General Rotary Tech Support Use this forum for tech questions not specific to a certain model year

question on timing and detonation

Thread Tools
 
Search this Thread
 
Old 03-14-05, 10:06 PM
  #1  
Full Member

Thread Starter
 
HITMANEM2's Avatar
 
Join Date: Jun 2004
Location: MD
Posts: 247
Likes: 0
Received 0 Likes on 0 Posts
question on timing and detonation

Why do you have to retard the timing if you experience detonation?
Cuz won't this set off the spark plugs after the a/f mixture is spontaneously combusted?
Old 03-15-05, 01:05 AM
  #2  
Lapping = Fapping

iTrader: (13)
 
Jeff20B's Avatar
 
Join Date: Aug 2001
Location: Near Seattle
Posts: 15,725
Received 70 Likes on 64 Posts
No because the compression ratio in a rotary is way too low to cause a dieseling effect. It must be ignited by a spark plug if it is to be ignited at all.
Old 03-15-05, 11:32 AM
  #3  
Full Member

Thread Starter
 
HITMANEM2's Avatar
 
Join Date: Jun 2004
Location: MD
Posts: 247
Likes: 0
Received 0 Likes on 0 Posts
so if the compression is low how do you explain the detonations?
Old 03-15-05, 12:30 PM
  #4  
Open up! Search Warrant!

 
Project84's Avatar
 
Join Date: May 2002
Location: Kicking down doors in a neighborhood near you
Posts: 3,838
Likes: 0
Received 2 Likes on 2 Posts
Detonation is caused by the air/fuel mixture being ignited by compression. This is possible in a rotary engine, but only when the air fuel mixture is lean enough (lean= too much air, not enough fuel). When it gets lean, the fuel mixture is detonated by being compressed. Detonation is not as controlled or smooth as ignition. It often times causes damage to the internal components of the engine, whether it be piston or rotary.
Old 03-15-05, 02:23 PM
  #5  
Chad Carson

iTrader: (29)
 
Fire85GSLSE's Avatar
 
Join Date: Nov 2001
Location: South of Nashville TN. USA
Posts: 7,010
Likes: 0
Received 0 Likes on 0 Posts
timing issue

on that note what is the point to have too much advance timing?

I have tried to set the timing on my gslse several times with no luck.
Seems that everytime I get close to dead on it lacks major power. And well when it is out about 15 degrees it runs good but still has a slight miss.
I am running s4 rotors and housing, no emissions and s4 uim,lim, and tb with the tb mod done.

checked the timing due to a slight miss and that I was getting 150 -180 miles to a full tank.
7 has new cap, rotor, plugs, wires, 710cc injectors, and MSD coils. Running ac/ps but no emission stuff what so ever. Complete rb streetport exhaust.

Anyone have ideas?
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
Th0m4s
Build Threads
25
02-26-19 02:04 AM
smikels
Rtek Forum
4
05-12-16 12:34 AM
alphawolff
1st Generation Specific (1979-1985)
17
11-17-15 05:57 PM
CaptainKRM
2nd Generation Specific (1986-1992)
14
08-26-15 09:52 PM



Quick Reply: question on timing and detonation



All times are GMT -5. The time now is 10:23 AM.