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Author Topic:   tuning a fresh motor...
MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 07-07-2002 02:44 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
I'm gonna be home for a week here soon and plan to tune my engine as best I can during this time and hopefully DRIVE THE CAR at last. The motor is new, I ran it for 30 minutes to break in the cam then changed the oil. I've not fooled with the carb. (Bigs 650) nor the timing. After I broke in the cam I dropped the rpms down to see if it would idle and it wouldn't, it bogged down and quit at around 1100 rpms. I haven't been around to fire it up since.

Here's what I want to accomplish:
-Get the motor to idle nicely at around 800-900 rpms
-Set the idle mixture w/ vacuum gauge
-Check the initial and total timing, adjust if necessary.

Here's what I need to know:
-Where do I hook up the vacuum gauge? I have an RPM airgap intake on this 289.
-Is this the correct procedure for checking my timing?: Find TDC, hook up timing light, start motor and check initial timing at idle, rev it up to about 4000 rpms to check the total timing? If my memory serves me, the engine builder set the initial at 14* and the MSD distributor has a 21* bushing in it for a total of 35*.
-Any other tips for getting the idle speed and mixture set, I've never tuned a Holley carb. All I've done is read a book on tuning them.

Thanks.

------------------
Matt Fraley
1966 Mustang Coupe; 289, T-5, 9" 3.50
http://mdf99.tripod.ca/289_Side.jpg

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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 07-07-2002 03:03 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
Also, to find TDC I was going to get the comp cams piston stop tool that you screw into the spark plug hole. It has a 14mm thread size, do AFR 185 heads use 14mm spark plugs?

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 07-07-2002 04:18 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
What do you have in the engine for cam and compression ratio?

You want to take a vacuum reading from a direct manifold source, like the baseplate if your manifold doesn't have a vacuum port.

------------------
'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
Pics

MCA Member # 47773

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-07-2002 04:41 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Matt,

To find tdc, use your piston stop and with all plugs removed turn the engine around until it stops then mark the spot, and turn it around the other way til it stops and mark the spot again. TDC is centered between your two marks. If your damper doesn't have the marks out to 40+ btdc then buy a timing tape and put it on your damper. Don't run the vacumm advance, make it all centrifical advance. 14-35 sounds fine, have it all come in by 3000 rpms or so. To do that you'll have to use lighter springs on the centrifical advance's weights.

To tune the carb hook your vac gauge to manifold vacumm. I use the pcv hose and shove the vac gauges tube into it (works for me). Adjust the idle screws equally until you see max vacumm, the idle rpm will increase too, so readjust your idle speed and do it again looking for max vacumm. Recheck your initial timing and idle speed and the readjust the idle screws again for max. vacumm. That should do it, unless you have a vacumm leak. Good luck and keep us posted. Can you repost the pic of your engine with its specs for others to see?

SteveW

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-07-2002 04:44 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Matt,

Also, after you broke in your cam did you readjust the valve lash? It is a solid lifter cam isn't it? If you didn't, now is the time, after you warm up the engine of course.

SteveW

[This message has been edited by steve'66 (edited 07-07-2002).]

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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 07-07-2002 05:15 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
Here's a pic of the motor:

289 .030 over, stock crank and rods, main studs, milodon pan and windage tray, Bigs 650 double pumper mechanical w/ no choke, RPM Airgap intake, AFR 185 heads, Comp solid 236/242 @ .050, .536/.544 Lift 108 sep., KB Hypers 10.5:1 (I pray they don't disenegrate anytime soon!) MSD box, distributor & coil. Hooker supercomps.

Nope, I haven't reset the valve lash SteveW. Should I do that first?

Thanks!

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 07-07-2002 05:21 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
The first thing you should do is make sure it's not running lean and be conservative on the timing due to the hypereutectics.

Then yes, the valve lash is next.

Nice looking engine!

------------------
'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
Pics

MCA Member # 47773

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-07-2002 05:41 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Matt,

What SteveL said!

The KB's will be fine for what you're doing, don't worry about them unless you drop a valve.

Beautifull 289 BTW!

SteveW

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 07-07-2002 06:05 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Matt that engine is a work of art.Very good looking.

SCOOP

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65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Crager SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 07-08-2002 08:13 AM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
I remember screwing two plugs into the intake, one of those should work for the vacuum source. I'll replace a plug with a hose nipple and should be good to go.

I don't think the motor is running lean, when I first started it up, the temp came up to 185* and held steady right there. If it was really lean it would have been hotter than that wouldn't it? I don't recall the jetting on the carb right now but Bigs should have me close.

SteveL, when you say be conservative w/ the timing does that mean not to advance it too much? What range should I stay within?

Thanks guys!

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JAAZZY
Gearhead

Posts: 836
From: Bay Area, CA
Registered: Apr 2001

posted 07-08-2002 11:42 AM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
8 inital would be conservative and it will still run good. My 289 ran best with 10 initial but I had forged pistons.

Nice looking motor.

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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 07-08-2002 01:00 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
In order to retard my initial timing by a few degrees, I turn the distributor in a clockwise direction while the engine idles, correct?

Will I then need to put a different advance stop bushing in the distributor that allows more centrifugal advance to make up for it? What should my total timing be?

Thanks!

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 07-08-2002 06:30 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
To be safe, I think I'd keep it at 32-34 degrees total at maximum.

------------------
'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
Pics

MCA Member # 47773

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