Dyno question
07-26-09, 11:04 PM
#1
Rotar What?
Thread Starter
Join Date: Jul 2007
Location: Martisburg, wv
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Dyno question
When Running an rx7 on the dyno how many degrees of crank rotation before spark no one at my schools dyno can give me a straight answer and in the different suggestions i have gotten have given me very different numbers, can some one help?
07-27-09, 06:58 PM
#3
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,844
Received 2,606 Likes
on
1,849 Posts
in a rotary the rotors have 3 faces, but they are geared to turn at 1/3 of the speed of the crank. since there are 2 rotors (in a 12a/13b) there is a spark/firing event every 180 degrees of crank rotation, just like a 4 cylinder piston engine.
a 3 rotor is phased like a 6, so it fires every 120, 4 rotor is like a v8 every 90 degrees, and so forth
07-29-09, 01:25 PM
#5
Rotar What?
Thread Starter
Join Date: Jul 2007
Location: Martisburg, wv
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Awsome
i'm not even sure what you mean, so i will answer backwards
in a rotary the rotors have 3 faces, but they are geared to turn at 1/3 of the speed of the crank. since there are 2 rotors (in a 12a/13b) there is a spark/firing event every 180 degrees of crank rotation, just like a 4 cylinder piston engine.
a 3 rotor is phased like a 6, so it fires every 120, 4 rotor is like a v8 every 90 degrees, and so forth
in a rotary the rotors have 3 faces, but they are geared to turn at 1/3 of the speed of the crank. since there are 2 rotors (in a 12a/13b) there is a spark/firing event every 180 degrees of crank rotation, just like a 4 cylinder piston engine.
a 3 rotor is phased like a 6, so it fires every 120, 4 rotor is like a v8 every 90 degrees, and so forth
Thread
Thread Starter
Forum
Replies
Last Post
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM