Stupid Question. How Many Valuve Is The 99-02 Gt 4.6?

Unit 5302 · 04-25-2002, 11:28 PM

Pretty quick to see. Take a 4" cylinder bore, like the 302. About the biggest you can go with 2 valves is 2.02"/1.60." So your entire cylinder head area (if everything were flat) would be 12.56." The valves take up 3.205" + 2.011" = 5.216" of area. That's out of 12.56" of total area that could be utilized for the valves.

Now, if you were to do a 4 valve setup, like the Dominion 32 valve heads for the 5.0 OHV engine, it would use 2 - 1.60" intake and 2 - 1.40" exhaust valves. That's 2.011" + 2.011" + 1.539" + 1.539" = 7.10" of area. The increase in valve area to flow air through increased from 41.5% to 56.5%. An overall increase of 36% going from 2V to 4V per cylinder. Going to 5V per head, like a Ferrari would add even more, but it decreases in gain as you increase the number of valves. I think there are even some 6V heads out there for some engines. I can't see them being much more efficient than a 5V setup, and that's not a whole lot better than a 4V setup.

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
question about o2 sensors on a 95 GT	HopingForAGT	Windsor Power	4	06-04-2002 01:17 AM
02 Gt or 02 Z28..that is the question.	Nick	Modular Madness	11	07-16-2001 09:49 PM
Question: '97 Mustang GT	crumbie	Modular Madness	7	05-08-2001 08:39 AM
Stupid question	98'MustangGT	Modular Madness	4	09-19-2000 09:57 AM
99/00 GT Question	98YellowGT	Modular Madness	6	07-18-2000 06:05 PM

04-25-2002, 11:28 PM	#1
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Pretty quick to see. Take a 4" cylinder bore, like the 302. About the biggest you can go with 2 valves is 2.02"/1.60." So your entire cylinder head area (if everything were flat) would be 12.56." The valves take up 3.205" + 2.011" = 5.216" of area. That's out of 12.56" of total area that could be utilized for the valves. Now, if you were to do a 4 valve setup, like the Dominion 32 valve heads for the 5.0 OHV engine, it would use 2 - 1.60" intake and 2 - 1.40" exhaust valves. That's 2.011" + 2.011" + 1.539" + 1.539" = 7.10" of area. The increase in valve area to flow air through increased from 41.5% to 56.5%. An overall increase of 36% going from 2V to 4V per cylinder. Going to 5V per head, like a Ferrari would add even more, but it decreases in gain as you increase the number of valves. I think there are even some 6V heads out there for some engines. I can't see them being much more efficient than a 5V setup, and that's not a whole lot better than a 4V setup.