Read line is in direct proportion to valve float and a function of
the stroke, piston to valve clearances etc. 3800 rpm or above on a
stock 235 with babbit bearings to me is readline, if the valves don't
float the rods will soon eject themselves... On a rebuild with insert
bearings and reworked rods and high strength bolts and with the
assembly balanced and the valve springs replaced with higher
installed pressure and all clearances adjusted for revs higher than
3500 its still possible but remember these are long stroke engines and
the valve train is of ancient design by todays standard...Take heed
here, and err on the side of caution.
rogerg
51-3100 AD Stocker
> From: "Allen Jones" <jonesal@u.washington.edu>
> To: <oletrucks@autox.team.net>
> Subject: Re: [oletrucks] tire size and RPMs
> Date: Thu, 3 Feb 2000 08:28:40 -0800
> Organization: University of Washington
> Reply-to: "Allen Jones" <jonesal@u.washington.edu>
> Speaking of rpms..... on another note, I searched the archives for comments
> on what "red line" would be for an inline (typically a 235 or a 261) and
> what "normal" highway rpms might be to maintain reasonable engine longevity.
> I only found one, two message thread that stated 3000 rpm driving on the
> highway should be perfectly fine on a regular basis, with red line probably
> at about the 3500 to 4000 rpm range. Any other opinions in this regard?
>
> I have a fresh rebuild and want to treat it nice......
>
> Thanks,
> Allen in Seattle
> '50 3100
>
>
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