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Re: [Tigers] Roller 289

To: "Tony Somebody" <achd73@yahoo.com>, <tigers@autox.team.net>,
Subject: Re: [Tigers] Roller 289
From: "Smit, Theo" <Theo.Smit@dynastream.com>
Date: Tue, 18 Aug 2009 12:03:11 -0600
Hi Tony,
You shouldn't use a roller lifter with a non-roller cam because (besides
the cam hardness issue) the cam lobe profile is totally different. A
flat tappet cam is designed to push a flat surface up at the right rate,
while a roller cam is designed to work against a radiused surface and
still achieve a comparable lift profile to what was originally obtained
with the flat tappet interface.

If you compare a roller cam lobe to a flat tappet cam lobe, you'll see
that the roller cam tip is a lot more rounded compared to the flat
tappet cam, even though the lift-at-the-valve profile might be quite
similar.

Cheers,
Theo



> -----Original Message-----
> From: tigers-bounces@autox.team.net
> [mailto:tigers-bounces@autox.team.net] On Behalf Of Tony Somebody
> Sent: August 18, 2009 11:34 AM
> To: tigers@autox.team.net; Jeffrey Nichols
> Subject: Re: [Tigers] Roller 289
>
<snip>
> requiring change if used with a roller cam. Is there a
> problem using roller lifters with a non roller cam because of
> the hardness-like w/ the dist. gear.
> TtT
> _______________________________________________
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