Is this right?
Thread Starter
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Cruiser
Joined: May 2009
Posts: 120
Likes: 1
From: Calgary, Alberta, Canada
Is this right?
I am doing some work to the 2011 Road Glide custom 103". I'll lay it out for you guys, please let me know if my math is right. I am at, and do most of my riding at or above 3500'. Bikerboyz calc puts me at 187 crank comp (at this elev)
Andrewa 54H cams = 0.020 smaller cam base lobe than stock
Jims power glide II lifters set @ 0.100 (0.200 travel) vs stock lifter set @ 0.085 (0.175 travel) = 0.015 differance.
Stock heads ported polished, decked 0.015
0.040 head gasket vs 0.045 stock = 0.005 differance
I want to use non adjustable push rods, as I have had a bad expieriance with broken nut on an adjustable once......and never want that again.
Stock rod lenth + 20 tho for cam diff.
+ 15 tho for lifter diff.
= 0.035 longer
- 15 tho head deck
- 5 tho gasket diff
= 0.020 shorter
0.035 longer
-0.020 shorter
= 0.015 longer push rods req'd
Is this correct???????
Any and all welcome.....thanks
Andrewa 54H cams = 0.020 smaller cam base lobe than stock
Jims power glide II lifters set @ 0.100 (0.200 travel) vs stock lifter set @ 0.085 (0.175 travel) = 0.015 differance.
Stock heads ported polished, decked 0.015
0.040 head gasket vs 0.045 stock = 0.005 differance
I want to use non adjustable push rods, as I have had a bad expieriance with broken nut on an adjustable once......and never want that again.
Stock rod lenth + 20 tho for cam diff.
+ 15 tho for lifter diff.
= 0.035 longer
- 15 tho head deck
- 5 tho gasket diff
= 0.020 shorter
0.035 longer
-0.020 shorter
= 0.015 longer push rods req'd
Is this correct???????
Any and all welcome.....thanks
Seasoned HDF Member
Joined: Jun 2006
Posts: 28,523
Likes: 3,953
From: Vermont
Thread Starter
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Cruiser
Joined: May 2009
Posts: 120
Likes: 1
From: Calgary, Alberta, Canada
The new lifters bottom out at 0.200, stock are 0.170
You have to set the rods down into the new lifters an additional 0.015......this would "shorten" the rods, no??????
I'm not being a smart ***.........I'm asking
Thanks for the replies
You have to set the rods down into the new lifters an additional 0.015......this would "shorten" the rods, no??????
I'm not being a smart ***.........I'm asking
Thanks for the replies
Road Captain
Joined: Aug 2011
Posts: 538
Likes: 3
From: Florida
Stock rod lenth + 20 tho for cam diff.
+ 15 tho for lifter diff.
= 0.035 longer
If your cam got .20 shorter and the lifters are .15 taller, that means only .005 longer pushrods req'd
- 15 tho head deck
- 5 tho gasket diff
= 0.020 shorter
This looks correct
0.005 longer
-0.020 shorter
= 0.015 shorter push rods req'd
Any and all welcome.....thanks
+ 15 tho for lifter diff.
= 0.035 longer
If your cam got .20 shorter and the lifters are .15 taller, that means only .005 longer pushrods req'd
- 15 tho head deck
- 5 tho gasket diff
= 0.020 shorter
This looks correct
0.005 longer
-0.020 shorter
= 0.015 shorter push rods req'd
Any and all welcome.....thanks
Tourer
Joined: Dec 2010
Posts: 460
Likes: 1
From: Frisco TX
Odds are your pistons are going to be slightly down in the cylinder. The Big Boyz calculators assume 0 deck. Use a .030 cometic headgasket to make up the compression and you will be within .005 and not need longer pushrods. You will need to check for valve to piston clearance after doing all of these mods.
Last edited by Energy-Dude; Dec 7, 2012 at 10:38 AM.
Thread Starter
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Cruiser
Joined: May 2009
Posts: 120
Likes: 1
From: Calgary, Alberta, Canada
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HDF Community Team
Joined: Jun 2006
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From: san antonio
See my post in the Engine section. Where did you get the .175" OEM lifter travel? OEM lifter travel; all TC lifters AFAIK, have .200" of travel, give or take a few thousandths due to manufacturing/maching tolerances. Lifter travel is not part of the equation. You are also using the full difference in the base circle dimensions and you should only be using half. If you insist on perfect fit pushrods, you would need pushrods that are .010" shorter but .010" is well within the ability of the lifter to accomodate. The stock pushrods will work fine.
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Thread Starter
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Cruiser
Joined: May 2009
Posts: 120
Likes: 1
From: Calgary, Alberta, Canada
See my post in the Engine section. Where did you get the .175" OEM lifter travel? OEM lifter travel; all TC lifters AFAIK, have .200" of travel, give or take a few thousandths due to manufacturing/maching tolerances. Lifter travel is not part of the equation. You are also using the full difference in the base circle dimensions and you should only be using half. If you insist on perfect fit pushrods, you would need pushrods that are .010" shorter but .010" is well within the ability of the lifter to accomodate. The stock pushrods will work fine.
I have read your other post, thanks for the help
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