Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 09-09-2003, 10:08 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default Dyno Help

On Friday I have a chassis dyno for one hour. What should I concentrate on first? Timing, jetting, carb spacers. I have never done this before but I want to be prepared. The motor is a 440 with 12.5:1 JE pistons Indy SR’s full port/ polish. Comp Cams solid 632/650 lift cam. Harland sharp rockers 1.6 ratio. M1 single plane intake and Race Demon 975 carb.

Any help is greatly appreciated

Thanks

Bil
Reply With Quote
  #2  
Old 09-10-2003, 11:11 AM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

Take:
A box of jets
4 hole 1" spacer
1 Hole 1" spacer

Look in the bottom of the carb, do you have a brass jet in the center of the base plate?

Where's you distributor set now...initial and total?
Reply With Quote
  #3  
Old 09-10-2003, 06:33 PM
6 packin's Avatar
6 packin 6 packin is offline
This account disabled due to bad email address!
 
Join Date: Apr 2002
Location: Under my car!
Age: 48
Posts: 1,551
Default

Do as Cuda says! That thing outa be one bad Mother F'er hu? What numbers are you looking for? Make sure you post the results ASAP! Just curious on what rearend/gear and tranny combo your running?
__________________
68 Coronet
69 Super Bee......new 500 cid comin soon!
73 Duster witha missing 440/727
Reply With Quote
  #4  
Old 09-10-2003, 07:13 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default

The tranny is a 727 with a manual valve body 8" 4500 stall Coan converter. Ford 9" with 4:33 gears. I will post info as soon as I get it.
Reply With Quote
  #5  
Old 09-11-2003, 10:21 AM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

NICE COMBO!

Make sure you get the MPH/RPM numbers so you can check the convertor slippage.

Did you look under that carb?

Is it a new carb?

Do you have it baselined?

...an hour goes by quick, be a Boy Scout..."Be Prepared"

You may even need a King Demon on that monster. Record the manifold vacuum at WOT at the top end of the pull, it should read zero, if you have vacuum the carbs too small.

I can't wait to see the numbers
Reply With Quote
  #6  
Old 09-11-2003, 01:08 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default

Thanks Cuda

I don't have a baseline. I am going to check out the carb tonight. I will have a friend with me to help. I will record the vacuum on the carb. Which port to I put the gauge on?
Reply With Quote
  #7  
Old 09-11-2003, 01:26 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default

Hey Cuda,

Just looked at the carb. I turned it over and did not see any kind of brass jet under it. Is it visible without removing the bottom plate? What is it?
Reply With Quote
  #8  
Old 09-12-2003, 11:15 AM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

OK you don't have the King Demon, it's the Race Demon 4150 base.

On the King Demon's there is a jet in the center which is a circuit that they drilled to pull air into the the motor from above the throttle plates. You can drill or replace it with different size jets to add more air on the idle circuits...just another way of fine tuning a King Demon to get the max out of it.
Reply With Quote
  #9  
Old 09-12-2003, 07:09 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default

An hour sure does go fast on a dyno. The first full pull was 436.3 HP/452.5 TQ.
Second pull was 438HP/445.3TQ. Third pull was 445.1 HP/394 TQ. Fourth pull was 438.8 HP /475.2 TQ.
Reply With Quote
  #10  
Old 09-13-2003, 12:11 PM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

So what did you do between pulls????

Numbers look dam good, I presume that was rear wheel numbers?
Reply With Quote
  #11  
Old 09-13-2003, 06:24 PM
440dart_72's Avatar
440dart_72 440dart_72 is offline
Inactive User
 
Join Date: Apr 2001
Location: cleveland, oh
Age: 49
Posts: 136
Default

Run #1 38* timing Stock jets 1/2 open spacer.
Run #2 Same but timing change to 35*
Run #3 1" 4 hole spacer 35* timing
Run #4 Same with 38* timing.
My last run the A/F mixture was leaning out. I didn't have enough time to change jets.

I don't know if this is true or not, But the guy that was operating the dyno said that my mph was not true to what my papers said. He said that due to the high stall, that the MPH would be off. I don't know how to find out my converter efficiency. These are rear wheel numbers. I hope i can get more out of the car.
Reply With Quote
  #12  
Old 09-15-2003, 11:09 AM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

Quote:
Run #3 1" 4 hole spacer 35* timing

See...See!! I keep telling you guy's 34-35* of timing and a 1" 4 hole is optimal for the average street strip, moderate compression, flat top piston Mopar......LOL

Convertor efficiency test:

Run it through the 1/4 mile and record your tach reading

Then go to http://www.prestage.com/Car+Math/Gea...M/default.aspx

This will give you the direct no slip RPM at the stripe based on your specs, the difference between what your tach read and the true RPM is the convertor slippage, it should be between 3.5 and 6% if it's a real good convertor.

Anything over 8% and I'd sell it on Ebay...LOL
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dyno in KS or CO? michaelb Performance Talk 8 05-05-2004 11:52 AM
dyno help 440dart_72 Drag Racing Forum 2 09-12-2003 07:10 PM
dyno max TurboXT Front Wheel Drive Chat 1 03-28-2002 01:13 AM
DFW dyno day.... TxDieselKid Diesel & Turbo Diesel Chat 1 12-25-2001 12:15 PM
Dyno #'s Supercharged5.9R/T Dakota Truck Forum 12 01-29-2001 05:27 AM




All times are GMT -4. The time now is 08:40 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .