Timing Key Tech - HCS Snowmobile Forums

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Old 12-03-2010, 02:27 PM   #1 (permalink)
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Default Timing Key Tech

When your on the quest for HP, timing keys always seam to come up in the conversation, You hear lots of talk saying they make HP and that you need higher octane fuel to run them buy not a lot of people know why.
A timing key simply advances your timing using a offset key in place of the straight cut key between the flywheel and crank. While looking at the motor from the right side the flywheel will be advanced clockwise causing your spark plugs to fire earlier, example: 2* timing key will advance the flywheel 2* clockwise and cause the plugs to fire 2* early. See Pic
But why does it make power?
Timing Theory:
On the compression stroke as the spark plug fires, It takes a few milliseconds for fuel to ignite and burn/expand and create enough pressure to push the piston down (making power) therefore if you were to set timing at 0* at top dead center (TDC), by the time the fuel ignited and expanded the piston would be half way down the bore and the motor wouldn't make any power. Stock F7 timing is set at 14* before top dead center (BTDC), This tells us that Cat/Suzuki engineers figured that it take 14* of crank rotation for 87 octane fuel to ignite/expand and get max pressure just after the piston passes top dead center (If ignites/expands to early, the fuel is expanding before or at TDC you get "spark knock" or detonation) Cat didn't max out the timing because of unknown variables like fuel quality and trail conditions. So when you add 2* of timing you move the point at which the fuel ignites and starts making max pressure closer to TDC making use of all the fuel and making max HP. 93 octane fuel burns slower than 87 so you can add even more timing making even more power.

If you don’t mind running good fuel, Timing is your best friend.


(Timing key pic is from Nick on Arctic Chat)
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Old 08-29-2019, 02:48 PM   #2 (permalink)
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Default 17 zr8000

Have a stock 17 zr8000 and run premium fuel and looking to get rid of this little hesitation when starting off...really noticeable when breaking trail and tends to clear up after 10mph. I was told a timing key would make help but not sure which one to order. Any experience or help with this would be awesome
Thanks
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Old 12-03-2019, 09:24 AM   #3 (permalink)
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So you have been riding sleds since you were -7 years old?
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Old 02-21-2020, 10:50 PM   #4 (permalink)
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Originally Posted by Twinrats496 View Post
So you have been riding sleds since you were -7 years old?
Yup Both of them ,
CJ=age 34
riding since 1985, 35 years ago; he was -1 when he started

Chad = age 37
riding since 1976, 44 years ago; he was -7 when he started

How do they keep little cells and eggs on the seat when it's so cold

Last edited by Szledhead; 02-21-2020 at 10:54 PM.
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Old 03-01-2020, 12:48 PM   #5 (permalink)
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Question

Quote:
Originally Posted by CJ7Jeepoffroad View Post
When your on the quest for HP, timing keys always seam to come up in the conversation.
You hear lots of talk saying they make HP and that you need higher octane fuel to run them buy not a lot of people know why.


A timing key simply advances your timing using a offset key in place of the straight cut key between the flywheel and crank.
While looking at the motor from the right side the flywheel will be advanced clockwise causing your spark plugs to fire earlier,
Example:
2° timing key will advance the flywheel 2° clockwise and cause the plugs to fire 2°
earlier.

But why does it make power ?
Timing Theory:
On the compression stroke as the spark plug fires, It takes a few milliseconds for fuel to ignite and burn/expand
and create enough pressure to push the piston down (making power) therefore if you were to set timing at 0° at top dead center (TDC),
by the time the fuel ignited and expanded the piston would be half way down the bore and the motor wouldn't make any power.
Stock F7 timing is set at 14° before top dead center (BTDC),
This tells us that Suzuki engineers figured that it take 14° of crank rotation for 87 octane fuel to ignite/expand and get max pressure just after the piston passes top dead center.
(If ignites/expands to early, the fuel is expanding before or at TDC you get "spark knock" or "detonation" )
Suzuki didn't max out the timing because of unknown variables like fuel quality and trail conditions.
So when you add 2° of timing you move the point at which the fuel ignites and starts making max pressure closer to TDC making use of all the fuel and making max HP.
93 octane fuel burns slower than 87 octane so you can add even more timing making even more power.

If you don’t mind running good fuel, Timing is your best friend.
Speedwerx Offset Timing keys for EFI models are available in:
* 1.5°
* 2.5°
* 3.5°

I can only get 91 AKI/Octane.
Is it safe to put a 2,5° timing key to the laydown 500 cc engine ?



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Last edited by lasse; 03-03-2020 at 02:01 PM.
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Old 03-12-2020, 01:47 PM   #6 (permalink)
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Quote:
Originally Posted by Szledhead View Post
Yup Both of them ,
CJ=age 34
riding since 1985, 35 years ago; he was -1 when he started

Chad = age 37
riding since 1976, 44 years ago; he was -7 when he started

How do they keep little cells and eggs on the seat when it's so cold
Actually I’m 40, not sure why the age isn’t updating, I do wish I was 34 again lol.
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Old 03-12-2020, 01:51 PM   #7 (permalink)
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Default

Quote:
Originally Posted by lasse View Post
Speedwerx Offset Timing keys for EFI models are available in:
* 1.5°
* 2.5°
* 3.5°

I can only get 91 AKI/Octane.
Is it safe to put a 2,5° timing key to the laydown 500 cc engine ?


.
Wow, you are digging up bones with this post, I haven’t been on here for years.
I would run a 2.5 key in the 500cc but with good fuel and clutching. I’ve only tried keys in the 2010 500 snopro ant it took it fine. Use at your own risk though
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Old 03-12-2020, 02:15 PM   #8 (permalink)
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Question

Quote:
Originally Posted by CJ7Jeepoffroad View Post
I would run a 2,5° key in the 500 cc
but with good fuel and clutching.
I’ve only tried keys in the 2010 500 Sno-Pro and it took it fine.
Sled is Wife's 2008 Crossfire-500
It has Boyesen RAD valve and a Speedwerx clutch kit.
I can only get 91 Octane fuel.
Riding height between 1300-2600 ft.
What do you think ?
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Old 03-12-2020, 04:04 PM   #9 (permalink)
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Current Sled(s): 2009 Z1 Turbo 2007 F1000 2007 F8SP 2007 F8 20
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Age: 34
Riding Since: 1985
Default

Quote:
Originally Posted by lasse View Post
Sled is Wife's 2008 Crossfire-500
It has Boyesen RAD valve and a Speedwerx clutch kit.
I can only get 91 Octane fuel.
Riding height between 1300-2600 ft.
What do you think ?
I don’t think you would have a problem
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