Like Tree5Likes

"the engine tuning bible"

Old 09-24-2009, 08:25 PM
  #136  
Tech Prophet
Thread Starter
iTrader: (96)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,844
Trader Rating: 96 (100%+)
Default

when this floptest yields a leakdown of about 15 seconds , the engine is perfect .


do not oil the cylinder before leakdown test , it will change the results dramatically .
houston is offline  
Old 09-25-2009, 09:43 AM
  #137  
Tech Fanatic
 
SteveP's Avatar
 
Join Date: Mar 2002
Location: So Cal
Posts: 919
Default

LOL! Yes, adding oil will make a "dead" engine appear to be much better than it is.
SteveP is offline  
Old 09-25-2009, 10:16 AM
  #138  
Tech Prophet
Thread Starter
iTrader: (96)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,844
Trader Rating: 96 (100%+)
Default

Originally Posted by SteveP
LOL! Yes, adding oil will make a "dead" engine appear to be much better than it is.
its a new engine
houston is offline  
Old 09-30-2009, 06:00 AM
  #139  
Tech Apprentice
 
Join Date: Aug 2008
Posts: 76
Default

Originally Posted by M7H
Your almost there!
Try to lower the idle a little bit, you will see it will work, if you give a short pull on the throttle, you will give the engine a bit extra fuel, which will lower the idle....
So, just lower the idle a little bit....
Only, it might be possible that the idle will be to low when your engine is not fully on operating temps after a warm start... (hard to explain, you will recocnize it when it happens)
Hi All,

you are right M7H.
I set the HSN 1/8 rich because it was to lean (now it has 10 to 15 sec the higher idle) and than I lowered the idle and it was really perfect.

And I know what you meant "Only, it might be possible that the idle will be to low when your engine is not fully on operating temps"
After a cold start the idle is to low, but it is only a couple of rounds and than it is perfect.

Thanks a lot to all of you - my issue is now fixed and I have understood how it really works.

But I have as well seen that it is different from engine to engine. Some of them have these high - low idle fall down after 15sec others like the RBs not.

racer_hh
racer_hh is offline  
Old 09-30-2009, 07:53 AM
  #140  
M7H
Tech Elite
 
M7H's Avatar
 
Join Date: Dec 2004
Location: The Netherlands
Posts: 2,198
Default

Your welcome!

The other engines your talking about also might have other small problems, like leakages, on which they will get some false air, maybe a bad front engine bearing, who knows....
Just focus on your own stuff, and get it running the best you can!...
M7H is offline  
Old 09-30-2009, 12:11 PM
  #141  
Tech Master
 
Lille-bror's Avatar
 
Join Date: Jul 2009
Location: Frederikshavn, Denmark
Posts: 1,792
Default

Hi Racer_hh.

Nice work

You have set the HSN and LSN perfectly now. That means that you close to never, will have to tune the LSN ever again. All it takes is to adjust the HSN a little in or out if something isn't right during a race day or the next time, you are at a track.

If you want, you can make a temperature measurement now. That is when you engine is completely warm. Make the measurement with a full tank. This is the right temperature for your engine/car/setup/track/driving style this specific day. Eg. on a colder day, other track, other gearing etc. etc. it may change a little.
You will find out that the temperature will change 8-15 degrees Celsius depending on how much fuel, you have in the tank. Full tank = richer setting = cooler temp - and visa versa.

You are up for a long happy racing career, now you took your time, and got to learn how those wonderfull engines work.

Cheers
Lille-bror is offline  
Old 09-30-2009, 08:26 PM
  #142  
Tech Rookie
 
Join Date: Sep 2009
Posts: 6
Default

Thanks much definitely a worthwhile read for a Newbie like myself; thanks for for the Thread
subwayaz is offline  
Old 10-01-2009, 10:22 AM
  #143  
Tech Apprentice
iTrader: (1)
 
Join Date: Sep 2009
Location: Royersford PA
Posts: 98
Trader Rating: 1 (100%+)
Default

I have taken Rob's bible and converted it to Word format - easier to read, print, and carry in my opinion!

Hope this helps.

Bob
Attached Files
File Type: doc
Rob Paris Engine Tuning Bible.doc (196.0 KB, 816 views)
orcusomega is offline  
Old 10-01-2009, 11:52 AM
  #144  
Tech Prophet
Thread Starter
iTrader: (96)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,844
Trader Rating: 96 (100%+)
Default

Originally Posted by orcusomega
I have taken Rob's bible and converted it to Word format - easier to read, print, and carry in my opinion!

Hope this helps.

Bob
thats pretty cool


its Ron Paris r.i.p.
houston is offline  
Old 10-07-2009, 03:57 PM
  #145  
Tech Elite
iTrader: (25)
 
Racecrafter's Avatar
 
Join Date: Apr 2007
Location: RC Mecca
Posts: 4,140
Trader Rating: 25 (96%+)
Default

Not in any way shape or form to discount or defame Ronnie, I think I have found an error in the tuning bible. Has this been pointed out before?

"One tell tale sign of this is if after revving up the completely warmed up engine it tends to idle fast for a few seconds then drops to lower idle speed. If you start leaning the bottom end a little at a time [then repeat the revving up and idle test] and it takes longer before the idle drops your going in the right direction.""

I find that the longer the time until high idle drops it's too rich. If idle never comes down it's too lean or needing idle adjustment.. ?


Monty?? Help with this one.
Racecrafter is offline  
Old 10-08-2009, 06:53 AM
  #146  
Tech Addict
iTrader: (5)
 
NitroWD's Avatar
 
Join Date: Dec 2007
Posts: 622
Trader Rating: 5 (100%+)
Default

Originally Posted by Racecrafter
Not in any way shape or form to discount or defame Ronnie, I think I have found an error in the tuning bible. Has this been pointed out before?

"One tell tale sign of this is if after revving up the completely warmed up engine it tends to idle fast for a few seconds then drops to lower idle speed. If you start leaning the bottom end a little at a time [then repeat the revving up and idle test] and it takes longer before the idle drops your going in the right direction.""

I find that the longer the time until high idle drops it's too rich. If idle never comes down it's too lean or needing idle adjustment.. ?


Monty?? Help with this one.
if high idle takes a longer time to drop, it's not as rich as one which the high idle takes a lesser time to drop.
NitroWD is offline  
Old 10-08-2009, 07:55 AM
  #147  
Tech Prophet
Thread Starter
iTrader: (96)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,844
Trader Rating: 96 (100%+)
Default

Originally Posted by Racecrafter
Not in any way shape or form to discount or defame Ronnie, I think I have found an error in the tuning bible. Has this been pointed out before?

"One tell tale sign of this is if after revving up the completely warmed up engine it tends to idle fast for a few seconds then drops to lower idle speed. If you start leaning the bottom end a little at a time [then repeat the revving up and idle test] and it takes longer before the idle drops your going in the right direction.""

I find that the longer the time until high idle drops it's too rich. If idle never comes down it's too lean or needing idle adjustment.. ?


Monty?? Help with this one.
that is what he is saying , when the idle stays up in rpm then you are getting it close to proper tune with a leaner low speed , once it stays up at idle then you lower the idle rpm's until desired .


tuning is not easy , trust me . takes a while to figure it out and even then there are some mind boggling situations that you have to really use your kanoggen to figure out

the newer style cavity barrel with long needle nova carbs are even more fun
houston is offline  
Old 10-09-2009, 11:30 PM
  #148  
Tech Adept
 
Join Date: Nov 2008
Posts: 152
Default

gday there houston,sorry to bother you bud,im running in a fms at the moment in my 808.everything is going sweet as,im only on my 5th tank and at the moment im sitting at 202degrees,i was just curious about my idle,when im running it idles sweet , if i come to a complete stop the idle is pretty high,then it drops back down when i take off,i know its still very early,any tips would be appreciated,cheers,burty.
burty is offline  
Old 10-09-2009, 11:41 PM
  #149  
Tech Prophet
Thread Starter
iTrader: (96)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,844
Trader Rating: 96 (100%+)
Default

Originally Posted by burty
gday there houston,sorry to bother you bud,im running in a fms at the moment in my 808.everything is going sweet as,im only on my 5th tank and at the moment im sitting at 202degrees,i was just curious about my idle,when im running it idles sweet , if i come to a complete stop the idle is pretty high,then it drops back down when i take off,i know its still very early,any tips would be appreciated,cheers,burty.
dont eben worry about the idle at this point , you probably need to richen the low speed about 1/4 turn . big port engines love fuel and make power with it
houston is offline  
Old 10-09-2009, 11:48 PM
  #150  
Tech Adept
 
Join Date: Nov 2008
Posts: 152
Default

thanks houston,i cant wait too open this baby up,long way to go yet,whats the ideal carb setting for the fms? im running super strong 9901,41029 mugen tight short header, sorry for all the questions,
cheers burty.
burty is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.