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sheetmetal Jan 4th, 04, 10:06 PM been thinking about how lazy my engine is above 5000 in the top of second and on into third. could the stock 750hp needle and seats be starving the engine for fuel? the pressure looks good, but pressure and volume are two seperat things. how large would i need to go to? my fuel system is "WAY" over kill for this engine so my thinking is the needle and seats are the only thing left to change. Thanks Dave 427L88 Jan 5th, 04, 9:45 AM How much timing is the engine seeing at 5000? sheetmetal Jan 5th, 04, 12:56 PM 36 total. all in before 2800. not sure what the basic is but about 18. Rich-L79 Jan 5th, 04, 4:39 PM If it's lazy at the top end you should be looking at jetting and/or overall fuel delivery capacity. The needle valves are not a restriction to the system if everything else is working okay. The size of the seats are limited by the size of the hole they mount in. In other words, the needle valves and seats are as big as they are going to get. You don't mention the size of the engine so perhaps your entire carb is too small if you have a large displacement engine. kjett Jan 5th, 04, 7:35 PM Dave, A .130 needle/seat flows over 50% more fuel than a .110 needle/seat. You wouldn't think that much additional fuel flow could be achieved by an additional .020 increase. Braswell's (http://www.braswell.com/html/needles___seats.html) has some good info. 427L88 Jan 5th, 04, 9:08 PM Sure, its an area calculation, square the difference. | ||