[Fot] Roller life

[Larry Young]

The incentive for doing a roller cam is less for a TR3/4 engine than for 
a SBC due to the diameter of the lifters (0.935 for TR, 0.842 for SBC).  
The larger lifters allows you to use a more aggressive profile without 
running off the edge.
Larry Young

Jim Cun wrote:

>Jack,
>        I thought as much it would need to be a roller lifter to make it work. Did a little bit of research here in OZ and seems it would be quite costly. Had a rough cost of $4500 AUS dollars and lot of trouble. The cam would be 1500 the balance taken up in the design by an engineer. 
> 
>Jim
>
>
>----- Original Message ----
>From: Jack W. Drews <vinttr4 at geneseo.net>
>To: Jim Cun <jimcun2001 at yahoo.com.au>; Friends of Triumph <fot at autox.team.net>
>Sent: Tuesday, 8 May, 2007 4:40:07 PM
>Subject: Re: [Fot] Roller life
>
>
>Looking at the profile of a roller cam, it looks like a flat lifter 
>will not work on a roller cam. The shape of the lobe is quite 
>different. The lobe shape on a roller cam is shaped kind of like a 
>figure "8" or mild hourglass, so if you use a flat lifter on it, the 
>lifter edges will dig into the flanks of the cam.
>
>At 05:20 PM 5/7/2007, Jim Cun wrote:
>  
>
>>G'day guys,
>>          Wanted to find out opinions on using solid lifters and a 
>>roller cam?
>>
>>Jim
>>
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>
>
>
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