ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
05-30-2007, 10:06 PM
#1
1st Gear Member
Thread Starter
Join Date: Aug 2006
Location: illinois
Posts: 130
ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
I have a DSS 331 pro bullet short block, it has about five hundred miles on it, and I developed a piston slap for about the first minute of firing it up! Sounds only like one piston. I have a high volume oil pump but running the stock pan. I heard this is bad and I also heard that it is ok. I took the motor out and inspected the cylinders, all eight cylinders have score marks (you can't feel them just see them) perpendicular to the wrist pin on the top side and on the bottom side. I was told possibly not enough lubrication, so I pulled a main cap and rod cap off and checked the bearings thinking if the cylinders were scored from no oil that the bearings must be fried. Well to my surprise the bearings were fine and even crank end play was fine! My question is should I run it and just let it slap a little bit and put a stock volume pump back in or what should I do? Of course the warranty is up!
05-30-2007, 10:10 PM
#2
6th Gear Member
Join Date: May 2004
Location: las vegas, nv
Posts: 9,092
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
ORIGINAL: 88 notch
I have a DSS 331 pro bullet short block, it has about five hundred miles on it, and I developed a piston slap for about the first minute of firing it up! Sounds only like one piston. I have a high volume oil pump but running the stock pan. I heard this is bad and I also heard that it is ok. I took the motor out and inspected the cylinders, all eight cylinders have score marks (you can't feel them just see them) perpendicular to the wrist pin on the top side and on the bottom side. I was told possibly not enough lubrication, so I pulled a main cap and rod cap off and checked the bearings thinking if the cylinders were scored from no oil that the bearings must be fried. Well to my surprise the bearings were fine and even crank end play was fine! My question is should I run it and just let it slap a little bit and put a stock volume pump back in or what should I do? Of course the warranty is up!
I have a DSS 331 pro bullet short block, it has about five hundred miles on it, and I developed a piston slap for about the first minute of firing it up! Sounds only like one piston. I have a high volume oil pump but running the stock pan. I heard this is bad and I also heard that it is ok. I took the motor out and inspected the cylinders, all eight cylinders have score marks (you can't feel them just see them) perpendicular to the wrist pin on the top side and on the bottom side. I was told possibly not enough lubrication, so I pulled a main cap and rod cap off and checked the bearings thinking if the cylinders were scored from no oil that the bearings must be fried. Well to my surprise the bearings were fine and even crank end play was fine! My question is should I run it and just let it slap a little bit and put a stock volume pump back in or what should I do? Of course the warranty is up!
a high volume pump in a stock pan at idle is fine. the only time you have to worry is under wot when the pump is spinning at its fastest.
me and my budy built my 331 and it runs great. no oiling issues.
05-31-2007, 12:36 AM
#5
1st Gear Member
Thread Starter
Join Date: Aug 2006
Location: illinois
Posts: 130
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
they gave me six months, I called them within the warranty and told them that it had piston slap, "The Owner of DSS" told me that it was "impossible" because everything is CNC cut. time went on and didn't drive it due to newborn baby, and finally got the motor out and tore apart. I called them back today and they told me that they would look it over, "if" it was their fault they wouldn't warranty it because it was out of warranty. They would give me a break on parts and labor though. Well it is 350 to ship to them and the same to ship back to me. So now you know my predicament. So I'm thinking of putting it back together and running it. Would anybody else run just a stock volume pump up to 6500 rpm's?
05-31-2007, 01:04 AM
#7
6th Gear Member
Join Date: Dec 2006
Location: Citrus County, FL
Posts: 8,007
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
whats the point in buying a crate motor (with a warranty) if they expect you to rebuild it yourself? honestly, that is the worst policy i have EVER heard.
EVER
EVER
05-31-2007, 01:36 AM
#8
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Thread Starter
Join Date: Aug 2006
Location: illinois
Posts: 130
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
I have never heard such a thing either, if they say to do that, why don't they just send you a junkyard crate motor? Should I just use a standard volume oil pump?
05-31-2007, 01:37 AM
#9
3rd Gear Member
Join Date: Apr 2005
Location:
Posts: 585
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
Piston slap is normal in a forged piston motor. It's not because of lubrication. When you run a forged piston in a motor you have to run a bigger piston to wall clearance because a forged piston expands as it heats up. It should slap when cold if you have forged pistons.
05-31-2007, 01:43 AM
#10
6th Gear Member
Join Date: Dec 2006
Location: Citrus County, FL
Posts: 8,007
RE: ANYONE HAVE PROBLEMS WITH 331 LUBRICATION
actually they have gotten better with the metalurgy and along with skirt coatings and such available no longer do you have to have a sloppy motor. that being said, my 302 with its huge .440 dome trw forged slugs was on the loose side of things and i never heard a slap.