11/30/2022 0 Comments Whatsize power valve stock 1850 holley![]() ![]() One of the misconceptions is that they can't be trusted to work because an engine backfire or "belch" can "blow out" the power valve. In other words a 6.5 power valve will open when the vacuum signal on the engine drops below 6.5" and will remain closed above that amount. The power valves are numbered by the amount of engine vacuum in inches at which they will open and add additional fuel to the power circuit. Some carbs have two power valves, while others only have one. Many 4-barrels come with a particular power valve depending on the carb list# and application. There is a lot of misunderstanding concerning power valves in Holley carbs. Similarly, a change in the carb's inlet air temperature may require a change in the jet size from the stock calibration. If you had a carb which has a stock jet size of 80 and you live or race at 2000 feet above sea level, then you would use a #79 Holley jet in the carb. For every 2000 foot increase in altitude, you can reduce the jet size by one size. Once you know the correct stock jetting for your particular Holley carb, you can determine whether you live or race at an altitude above sea level. ![]() ![]() Holley carbs are calibrated for sea level operation and an inlet air temperature of 70 degrees Fahrenheit. LIST # CFM STOCK JETTING POWER VALVE TYPE Secondaries ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |