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what fuel mileage

Old October 26th, 2016, 02:24 PM
  #121  
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Agreed, 28 degrees at 3,600 RPM is a bit low.

Also, you may want to make it max out there by 3,000 or even 2,500 (whichever works best), which may require different advance springs.

- Eric
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Old October 26th, 2016, 03:06 PM
  #122  
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I'll bring initial up to 32 or so with Vac connected @ idle and see what that gives me @ 3000 and 3600 and then at 4200 to see if my limiter is set correctly.
I also need to adjust the carb and see if I can get the vacuum up some. 7 "hg at idle is a bit low. 16 at power is ok but it would be nice to get that up some also
Thanks again guys for your suggestions
Jerry
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Old October 26th, 2016, 03:39 PM
  #123  
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Originally Posted by My2nd 69 442 View Post
Well Guys I got to a little playing with my 442 today. 400 CID G block w/HEI ignition
Changed plugs R 45 S gaped to .045 an did a compression check as follows
#1 148 #2 145
#3 140 #4 135 - this may be an issue
#5 140 #6 145
#7 140 #8 140

Checked/Set timing to 14* @ 650 28* @3600 No Vacuum
26* @ 700 & 46* @3600 with Vacuum connected 1* timing increase at most above 4000.

You should have the same advance difference at idle as you do at 3600. Is your stop binding?

Does anyone see any issue with what I have or any suggestions to improve performance
Thanks,
Jerry
I would add 5/6* at idle.
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Old October 26th, 2016, 03:42 PM
  #124  
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Originally Posted by My2nd 69 442 View Post
I'll bring initial up to 32 or so with Vac connected @ idle
Try setting the initial without the vacuum advance connected - it's just a vacuum line so it's simple to disconnect while setting the timing. The issue I see is that when the ignition advance increases, the vacuum signal also increases, which will increase the advance, so this could mean you really don't know how much advance you are getting from from initial vs. vacuum if you have the advance can connected.

Last edited by Fun71; October 26th, 2016 at 03:45 PM.
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Old October 26th, 2016, 06:18 PM
  #125  
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Thanks Eric and Kenneth
Sometimes what I mean in my head doesn't equal what I type.
I always set the timing with the vac disconnected and plugged(usually with my Vac gauge)
Then after setting I connect Dist vac and read what I have and that's what I record.
I need to get my idle vacuum up at idle.
I don't think the vac can has enough vacuum at idle(7"hg) to give me full idle advance when connected. Then it seems to be pull the dist advance good at power(16"hg)
I'm hoping a better idle mixture will bring the idle vacuum up a little.
Maybe your thoughts on this?
Thanks
Jerry
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Old October 26th, 2016, 07:02 PM
  #126  
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This is where the adjustable vac cans work well.
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Old October 26th, 2016, 07:30 PM
  #127  
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Eric
I will recheck #4 cyl tomorrow. Hopefully it'll come up at least to 140. Maybe I didn't have the adapter screwed in good. I have some concern about it being 5lbs lower
Jerry
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Old October 26th, 2016, 08:25 PM
  #128  
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I wouldn't worry about the 135psi reading in #4.

The standard acceptable variation is +/-10%.
140/10=14psi
140-14=126psi

You've got 4 cylinders at 140, 2 at 145, 1 at 148, and 1 at 135.
Even the two farthest outliers (135 and 148) are 13psi away from each other, which is less than 10% of the 140psi of most of the cylinders.

Get your timing tuned in, don't go chasing phantoms.

- Eric
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Old October 26th, 2016, 08:30 PM
  #129  
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Oh hell Eric you are taking away one more thing not to worry about. Pretty soon your guys are gonna make me so stress free I don't know if I can handle it.
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Old October 27th, 2016, 03:52 AM
  #130  
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I was just saying that #4 eventually may be a problem down the road or as Jerry stated, it was a faulty test.
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Old October 27th, 2016, 11:47 AM
  #131  
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Ok guys I did some further checking/adjusting this morning and this is what I currently have:
Idle at 650 Vac disconnected set to 20* 7"hg @ idle
3600 Vac disconnected 34* 16"hg @3600
Reconnected Vac
adj idle down to 650 w/vac advance 34*
@ 3600 w/vac connected 48*
maybe 1* increase at 4200 but then immediately settled back to 48*
Readjusted idle to 850 to make AC happy
Took car out for test drive it has a very slight stumble on initial kick in the but clears up immediately
idle mixture screws are 2 3/4 turns out
Rechecked compression #4 cyl now @ 138 not much gain but I'm not gonna concern myself with it(thanks Eric)
Overall car now seems to be happy so it's gonna live with these settings for now
Thanks Eric, Eric and Kenneth for your advice
Jerry
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Old October 27th, 2016, 11:49 AM
  #132  
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Glad we were able to help you!

- Eric
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Old October 27th, 2016, 04:14 PM
  #133  
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Glad you got it, those settings look good. It ought to run like a raped ape now.
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Old October 27th, 2016, 08:44 PM
  #134  
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I really want to thank everyone who have guided me thru this but especially Eric, Eric and Kenneth.
It's been special for me to have your help and guidance.
I believe it's time to put this thread to bed.
The car ran really well today and Eric you are right, It does run like a raped ape and it pulls great thru the gears. So guys, I gotta say "we got this"
I wish you all the best and
Thank you,
Jerry
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