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Engine Specific Info and Questions => IDI Engine => Topic started by: Vanagoner on October 05, 2009, 09:10:59 am

Title: Extra smoke at high RPM's
Post by: Vanagoner on October 05, 2009, 09:10:59 am

I have a MKII pump on my 1.6 N/A Vanagon which I bought from a mechanic's back shelf.  As I approach the high end of the rev range (just before the factory shift mark) it starts pouring out extra smoke.  I don't get a drop in power (obviously).  This is a strong running little pump which doesn't act like the original which got weaker at the high end.  I don't know the history of the pump,  does this sound like it has already had a governor mod done to it, with a burst of extra fuel at high rpm's?

Title: Re: Extra smoke at high RPM's
Post by: arb on October 05, 2009, 09:14:34 am

What did you time it to? Sounds like the dynamic advance is a bit off for your static timing.

Title: Re: Extra smoke at high RPM's
Post by: Vanagoner on October 05, 2009, 09:25:02 am

Sorry, I timed it by ear.  It has very little clatter, and it only starts well when I have the knob pulled out.  When it is warmed up it has no discernable clatter to speak of.

Title: Re: Extra smoke at high RPM's
Post by: Vanagoner on October 05, 2009, 10:52:53 am

Thanks Andrew (I actually know that they are the max rpm marks, I just said it wrong) I don't go that high too often, just wanted to know what that rpm/smoke behaviour meant (thanks arb).  I will bump it up a little as you described.  Thanks again.