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914World.com _ 914World Garage _ Little help please

Posted by: RonnieJ May 24 2004, 01:59 PM

Need some advice. my 1.7 has dual 40 webers and electronic ignition. the timing is set 34 BTDC but I still get a litte bit of hesitation in first gear between 1500 to 2000 rpm's. What do you think it is. Any help is much appreciated.

Posted by: mike_the_man May 24 2004, 02:01 PM

Shouldn't the timing be set to 27 degrees. Maybe I'm confused. It's 27 degrees for a 2.0L, not sure about a 1.7L

Posted by: mike_the_man May 24 2004, 02:09 PM

Yup, Pelican says 27 degrees at 3500rpm for a 1.7. Sounds like you have too much advance to me.

Posted by: vsg914 May 24 2004, 02:09 PM

Carbs have more advance. 27 is for stock FI.

2.0 and 1.7 time the same.

Posted by: mike_the_man May 24 2004, 02:12 PM

Ok, never mind. All I know is FI, and even my knowledge of that is questionable. I'm of no help.

Posted by: vsg914 May 24 2004, 02:13 PM

Here is what the pelican article says about timing with carbs

When setting the timing for your 914 with carbs, after following all of the advice above, such as setting the dwell angle, you will need to know where to set the timing and at what RPM. Most advice of late is to set the timing at 34 to 36 degrees BTDC with the engine running at 3200RPM with the vacuum advance line to the distributor connected. This means, you have a total advance of 34 to 36 degrees when the engine is not loaded up (bogged down). Using the Bosch 205AA distributor, I found this setting to provide excellent performance and drivability at all RPMs and speeds. The vacuum advance on the distributor lets up a bit, providing some retard, when the car is under load, like when punching it pass lesser cars, thus preventing ping (predetonation) and providing a smooth acceleration.
If you don’t have an “advance” timing light, which allows one to dial in an advance and time to the TDC mark (or any other point for that matter with a little arithmetic), you need to know where on your fan to place your timing mark. Fear not, the mark is already there, but it is not “marked”. Refer to the attached photo of a 1.7L fan (The 34-35 degree timing mark on the 1.8 and 2.0 fan is in the same place). The 914 fan has four thick spreaders spaced at 90 degree intervals around the fan. The first spreader to the left of the TDC mark, as viewed from the back of the car, is where you will find your mark. Note that the spreader has a raised oval mark on it. The left edge of that mark is right between 34 and 35 degrees BTDC.

What’s great about this built-in timing mark is that you can see it without having to be a contortionist. Unlike the TDC, 7.5, and 27-degree marks found on various 914 fans, which are located on the back edge of the fan, this “mark” runs all the way across the fan. (Yet another advantage for carbs?)

To set the total advance timing, hook-up your timing light to the cylinder 1 plug cable and put on your headphones (3200 RPM can be pretty noisy with your head in the engine compartment). With the parking brake on and the car in neutral, ask one of your kids to hold the car at 3200 RPM (my kids love this “driving”), while you twist the dizzy to meet the newly found timing mark on your 914 fan.

Posted by: Bleyseng May 24 2004, 07:22 PM

My guess is that you are running a 009 dizzy and thats your problem. Damn things give you a hole because their advance curve is all wrong for these motors.

Geoff