Mechanical advance relies on one input, and one input alone: RPM. The shaft is a polished QPQ (liquid nitride) coated, large diameter (0.500-inch) steel assembly. FOR SALE - Inland Empire, CA - Mallory advance mechanical Distributor For small and big block Chevy Brand New in the box Part#5058001 $150 Price: $150 In order to perform this modification, the distributor must be removed from the engine, because moving the breaker cam 180 degrees to accomplish this task also moves the rotor 180 degrees, and the engine will be out of time. Mechanical advance activates only during high engine rpm, which causes the distributor to rotate quickly enough to activate the advance. By placing a 3/32-inch Allen wrench in the nipple, you can adjust the total amount of added advance. Distributor Vacuum Advance Mallory 29014. Same under midrange, low load conditions. There are a couple of ways to test the vacuum advance on vehicles equipped with distributors. There is one more notable feature of the Mallory Dual Points distributor. 7/10 The final step, set my Mallory Unilite mechanical dizzy to 20* initial, all in at 2,500 with 38*. It runs alot better with it hooked up. Mallory Mechanical Advance Unilite Distributor Condition is "New". You cant get that with a mechanical distributor. Without getting advance soon enough, it makes the engine sluggish, it'll have less idle vacuum, less throttle response and will generally just be a turd. I have the advance plate set at a 15 degree timing curve. Ask for more detailed pics. The Mallory Unilite #4756701 dual-advance distributor with mechanical and vacuum advance is primarily for street use. This is one robust distributor, and I am one happy customer (except for the prices on Mallory tune up parts). If you plan on all wide open throttle driving, then the mechanical only unit will work ok, but if you want to maximize driveability and power under all conditions, I dont think you can do it without a vacuum advance. A legend returns - the tried and true Mallory Unilite Distributor line is back! In the photo I'm referencing the distributor on the left. Find Mallory Ignition Distributors Mechanical Advance Type and get Free Shipping on Orders Over $99 at Summit Racing! My Buddy had a Mallory Uni-Lite that he took off a car he sold. The easy three wire hookup of the Unilite makes running a stock coil, a Mallory performance coil and even a Mallory HyFire CD ignition a snap. This distributor now provides the engine with 20 degrees of mechanical advance at the crank. PicClick Insights - Mallory Distributor 2555301 Dual Point Mechanical Advance Ford 332-428 FE PicClick Exclusive. This is the finest distributor you can get for aircooled VW's, and is a must for high RPM engines. High amount of … It cannot take into account engine load, fuel mixture or any of the many other variables that dictate ideal ignition timing. Hook the vacuum advance up to venturi vacuum, that way as soon as you touch the pedal you have advance, which means you can dump more fuel to it, and make more power….if you get 16 of vacuum advance + 12 initial= 28…adjust your mechanical advance accordingly….dont go over 36 total timing…..I dont know why all these clowns plug vacuum advance into manifold vacuum….it doesnt … So at idle you have 10o of advance. The Mallory #3756701 is a mechanical advance … The easy three wire hookup of the Unilite makes running a stock coil, a Mallory performance coil and even a Mallory HyFire CD ignition a snap. The advance limit is the total amount of advance provided by the mechanical advance. Then I just bent the tab to advance or retard the mechanical advance. Mallory Distributor, Unilite with Vacuum Advance, 4754101 is an Optical Pickup Distributor with a velvety smooth centrifugal advance. IMPORTANT!!! Back to home page. No one wants their car to be a turd, right? In the late 1970s, my friends and I used to hotrod V8 engines. This turned out to be muuch more complicated than I thought. I'm not familiar with the Mallory unit, but generally, you can adjust the amount of advance by inserting a small hex key into the vacuum port on the can and turning it to suit your needs. Connect the timing light inductive pickup to the No. It has an adjustment for mechanical adance upper limit (maximum advance stop). The vacuum can adjusts your timing depending on the load the engine is seeing. On my old mallory unilite distributor all I had to do was take off the cap and rotor and then turn ther motor untill a small tab with some marks by it appeared. Right now, without the vacuum can, your distributor only adjusts the timing dependent on the engine speed.. With a mechanical advance it should be "all in" or fully advanced by 2500-3000 rpm. Mechanical advance is how much advance the distributor will give you in addition to your initial advance. This is a tunable vacuum advance can from Accel for an HEI distributor. The conversion kits for stock distributors are different than the kits for Mallory distributors. Initial advance is set with a timing light. See my other auction for related part. Popularity - 64 views, 21.3 views per day, 3 days on eBay. Disconnect and plug the vacuum advance hose at the distributor and plug the hose. Vacuum advance applications: Disconnect the vacuum hose to UNILITE® Distributor vacuum chamber at the carburetor and temporarily plug this carburetor fitting. My question is hooking up the vacuum advance. 427 distributors, early versions, not the stamped-weights type.Where can one purchase the different springs in order to adjust the advance curve? My Motor was running an old points distributor. 1 spark plug wire and connect the power leads to the vehicle battery. Add to Watch list. The adjustment screws in the advance plate were glued in, had to disassemble the dizzy, torch the plate, rebuild and reinstall. The kits for stock distributors do work with vacuum advance. I have an aftermarket Accel distributor in it much like the MP electronic distributor. My initial at idle is 20 degrees and total is 35 degrees all in around 2800 to 3000 RPM. Recurving a Mallory distributor can be done with a curve kit. Set the mechanical timing of the engine. You would be much happier with a distributor that has a vacuum advance. To adjust the advance limit, loosen the adjustment screws and rotate the adjustment plate. If your base timing is where you want it, you might be able to easily adjust the mechanical advance. And mallody rev limiter and base my timing table based on load. We had access to a distributor machine at the trade school from which we all graduated from to confirm the modified power The key is getting the distributor to give the engine all of its mechanical advance early in the RPM range, but most distributors do the exact opposite and won't give full advance until about 4,500 RPM. We used to modify the distributor power curves by changing the weights and springs so that the mechanical advance would meet our specifications. Mallory still has the same level of reliability and performance it has long had through Unilite technology. Step 2 Connect a timing light and start the engine. Mechanics prefer to use an inductive pickup timing light. Anyone wishing to adjust the timing on their 92014 or YT-type distributor needs one of these, and the correct keys are getting increasingly hard to find. A legend returns - the tried and true Mallory Unilite Distributor line is back! the vacuum advance is independant of this mechanical advance. Now here is the problem. If the engine fails to start, rotate the distributor in small increments clockwise or counterclockwise until the engine starts. Kits come with springs and degree keys to adjust the rate and amount of advance. We Installed the Uni-Lite no problem, but he can't find the Degree Key to adjust the Advance . MSD incorporates a sealed ball bearing on the topside of the shaft that works along with an extra long sintered bearing on the bottom end (this provides increased shaft support). As the RPMs increase your distributor has a centrifugal mechanism that will gradually add more advance. I can set timing at idle to anything I happen to like for best low speed character, then adjust the max mechanical advance to give exactly 32d at 3500 rpm. It is adjustable for maximum mechanical advance, so you don't have to change mechanical parts to modify that spec. Mallory Distributor Advance Mechanical Adjustable YH and YT Series Dist | eBay. In order to obtain optimum performance, the mechanical advance for any distributor should be checked and revised as needed after the compression ratio of the engine has been changed, after a camshaft with different timing has been installed, whenever a fuel with a different octane rating is used, or if the starter has a hard time turning the engine at the factory-specified timing setting. I called Mallory they say I have to buy the whole YL-Advance Curve Kit which is … It’s configured as a mechanical advance only model (more on advance systems later). Anyone 299014 to adjust the timing on their YH or YT-type distributor needs one of these, and the correct keys are getting increasingly hard to find. Once the base timing is set to the correct position, you can connect a hand-operated vacuum pump to the diaphragm, give it a few pumps, and then watch the timing mark on the crankshaft harmonic balancer advance on the timing scale with … This distributor also has vacuum advance, for better MPG, throttle response, and much cooler running! Vacuum timing senses changes in the engine’s load, or the demand placed on the engine for power, and offers greater timing advance during low loads. There is another nifty feature in the Mallory distributor. The springs and weights in the distributor control the rate of mechanical advance, not the amount. MALLORY DISTRIBUTORS STANDARD AND VACUUM ADVANCE SINGLE AND DUAL POINT FORM 602A (REV. You can set say 10o initially. 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