##  ##  
 ##  ##  
 ##  ##  
  #####  
    ##   
 ####    

   ##    
         
  ###    
   ##    
   ##    
   ##    
 ######  
         

         
 ####### 
 ##  ##  
    ##   
   ##    
  ##  ## 
 ####### 
         

 ___   
(  _`\ 
| (_) )
|  _ <'
| (_) )
(____/'
       
       

           
     /\    
    /  \   
   / /\ \  
  / ____ \ 
 /_/    \_\
           
           

IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now.


Visit Preferences to set your user name
Summary of change:
'''Location: ''' Ski, Norway. (It would be nice if everyone gave a hint where they are located.) '''Resources:''' Microcontrollers and Realtime programming since 1984. Mostly support and making hardware drivers. Have used AVR and WinAVR in a couple of recent projects at work. Schematics and board layout. Obviously no Wiki expert. ;) '''Cars:''' Alfa GTV 2.0TS. I think I'll leave this with the brain it has. ;) Maserati Biturbo Spyder. ***Original ECU: Magneti Marelli IAW. ***It has a 2800cc 90 degree V6 engine with 2 turbo units (surprize!). ***One IHI RHB50 for each cylinder bank. ***The MM-IAW use separate injection and ignition ECU's. ***The boost control solenoid is controlled by the ignition ECU (Check) to a 0,7bar overpressure. ***Both ECU's are based on MC6801 + MC1442 (ADC) + MC6840 (Timer/Counter). ***Knock sensor located between cylinder banks, goes through HPF made up of LM2902 with gated output to ADC. ***It has an absolute air pressure sensor built into one of the ECU's (Check which of them). ***It uses 2 coils going into a distributor using a rotor with 2 separate fingers. They fire in succession. ***It has one crank sensor on the front with 6 unevenly spaced tabs on the pulley to time the events, and one cam sensor on the right camshaft to phase the spark events. ***The injection ECU has one analog channel for the Throttle Position Pot, and one input from the AC signalling when the compressor is enabled. Anything else I should mention? Just ask! I know the car and engine fairly well. This engine is presently not in the car. It now runs with a 2500cc pressurized carb system. The 2800 is in pieces that are planned to come together this winter. Besides cleaning up ports and valve pockets, it is standard. There should be no reason to do anything internally. There are AFAIK only 2 common reasons for it to blow up: bad maintenance or not properly assembled. There is probably no sensible reason to not use the MM-IAW, but then I'm known not always to make sense. ;) ---- It has been established that the Maserati V6 engines are odd fire, the exact angle of the trigger pulses are still unknown. An hopefully easy to understand example in engine degrees: 0 +90 90 +150 240 +90 330 +150 480 +90 570 +150 720 If we remove 360deg from all values >= 360 we get: 0 90 240 330 120 210 0 If we interlace them and apply the 90/150 degree rule to the table: 0 90 (90-90=0) 120 ignore 210 ignore 240 (240-150=90) 330 (330-90=240) 0 ignore 90 ignore 120 (360+120-150=330) 210 (210-120=90) 240 ignore 330 ignore 0 (360+0-150=210) 90 (90-90=0) 120 ignore 210 ignore 240 (240-150=90) 330 (330-90=240) 0 ignore 90 ignore 120 (360+120-150=330) 210 (210-120=90) 240 ignore 330 ignore 0 (360+0-150=210) 90 (90-90=0) We find that we want to ignore two triggs and then act on two triggs. We also see the 30/90 pattern in the triggerwheel that can be used to update rpm. Some thinking also show how the Buick odd fire engine can be run with wastefire! As usual with waste fire grouping we take the Buick fire order: 1-6-5-4-3-2, write on two rows: 1-6-5 4-3-2 The columns are grouped on each wastespark coil. Adding 90+150+90give us 330 degrees betweeen #1 and #4 TDC's and that means that #4 is 30 deg BTDC in it's exhaust stroke when #1 is in compression TDC. That should be ok. Counting the other way around starting from #4 compression TDC give 150+90+150=390 which would indicate that #1 is 30 degrees into it's intake stroke when #4 is at compression TDC. I get a feeling that late timing might be bad as if we were to fire at TDC the #1 cylinder would start to fill up with fresh mixture! IF COIL ON PLUG IGNITION is used you can even trigg it with only a multitooth crank trigger! If waste fire was to be used the cylinder that has an early twin would be fired at the right time and 60 degrees to early! ---- Einar (Spamcheck-AT) Sjaavik (Spamcheck-DOT) com check out ChatViaIrc and come there and chat with us... //Emil Larsson, Sweden Thanks for the invitation. I may try that. Is there any time for "club meetings"? It seems to me a small group like this it would be difficult to meet someone just by chance? '''OK. I admit I was wrong. It was not difficult. @Emil: The engine I mentioned is a B230ET from a 940.''' MembersPage/ESjaavik/CompileNotes
Optional: Add document to category:
Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.