[Fot] Roller life

[Bill Babcock]

You won't see a huge increase in power from adding a roller cam. I  
don't remember what engine you're using, but the increase in flow  
created by having longer duration enabled by the steep lifting ramp  
is never more than a few  percent. If you've optimized everything  
else and have no where else to go for another little boost then  
roller cams make sense, but otherwise they're a lot of hassle. The  
lifters wind up being pretty heavy too because they need a stabilizer  
bar between lifter sets to keep them from rotating. I've seen a lot  
of installations go bad when the cam grinds away at the head too--you  
have to control the cam thrust very carefully because it varies  
constantly--the cams hammer back and forth because there's no ramp on  
the cam faces--they have to be flat.

Bill Babcock
billb at bnj.com
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On May 8, 2007, at 2:14 AM, 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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