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Unread 11-29-2014, 04:12 PM   #1
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Default 2pg timing

Yeah, I looked...

On an 88, there are:
2 trigger bumps on a plate that bolts to the flywheel.
1 pickup

Does it fire the plug at roughly 20 degrees BTDC and 20 degrees ATDC?
If not, how does the single pickup "know" which bump to be aroused by?
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Unread 11-29-2014, 04:52 PM   #2
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Default Re: 2pg timing

And then, since fixed timing is such a compromise, and sustained higher-rev running at 20 degrees may be deadly in a tuned-up engine, a retard function 5-pin maybe?

Instead of a boost switch, a full-throttle micro would do it, or tied in to the stock governor, etc
http://www.instructables.com/id/Dirt...harged-engine/
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Unread 11-29-2014, 06:45 PM   #3
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Default Re: 2pg timing

If you retard that motor 10 at the higher rpms, it will fall on its face, and run much hotter.
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Unread 11-30-2014, 09:21 AM   #4
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Default Re: 2pg timing

Quote:
Originally Posted by 1989Marathon View Post
If you retard that motor 10 at the higher rpms, it will fall on its face, and run much hotter.

Thank you. While that may be true with a stocker, I'm running a substantially different setup, with snowmobile bits. I'll be making peak power at twice the revs of the iron jug they come with. Fixed timing is fine with low revs, low compression, very mild port timings, but more aggressive setups will melt pistons at 20 degrees and high revs. My thoughts were, to advance to 22-25-ish, retard for starting and high revs.

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Unread 11-30-2014, 09:24 AM   #5
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Default Re: 2pg timing

Post #1 is the one I could use an answer to :)
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Unread 11-30-2014, 10:36 AM   #6
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Default Re: 2pg timing

Got it. If you are going over 6000 rpm, it's a good idea to have that curve.
I was under the impression that you were looking to retard the timing at higher rpms. I guess a better description would be that you are looking to advance the timing only in the low-mid range. You won't be retarding below base timing.

There are two bumps on the flywheel for forward and reverse timing. One bump is for fwd, the other for rev. I believe they are at 18 for fwd, and 21 for rev. +/- 3.
The second hit is just a wasted spark.
What software is that in the pic?
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Unread 11-30-2014, 10:48 AM   #7
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Default Re: 2pg timing

What is your avatar showing? It looks like a hypoid pinion welded to a ring gear?
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Unread 11-30-2014, 11:23 AM   #8
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Default Re: 2pg timing

Sweet, I was hoping it triggered on both, and there was no real voodoo inside the box.
I'd seen the 18/21 numbers, and am basing my assumptions on that.

Pic is a generic interweb grab, just a visual of my intent, showing the low-high-low "curve", even if mine would be shaped more like an outhouse silhouette.

I'm looking to advance the timing manually, via rotating the pickup, retard electronically for start/idle, and sustained higher revs. +7, for 25 degrees forward, 14 degrees reverse, should be fine? Dropping 10 degrees when it's up "on the pipe", should save the piston and make more power

Sure, I'm complicating a simple setup, but it seems a lot easier than adapting a bike/sled/quad system, and dealing with no reverse capabilities. I'd rather have a nice digital curve, and looked at using a pair of pickups, 40 degrees apart, on the outside of the flywheel, single bump on the OD, and switching them along with the F/R lever. Then a second bump at BDC, only to trick the CDI in to thinking it's on the higher-revving scooter, halving the RPMs of the curve points.

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Unread 11-30-2014, 11:25 AM   #9
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Default Re: 2pg timing

Quote:
Originally Posted by 1989Marathon View Post
What is your avatar showing? It looks like a hypoid pinion welded to a ring gear?
Yes, I heard that all the cool kids had welded diff gears
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Unread 11-30-2014, 11:53 AM   #10
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Default Re: 2pg timing

Quote:
Originally Posted by TheGDFP View Post
Yes, I heard that all the cool kids had welded diff gears
Not really sure how that would work... but, OK!
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