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Troubles getting timing set on 360
#1227175
05/04/12 04:04 PM
05/04/12 04:04 PM
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko
OP
I Live Here
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OP
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
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So, many of you recommended that I set the initial (idle) timing on my 360 in order to better diagnose the rough idle problems I'm having... I tried doing that today, and seem to be either completely stupid, or having some other problems. I have a timing light that has a dial on it...
I hooked up the timing light to the #1 plug wire, as close to the boot as possible, and then get the car to idle (around 1000 rpm). disconnected and plugged the vacuum line that goes to the vac advance on the distributor. When I set the dial on the timing light to 16 (what I've been told to set my idle timing to), and rotate the distributor until the timing mark on the balancer line up at 0 on the water pump, the timing mark doesn't seem to be there on "every" flash of the timing gun... is there something else going on? Also, is this the proper way to set the initial timing where it needs to be?
Also, just to set my baseline, I make sure all my spark plugs (autolite AL65) were set to .034, and set each idle mixture screw on the carb (Edelbrock 1405) to 1.5 turns out.
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Re: Troubles getting timing set on 360
[Re: RobX4406]
#1227182
05/04/12 10:50 PM
05/04/12 10:50 PM
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko
OP
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OP
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
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So, I realized that the vacuum port on the back of the carb that was going to the power brake booster was not a 'solid' fitting, it was a brass fitting that was meant to be pressure fit on the inside.. it was 2 pieces.. the nipple part and the nut part that had the threads on it to screw into the carb body... and it was wobbly.. so it was clearly a source of vacuum leak. I went out and got a solid 1 piece brass fitting and took your advice, and plugged it off for the sake of the tuning process. I blocked off the vacuum port going to the distributor too. I am wondering if something else is going on ...because even when I move the timing to 18 degrees at idle, it barely wanted to idle at 900 rpm. Then, when I revved it up, it would go up to about 38 degrees advance.
when I hooked up the vacuum advance back to the distributor, the idle timing jumped up to about 38 at idle, and when revving, it went all the way up to about 55 degrees. How is that possible?
I freaking hate this crap. I'll take body and paint work over this any day. I shoulda just dropped a Mustang 5.0 in the Miata and been done!
Think I may put a posting up on Craigslist looking for someone who knows how to tune Mopar engines in the Sacramento area, and see if I can get someone local to do it for me.
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Re: Troubles getting timing set on 360
[Re: stumpy]
#1227184
05/04/12 11:22 PM
05/04/12 11:22 PM
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko
OP
I Live Here
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OP
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
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Quote:
Is the vacuum port you are using for the advance ported or full? Pvacuum is above the butterflys and full vacuum is below. You want ported for advance.
Yeah, it's ported vacuum.
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Re: Troubles getting timing set on 360
[Re: cal_gecko]
#1227186
05/04/12 11:27 PM
05/04/12 11:27 PM
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Joined: Feb 2004
Posts: 1,012
indiana
mcmopars
super stock
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super stock
Joined: Feb 2004
Posts: 1,012
indiana
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Quote:
So, I realized that the vacuum port on the back of the carb that was going to the power brake booster was not a 'solid' fitting, it was a brass fitting that was meant to be pressure fit on the inside.. it was 2 pieces.. the nipple part and the nut part that had the threads on it to screw into the carb body... and it was wobbly.. so it was clearly a source of vacuum leak. I went out and got a solid 1 piece brass fitting and took your advice, and plugged it off for the sake of the tuning process. I blocked off the vacuum port going to the distributor too. I am wondering if something else is going on ...because even when I move the timing to 18 degrees at idle, it barely wanted to idle at 900 rpm. Then, when I revved it up, it would go up to about 38 degrees advance.
when I hooked up the vacuum advance back to the distributor, the idle timing jumped up to about 38 at idle, and when revving, it went all the way up to about 55 degrees. How is that possible?
I freaking hate this crap. I'll take body and paint work over this any day. I shoulda just dropped a Mustang 5.0 in the Miata and been done!
Think I may put a posting up on Craigslist looking for someone who knows how to tune Mopar engines in the Sacramento area, and see if I can get someone local to do it for me.
a ford? whats up with that.this is a mopar site,sounds like basic troubleshooting to me,reguardless of brand. so you think just drop in a 5.0 and all your mech. issues are over.wow
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Re: Troubles getting timing set on 360
[Re: cal_gecko]
#1227188
05/05/12 12:13 AM
05/05/12 12:13 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
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Posts: 12,271
Overpriced Housing Central
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Do you have this plate under the carb?  It sounds better. You're getting closer. If you turn the idle screws in does the idle quality change? It sounds like it's got a miss in it, might be the video itself. What's the line all the way across on the timing tape in your video?
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Re: Troubles getting timing set on 360
[Re: cal_gecko]
#1227191
05/05/12 12:25 AM
05/05/12 12:25 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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you need the piece that is shown above to seal the deal...
that part comes with the performer intake from edelbrock for a reason..
Last edited by 70AARcuda; 05/05/12 12:27 AM.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Troubles getting timing set on 360
[Re: cal_gecko]
#1227192
05/05/12 12:29 AM
05/05/12 12:29 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
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Posts: 12,271
Overpriced Housing Central
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Quote:
No, I've got the carb bolted directly to the intake (with a gasket in between).. It's a Performer intake and a Performer carb, I was under the impression that I wouldn't need anything other than the gasket between them. It is getting better.. but it's still not right. This is exceptionally frustrating. I'm having a cocktail now.
That intake carb combo needs that plate. It's the hourglass shape question I asked earlier.
See instructions, bottom of page 3.
http://static.summitracing.com/global/images/instructions/edl-2176.pdf
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Re: Troubles getting timing set on 360
[Re: 70AARcuda]
#1227193
05/05/12 12:31 AM
05/05/12 12:31 AM
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Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko
OP
I Live Here
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OP
I Live Here
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
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Quote:
you need the piece that is shown above to seal the deal...
that part comes with the performer intake from edelbrock for a reason..
That's what I get for buying the intake and carb "used" ... I'll see if I can get that part. I was using a 1" spacer to help reduce heat soak to the carb, but I got rid of it in an effort to reduce vacuum leaks.
Also, to the question about the line across the timing tape on the video.. i think that's just an anomaly with the frame rate of the video and frequency of the flash from the timing light.
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Re: Troubles getting timing set on 360
[Re: cal_gecko]
#1227194
05/05/12 12:36 AM
05/05/12 12:36 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
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Posts: 12,271
Overpriced Housing Central
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Those plates are about $7 at O'rielly's or autozone IIRC. They tend to get "lost"...  That 1" spacer may do the same, however, it introduces other potential issues. Get that plate #2732 and try again. Reset the carb idle mix screws to 1.5 turns out. If you get the plate on, the idle should increase a bunch because your leak should be gone.
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