Re: Oil wt. in rebuilt 340 ?
[Re: ademon]
#2471250
03/24/18 10:05 AM
03/24/18 10:05 AM
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Joined: May 2010
Posts: 177 NC
Sixt8Chrgr
member
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member
Joined: May 2010
Posts: 177
NC
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Go to napa and get 10w30 Valvoline VR1. 20w 50 is to thick unless you have large clearance I agree. I have had several engines rebuilt and end up putting the viscosity in the engine that the owners manual calls for. By using the Valvoline VR 1 you have a high Zinc content oil which is what you want as others have said.
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Re: Oil wt. in rebuilt 340 ?
[Re: 5carguy]
#2471362
03/24/18 03:02 PM
03/24/18 03:02 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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BTW how high on pressure does your gauge read ? I've seen several new high volume pumps for SB LA motors have BB bypass valves in them which made the pump have over 140 Lbs. pressure while running above 1200 RPM with cold oil The BB bypass valves have no holes in the bodies, the SB LA motor should have three or more holes in the sides of them I had to drill a hole in the plug on the bypass passage to get the valves out and then either weld that hole up or use a new welsh cup after replacing the valve with the proper one, problems solved
Last edited by Cab_Burge; 03/24/18 03:03 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil wt. in rebuilt 340 ?
[Re: rarefish]
#2471457
03/24/18 06:58 PM
03/24/18 06:58 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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That is one of the holes in the bypass valve to allow the oil to flow through it once it is forced open by the pump pressure, your golden The BB valves have no holes in them
Last edited by Cab_Burge; 03/24/18 06:59 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil wt. in rebuilt 340 ?
[Re: PDR Dude]
#2471577
03/24/18 10:42 PM
03/24/18 10:42 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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Had a 340 rebuilt about a year ago. The machine shop was very adamant about using Brad Penn break in oil for the first 500 miles. Keep your foot out of it and vary the RPMs as much as possible. It really sounds like your machine shop is really old school on clearances and parts You really need to load the rings as soon as possible to help seat them, DO NOT baby the motor for that long
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil wt. in rebuilt 340 ?
[Re: Cab_Burge]
#2471923
03/25/18 06:19 PM
03/25/18 06:19 PM
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Joined: Jan 2003
Posts: 2,263 New York
rarefish
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,263
New York
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Take the pressed in plug out and examine the insides so you can see how that bypass valve works The valve has to be shoved past it seat to make the holes in the valve allow oil to bypass into the other part of the pump Let us know what you do and find out When I get the chance I will do that. I first need to find where I put that pump. Question.. I know they were standard pressure and high pressure relief springs, but are the relief springs interchangeable between the SB and BB pumps?
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Re: Oil wt. in rebuilt 340 ?
[Re: 5carguy]
#2471996
03/25/18 09:52 PM
03/25/18 09:52 PM
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Joined: Oct 2008
Posts: 506 Utah, USA
1964superstock
mopar
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mopar
Joined: Oct 2008
Posts: 506
Utah, USA
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Speedway Motors has Joe Gibbs Driven Oil on sale right now. Hard to beat this quality oil for your 340 engine. HR-2: 10W-30, or HR-5: 10W-40. https://www.speedwaymotors.com/Driven-Racing-Oil-02007-HR2-Conventional-10W30-Motor-Oil-12-Quarts,272680.html http://www.drivenracingoil.com/
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