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RE: Oil pressure issue

To: triumphs@autox.team.net
Subject: RE: Oil pressure issue
From: "Jim Muller" <jimmuller@pop.mail.rcn.net>
Date: Fri, 25 Nov 2005 14:27:47 -0500
On 25 Nov 2005 at 13:42, Cameron Rooke wrote:

> Yes, it's a MK3. And it is a mechanical tach. 

Randall's point, I believe, is that irregularly timed electrical 
pulses can cause an electic tach to misbehave.  Floating points or 
badly out of spec dwell could cause this, as could loose wiring or 
ground behind the dash.  However a mechanical tach isn't susceptible 
to this.  A sticking cable might make the tach jump in much the same 
way that a speedometer can bounce.  But the dwell angle (point gap) 
won't have anything to do with it, and worn dizzy shaft bushings 
probably won't either unless maybe possibly perhaps they cause a 
really bad gear fit.  It's hard to imagine a mechanical tach hitting 
12,000 for any other reason, unless your clutch slipped and the 
engine really took off, in which case I'd wonder that something 
didn't break.

-- 
Jim Muller
jimmuller@rcn.com
'80 Spitfire, '70 GT6+


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