Cams & HC pistons, anybody done it - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 75 (permalink) Old 01-27-2011, 04:39 PM Thread Starter
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Cams & HC pistons, anybody done it

was thinking of getting a set like they have on here, anybody done this mod?
offer any tips?
was also wondering what kind of gains they would yield.

Lowering the tone since 1969
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post #2 of 75 (permalink) Old 01-27-2011, 05:40 PM
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11-1 seems high for unleaded pump gas. I'd check to make sure that's what he's specifying (91 Octane) you can get Hi-Octane (race fuel) from a pump too. I personally wouldn't go above 10.5-1 on unleaded (91 octane) pump fuel for detonation reasons. I've been toying with the idea from Pacific, just heard that their CS kinda sucks.

http://www.pacificcoaststar.com/pcs/...100_engine.htm

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...

Last edited by Fulltilt1; 01-27-2011 at 05:43 PM.
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post #3 of 75 (permalink) Old 01-28-2011, 10:25 AM
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Heard back from Shane at SS Cuctom Cycle. The HC Pistons and 502 Cams require 92 octane or above. Cylinder pressure of 190psi. I can only get 91 octane readily available (figured our way) you'd have to do the conversion for your gas over there. I guess you could always carry some octane boost in your pack and add a little when you need. Have the same question sent to PCS waiting on response.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
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post #4 of 75 (permalink) Old 01-28-2011, 10:40 AM
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SS Custom Cycle

Comments from Shane on their cams:

The SS-420 and SS-424 cams develop the same HP and TQ (significantly over stock cams), just in different parts of the RPM band
The SS-420 cam is a mild street grind designed to improve mid-range and top end power. They are for use with the stock pistons only.
The SS-424 cam is a mild street grind designed to improve low end to mid-range power band. They are for use with the stock pistons only.

The SS-502 and SS-580 cams are performance cams requiring different pistons and other changes
The SS-502 cam is a hot grind designed for street race applications. It requires HC pistons and should be combined with our standard bore 95mm 11.1 pistons or our 97mm 11.1 pistons. This kit, with SS Pro-Pipe yields 95,5 HP and 76.2 TQ (per Shane's Dyno sheets0.
The SS-580 cams are designed for 97mm bore race applications. They require that a minimum of 12.1 compression be used

More from SS web site:

Stock Cams: -- Average bike equipped with an air kit, drag pipes and Dyna.
Max HP range 58 to 63
Max TQ range 56 to 60
40 to 45 ftlb of TQ achieved by 2500 RPM
Average Max TQ carried from 3000 rpms to 4500 rpms

Standard 420 performance kit - Average bike equipped with cams, air kit, drag pipes and Dyna.

Our 420 cams are a great all purpose street & highway cam. Designed to work with the bikes stock pistons this cam grind offers great mid range and upper end power. The cams kick in at about 3500 RPMs and give you what feels to be endless power right to the rev limit. The way the power is distributed with this grind it's almost like adding an extra gear to the bike. Perfect for highway use.
Max HP range 70 to 75
Max TQ range 65 to 69
50 ftlb of TQ achieved by 3000
Average Max TQ carried from 4500 to 6000

424 Street Racer cams -- bike equipped with cams, air kit, drag pipes and Dyna.

Now if your looking to hot rod around town, this cam grind is for you. Let me tell ya what,...These cams can crack the whip for sure!! Our new 424 cam grind has awesome low end grunt, way better than stock and offer great mid-range power too. This grind also makes a nice change in the 1100's exhaust note as well...These babies thump...
Max HP 70 to 75
Max TQ 61 to 65
50 ftlb of TQ achieved by 2300 RPMs
Max TQ carried from 4500 RPMs 6000 RPMs

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
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post #5 of 75 (permalink) Old 01-28-2011, 10:43 AM
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Note the addition of a Dyna Ignition. Necessary to get all the performance benefits. I like that 95.5 HP and 76.2 TQ.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
Fulltilt1 is offline  
post #6 of 75 (permalink) Old 01-28-2011, 10:47 AM
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Just heard back from PCS 18 minutes, so much for sucky CS.

GW,

Our pistons are designed to run with 91 octane fuel and designed to be run as daily driver. If you have 93 octane fuel available, you could run it and advance the timing with your dyna ignition module for added performance. We do not offer compression setups on our web site for “general purchase” that would not fit those conditions.

Let us know if you have any more questions.

Sent a response asking about their numbers.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
Fulltilt1 is offline  
post #7 of 75 (permalink) Old 01-28-2011, 10:47 AM
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Quote:
Originally Posted by Flush You Bastard View Post
was thinking of getting a set like they have on here, anybody done this mod?
offer any tips?
was also wondering what kind of gains they would yield.
You do not need the pistons, I ran the 420 cams with the BAK and PCS monster pro pipes and there is no comparison to stock,you do not need a programer the stock works great and the MPG is a little better.
Jim
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post #8 of 75 (permalink) Old 01-28-2011, 12:19 PM Thread Starter
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thanks for all the info guys. i realise the danger of knocking as i'd only be using pump gas (probably about 63 octane over here!!). so those PCS ones look good, but which would you go for, 10.6 or 10.25 when running standard issue gas?
i'd get the best cams they have though, may as well when i'm at it.
i'd say the ignition is only required if you want to advance the timing.
the real reason i wanted to do this is because i'll be doing it for sure on my next bike, so wanted to have a go at it now too to learn more.

Lowering the tone since 1969
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post #9 of 75 (permalink) Old 01-28-2011, 02:35 PM
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Response from PCS:
Well, the Cobra’s are not the best performers, but they will do pretty good. You should see top end numbers in the mid/upper 70’s. But mostly you will see your power band move into the lower rpm range much sooner.



It’s common for people to think of top hp numbers, but where the real advantage comes from is the hp gain in the lower rpm power band. For example a stock engine at 4000 rpm, you would see app 38-40 hp with our full package installed the kit installed 55 hp. That’s an increase of about 15-17 hp at that rpm. So the whole power band shifts in much quicker. Max power, as most people often ask, is at app 6000 rpm, and let’s face it, we don’t do much actual driving at that rpm. So with the cams and pistons installed you will really feel it as you pull away from a stop, or as you twist the throttle to pass someone.

I'm gonna ask for dyno sheets.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
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post #10 of 75 (permalink) Old 01-28-2011, 03:29 PM
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SS Customs Reply to Dyno Sheet.

There's one right on the site, full 502 with 39 carbs and our Pro-pipe..

http://www.sscustomcycle.com/products/engine/

The basic 502 kits with stock carbs turns between 80 - 85 HP, 85 - 90 HP with the addition of my Pro-pipe... And low to mid 90's when ya add the 39mm carbs

Thanks!
Shane

From PCS:
The dyno’s we have are on our web site. We don’t have dynos for every possible combination.

http://www.pacificcoaststar.com/pcs/..._1100_dyno.htm

Very similar results.

Both Cam sets, for the HC Pistons, require doubled up Valve springs. The .502SS and the "Z" PCS. I'm probably lookin at the 10.6:1 and the XXX/2 from PCS. SS doesn't have a milder grind for use with the 11:1's so the double springs are required particularly for high RPM. That's not where I ride, I want much more grunt off line. You'll get much more out of the mods by adding the dyna and advancing the timing curve.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...

Last edited by Fulltilt1; 01-28-2011 at 04:21 PM.
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