SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: BBF-ER on August 31, 2015, 08:46:39 AM

Title: oil.
Post by: BBF-ER on August 31, 2015, 08:46:39 AM

Sorry ,sent old message about oil.

Title: Re: oil.
Post by: Bunger on August 31, 2015, 09:07:05 AM

I run straight 50w valvoline vr1 in my 455. Some guys say multi weight 20w/50 but I've never had a problem


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Title: Re: oil.
Post by: BBF-ER on August 31, 2015, 09:17:55 AM

I just got off the phone with a guy at a machine shop in el monte and he said 10/30. That didn't sound correct to me. I think he's thinking break in time.I would think 10 hrs is broken in. What do you think? Thanks.

Title: Re: oil.
Post by: jimpen on August 31, 2015, 09:25:24 AM

I run 50 wt. VR1


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Title: Re: oil.
Post by: BBF-ER on August 31, 2015, 09:34:44 AM

Thanks, 50 wt. it is.

Title: Re: oil.
Post by: brian777 on August 31, 2015, 10:10:41 AM

I run 50 wt vr1


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Title: Re: oil.
Post by: kasper36 on August 31, 2015, 10:56:56 AM

I run vr1 in my 455 have no problems with it

Title: Re: oil.
Post by: Mrblueeyesnick on August 31, 2015, 11:58:33 AM

I run 20/50 vr1


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Title: Re: oil.
Post by: Hoofy on August 31, 2015, 12:27:41 PM

Question, why run a multi-grade oil in a boat? If you boat in the southwest the oil is 80/90 degrees before you even start the engine.

Title: Re: oil.
Post by: GT Jets on August 31, 2015, 12:54:12 PM

Quote from: Hoofy on August 31, 2015, 12:27:41 PM

Question, why run a multi-grade oil in a boat? If you boat in the southwest the oil is 80/90 degrees before you even start the engine.

That is the question, isn't it? .

GT

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Title: Re: oil.
Post by: Mrblueeyesnick on August 31, 2015, 12:55:21 PM

I'm just following what my engine builder (Bostick) told me to run


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Title: Re: oil.
Post by: Flusher on August 31, 2015, 01:33:25 PM

Quote from: Hoofy on August 31, 2015, 12:27:41 PM

Question, why run a multi-grade oil in a boat? If you boat in the southwest the oil is 80/90 degrees before you even start the engine.

Each viscosity rating is for a specific temperature.  The base oil will naturally loose viscosity as temperature increases.  A multi-viscosity has additives, called viscosity modifiers, which are spring-like molecules which extend with temperature, increasing viscosity.

The theory is, thinner oil will flow more freely to the needed areas when the engine is cool.  This can be an issue with the oil filter as excessive pressure can blow it apart.  The clearances increase as the temperature increases, causing less of a restriction to oil flow.  The result is that oil pressure drops.  Remember, pressure is the result of resistance to flow.

I have been looking for a direct correlation between clearance and viscosity, as opposed to the trial and error method, to no avail.

This video is a great presentation illustrating oil flow relative to bearing clearance:  Watch "Oil Pump Pressure vs. Flow" on YouTube
https://youtu.be/7IpJlYssvkM

Title: Re: oil.
Post by: Your Mom on August 31, 2015, 06:20:25 PM

Bostick built my BBF an I run 20/50vr1. I change the oil twice a season.

Title: Re: electrical
Post by: BBF-ER on September 07, 2015, 09:09:30 AM

I'm looking to set up dual batteries in my 76 hallett. Is there a package for this setup?

Title: Re: oil.
Post by: JARVIS on September 10, 2015, 12:43:42 AM

Quote from: Flusher on August 31, 2015, 01:33:25 PM

Each viscosity rating is for a specific temperature.  The base oil will naturally loose viscosity as temperature increases.  A multi-viscosity has additives, called viscosity modifiers, which are spring-like molecules which extend with temperature, increasing viscosity.

The theory is, thinner oil will flow more freely to the needed areas when the engine is cool.  This can be an issue with the oil filter as excessive pressure can blow it apart.  The clearances increase as the temperature increases, causing less of a restriction to oil flow.  The result is that oil pressure drops.  Remember, pressure is the result of resistance to flow.

I have been looking for a direct correlation between clearance and viscosity, as opposed to the trial and error method, to no avail.

This video is a great presentation illustrating oil flow relative to bearing clearance:  Watch "Oil Pump Pressure vs. Flow" on YouTube
https://youtu.be/7IpJlYssvkM

dont know why....but it left me wanting more.  seemed interesting...and somehow a little vague.  dont get me wrong....im no engine builder.  ive built engines....none were V....anything.  more like flat 4.  anyway. 
if i walk away with anything from that video....its that...loser clearances have more bleed off than tighter ones do.  perhaps requiring more....flow? at higher rpm? 
cool video. 
i appreciate the effort of explanation.

Title: Re: oil.
Post by: aquaholic72 on September 10, 2015, 01:50:07 AM

I also run vr1 50 wt..i used to have bad oil pressure fluctuations when i was beating the snot out of my boat with 20/50 in it.... went away with vr1 50...

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Title: Re: oil.
Post by: 455miller on September 10, 2015, 07:12:08 AM

Quote from: kasper36 on August 31, 2015, 10:56:56 AM

I run vr1 in my 455 have no problems with it

You run vr1 50 wt or 20/50 I have a fresh 455 and the guy I bought it from said to run 20/50