Jim S.---Looks like we have agreed to disagree with the loss of pressure
(with the RR ratio increase)
Here are my thoughts. We know that the increase in the ratio will hold
both valves open longer during the overlap segment of the stroke, while
cranking. Now you have a time-against-pressure sequence that has
occurred, where I believe this could cause lower readings. I think the
key words here are at Cranking Speeds.
Do we still disagree? I'm willing to learn new things!
Dick
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From: "Jim Swarthout" <jswarth1@tampabay.rr.com>
To: <6pack@autox.team.net>
Subject: RE: Roller rockers continued
Date: Sun, 24 Nov 2002 17:23:09 -0500
Message-ID: <000001c29408$116758b0$6501a8c0@engineering>
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Reply-To: "Jim Swarthout" <jswarth1@tampabay.rr.com>
Mike,
I have been following along with the current posts regarding
this subject; I have been busy so I haven't been able to respond until
now! You should not have had any decrease in compression gauge reading
what-so-ever!
Rocker arms of a different ratio will NOT! Cause a decrease in the
static compression reading from a gauge. On the contrary, it would be
normal for the reading to be slightly higher!
Listers,
Thanks for all of your responses. For you additional information the
rockers are the Goodparts 1.55/1 ratio. My question really related to
the average of 30 PSI loss in compression and yes, with a nearly10/1
compression ratio I used to have from 193 to 204 PSI. I didn't expect
any noticeable difference in power just from the roller aspect of the
rockers but did think that the change in rocker ratio might improve
power slightly. I believe your responses have answered my question.
Overlap at idle reduces the compression somewhat because of the
increased rocker ratio.
Mike Lunsford, 1970 TR6
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