Rigid_EVO Ignition timing changes when engine is HOT

[groovemeisterus]

Need some community feedback. Ever since I hot rodded my engine, when engine gets too hot after long rides, then slow down thru curves, timing always seems to go off and exhaust notes sound funny and engine acts kinda weird when stop at stop sign.

After upgraded to SE performance module years ago it started after engine got hot, then worse thru out the year or two. Then later down the road I got the Twin Tec 1005S EX. Issues went away, but later returned after so many heat cycles.

As normal... when engine cooled down, everything functioned as normal.

A friend fabricated a donut cover so air can get in and help cool it, but isn't enough, but does help.

Untitled by groove meisterus, on Flickr

I talked to Twin Tec, actually just got off the phone and they suggested the 1007 EX Internal to External Ignition Conversion. Which of course moves the electronics to under the seat away from the heat.

They said once a "cone" ignition module gets hot, it's just a matter of time before a full failure with more HOT heat cycles. Which I believe is how my old SE Performance module went out. When it got too hot after so many cycles, its failure mode was to make the engine sound like a sewing machine almost with the timing way off.

http://www.daytona-twintec.com/1007e...ersionkit.aspx

Has anyone ever experience something similar?

I'm using curve 0, with module offset by 0.05" from a Hammer Performance thread I ran across a long while back for a good curve. And has been fine.

Or has anyone have any suggestions for a different "cone" to "external" conversion from a different manufacture? Or Just an external ignition, then the parts to use in the cone if would be less expensive?

If not in signature engine is as follows...
- 2000 XL 883-1200 Conversion
- New 1200 Jugs, not 883 converted to 1200
- Branch Flometrics #5 ported 883 heads with heliarc welded and cut bathtub chamber and 30 degree cut for 30 degree domed pistons for good squish area.
- Bob Woods Prowler Cams 0.590" Lift
- Mikuni 42mm Carb.
- Tach
- Voes set to 4.5 inches... stock 6" VOES was on the edge switching the curves at 5ish Vacuum so at idle VOES was off from stock, in which engine is not.

Thanks for any feedback

[IXL2Relax]

You don't have a location filled in for your profile.... So, where do you live? Climate in the discussion matters.

Have you gotten an infrared thermometer to check to see how hot the engine is running? At the heads? At the nosecone?

What is do the plugs look like when you do a CHOP CHECK at sustained High Speed? Fuel does provide cooling.

The nosecone is a bad location for electronics.

Someone created a finned heatsink to use as the cover.

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[groovemeisterus]

Originally Posted by IXL2Relax

You don't have a location filled in for your profile.... So, where do you live? Climate in the discussion matters.

Have you gotten an infrared thermometer to check to see how hot the engine is running? At the heads? At the nosecone?

What is do the plugs look like when you do a CHOP CHECK at sustained High Speed? Fuel does provide cooling.

The nosecone is a bad location for electronics.

Someone created a finned heatsink to use as the cover.

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For FREE Sportster Tech Info from the XLForum:
Explore The Sportsterpedia - The Best Kept Secret on the XLForum!

I'm in Indiana. But also ride the black hills during the sturgis rally every year. Gets worse while riding the hills going slower thru the curves. I have oil temp gage I use... but good idea on portable infrared thermometer to use on a next run for nose cone temp.

I'm pretty sure it is because of my engine setup, and riding it like I stole it, and heat build up in the cone. Cause when I slow down, less air to cool the engine, it will sound a little different with exhaust notes, and run a little weird.

Once back up to speed and more air, cools it down, and goes away.

I've had oil temps close to 250 before from temp oil stick in tank. When I start hearing and feel something, i'll move my leg and look at temps and they are usually high when it happens.

When first got Twin Tec, all was good for a while like the SE module was at fault. But after a while, like Twin Tec tech guy mentioned over the phone, once ignition module gets too hot, the heat starts eating away at the ignition cone electronics.

And the more it happens, the more likely will get worse, like the SE one did before I replaced it. I'm thinking just a matter of time before my current twin tec goes out.

But yeah, either get a new same model and not worry about all the harness changes and new module under the seat, and repeat every 5 years or so, or get an external ignition module that goes under the seat.

Just curious which other manufactures make a similar setup that twin tec does that may be less expensive, or just plain better.

[IXL2Relax]

Here's the Sportsterpedia section of the popular Ultima module:
http://sportsterpedia.com/doku.php/t...econe_ignition

Are you sure you're not running lean, causing elevated temps?

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[groovemeisterus]

Originally Posted by IXL2Relax

Here's the Sportsterpedia section of the popular Ultima module:
http://sportsterpedia.com/doku.php/t...econe_ignition

Are you sure you're not running lean, causing elevated temps?

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For FREE Sportster Tech Info from the XLForum:
Explore The Sportsterpedia - The Best Kept Secret on the XLForum!

Thanks. Yeah pretty sure not running lean. Same thing happens in the black hills since carbureted and runs richer in higher altitudes.

But a dyno run and or tune wouldn’t be a bad idea to check things out.


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[IXL2Relax]

I dug up the thread I referred to above - About a heat sink for the nosecone:
http://xlforum.net/forums/showthread.php?t=2073576

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[groovemeisterus]

Originally Posted by IXL2Relax

I dug up the thread I referred to above - About a heat sink for the nosecone:
http://xlforum.net/forums/showthread.php?t=2073576

IXL _______ >>>> My Motorcycle Chronicles Are Here <<<<
For FREE Sportster Tech Info from the XLForum:
Explore The Sportsterpedia - The Best Kept Secret on the XLForum!

THanks ! Will check it out.