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914World.com _ 914World Garage _ Distributors.

Posted by: Keith914 Jan 22 2017, 01:09 PM

There are varying recommendations on suitable distributors for our Type IV engines with carburetors. Some advocate use of the 009 centrifugal advance only units. There are well written recommendations from "Bubblehead" and from "air-cooled.net", both advocating/explaining why SVDA (single vacuum, dual advance distributor, -- has centrifugal and vacuum advance operating independently) are the correct type as they provide some advance at lower rpm's that eliminate hesitation from idle, and give better mpg.

Some manufacturers no longer make these SVDA distributors, but fortunately others make them, including Petronix model D186504.

What does the "brain trust" say?

Posted by: jmill Jan 22 2017, 01:52 PM

The PerTronix is a clone of the Bosch 034. I couldn't find the total advance for either. The 009 is known for its flat spot. A good SVDA dizzy will eliminate that as long as you run a vacuum line. Apparently the 034 has the same mechanical advance as the 009. If the Pertronix has 30 degrees of advance like the 050 it may be a good option.

Posted by: Mark Henry Jan 22 2017, 07:03 PM

009 sucks on a T4

Posted by: cgnj Jan 23 2017, 06:43 AM

Hi,

You never said what you currently are running on you car.

If I were starting from scratch I would look at 123ignition product. Fully programmable but expensive. I read a recent post that Jake used this distributor instead of the Unilite.

Most of the distributors that are known are also NLA.

My preference is unilite, 050, 034, stock 1.8
Carlos

Posted by: Keith914 Jan 23 2017, 04:34 PM

Ordered Petronix SVDA model D186504 Flame Thrower distributor to eliminate the flat spot from early acceleration from idle. Will report results

Posted by: JamesM Jan 23 2017, 04:47 PM

Unless you want to stay 100% stock, or just be cheap, I dont know why anyone would go with anything other than fully programmable at this point.

Posted by: Keith914 Jan 23 2017, 04:54 PM

Programable? Beyond my pay grade.

Posted by: cgnj Jan 23 2017, 05:55 PM

Hi,
123 programable is over $500. That would get you more than halfway to megasquirt with spark and cop. Sill would have to tune.

Keith, what cam is in this car? I run 163/86b. It doesn't go till 3k.

Carlos

Posted by: Keith914 Jan 23 2017, 08:44 PM

I see I forgot to mention that I have a 009 flame thrower installed, so we will see what happens to the dead spot. My rebuilt engine was '72 1.7, and is now a 2.4 with twin Webers and a matching cam.

Posted by: jmill Jan 24 2017, 09:24 AM

Webers also have a flat spot if the transition isn't right. It may be accompanied by a carb pop or just fall on its nose for a second.