Not sure about lifter bore angle on wet liner engines, but Spit/TR6
variants were on a 4.5 degree angle. Ted
On 11/17/2017 7:49 AM, Jerry Van Vlack via Fot wrote:
> The discussion on lifters is of interest to me. I?d like to see some
> independent? verification of the recent statement regarding lifter
> bore being at some angle relative to the cam bore.
> What I believe is the bores are perpendicular to the cam bore but
> offset from lobe centerline to facilitate lifter rotation. I recently
> did some research on cams and lifters for the wet sleeve engines and
> have concluded that factory stock cams and lifters are ground flat and
> lifter bores are offset to facilitate lifter rotation. My bases for
> the conclusion is via verification at a cam grinder that the stock
> lobes (and my Kastner D cam) are ground flat by installing several OE
> cams between centers in the cam grinders equipment and sweeping a dial
> indicator across the lobes and the heals which verified dead flat grind.
> With regard to lifters I took several used but known to be OE lifters
> that were in good shape and placed them end to end, there was no
> rocking and they mated as though they were lapped together. I did the
> same with new lifters from a well know supplier and placed them end to
> end and they rocked showing a slight radius. These radiused lifters
> combined with a flat cam are not matched for lifter rotation and can
> lead to rapid cam and lifter wear. If using a cam that has a taper
> ground lobe with the radiused lifters you will get rotation.
> I have no idea what effect on wear an offset lifter bore has with a
> tapered lobe cam and radiused lifter. Maybe someone else can comment
> on that.
> Perhaps this is old news to many racers but I suspect that some
> engines have been built with mismatched cams and lifters that led to
> rapid cam and lifter wear which was wrongly blamed on oil and break-in
> procedures.
> JVV
> *From:* Mike Harmuth via Fot
> *Sent:* Thursday, November 16, 2017 8:47 AM
> *To:* FoTTriumph
> *Subject:* Re: [Fot] Peugot lifters 504
> "And they've been used in at least one 1296 Spitfire engine, where
> they're much larger in diameter than stock."
>
> Now you have my interest, I have a small block 1296 block with worn
> lifter bores and my engine builder couldn't find a slightly larger
> lifter. I'm guessing he didn't look at a Peugeot parts catalog. Does
> anyone have a lifter part number or a spec so I can investigate
> bringing this block back from the dead? It was mentioned that the TR
> bores holes are not parallel to the block, are the small journal 1296
> bore the same?
>
> thanks
> mike h
>
>
>
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--
Ted Schumacher
tedtsimx at bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA 45877
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