Cams (was Re: Oodles of free time ?)

[MHLIGGINS@aol.com]

In a message dated 9/21/98 6:15:23 PM Central Daylight Time,
ejfluhr@austin.ibm.com writes:

<< I thought we had come to the conclusion that the MC turbo cam was
 identical to the NG/NF (2.3L) naturally aspirated cam, and that the turbo
 cams were a good upgrade to the earlier naturally aspirated engines
 (i.e. Coupe, 4Kq, 5K non-turbo). 
 
 Later,
 Eric >>

	My comments were based on the following posts from Scott J. and Bruce Bell,
plus some other comments I remembered (or thought I remembered).  Having
looked through my notes, I apparently mis-quoted Ned Ritchie.  He commented on
using the turbo cam in his wife's Synchro.  Sorry about that.  I also have the
Bruce B. post referenced by Scott.  E-mail me if you can't find it in the
archives.

	--ml


<<*  Ned:  Yes the 130hp N/A cam is the same as the turbo cam, or vice versa
more specifically, and the turbo cam has the lobe for the vacuum pump even.
*  Most of the thread deals with "turbo" cams in "N/A" motors, in actuality,
it's the other way around, most turbo cams, even performance ones are rooted
in the N/A family tree.  The schrick 268/272/276 are all N/A cams, so is the
ABT 300 (anderson/ex-Lawson), and yes it pulsates the CIS flap.  The Schrick
272 has the highest lift of the 3 common above, and is a good turbo cam, btdt.
*  On the 10vt motor, the cam is really where the tweeksters should spend some
time/dollars.  If one reads up on what some of the tuners did in the 80's, the
cam development was limited, but very successful.
*  Bruce Bell did a very good job of explaining the differences in cams N/A vs
turbo,  a good archive reference.  I have also seen his charted cam comparos
on his 4kq, and the difference was measureable.
*  Avoid the press on lobe type cams, several stories of problems, really
expensive ones at that.
*  High lift, little overlap for turbo cars is the ticket.  Really high lift?
Those mechanical valve heads may not be sea anchors after all....

My .02

Scott Justusson
'87 5ktqw
'86 5ktqw
'84 Urq

Date: Tue, 2 Dec 1997 20:22:02 -0700
From: "Bruce Bell" <bbell@bbell.com>
Subject: Re: Turbo cam in NA I5

> From: Greg East <gregeast@frii.com>
> To: quattro@coimbra.ans.net
> Subject: Turbo cam in NA I5
> Date: Tuesday, December 02, 1997 5:21 AM
> 
> Anyone care to share their real world experience with
using a turbo cam in
> a NA I5? ('86 4kcsq in my case)

Why?

Turbo cams generally have a very short overlap. While good
for turbos in general and very low end response in an NA,
not the hot ticket for an NA motor.>>