Gear Cam Question And Exhaust Sound
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Road Captain
Joined: Jun 2009
Posts: 659
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From: Central Ohio
Gear Cam Question And Exhaust Sound
Does one gear driven cam produce more rumble and sound from your motor/exhaust than another? I am going to have a gear driven set of cams installed in an 88" motor and head work down the road. Also will do lifters and pushrods. Maybe a oil pump. Looking at the Andrews cams and want to produce the most Harley rumble as possible. Is there a difference in 21g vs. 37g for example. Looking at http://www.bigboyzcycles.com/tccams.htm helps compare the specs, but I am not an indy. Would lift or duration have anything do do with it? Also wanting low and mid range torque with a bump in hp.
Banned
Joined: Sep 2009
Posts: 7,580
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From: The Internet (& Dyer, Indiana)
The SE204's are cams that produce the prettiest exhaust note I have ever heard on an 88/95 motor. They have 8 degree's of advance built in with an early exhaust close. Sweet sounding exhaust.
But they don't come in gear drive.
But they don't come in gear drive.
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Road Captain
Joined: Jun 2009
Posts: 659
Likes: 2
From: Central Ohio
Thanks for the reply! With that Big Boyz link I posted, you can compare specs on the cams. It seems the Andrews 21g may be comparable to the SE 204. I recall reading in a thread someone comparing the two as similar.
Sponsor
Joined: Dec 2007
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Does one gear driven cam produce more rumble and sound from your motor/exhaust than another? I am going to have a gear driven set of cams installed in an 88" motor and head work down the road. Also will do lifters and pushrods. Maybe a oil pump. Looking at the Andrews cams and want to produce the most Harley rumble as possible. Is there a difference in 21g vs. 37g for example. Looking at http://www.bigboyzcycles.com/tccams.htm helps compare the specs, but I am not an indy. Would lift or duration have anything do do with it? Also wanting low and mid range torque with a bump in hp.
You'd really want that compression to come up to about 9.2-4, to be fully effective.
Scott
Road Warrior
Joined: Jun 2010
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From: Boston
was just reading on a forum that if your going with the 204 cams make sure they are gear driven. But you say this in your post that you are using gear driven, so should be a problem.
It said that chain driven cams would most likely have a tensioner problem along the lines somewhere. just an FYI
It said that chain driven cams would most likely have a tensioner problem along the lines somewhere. just an FYI
HDF Community Team
Joined: Jun 2006
Posts: 12,773
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From: san antonio
was just reading on a forum that if your going with the 204 cams make sure they are gear driven. But you say this in your post that you are using gear driven, so should be a problem.
It said that chain driven cams would most likely have a tensioner problem along the lines somewhere. just an FYI
It said that chain driven cams would most likely have a tensioner problem along the lines somewhere. just an FYI
Road Warrior
Joined: Dec 2008
Posts: 1,733
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From: Linden, NC
Last edited by Weevil; Mar 5, 2011 at 08:29 AM.
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Tourer
Joined: Dec 2007
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From:
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Scott's got it right. Mines at 9.3/1 with gear drive 21's. Nice combo!
Scott's got it right. Mines at 9.3/1 with gear drive 21's. Nice combo!
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