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@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@geneseo.net>
> To: Jim Cun <jimcun2001@yahoo.com.au>; Friends of Triumph
> <fot@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
>>
>> Send instant messages to your online friends http://
>> au.messenger.yahoo.com
>> _______________________________________________
>> vinttr4@geneseo.net
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>
>
>
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