"Used exclusively for racing"? I've got one word for ya:
Synthetic.
When you get a new engine or fresh rebuild, put the "mineral oil" in for
break-in -- at least one race session, one autocross, or a nice long dyno
run. Then drain and replace it with the synthetic.
Is synthetic pricey? Sure. What's your engine worth?
20-50 vs. 10-40? If 20-50 is overkill, so what? But if 10-40 proves not
enough, uh-oh! Worst-case scenario, with the heavier oil it might be hard to
start on a cold day. With the lighter oil it might not do the job causing
expensive repair.
BTW, if you don't already have one, put an Accusump in. Mine probably saved
my engine when I ripped off my oil cooler last October. That worst-case
scenario above assumes an Accusump so even with 20-50 you still have
pressure in the engine before you start it.
--Rocky Entriken
----- Original Message -----
From: "Scott Janzen" <s.janzen@comcast.net>
To: "'Friends of Triumph' Triumph" <fot@autox.team.net>
Sent: Monday, January 04, 2010 10:36 AM
Subject: [Fot] Oil weights?
> I've been running 20-50 Brad Penn (high zinc) for the last season, but
> as I'm about to order some for the upcoming season, I'm wondering
> whether the engine really needs 20-50, as opposed to 10-40. Used
> exclusively for racing, engine with fairly tight bearing clearances
> (when assembled).
>
> Thoughts?
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