |
 |
|
Running 10-30 oil in new 1915 motor, when cold oil pressure is at 60 lbs. when motor heats up to 180 deg the oil pressure drops to 20 lbs.
Should I be using a heavier weight oil? |
|
| Back to top |
|
 |
67rustavenger 
Samba Member
Joined: February 24, 2015
Posts: 9762
Location: Oregon
|
| Posted: Sat Sep 16, 2017 10:24 am Post subject: Re: oil preasure |
|
|
Your oil pressure is fine.
Remember for every 1K in rpm you should gain 10 psi of oil pressure.
Be careful with 60 psi cold. Too much accelerator at startup and you can burst a cooler. Ask me how I know 
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
|
| Back to top |
|
|
rockerarm
Samba Member
Joined: December 16, 2009
Posts: 3552
Location: Los Angeles
|
| Posted: Sat Sep 16, 2017 11:28 am Post subject: Re: oil preasure |
|
|
Hi.
There are so many variables with oil pressure/overheating, etc.
Even though your engine is not stock this VW standard should apply.
With 30 wt oil, 160 degrees temp, at 2500rpm the minimum oil pressure is 28psi and the optimum/new spec is 42psi.
With this test variables as oil viscosity and temp are set. It is a good test.
It does parallel the 10psi per 1000rpm.
Hope this helps, Bill.
Is your current 10w-30 have sufficient additives for new breakin procedures? Some builders have even suggested a 20 wt oil for this. |
|
| Back to top |
|
|
iowegian
Samba Curmudgeon
Joined: February 16, 2005
Posts: 9829
Location: Somewhere between Dubuque and Keokuk
|
| Posted: Sat Sep 16, 2017 11:56 am Post subject: Re: oil preasure |
|
|
| 67rustavenger wrote: |
Your oil pressure is fine.
Remember for every 1K in rpm you should gain 10 psi of oil pressure.
Be careful with 60 psi cold. Too much accelerator at startup and you can burst a cooler. Ask me how I know |
O.K., I'll bite----------how do you know?  |
|
| Back to top |
|
|
67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9762
Location: Oregon
|
| Posted: Sat Sep 16, 2017 12:00 pm Post subject: Re: oil preasure |
|
|
| iowegian wrote: |
| 67rustavenger wrote: |
Your oil pressure is fine.
Remember for every 1K in rpm you should gain 10 psi of oil pressure.
Be careful with 60 psi cold. Too much accelerator at startup and you can burst a cooler. Ask me how I know |
O.K., I'll bite----------how do you know? |
Over pressured two coolers on a fresh 1776 I built twenty years ago. Used too thick of oil and at the hit of the key. Heard a faint pop and saw oil running out under the engine.
Went to lighter oil and never looked back.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
|
| Back to top |
|
|
rockerarm
Samba Member
Joined: December 16, 2009
Posts: 3552
Location: Los Angeles
|
| Posted: Sat Sep 16, 2017 12:37 pm Post subject: Re: oil preasure |
|
|
Same here. 40 years ago finished my first non-oem motor.
DDS oil pump, full flow, Val 50wt Racing Oil, and a Rabbit Diesel oil filter (it was the only filter available at the time).
Boy, that pump can flow some oil! Installed a Fram HP1 and that cured it. Mind you this was the buggy mentality back then. |
|
| Back to top |
|
|
hot cool vw
Samba Member
Joined: February 11, 2014
Posts: 21
Location: Leominster, Mass
|
| Posted: Sat Sep 16, 2017 1:04 pm Post subject: Re: oil preasure |
|
|
| Thanks everyone for the advice, I feel better now. |
|
| Back to top |
|
|
Helfen
Samba Member
Joined: January 19, 2009
Posts: 3450
Location: Vulcania
|
| Posted: Sat Sep 16, 2017 1:44 pm Post subject: Re: oil preasure |
|
|
| 67rustavenger wrote: |
Your oil pressure is fine.
Remember for every 1K in rpm you should gain 10 psi of oil pressure.
Be careful with 60 psi cold. Too much accelerator at startup and you can burst a cooler. Ask me how I know |
The pressure relief valve bypasses the cooler when the engine is cold, unless yours got stuck.
The test procedure is for oil temp is to be at 120 degrees, oil is straight 20W and oil pressure should be minimum 7psi at idle and minimum 28psi at 2,500 rpm. This is for both 36 & 40 hp. 1200'a and 1300. This also applies to 1966-1978 1200's with the large oil pump.
These spec's are not from Bentley, they are from the workshop manuals directly from VW school. |
|
| Back to top |
|
|
heimlich
VWNOS.com
Joined: November 20, 2016
Posts: 6597
Location: Houston, Texas
|
| Posted: Sat Sep 16, 2017 8:13 pm Post subject: Re: Oil pressure |
|
|
Nothing to do with your issue but you mentioned weight, does your oil have zinc in it?
_________________
www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
|
| Back to top |
|
|
planenut
Samba Member
Joined: April 12, 2012
Posts: 334
Location: Georgia
|
| Posted: Sun Sep 17, 2017 4:16 am Post subject: Re: Oil pressure |
|
|
| My stock 1600 had overheating problems until I lowered the oil pressure to factory specs. Don't always think high oil pressure is a good thing. |
|
| Back to top |
|
|
Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76911
Location: Sneaking up behind you
|
| Posted: Sun Sep 17, 2017 4:30 am Post subject: Re: Oil pressure |
|
|
Thick oil makes the engine work harder pushing it. Harder means hotter.
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare |
|
| Back to top |
|
|
bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
|
| Posted: Sun Sep 17, 2017 5:18 am Post subject: Re: Oil pressure |
|
|
| planenut wrote: |
| My stock 1600 had overheating problems until I lowered the oil pressure to factory specs. Don't always think high oil pressure is a good thing. |
when pressure is too high, the oil cooler is bypassed, thus oil is hotter.
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
|
| Back to top |
|
|
heimlich
VWNOS.com
Joined: November 20, 2016
Posts: 6597
Location: Houston, Texas
|
| Posted: Sun Sep 17, 2017 9:49 am Post subject: Re: Oil pressure |
|
|
| Glenn wrote: |
Thick oil makes harder pushing it.
Harder
hotter.
|
Have you been speaking with Cusser?
_________________
www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
|
| Back to top |
|
|
bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
|
| Posted: Sun Sep 17, 2017 11:29 am Post subject: Re: Oil pressure |
|
|
| kawfee wrote: |
| Glenn wrote: |
Thick oil makes harder pushing it.
Harder
hotter.
|
Have you been speaking with Cusser? |
true there is more heat spent in friction in pushing thicker fluid more energy consumed to push it resulting in heat. but the second factor is the vw oil cooler bypass pressure valve, at high pressure, cooler is bypassed. thus oil gets hotter with no flow thru the cooler. If viscosity remains too high to activate the pressure valve the thicker oil can reach much higher temperatures than a thinner oil.
Either way, factory recommeneded wieghts and the multi vis equivelents should used on stock enignes. The pressure valve spring can be changed, plunger length altered,
etc..... to alter its opening pressure this would seem to be a prudent change if one uses oil types outside the factory limits. and of course upon rebuilding even a stock motor, the spring, plunger, screw plug and bore of the pressure valve should be checked to make sure they are the correct parts and not worn.
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
|
| Back to top |
|
|
glutamodo
The Android
Joined: July 13, 2004
Posts: 26315
Location: Douglas, WY
|
| Posted: Sun Sep 17, 2017 2:15 pm Post subject: Re: Oil pressure |
|
|
I'll never use an incorrect pressure relief spring again. I put one in by mistake once and the resulting oil pressure was high enough to provide too much oil at the pulley end of the crank, overpowering the oil slinger on the crank and the return threads on the stock pulley and causing oil to get slung all over the engine. (this was a single-relief engine, I should add. I don't think that would have happened on dual relief)
_________________
Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox. |
|
| Back to top |
|
|
|
