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Banned
Join Date: Feb 2008
Posts: 18,646
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Best way to break in a V twin engine?!
I just finished up a rebuild on a xb12, complete new lower, and top end. I filled her up with 10w30, and shes purring like a lion. I keep reading different ways to break in the engine. For instance for "x" amount of miles keep it under 3k, then progressively increased. Another is to keep it under 4 grand for the first 500 miles. I know I don't want to redline it obviously, but what do y'all recommend?
Last edited by Arizona_928; 06-16-2014 at 04:33 AM.. |
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06-08-2014, 03:17 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
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Spendy engines are broken on a dyno all things monitored.
With out that tool, most will say a a couple short idles to get things used to each other and check O.P. cooling ETC. (30 sec or so) Complete cool dwns in between. Then progressive loads and RPM s. Each with cool dwns.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-08-2014, 04:35 AM
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Registered
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New lawnmower?
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06-08-2014, 06:49 AM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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I am an advocate of drive it hard after 30 seconds of idle. There are numerous a people proving this works and lots of posts online.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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06-08-2014, 01:21 PM
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Hell Belcho
Join Date: Sep 2006
Location: Oz
Posts: 9,249
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Run it hard.
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Saved by the buoyancy of citrus. |
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06-08-2014, 01:30 PM
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I'm with Bill
Join Date: Jun 2005
Location: Scottsville Va
Posts: 24,186
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Quote:
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Electrical problems on a pick-up will do that to a guy- 1990C4S |
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06-08-2014, 01:32 PM
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Banned
Join Date: Apr 2005
Location: Columbus, OH
Posts: 18,162
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Look, I want to help out a fellow Pelican. Have the bike shipped here, and I will spend this summer laboriously breaking it in for you.
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06-08-2014, 01:38 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
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Ask asphaltgambler,
He knows his way around a V twinn. seriously
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-08-2014, 02:45 PM
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Banned
Join Date: Feb 2008
Posts: 18,646
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I let it idle to warm it up, then to completely cool. Did that a few times then I ripped on it. Didn't pass 4k in gear.
Last edited by Arizona_928; 06-16-2014 at 04:34 AM.. |
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06-08-2014, 09:49 PM
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Banned
Join Date: Feb 2008
Posts: 18,646
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 It seems like the oil pressure has spiked and started blowing things up. |
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06-08-2014, 11:34 PM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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If you want it to run like a harley, punch a small hole in the crankcase and switch the plug wires around.
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06-09-2014, 02:06 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
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You might have the oiling system hooked up wrong, Is there a air oil separator up top ??
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-09-2014, 02:35 PM
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Team California
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Quote:
 There is only one correct way to break in piston rings to cylinder walls, several here have already alluded to it. I have built several motors from the crank-up with 100% success, (knock on wood). Here is the break-in guru: Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power
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Denis |
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06-09-2014, 03:24 PM
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Registered
Join Date: Apr 2000
Location: Mid-life crisis, could be anywhere
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Whenever I rebuild a motor, I do 3-4 20 minute gentle heat cycles, with complete cool down in between. Then, I let her rip!
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'95 993 C4 Cabriolet Bunch of motorcycles |
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06-09-2014, 05:41 PM
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Air Medal or two
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Location: cross roads
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You need to consult someone that knows your add ons.
All I can add, Is, There is rubber umbrella oil separators in the rocker boxes that often get installed wrong. Piston rings can be installed upside dwn. If one does not their way around a recip lots can be wrong. If it is a oil blow problem I would think your bottom end is ok . Did you have Oil P? If so your bearings more then likely had oil. Big cylinders need to swap air back and forth between crankcase and valve train upstairs . I am going to guess there is a part in backwards more then anything else.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-09-2014, 06:35 PM
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Banned
Join Date: Feb 2008
Posts: 18,646
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The xb has just the pcv. The xl evo has the umbrella valve you are talking about.
The engine is running strong now. Thanks for your help! Last edited by Arizona_928; 06-16-2014 at 04:33 AM.. |
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06-11-2014, 09:24 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-12-2014, 07:43 PM
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