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jbfelix

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Reply with quote  #1 

About a year ago I converted my 72 super beetle to electronic ignition and it's been running like a champ with no problems at all. I've been hearing all kinds of talk about being able to open up my spark plug gap for better fuel mileage and performance. Could anyone tell me if what I hear is true or false? If this is true what should I gap my plugs to? My current gap is 0.025" like the manual said.

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YELLRHD

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Reply with quote  #2 

You can only open up the gap if you have installed a high capacity discharge ignition like an MSD or similar. If all you have done is the common points to electronic conversion then stock gap is what you need


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68autobug

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Reply with quote  #3 
Hi
Yes , You need a high power electronic ignition system like a black box type that Boosts the power from Your coil.
I had a home built High Power Ignition which put 32 volts into the coil which puts VERY high Voltage to the spark plugs..
and it was suggested You could open up the spark plug gap..

Just using an electronic ignition in the distributor like Pertronix etc..  just eliminates the points and condensor...

cheers

LEE




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fatalifeaten

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Reply with quote  #4 
With Respect to Lee and Yellrhd, you CAN open your points up more even with just a pertronix and a completely stock engine. More spark will equate to more fuel burn and better mileage/performance, as you stated. however, you need to work this and measure your results to find the butter zone. Each engine and each environment will be different so you need to test, tune, test again, tune some more, etc... Until it's happy. I'm running .032 gap on an 009 with points and a stock coil, and I average 2 mpg more than I did at .026 gap. I've got dual carbs and a cam in my engine, which also makes a difference in the amount of fuel I'm putting into the head.

As stated though, a high performance ignition will yield significantly better results than just stock components, but every little bit helps, no?


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68autobug

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Reply with quote  #5 
that is something I didn;t know..

I thought You needed MORE spark to open the gap wider..

so, You are saying there is enough spark normally to fire with a wider gap

cheers

LEE


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fatalifeaten

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Reply with quote  #6 
Absolutely. I wouldn't have thought so either, but I was sort of pointed and laughed at by a good friend who is a performance hot rot mechanic as his day job and daily drives a '65 beetle. He reminded me that VW conservatively tuned everything on our engines trying to minimize failures and increase longevity and service range (climates).With his guidance, access to a wideband airflow meter, a handfull of jets, and a couple of weekend tuning sessions, we got my engine dialed in nicely. Plug gap was the last thing we adjusted and it helped quite a bit.

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68autobug

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Reply with quote  #7 
Hi
well, You learn something every day.
I'll have to try .032" on My SVDA with pertronix.
I did read read where with a high energy spark system You can go to .040" gap because of the higher voltage spark. but never ever thought of increasing the standard gap..  Only problem when the gap gets worn down Your engine will probably get smaller spark.. and worse fuel economy.  otherwise a normal gapped plug may get worn down to .032" gap and run better

cheers from Australia

Lee



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subwayaz

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Reply with quote  #8 
I wasn't aware of the ability to change the gap with the electronic ignition.  Thanks for the tip and explanation.
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