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Re: ubly results
[Re: EDDIEB]
#745371
07/12/10 05:57 PM
07/12/10 05:57 PM
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Joined: Mar 2009
Posts: 2,469
Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,469
Sydney,Australia
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Dave,my plugs ran the same light colour.had it jetted for max MPH,carb sealed to scoop.with a BG 825
went up from a 3.5 to a 5.5 PV got more colour and picked up 60' and ET.no MPH ?
this a full street and strip car
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: ubly results
[Re: mopar dave]
#745374
07/13/10 12:22 PM
07/13/10 12:22 PM
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Joined: Jan 2003
Posts: 4,743
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,743
Moved to N.E. Tennessee
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I think you are placing way too much importance on the color of the porcellin. Unleaded pump gas does not discolor the porcellin very much if at all. If you expect to read WOT mixture from the porcellin it is clear down at the very bottom and will require a lighted magnifier to see. There are many obsolete articles on the internet about plug reading. Even some of the better articles disagree on the proper things to look at for jetting, timeing and heatrange. Here are a couple worth reading. http://www.angelfire.com/fl4/pontiacdude428/Readplugs.html http://cochise.uia.net/pkelley2/sparkplugreading.htmlIf you are at the track I think you should just jet for mph. Check the plugs to help determine if jet stagger is needed, timing is correct and to check for detonation damage.
Last edited by GomangoCuda; 07/13/10 12:30 PM.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: ubly results
[Re: mopar dave]
#745375
07/13/10 01:37 PM
07/13/10 01:37 PM
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Joined: Dec 2009
Posts: 1,074
detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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Quote:
off the trailer car went 2 tenths and 2 mph slower. changed carb spacer to a 1" open from a 4 hole tappered and picked up .5 mph in 1/4 but lost .5 in the 1/8 with same et. changed jetting to 87/96 from 86/94 ran almost identicle et/mph. carb seems insensitive to jet changes,so i put 90/98 jets in and lost 2 mph and one tenth,but put some color on plug,grey. plugs have been white up to this point. ran into EDDIEB there,great guy. he suggested smaller high speed air bleeds,i agree. fuel pressure thru the traps was 7psi. any ideas?
How does ubly compare to milan? nice track?
Is it always packed?
I have always wanted to go there, but the last time I planned it, I blew my trans. 
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Re: ubly results
[Re: POS Dakota]
#745378
07/13/10 02:22 PM
07/13/10 02:22 PM
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Joined: Jan 2003
Posts: 4,743
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,743
Moved to N.E. Tennessee
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just a thought. Are the needle and seat or passages big enough to supply 2 jets that big? That would be one possible explanation for the carb not responding to jet changes.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: ubly results
[Re: POS Dakota]
#745379
07/13/10 02:37 PM
07/13/10 02:37 PM
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Joined: Jun 2009
Posts: 705
Michigan
Hemiroid
super stock
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super stock
Joined: Jun 2009
Posts: 705
Michigan
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Quote:
Quote:
off the trailer car went 2 tenths and 2 mph slower. changed carb spacer to a 1" open from a 4 hole tappered and picked up .5 mph in 1/4 but lost .5 in the 1/8 with same et. changed jetting to 87/96 from 86/94 ran almost identicle et/mph. carb seems insensitive to jet changes,so i put 90/98 jets in and lost 2 mph and one tenth,but put some color on plug,grey. plugs have been white up to this point. ran into EDDIEB there,great guy. he suggested smaller high speed air bleeds,i agree. fuel pressure thru the traps was 7psi. any ideas?
How does ubly compare to milan? nice track?
Is it always packed?
I have always wanted to go there, but the last time I planned it, I blew my trans.
Ubly doesn't really compare to Milan at all. Milan is a much better track by far IMO.
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Re: ubly results
[Re: mopar dave]
#745381
07/14/10 01:25 PM
07/14/10 01:25 PM
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Joined: Jan 2007
Posts: 8,043
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,043
Mt Morris Michigan
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thanks tex013 for the suggestion on the pv switch,your right. pics are dark,plugs not that dark in color.
heres another.
Last edited by mopar dave; 07/14/10 01:27 PM.
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Re: ubly results
[Re: mopar dave]
#745382
07/14/10 04:40 PM
07/14/10 04:40 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Dave, that plug is damn near fouled from what i see, You need to read the "base" of the threads for jetting, your running rich (even from the 1st. set of pix), if you get a black dry soot from the flat part of the threads end, its rich, you want a complete burn all around it, but more of a dark brown, You need to jet it "DOWN" in the summer heat & thick air, you jet up in the fall, but you always try & achieve "best" MPH either way.
If you look at those 1st. set of plugs, the porcelin is not white, at least from what i see, there perfect if you ask me, they are light tan, i would try jetting down 2 & 2 from your base jetting before you went up & see what it does.
Last edited by joedust451; 07/14/10 04:44 PM.
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