Ford Mustang Forum banner

Status
Not open for further replies.
1 - 7 of 7 Posts

·
Registered
Joined
·
1,272 Posts
Discussion Starter #1
What is the diffrence between a 4 valve and a 2 valve.like i have a 302 high output for a 89.
but anyways what is it and what makes it that?
 

·
Registered
Joined
·
2,827 Posts
4 valve is 4 valves per cylinder and 2 is 2 valves per cylinder if thats what you are asking.
 

·
Registered
Joined
·
1,272 Posts
Discussion Starter #3
i need a little more info than that.like whats the diffrence of having 2 over 4.how do you know if your engine is a 2 or 4.
 

·
Registered
Joined
·
65 Posts
The main reason for four valves instead of two is weight. You will have two smaller intake valves that will equal the size of the one intake but will require less energy to operate. Same principal with exhaut valves.
 

·
Registered
Joined
·
46,020 Posts
You have an overhead valve V8, and there are some 4 valve heads for a 302 but they're ultra rare. Today's modular engines are called overhead cam engines and the moniker for them have evolved to 2V, 3V, and 4V. These represent how many valves per cylinder, 2 valves are 1 intake and 1 exhaust. 3V is 2 intake valves and 1 exhaust. 4V is 2 intake and 2 exhaust.
 

·
Registered
Joined
·
2,796 Posts
Just a minor correction....

An uppercase V is for Venturi, as in carburetor "barrels".

A lowercase v is for valve.

2v = 2 valves
2V = 2 Venturis (2 "barrel")

As far as why more valves per cylinder......many smaller valves can flow more than one large valve.
 

·
Registered
Joined
·
46,020 Posts
Glad you cleared that up.
 
1 - 7 of 7 Posts
Status
Not open for further replies.
Top