[DeTomaso] Crane cam 520341

[Göran Malmberg]

>From a performance-function standpoint we might decide one LSA, but as we
seen here the car do have a exhaust system that for some reason is to be 
keept
on the car and therefore the LSA will get another number.
In my own case I am using a little more cam than what we speak of here, some
265 at 050. . This will by nature make for a  more overlap even if 110 LSA.
My first cam was 106 LSA and the idle soot number turned 2500 ppm! Not
very funny even if the cam dorwe nice.It also played som havoc with the carb
idle system (this was 1996 when I used a carb). So I bought a new cam having
the same duration but 110 LSA giving some better numbers. Ok, the injection
is handling these things much better, but on the other hand som sacrifice in
low end Tq dosent matter if the engine is big, it is only at high speed 
traction
is enough.
There is a row of circumstances other than plain engine efficency numbers on
a dyno that enter the picture, depending on what type of engine in what type 
of
a car it is mounted in, that becomes important when selecting a cam.
Goran


--- Original Message ----- 
From: "Charles Engles" <cengles at cox.net>
To: "Daniel C Jones" <daniel.c.jones2 at gmail.com>
Cc: <detomaso at realbig.com>
Sent: Wednesday, November 19, 2008 12:35 AM
Subject: Re: [DeTomaso] Crane cam 520341


> Dear Dan,
>
>
>              I am dazzled by your comments and recommendations for exhaust
> systems and cams in relation to each other.    Based on your
> recommendations, then the more stock or restrictive the exhaust system, 
> the
> more the LSA should tend toward 110.   Conversely, the more the exhaust
> system approaches open headers, then an LSA close to 105 is better.
>
>             Dumb question:  is there a reference for this?   It is very
> interesting.
>
>
>
>                           Warmest regards,  Chuck Engles
>
>
>
>
>
> ----- Original Message ----- 
> From: "Daniel C Jones" <daniel.c.jones2 at gmail.com>
> To: "DeTomaso Forum" <detomaso at realbig.com>
> Sent: Tuesday, November 18, 2008 12:33 PM
> Subject: Re: [DeTomaso] Crane cam 520341
>
>
>> If you stay with restrictive exhaust, don't run 106 LSA.
>> 108 or 109 would be better.
>>
>> Dan Jones
>>
>>
>> On Mon, Nov 17, 2008 at 8:19 PM, Barry Seib <oldwheel at mts.net> wrote:
>>> Daniel C Jones wrote:
>>> What is your compression ratio?
>>>> 10.5 :1
>>> What sort of exhaust do you have?
>>>> Stock at present. Considering changes.
>>> With 106 degrees LSA, you need a really efficient exhaust.  The
>>> mufflers in particular need to have very little backpressure.
>>>> I 'd be a little reluctant to get too loud with the mufflers (for long
>>> trips).
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