[Fot] Oversize lifter bore

[Chip Collingwood]

Larry,

I miss spoke. The increased diameter would not change valve timing. It
would though give you the ability to increase the profile of the cam
without running off the edge...a good result for a full race
motor...expanding possibilities


> [Original Message]
> From: Larry Young <cartravel at pobox.com>
> To: <fot at autox.team.net>
> Date: 2/5/2011 11:22:38 AM
> Subject: Re: [Fot] Oversize lifter bore
>
> Chip, could you explain this?  How does a larger diameter lifter change 
> the valve timing?
>
> For the TR3/4 I've found that 99% of the available cams are designed 
> using the lowest common denominator for lifters.  In the US, the 
> smallest common lifter is the SBC at 0.842.  I've often wondered whether 
> some of these grinds find their way into Spitfire and TR6 engines with 
> the 0.800 lifter.  The result would be a cam that would run off the edge 
> of the lifter. One can always get more lift by using a cam designed for 
> a larger lifter.
> Larry Young
>
> On 2/4/2011 6:45 PM, Chip Collingwood wrote:
> > This mod will open and close the valve sooner but will
> > not effect maximum lift...
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