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Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing??

This is a discussion on Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing?? within the RZR 900 Engine forums, part of the Technical category; I've ran this setup at 3 and 4 degrees advanced and no issues. I'm just wondering what others think or have ran for timing with ...


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  #1  
Old August 27th, 2012, 10:06 AM
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Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing??

I've ran this setup at 3 and 4 degrees advanced and no issues. I'm just wondering what others think or have ran for timing with similar setups on premium pump gas. Thx.
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  #2  
Old August 27th, 2012, 10:34 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

3 or 4 degrees initial or total timing... I know of a few guys running 7 to 9 degrees more timing on stock motors........I know what i think is stock timing and that seems way high....just my .02

Last edited by poflo; August 27th, 2012 at 10:40 AM.
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Old August 27th, 2012, 11:11 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Are you using a Power Commander? I stopped making power on the dyno at around 5deg above stock timing on the big end, so i run it around 3 to 4 above stock. I would assume your not gonna make much more power where your running now and could probably leave stock timing only in there to give yourself a little room for error and not really leave much power on the table as well.
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Old August 27th, 2012, 11:16 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Quote: Originally Posted by Klutch View Post
I've ran this setup at 3 and 4 degrees advanced and no issues. I'm just wondering what others think or have ran for timing with similar setups on premium pump gas. Thx.
Quote: Originally Posted by poflo View Post
3 or 4 degrees initial or total timing... I know of a few guys running 7 to 9 degrees more timing on stock motors........I know what i think is stock timing and that seems way high....just my .02


Listen to Don and save yourself a lot of $$$$...
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Old August 27th, 2012, 05:25 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

So I;m running up to four over stock with 11.5 comp pistons. Is that safe with pump gas? Or should I stay at 3?
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Old August 27th, 2012, 05:38 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

You know my opinion on the topic Cole...

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Old August 27th, 2012, 05:44 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Quote: Originally Posted by AlbaNate View Post
You know my opinion on the topic Cole...

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Old August 27th, 2012, 05:48 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Nate has had a lot of motors on the dyno......He is a great person and shouldn't steer you wrong........if you are using his combination,I would go with what he says.........not every builder has the same ideas or knowledge,so what I suggest is what works for my builds(doesn't mean that there aren't others that work better)
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Old August 27th, 2012, 05:52 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

We see the same on this 1 Don and Rogue found the same with his independent testing as well. I limit to 4 degrees advance over stock at any given rpm. Anyhting past that we started seeing a drop in HP and a need for additional octane.

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Old August 27th, 2012, 05:59 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

I'm pretty conservative on timing.......I like to allow for changes in fuel & running hard on hot days......if I'm building a true race only motor,then good fuel is a must,......I then time to max torque & them back off 1 to 2 degrees....again my .02
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Old August 27th, 2012, 08:07 PM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

I think you got the input you were looking for. I'm running 4 over max, and thats only at the top. I'm also running nothing but premium now and have a little room being at 6000ft. I'm also running stock CR. If i was running your CR, i'd just drop it back to stock timing to be safe and not worry about it. If i remember right, when i was on the dyno, the difference between stock timing up top and 4deg over was 1 maybe 2whp max. Nothing to write home about....
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Old August 28th, 2012, 04:32 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

if i remember right pass 6000rpm i put the timing back to 0 because i was loosing HP if I add timing. ( and i have pretty much the same setup as you)
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Old August 28th, 2012, 04:33 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Quote: Originally Posted by swingarm1 View Post
Quote: Originally Posted by AlbaNate View Post
You know my opinion on the topic Cole...

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True statement Tim!

I think I'll back it off to 3 degrees advanced. This motor runs pretty snappy, almost like a big 2 stroke twin in a sled.

Thx for the input guys.
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Old August 28th, 2012, 04:43 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

Just thinking now, do you guys run the same timing every where in the rpm/throttle range? I've just been running the same timing from low/mid to top end. As well as startup/idle range.
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Old August 28th, 2012, 05:00 AM
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Re: Ported head, bigger valves, stage 3 cams, 11.5:1 comp pistons. How much is timing

No i use a different timming i will try to find my pcv file and i will send it to you
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