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Vtwin rod bearings with synthetic oil #5136256
06/17/19 02:25 AM
06/17/19 02:25 AM
Joined: Jan 2015
Posts: 187
utah,usa
kawie_guy Offline OP
kawie_guy  Offline OP

Joined: Jan 2015
Posts: 187
utah,usa
Ive heard from a couple big wig utv/atv builders that syns spin rod bearings in v twins. Well, I just checked mine today. I've got 18,000 miles on my engine, and it's had a diet of synthetic oil for probably 16,500 of those miles, and my bearings have zero play. They feel brand new.
Guess what I'm putting in the engine when I get it reassembled...... thumbsup

Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136296
06/17/19 05:27 AM
06/17/19 05:27 AM
Joined: Sep 2002
Posts: 3,679
Arkansastan
Propflux01 Offline
Propflux01  Offline

Joined: Sep 2002
Posts: 3,679
Arkansastan
Old Wives Tale.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136317
06/17/19 06:24 AM
06/17/19 06:24 AM
Joined: Dec 2005
Posts: 1,002
Ontario Canada
caprice_2nv Offline
caprice_2nv  Offline

Joined: Dec 2005
Posts: 1,002
Ontario Canada
My dad has ran synthetic in his Kohler v twin lawn tractor for like 15 years now and also in his Harley for the past 8 or something. No issues at all. I've never heard of that one before.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136404
06/17/19 09:07 AM
06/17/19 09:07 AM
Joined: Aug 2011
Posts: 2,294
Lakeside, CA
Blkstanger Offline
Blkstanger  Offline

Joined: Aug 2011
Posts: 2,294
Lakeside, CA
Absolutely false myth type BS


99 Jeep WJ 4.7 200,000mi. Maxlife 10w30, Fram Ultra.
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136422
06/17/19 09:27 AM
06/17/19 09:27 AM
Joined: Dec 2016
Posts: 9,128
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 9,128
Waco, TX
Originally Posted by kawie_guy
a couple big wig utv/atv builders


What proof do they offer up?


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136442
06/17/19 09:56 AM
06/17/19 09:56 AM
Joined: Dec 2003
Posts: 10,354
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,354
Florida, Cape Coral
200+ hours on my B&S 20 HP twin and runs like new. I need data for proof. Ed


2014 CX5 Touring 2.5L :-)
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136501
06/17/19 11:26 AM
06/17/19 11:26 AM
Joined: Jan 2015
Posts: 1,174
missouri
ragtoplvr Offline
ragtoplvr  Offline

Joined: Jan 2015
Posts: 1,174
missouri
Some riders like to lug the engine and set the idle too low because they like the sound. I was told by a rep for S&S once that idle should be 1000 minimum and you should avoid full throttle below about 2K rpm for best life. Below 1000 RPM idle is associated with rod bearing problems.
Rod

Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136518
06/17/19 11:47 AM
06/17/19 11:47 AM
Joined: Apr 2018
Posts: 95
Wethersfield Connecticut
Convert Offline
Convert  Offline

Joined: Apr 2018
Posts: 95
Wethersfield Connecticut
My Moto Guzzi Convert is a V twin ,and when you mention V twin it is assumed its a Harley.

Ducati , Moto Guzzi , and numerous Japanese bikes also have V twins air and water cooled.

In my case ive used Mobil 1 15-50 synthetic in all the Guzzi's that i ridden ---equals well over 500,000 miles

NO ISSUES.

Of course the Guzzi has flat bearings on the big end of the con rods and runs up to 60 lbs. Of oil pressure.

If the bearings are turning its because of being to tight or little to no oil . If that's the case you have other problems to worry about.

TOMB

Last edited by Convert; 06/17/19 11:48 AM.

TOMB
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136523
06/17/19 11:54 AM
06/17/19 11:54 AM
Joined: May 2006
Posts: 4,134
Central Wisconsin
dwendt44 Offline
dwendt44  Offline

Joined: May 2006
Posts: 4,134
Central Wisconsin
Quote
Old Wives Tale.

Started by Harley because they didn't have a synthetic oil with THEIR
name on the bottle. Losing sales to other oil blenders.
Once they found a blender that slapped the Harley name on,
it suddenly OK to run THEIR synthetic oil on a V twin.


My 2¢


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Vtwin rod bearings with synthetic oil [Re: dwendt44] #5136541
06/17/19 12:16 PM
06/17/19 12:16 PM
Joined: Sep 2002
Posts: 3,679
Arkansastan
Propflux01 Offline
Propflux01  Offline

Joined: Sep 2002
Posts: 3,679
Arkansastan
Originally Posted by dwendt44
Quote
Old Wives Tale.

Started by Harley because they didn't have a synthetic oil with THEIR
name on the bottle. Losing sales to other oil blenders.
Once they found a blender that slapped the Harley name on,
it suddenly OK to run THEIR synthetic oil on a V twin.


My 2¢

Pretty much correct. It was stated that a synthetic was “too slippery” and would cause the roller bearings to “skate” and not roll during operation. Of course, once the MoCo came out with their own synthetic, they magically fixed the “bearing skate” problem right before!


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: Vtwin rod bearings with synthetic oil [Re: Linctex] #5136565
06/17/19 12:41 PM
06/17/19 12:41 PM
Joined: Jan 2015
Posts: 187
utah,usa
kawie_guy Offline OP
kawie_guy  Offline OP

Joined: Jan 2015
Posts: 187
utah,usa
Originally Posted by Linctex
Originally Posted by kawie_guy
a couple big wig utv/atv builders


What proof do they offer up?


Not much. One of the gurus claims that he sees spun rod bearings several times a month, and 90% of the time, the owner of the machine said they were running synthetic.
He invites people to swing by his shop if you're ever on the interstate running through Pennsylvania, and he will show you his collection of spun bearings. This is a guy who's world famous for building some of the fastest Kawasaki and Can Am engines on the planet, and he's got a very loyal following.

I may not be a an engine building guru, but I know the chemistry and physics of oil, and what these guys say makes no sense.

Last edited by kawie_guy; 06/17/19 12:43 PM.
Re: Vtwin rod bearings with synthetic oil [Re: Convert] #5136578
06/17/19 01:03 PM
06/17/19 01:03 PM
Joined: Jan 2015
Posts: 187
utah,usa
kawie_guy Offline OP
kawie_guy  Offline OP

Joined: Jan 2015
Posts: 187
utah,usa
Originally Posted by Convert
My Moto Guzzi Convert is a V twin ,and when you mention V twin it is assumed its a Harley.


This is a Kawasaki atv. Its a water cooled, 732cc engine.

Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5136775
06/17/19 04:15 PM
06/17/19 04:15 PM
Joined: Dec 2005
Posts: 1,002
Ontario Canada
caprice_2nv Offline
caprice_2nv  Offline

Joined: Dec 2005
Posts: 1,002
Ontario Canada
I will be running full synthetic in my Honda CX 500 when I get it fixed up one day. I run synthetic in everything including my 5hp Briggs and Stratton.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Vtwin rod bearings with synthetic oil [Re: kawie_guy] #5138056
06/19/19 01:37 AM
06/19/19 01:37 AM
Joined: Jul 2003
Posts: 5,226
New Zealand
Silk Online content
Silk  Online Content

Joined: Jul 2003
Posts: 5,226
New Zealand
Originally Posted by kawie_guy

This is a Kawasaki atv. Its a water cooled, 732cc engine.


What sort of bigend bearings ? The Old Wives Tale is about roller skid on roller bigends. Nothing is going to happen with a plain bearing...or a roller bearing.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
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