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MG MGB GT V8 Factory Originals Technical - FI distributer curve

I have been running a hot wire system for several months now and seem to have all the bugs out. Some of the reading I have done leads me to believe that the FI dizzy has a different advance curve than the one we use for carbs.

Does anyone have any info?
Jim Stuart

Hi Jim,

The advance curves will be a bit tighter for the FI dizzy. This is because all FI engines were designed for reduced emisions and are low compresion motors. To much advance throws the HC levels up and will ping on these motors.
M Mallaby

As my 4.0 is no longer low compression- 9.8:1, and I have a mild cam upgrade, it seems I should ignore the stock FI curve and stick with the more agressive carbed engine curve. Agree?
JimStuart

Sure, why not, If you don't have emisions issues and it doesn't knock it will make more power.

Have fun.
M Mallaby

I'm not positive of the specs for this application, but FI dizzys usually have much less advacne - require more static advance than a carbed version.

Jim, you should try a 10 degree (20 crank) distributor "all-in" by 3000 rpms for starters. It should work fairly well with your HC engine.

I do recurves as cheap as $25 if its clean and easy. Email me if you're interested. I can have it back in the mail the same day I receive it!
Jeff
Jeff Schlemmer

This thread was discussed between 15/09/2006 and 22/09/2006

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