[Fot] Peugeot lifters 504

[Jerry Van Vlack]

Scott Barr has corrected me and he’s correct. It was stated as 5 degrees so had to be relative to cylinder bores not cam bore.
“Rather, lifter bore being at an angle relative to the cylinder bores.” 

From: Jerry Van Vlack 
Sent: Friday, November 17, 2017 7:49 AM
To: Mike Harmuth ; FoTTriumph 
Subject: Re: [Fot] Peugeot lifters 504

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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