Andrews 21 with 10.25:1 - too much compression?
Thread Starter
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Outstanding HDF Member
Joined: Apr 2006
Posts: 2,555
Likes: 3
From: Clarksburg, PA
So I could still use my midrange cams but the headwork would bring the torque on lower?
Bike has plenty on top and I just assumed the only way to make torque was to change cams to move the powerband lower.
Bike has plenty on top and I just assumed the only way to make torque was to change cams to move the powerband lower.
Outstanding HDF Member
Joined: Jun 2008
Posts: 2,374
Likes: 5
From: redbank new Jersey
I think the head work would be good but it may not help u where u want. I would try that wood's tw6 that should give u the torque your after... And if u have the money port ur heads with the tw6
Thread Starter
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Outstanding HDF Member
Joined: Apr 2006
Posts: 2,555
Likes: 3
From: Clarksburg, PA
Well, in my frustration to stop the ticking, I cut out another set of stock pushrods and installed the adjustables again...things weren't working out.
I have ordered a set of Andrews 26hs due to the lower lift and cheap price and will be installing with stock pushrods.
Using the BigBoyz calculator with the 26 cams, corrected compression says 9.64:1 compared to the 37s with 4° advance at 9.67:1. I am assuming that means I will have no problems with hot starting and pinging on 93 octane since I have been running this setup.
I will ride it like this regardless of noises and whatever power delivery it has. Sometimes when you focus on things too long, it will drive you nuts.
Too many real problems need my time and money.
Thank You Both for taking the time to try and help me out! I appreciate it!
I have ordered a set of Andrews 26hs due to the lower lift and cheap price and will be installing with stock pushrods.
Using the BigBoyz calculator with the 26 cams, corrected compression says 9.64:1 compared to the 37s with 4° advance at 9.67:1. I am assuming that means I will have no problems with hot starting and pinging on 93 octane since I have been running this setup.
I will ride it like this regardless of noises and whatever power delivery it has. Sometimes when you focus on things too long, it will drive you nuts.
Too many real problems need my time and money.
Thank You Both for taking the time to try and help me out! I appreciate it!
Thread Starter
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Outstanding HDF Member
Joined: Apr 2006
Posts: 2,555
Likes: 3
From: Clarksburg, PA
I will definitely give an update...thanks again!
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Outstanding HDF Member
Joined: Jun 2008
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From: redbank new Jersey
Sounds good. I'm guessing it will feel similar to my bike I'm running 95inch 9.3.1compression with ported polished heads and andrews 21 cams..Its all low end grunt the bottom end is strong. 0-60 it rocks
Last edited by magnum629c; Jun 2, 2014 at 07:45 PM.
Thread Starter
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Outstanding HDF Member
Joined: Apr 2006
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From: Clarksburg, PA
Working on cam install and this bothers me.
It looks like the exhaust valve on front cylinder is lower than any others...is this possible?
What would it mean?
Front head:
Rear head:
It looks like the exhaust valve on front cylinder is lower than any others...is this possible?
What would it mean?
Front head:
Rear head:
