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Author Topic: Which ways better to achieve compression  (Read 2445 times)

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cvo1717

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Which ways better to achieve compression
« on: February 18, 2012, 04:03:27 PM »
What will work better using the stock head and changing the piston or milling the head and leaving the stock piston?Basically which way makes makes more power using the tw777 woods cam milling and porting the heads or using the stock heads and changing to a high comp. piston?
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Mike
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HUBBARD

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Re: Which ways better to achieve compression
« Reply #1 on: February 18, 2012, 08:00:24 PM »
What's the budget?  :nixweiss: Later--HUBBARD
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cvo1717

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Re: Which ways better to achieve compression
« Reply #2 on: February 18, 2012, 09:21:31 PM »
 Around $3000
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
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HD Street Performance

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Re: Which ways better to achieve compression
« Reply #3 on: February 18, 2012, 10:41:48 PM »
The answer would depend on the cam choice.
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MadCVORG

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Re: Which ways better to achieve compression
« Reply #4 on: February 19, 2012, 01:17:58 AM »
My bike is being modified now, with 10.5 pistons.  I figured it's easier to replace a piston than it is to 'un-mill' a head.
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barefoot3zk5

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Re: Which ways better to achieve compression
« Reply #5 on: February 19, 2012, 12:11:32 PM »
Quote from: Deweysheads on February 18, 2012, 10:41:48 PM
The answer would depend on the cam choice.
Dewey.. Perhaps you will elaborate ??
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cvo1717

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Re: Which ways better to achieve compression
« Reply #6 on: February 19, 2012, 12:26:04 PM »
The cam will most likely be a woods TW-777.
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
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Re: Which ways better to achieve compression
« Reply #7 on: February 19, 2012, 01:10:39 PM »
Whoever ports the heads will know what to do. The 110 is not the same animal as a bath tub chamber and needs a little different treatment IME.
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barefoot3zk5

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    • CVO1: 2011 FLHXSEII Dragula 2/1 exh.. Performance Mach airbox..Metalsports 26" front wheel w/6piston singleside brake 13" rotor and matched 18" rear 200 tire..TTS tuner by DOC .. Woods cams and Hi comp pistons.. 600 LEDs hidden PLUS, SONY head unit and gauges all green LEDs to match,500watt ARC amp w/4 Focal6.5 spkrs,Install by Peter @SOUNDZ .. Yafee tag frame . chrome inner/outer primary. greeen gator seat/backrest ..major engine mods 125+ HP and powder coated heads/cyl and diamond cut. homemade rear air suspension
Re: Which ways better to achieve compression
« Reply #8 on: February 19, 2012, 01:42:14 PM »
Geez Dewey .. could ya over simplfy a lil bit  ???  :nixweiss:
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cvo1717

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Re: Which ways better to achieve compression
« Reply #9 on: February 19, 2012, 02:42:16 PM »
What does that mean port heads or change piston ,do not want to do both which way can give me most power safely
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
130 HP  134 TQ STD
126 hp   131 TQ SAE

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Re: Which ways better to achieve compression
« Reply #10 on: February 19, 2012, 06:12:18 PM »
If I was targeting 10.5/1 I would use pistons
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cvo1717

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Re: Which ways better to achieve compression
« Reply #11 on: February 19, 2012, 08:37:25 PM »
So if i change the piston and leave the head stock i will make more power than if i do head work and leave the piston stock?
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
130 HP  134 TQ STD
126 hp   131 TQ SAE

Smitty2u

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Re: Which ways better to achieve compression
« Reply #12 on: February 19, 2012, 09:10:48 PM »
Compression and porting heads are two of many pieces of the puzzle in a performance upgrade.  I found a good read, which helped me to understand how the pieces influenced torque and horsepower.  I was able to read it online without even having to buy the book.  The book is named "How To Build A Harley-Davidson Torque Monster".  
Here's the actual link...
http://www.amazon.com/Harley-Davidson-Torque-Monster-Motorbooks-Workshop/dp/0760329117/ref=cm_cr_pr_product_top
Click on the picture of the book and it will open in it's entirety.

Good Luck!

Smitty
« Last Edit: February 19, 2012, 09:15:08 PM by Smitty2u »
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cvo1717

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Re: Which ways better to achieve compression
« Reply #13 on: February 19, 2012, 09:22:46 PM »
thanks will read
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
130 HP  134 TQ STD
126 hp   131 TQ SAE

ob1

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Re: Which ways better to achieve compression
« Reply #14 on: February 19, 2012, 09:52:08 PM »
Pretty Good read, Thanks.
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Z10

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Re: Which ways better to achieve compression
« Reply #15 on: February 20, 2012, 07:26:19 AM »
I was faced with the same decision after deciding to go with the Woods 555.  Did not want to change the pistion. After talking to Scott at Hillside Cycle I decided to pull the heads and send them to him to be cc'd.  My goal was 10 to 1. Not sure he could have gotten me 10.5 to 1 just by milling the heads. By sending them to Scott I  know the CC was before and after. I also had him install compression releases. If you go with a piston change and achieve 10.5 to 1 you may want to consider releases.

Should be firing mine up for the first time today...
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cvo1717

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Re: Which ways better to achieve compression
« Reply #16 on: February 20, 2012, 12:06:56 PM »
The bike has auto comp  releases stock thanks
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Mike
2013 CVO BREAKOUT 117 KIT
ROSAS HEADS WOODS TW 8-6 CAM
RB RACING 2 INTO 1 PROSTOCK CHALLENGE PIPE
130 HP  134 TQ STD
126 hp   131 TQ SAE
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