PennMustangs  
Old 01-27-2013, 10:06 AM   #1
TCR racer
Member
 
TCR racer's Avatar
 
Join Date: Oct 2009
Location: Punxsy Pa
Posts: 94
stock 5.0L Optimum timing

Hello I'm going to be dinking around with a stock 85 5.0 with a Performer intake and a set of cheap long tube headers, it probably running on 92 pump gas or maybe e-85 but don't think this motor will have enough compression to run the "corn" worth a darn. I'm going to use a billit MSD and 6Al with locked timing (no curve). This is a strip only car with the following set up so far - c-4, 3000 converter, 4.10 gear(don't have yet), 26" tire, stripped out pretty well (so far have removed approx 265 lbs from the car), Probably going to have a 650 or 750 holley DP on it (don't have yet either). This is going to be a simple (slow) foot brake type car, hoping to see a high 13 second ET?

...so have any recomendations of what timing to start out with ? Being a chevy guy I'm thinking start out around 34 and see what it likes?

How about a plug recomendation for this motor?

sorry for all the dumb questions
TCR racer is offline   Reply With Quote
Old 01-27-2013, 10:44 AM   #2
SlowGT
Moderator
 
Join Date: Oct 2007
Location: Columbia Co, PA
Posts: 2,134
sorry i don't have much to offer on timing advice for your setup. however, i'm prettty sure using 92 octane will be a waste of hard earned money. and although i'm not very well versed in carb world, i'm thinking a 600 on a stock 5.0 would be plenty.
__________________
95 GT - 428w...coming soon to a redlight near you
95 Cobra R - #73...stock, 6128 miles
95 GT vert - stock...Numidia Friday Night Street Legals Champion...Jun 22, 2007
http://www.pennmustangs.com/forums/image.php?type=sigpic&userid=704&dateline=1192371242
SlowGT is offline   Reply With Quote
Old 01-27-2013, 04:15 PM   #3
skip
Moderator
 
Join Date: Jun 2006
Location: Chambersburg PA
Posts: 4,627
When I first went with a stock long block and used a 650 double pumper I couldn't get the thing to lean out. Even with lower jets it was way to much. It burnt your eyes and it was real rich. I finally got a set of Performer RPM heads and F cam. Then the carb was just about right. Never to big or to small then. I had my timing on both be total between 34-36!!!
__________________
If you are what you eat I'm fast, cheap, and easy !!!
Ladies if you want to make your man happy shake your butt like it has the hiccups

Wasting my time going 11's at 127 MPH.

skip is offline   Reply With Quote
Old 01-27-2013, 10:36 PM   #4
Shifter
Senior Member
 
Join Date: Oct 2006
Location: Pocono's
Posts: 3,480
Start with 30* timing and go up til it detonates or slows down my bet is that it will like 32/34 but that depends on if the balancer is correct.
Run 92/93 octane fuel, just keep it consistent.

On a foot brake auto car with that low of stall I'd do a 650 mechanical or 750 vacuum. Also an annular booster carb will help it. An even smaller carb like a 600 mechanical may be easier to tune.
Depends on your knowledge of carb theory.....

I've done what you're doing a lot.

---------- Post added at 10:36 PM ---------- Previous post was at 10:35 PM ----------

For plugs just use a stock range auto lite or go one range colder. Nothing fancy...
__________________

1984 GT - 363/c4, street legal-pump gas
Shifter is offline   Reply With Quote
Old 05-06-2013, 08:07 PM   #5
TCR racer
Member
 
TCR racer's Avatar
 
Join Date: Oct 2009
Location: Punxsy Pa
Posts: 94
Quote:
Start with 30* timing and go up til it detonates or slows down my bet is that it will like 32/34 but that depends on if the balancer is correct.
Run 92/93 octane fuel, just keep it consistent.

On a foot brake auto car with that low of stall I'd do a 650 mechanical or 750 vacuum. Also an annular booster carb will help it. An even smaller carb like a 600 mechanical may be easier to tune.
Thanks for the tips so far a little quicker than I expected but here is what we ended up with.
We removed over 300 lbs off the car, so I'm guessing its around 3000lbs, plus the driver which last weekend was a pretty big boy (guessing around 300lbs).

Finally got it running, we started with 32* Locked timing - no curve, 93 octane pump gas, dual plane Edelbrock 289 intake with 4 hole spacer setting on it with the 2 halves of the intake sealed from each other, 4777 (straight leg booster)650 carb with jet extensions (had to lean it down 3.5 sizes so far and still a little fat up top) but idles very clean and has great throttle responds (running a Power valve in the front right now because it seems to be working pretty well so far, but want to plug the PV after a little more tuning and see if it likes that), cheap set of used long tube headers, approx. 24" of 3" pipe and 3" Bullet type mufflers with a little turn down in the end(nice and quite), electric water pump, a 10" Hughes "advertised" 4000 stall in the plain jane stock C-4 tranny. We are running 10w40 motor oil (whatever the stick needs to be in the middle) - but I believe its approx. 5.5 quart.
Stage at 180* water temp, at 1900Rpm, shift at 5000 - 5200 with 3.73 gears with a 26" tire. Car is dead hooking - of course its not leaving very quick with a 1.69 60' time, but went a best of 13.37 at 97mph in some pretty good air last Saturday night. I didn't get to verify the timing marks - just going to play around and see what it likes.
I'm reasonably happy with that ET (would like to make the roll out a little quicker for foot braking) but does anyone see anything obvious that I'm missing to get a little more Et or Mph out of it - besides diving into the motor?
thanks Steve

Last edited by TCR racer; 05-06-2013 at 08:19 PM.
TCR racer is offline   Reply With Quote
Old 05-06-2013, 09:50 PM   #6
Shifter
Senior Member
 
Join Date: Oct 2006
Location: Pocono's
Posts: 3,480
Stock headed car going 13.30's ain't bad man!
__________________

1984 GT - 363/c4, street legal-pump gas
Shifter is offline   Reply With Quote
Old 05-08-2013, 09:09 PM   #7
TCR racer
Member
 
TCR racer's Avatar
 
Join Date: Oct 2009
Location: Punxsy Pa
Posts: 94
Quote:
Stock headed car going 13.30's ain't bad man!
Thank you, like I said I'm reasonably happy with lower 13s in pretty good air. It's just that there were several ford people that kept telling me about there stock 5.0 running in the 12s , and its going to be a lot faster than you expect it to be.bla bla bla , just wanted to see if I was missing something obvious.

We raced a young lady last weekend with almost the same car with a lightly modified 302 same gears and a little larger slick that ours 3rd round last week, and really surprised me that we were 4 tenths quicker than they were, although we took a good bit of weight off over the winter, the driver last week was over 300lbs and the young Lady that was driving the other car couldn't been much over 100lbs soaking wet, so we were probably close on weight.

thanks for your tuning input- I appreciate it, it kind of reinforced what I thought, but wanted to get some input from someone more familiar with the 5.0 than I am.
TCR racer is offline   Reply With Quote
Reply

Thread Tools

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
timing help nintygt 5.0/5.8 Tech 3 07-19-2011 08:34 PM
timing help? RsStang 5.0/5.8 Tech 13 07-01-2010 08:46 PM
timing retard or not ? kingd91fox 5.0/5.8 Tech 10 05-13-2008 09:17 PM
Timing skielk 5.0/5.8 Tech 8 03-12-2008 08:54 AM
86-93 Stock Fuel Rails, with Stock Reg. 86mustang408w Fuel System & Related 1 02-20-2007 08:41 PM


All times are GMT -5. The time now is 06:16 PM.


Powered by vBulletin®
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Designed By vBInspired.com
2017 PennMustangs, LLC