What should the ignition timing be on a Ford 351?
What should the ignition timing be on a Ford 351?
Igniton timing should be checked two ways at 2,500 to 3,500 rpm: vacuum advance connected and disconnected. Total ignition timing with vacuum advance connected should be no more than 36 degrees BTDC. At idle, it should be 6 to 12 degrees BTDC.
What do I need to adjust ignition timing?
Adjusting ignition timing must be performed with a timing light with an accurate harmonic balancer. Be sure your harmonic balancer has its timing marks properly indexed. You’d be surprised how many times you get it wrong using a worn-out balancer or one improperly indexed from the factory.
How do you find the timing number on a harmonic balancer?
Shine the light directly onto the harmonic balancer and find the number. Though the wheel is turning, the light should seem to “freeze” it at a particular number. This is the timing number. Note the number of degrees to the right or left of zero. As the RPMs increase, the point at which the spark plug is firing should also increase somewhat.
How does the vacuum advance work on a Ford 351?
The vacuum advance is operated off throttled vacuum advancing the spark when you step on the gas. As revs increase, vacuum advance smoothly hands off to the centrifugal advance, though both work continuously.
Igniton timing should be checked two ways at 2,500 to 3,500 rpm: vacuum advance connected and disconnected. Total ignition timing with vacuum advance connected should be no more than 36 degrees BTDC. At idle, it should be 6 to 12 degrees BTDC.
When did the Ford 351W V-8 come out?
The 351W, or Windsor, engine is the last in Ford’s 90° V-8 series engines that started in 1962 with the 221, then moved to the 260, 289 and 302 engines. The 351W was introduced in 1969. Unlike many V-8 engines that have timing numbers on a stationary marker attached to the timing cover,…
What do the numbers mean on a Ford 351W?
In both styles, the numbers approaching the pointer represent degrees of crankshaft rotation before top dead center, which is when the piston is at the absolute top of its stroke. In the first style, the numbers 12 through 0 are the degrees before top dead center. The 3 following the 0 represents degrees after top dead center.
The vacuum advance is operated off throttled vacuum advancing the spark when you step on the gas. As revs increase, vacuum advance smoothly hands off to the centrifugal advance, though both work continuously.
What should the BTDC be on a Ford 351 Cleveland?
At idle, it should be 6 to 12 degrees BTDC. By 1973, distributor vacuum control became more complicated, with some applications having an advance/retard unit and some having only an advance unit. Unless you’re restoring to stock, this should never be of concern.
How big is the distributor shaft on a Ford 351?
(Comp Cams offers a composite distributor drive gear that wears quite well.) Keep in mind there are two distributor shaft sizes: .530 and .467 inch. It’s important to have distributor shaft end play within Ford specs to eliminate any chance of extreme wear.
How to build a Ford 351 Cleveland Engine?
This Tech Tip is From the Full Book, FORD 351 CLEVELAND ENGINES: HOW TO BUILD FOR MAX PERFORMANCE. For a comprehensive guide on this entire subject you can visit this link: SHARE THIS ARTICLE: Please feel free to share this post on Facebook / Twitter / Google+ or any automotive Forums or blogs you read.
How do you time a Ford 351 engine?
Use a wrench to loosen the distributor hold-down bolt. Loosen it just enough so that you can turn the distributor with some effort; otherwise, it will move by itself when you start the engine. Start the engine and shine the timing light down onto the timing pointer and balancer. Be careful of moving belts and the fan.
How to check ignition timing on Ford 351 Cleveland?
Ford 351 Cleveland Engine Ignition Guide: Timing. Under hard acceleration or loaded on a dyno, listen for spark knock. If you have spark knock, retard ignition timing 1 degree at a time and try again. When you’re checking ignition timing, you want to know total ignition timing (advance), and the rate of advance when the throttle is opened.
When did Ford stop making the Ford 351?
The 351 was produced from 1969 until 2001, but complete engines can still be purchased. Engine timing is accomplished in the same manner as any Ford V-8 engine. Locate the timing pointer attached to the timing chain cover, below the water pump on the passenger’s side of the engine.
What kind of distributor do I need for a Ford 351?
You can adjust total timing, rev limit, rate of advance, and more with this distributor using a small, fl atblade screwdriver. Outside of the E-Curve, choosing and tuning an MSD distributor is easy. For the street, you want the MSD #8477 Pro-Billet distributor with a vacuum advance.
