Clatter

Maestro, SEI-V
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72degrees
Posts: 1549
Joined: 31 Aug 2007 21:24
Location: West Midlands

Re: Clatter

Post by 72degrees »

Talking to a 70's Ducati 350 single rider while waiting at the top of Loton Park speed hill climb today after a run he rates Fuchs (Silkolene) semi-synthetic API SF/SG. They also do a 'V twin' 20w-50 mineral oil API CF/SG/SH/SJ.
The FE project 350 engine survived four runs on the Motul 15w-50 semi-synth today without sounding any more like a bag of nails than when it was first started up after the rebuild (on Halfords 10w-040). I'm blaming the roller timing side main bearing and a reground cam without quietening ramps until further evidence becomes apparent.
pedro
Posts: 311
Joined: 04 Nov 2010 21:14

Re: Clatter

Post by pedro »

Cam follower photo as promised
cam followers
cam followers
65aac987-b466-46d5-8da4-19d02a6f04c7_zpsmofxfa16_1.JPG (210.54 KiB) Viewed 8508 times
norbert
Posts: 750
Joined: 15 May 2007 15:15
Location: Lübeck/Germany

Re: Clatter

Post by norbert »

:shock: Never seen a follower like that. This surely has nothing to do with the oil.
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72degrees
Posts: 1549
Joined: 31 Aug 2007 21:24
Location: West Midlands

Re: Clatter

Post by 72degrees »

Those are truly horrific!
Haboola72
Posts: 95
Joined: 05 Jan 2013 15:03
Location: Tarragona, Spain

Re: Clatter

Post by Haboola72 »

Unbelievable.
One for the black museum...
Begs the question ; What were the pushrods like? At some time very bent or very broken..
pedro
Posts: 311
Joined: 04 Nov 2010 21:14

Re: Clatter

Post by pedro »

Pushrods are fine, however the gudgeon pins had very bad wear on them, one big end shell has turned and shagged the crank, it is looking like a lubrication issue. Pump or oil I am not sure, will probably change both.
MickeyMoto
Posts: 2415
Joined: 22 Nov 2008 17:41
Location: Even further oop North

Re: Clatter

Post by MickeyMoto »

Pete,

That is not wear, that is catastrophic failure, possibly caused by heat. As you do not know the bike's history, could a previous owner have let the oil run low or not changed it for a long while? Nothing wrong with Halfrauds 10/40 semi, in my opinion, if changed every 2.5 k miles / 4k kms.

When I was running my Strada 40 miles per day commuting plus other rides, I was using GTX 20/50 with changes every 1000 miles. The engine was perfect. I think the halfrauds oil is probably a better quality than the original GTX.

Low mileage, frequent short runs and not warming up an engine are probably the biggest problems for an engine. Starting a Morini on both chokes always worries me!
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