torque dip? dyno sheet (pic)
1. is the cam
Sele cting a Camshaft
The intake closing point relative to bottom center listed in
the table can be used as a general indicator for the shape of
the torque curve. Earlier intake closing values will result in
higher torque at low engine speeds (along with lower
horsepower at higher engine speeds). Later intake values
will result in higher horsepower at high engine speeds
(along with lower torque at low engine speeds).
Intake Closing
(deg ABDC)
The intake closing point relative to bottom center listed in
the table can be used as a general indicator for the shape of
the torque curve. Earlier intake closing values will result in
higher torque at low engine speeds (along with lower
horsepower at higher engine speeds). Later intake values
will result in higher horsepower at high engine speeds
(along with lower torque at low engine speeds).
Intake Closing
(deg ABDC)
Less
Early intake closing indicates a
than 30°
low speed torque cam.
30° – 50°
M edium intake closing indicates a
mid-range torque cam.
Greater
Late intake closing indicates a
than 50°
high speed power cam.
Intake closing values are just one indicator of the shape of
the torque curve. Camshaft lift and duration along with the
cylinder head‘s port size and flow, engine displacement,
compression ratio, and throttle size also play a roll in the
shape of the torque curve. Harleys words right out of the book
the torque curve. Camshaft lift and duration along with the
cylinder head‘s port size and flow, engine displacement,
compression ratio, and throttle size also play a roll in the
shape of the torque curve. Harleys words right out of the book
SE-260 CAM KIT*
This cam is designed around large displacement and high
RPM engines. This cam should be used with high compression,
performance heads, and open intake and exhaust. This
cam is used in the 103" and larger Stage 4 Race Kits. It has
the lift and duration necessary to take advantage of the 110+
and CNC ported heads.
This cam is designed around large displacement and high
RPM engines. This cam should be used with high compression,
performance heads, and open intake and exhaust. This
cam is used in the 103" and larger Stage 4 Race Kits. It has
the lift and duration necessary to take advantage of the 110+
and CNC ported heads.
For race application only.
25122-02
Harleys words....right out of the book
25122-02
Harleys words....right out of the book
.609"/.609"
263˚/269˚ Intake: 28˚ BTDC/55˚ ABDC 0.236"/.213"
25475-06
Exhaust: 65˚ BBDC/24˚ ATDC
2. are the pipes
This would be a great cam for a super charger......
2. are the pipes
This would be a great cam for a super charger......
Thread Starter
|
Outstanding HDF Member
Joined: Sep 2008
Posts: 2,408
Likes: 1
From: pottsville,pa
The cam is coming on where I want the power to be, this is a dyna and not a bagger, so the power doesn't have to be down low. I figured that the pipes were the culprit and I just can't bring myself to switch over to a 2-1 just yet. I can't feel this dip, but after seeing it on paper, was wondering what was causing it.
Outstanding HDF Member
Joined: Sep 2007
Posts: 3,352
Likes: 4
From: Augusta, GA
The cam is coming on where I want the power to be, this is a dyna and not a bagger, so the power doesn't have to be down low. I figured that the pipes were the culprit and I just can't bring myself to switch over to a 2-1 just yet. I can't feel this dip, but after seeing it on paper, was wondering what was causing it.
As you say, I can't feel the dip because it revs through it so fast you wouldn't know it was there.
Rock on.
'06 Street Bob
Tourer
Joined: Mar 2007
Posts: 431
Likes: 0
haven't seen many dynos with that cam, and also feel that it's kinda big for your application...the stock throttle body cannot flow enough air for those cams...i would use a smaller cam and the results would be a lot more torque below 3500 rpm and about the same horsepower
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