Vacuum Advance With Big Cam at Dominic Nanya blog

Vacuum Advance With Big Cam. Talking to different mechanics and some say don't need a vacuum advance with a large cam and others say yes. My 350/300 has a big cam, causing a low vacuum, the fix was replacing the power valve in my holley carb. Big camshafts with lots of overlap will require some tuning to both ignition timing and carburetion to compensate for what often is a very low manifold vacuum. Engines with long duration camshafts also suffer from large overlap values that drastically reduce idle vacuum. While some engine tuners will scoff at vacuum advance distributors, they are extremely useful for street engines with big cams. One of the biggest problems with big camshafts is when the cam is added to an engine with insufficient compression. Vacuum advance calibrations are different between stock engines and modified engines, especially if you have a lot of cam and have relatively low manifold vacuum at idle. What's a novice to do?. The holley part number is 125. Engines with very large camshafts (260 degrees at 0.050 is a big cam for the street) generally require more timing at idle compared to shorter duration camshafts. For example, pertronix offers an adjustable vacuum advance canister that bolts in place of the stock canister. In most cam catalogs, the larger camshaft descriptions include a compression ratio recommendation.

Engines with long duration camshafts also suffer from large overlap values that drastically reduce idle vacuum. What's a novice to do?. Big camshafts with lots of overlap will require some tuning to both ignition timing and carburetion to compensate for what often is a very low manifold vacuum. For example, pertronix offers an adjustable vacuum advance canister that bolts in place of the stock canister. The holley part number is 125. My 350/300 has a big cam, causing a low vacuum, the fix was replacing the power valve in my holley carb. One of the biggest problems with big camshafts is when the cam is added to an engine with insufficient compression. In most cam catalogs, the larger camshaft descriptions include a compression ratio recommendation. While some engine tuners will scoff at vacuum advance distributors, they are extremely useful for street engines with big cams. Engines with very large camshafts (260 degrees at 0.050 is a big cam for the street) generally require more timing at idle compared to shorter duration camshafts.

Carb Science Series Carb Tuning for BigCam Engines

Vacuum Advance With Big Cam The holley part number is 125. Engines with long duration camshafts also suffer from large overlap values that drastically reduce idle vacuum. My 350/300 has a big cam, causing a low vacuum, the fix was replacing the power valve in my holley carb. Engines with very large camshafts (260 degrees at 0.050 is a big cam for the street) generally require more timing at idle compared to shorter duration camshafts. One of the biggest problems with big camshafts is when the cam is added to an engine with insufficient compression. The holley part number is 125. In most cam catalogs, the larger camshaft descriptions include a compression ratio recommendation. While some engine tuners will scoff at vacuum advance distributors, they are extremely useful for street engines with big cams. Big camshafts with lots of overlap will require some tuning to both ignition timing and carburetion to compensate for what often is a very low manifold vacuum. For example, pertronix offers an adjustable vacuum advance canister that bolts in place of the stock canister. Talking to different mechanics and some say don't need a vacuum advance with a large cam and others say yes. Vacuum advance calibrations are different between stock engines and modified engines, especially if you have a lot of cam and have relatively low manifold vacuum at idle. What's a novice to do?.