Would someone explain to me the throttle body "cam"?
11-16-2007, 09:49 AM
#1
Launching!
Thread Starter
iTrader: (1)
Join Date: Sep 2007
Posts: 207
Likes: 0
Received 0 Likes
on
0 Posts
Would someone explain to me the throttle body "cam"? I have read about a throttle body cam causing the throttle body to open up slower?
The earlier ls1's opened up quicker and the later opened up slower, right?
Anyone got a picture?
What is the advantage of each? How does it work?
Sorry for the newb like questions
The earlier ls1's opened up quicker and the later opened up slower, right?
Anyone got a picture?
What is the advantage of each? How does it work?
Sorry for the newb like questions
11-16-2007, 11:52 AM
#2
TECH Resident
iTrader: (2)
Join Date: Sep 2004
Location: Cleveland, Oh
Posts: 810
Likes: 0
Received 0 Likes
on
0 Posts
Basically if you look at the TB on the left you'll see where the throttle cable attaches. That is called the TB cam. If it is smaller (like on the older models) it moves quicker than the larger TB cam's of today.
11-16-2007, 04:57 PM
#6
Launching!
Thread Starter
iTrader: (1)
Join Date: Sep 2007
Posts: 207
Likes: 0
Received 0 Likes
on
0 Posts
slowbrakiller - Do you mind expounding?
Is the "cam" the same as a cable that pulls it open and closed?
Rather than posting things like :banghead:,, how about give me a little insight
Is the "cam" the same as a cable that pulls it open and closed?
Rather than posting things like :banghead:,
, how about give me a little insight 
Trending Topics
02-21-2008, 09:06 PM
#11
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
I have been looking at this. What I see is, the early "cam"
(aka pulley) is a uniform round one and the later is more like
a Nautilus machine. The early gives you the same blade
angle per cable draw throughout the travel. The late one,
requires more draw per angle in the early stage and goes
down to a smaller radius, more angle per draw, at the big
end. So you feel less "throttle response" and the low end
is more "controlled". They should end at roughly the same
point regardless (open is open) but on my car I found the
TCS cluster was limiting the pedal draw and I was barely
able to get full open on a stock TB and short of full open
on my new Pro Products 85mm. So I modified the pulley
with a new hole closer to the edge & cable ball making it
open more with less cable draw.
I prefer the old style, myself.
(aka pulley) is a uniform round one and the later is more like
a Nautilus machine. The early gives you the same blade
angle per cable draw throughout the travel. The late one,
requires more draw per angle in the early stage and goes
down to a smaller radius, more angle per draw, at the big
end. So you feel less "throttle response" and the low end
is more "controlled". They should end at roughly the same
point regardless (open is open) but on my car I found the
TCS cluster was limiting the pedal draw and I was barely
able to get full open on a stock TB and short of full open
on my new Pro Products 85mm. So I modified the pulley
with a new hole closer to the edge & cable ball making it
open more with less cable draw.
I prefer the old style, myself.
Last edited by jimmyblue; 02-22-2008 at 08:46 AM.
02-22-2008, 10:30 AM
#16
TECH Addict
iTrader: (41)
Join Date: Feb 2006
Location: Germantown Hills IL
Posts: 2,003
Likes: 0
Received 0 Likes
on
0 Posts
the springs for these two cams are also different,,,also,,a truck cam is just like the 98/99 cam, but witha bigger wing on it...same swing, bigger wing
02-22-2008, 01:10 PM
#20
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
My PP 85mm came with both sizes in the box, attach
with a nut. The stock TB shaft has the pulley swaged
on and you have to swap the whole shaft assembly.
Easy enough, though if someone before you has staked
the blade screws you'd have some grinding to do.
with a nut. The stock TB shaft has the pulley swaged
on and you have to swap the whole shaft assembly.
Easy enough, though if someone before you has staked
the blade screws you'd have some grinding to do.