![]() I have 30 degrees max advance with no vacuum hose, and 40 degrees Max with the vacuum hose on. With the SVDA set at 7.5 BTDC it runs great. Look at which year you are and then set your idle timing with the vacuum hose plugged to what the listing says. The old school 009 dizzy need to be set at 30 degrees BTDC at 3500 RPMs.įor the SVDA look at ashman's post. Right there seems to be two different answers here one lot of people are saying about 44 btdc total advance with vacuum line connected and the other the other group of people are saying 28-32 max advance with vacuum line connected which one is it? ![]() This is just what the lean mixture needs. This increased vacuum causes the SVDA vacuum advance to increase the timing advance. this closing of the throttle does two things, it leans out the mixture and increases the vacuum below the throttle plate. Additional vacuum advance on top of this works as the load is decreased and the throttle opening closes. So a max (initial + mechanical) timing of around 28-32BTDC is all the acvw engine needs. This means additional advance above this rpm is not needed. Beyond ~3000rpm the turbulence inside the combustion chamber acts to reduce the time it takes for the ignited mixture to reach peak pressures. The procedure of using a total timing setting of 28-32BTDC (initial + mechanical) is to make sure the mechanical advance does not over advance. You need to pay attention to the model#s, there is no single SVDA timing. It requires a different timing advance curve than a manual tansmission. The second distributor is for an Auto-stick transmission which only has three gears. Notice above the initial timing settings for the two SVDA distributors is different and the amount of mechanical advance is greater on the second one which helps explain why it has a lower initial advance. Timing Set At:: 0deg TDC 800-950rpm w/strobe w/vacuum hose disconnected and pluggedĪdvance/Retard Range: Vacuum: 8-12deg Adv Centrifugal: 13-16deg 2200rpm, 25-28deg 3900rpm Here are two different timing settings for two different SVDA distributor models:īeetle 1974 * 1600 Federal Manual Trans (original VW distributor used for aftermarket SVDA designs)ĭistributor: VW 043-905- 205, Bosch 0231 170 034Ĭan Use: VW 113-905-205AL, Bosch 0231 146 101, VW 043 905 205 ZB (Mexico) (See Note Below) The only time vacuum is included in the timing "equation" is at idle on some distributors models (controlled engine speed with closed throttle plate). It can change by engine load and even air temp. Vacuum is an unpredictable variable when it comes to timing. Post up the numbers off the side of the dissy body. It seems there's not much room for error with the 34p3 carb, but it can be done and run great with the SVDA. My Bosch SVDA: 30 BTDC 3500, 7.5 BTDC at idle around 900 rpm. With the vacuum hose hooked up you should see 42-44º BTDC at 3500 with a light throttle. ![]() Note, but don't change the timing at idle (aka "iniital timing"). Remove vaccum line and time to 28-32º BTDC when it is all in around 3500 RPMs. At this setting the engine will start but not as well as if I set it at 7.5 btdc, but the car does drive a lot and I mean a lot better with it set a 2 atdc with a max mechanical advance of 30 and a total of 40 (with vacuum line connected) have I done this right or wong? ![]() Hi what ive noticed is that when I set it to 30 btdc and then recheck it with the vacuum line on I get about 40 btdc and the idle timing at this setting with vacuum line on or off is 2 atdc. "You may not get what you pay for, but you always pay for what you get" Generally you set the timing 28-32 BTDC 3500rpm with the vacuum line disconnected and the carb port plugged.ħ4 Beetle Specs | 74 Beetle Restoration | 2180cc Engine You need to try it and different settings and see which works best. which one do you have?Īlso they give a range of 28-32 because every engine is different. By the way the engine is a 1600 twin port with a 34 pict 3 carburettor. Hi all I have a svda distributor but can anyone tell me what the max mechanical advice should be (28 or 30) plus what should the overall advance should he with the vacuum line connected cause I have noticed the the total advance does go up with the vacuum line on. Posted: Fri 2:26 pm Post subject: svda distributor timing Quick sort: Show newest posts on top | Show oldest posts on top
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