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Mal evolent
Samba Member
Joined: March 31, 2009
Posts: 2912
Location: San Antonio, Nuevo Mexico
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 Posted: Fri Feb 14, 2014 8:09 pm Post subject: Is this rings that did not seat? |
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1776 built in 2009 by a retired VW shop owner. fouls out the plugs in about an hour. 85 PSI in all 4 cylinders. main jets 112.5, wideband sensor shows 12.5 AFM at idle and 14.7 at RPM
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73 Beetle Baja, Ghia front brakes, Type 3 rear brakes, 2220 ( 94 X 80 ), Weber Progressive, Bosch SVDA, '97 Mustang seats
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808OvalGreasemonkey
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Joined: September 22, 2010
Posts: 763
Location: Oahu
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| Posted: Fri Feb 14, 2014 8:34 pm Post subject: |
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| 14.7 @ full load is too lean. Do a leak down test. |
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mcmscott
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Joined: March 12, 2010
Posts: 4858
Location: sanger ca
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| Posted: Fri Feb 14, 2014 8:46 pm Post subject: |
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85 pounds cranking ?= bad combination. Unless it is blowing blue smoke out the pipe and dripping oil out, then it might be the rings.
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Mal evolent
Samba Member
Joined: March 31, 2009
Posts: 2912
Location: San Antonio, Nuevo Mexico
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| Posted: Fri Feb 14, 2014 9:10 pm Post subject: |
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| Quote: |
| 14.7 @ full load is too lean. |
no load, it barely idles. fouls brand new plugs in seconds. but no blue smoke, plenty black smoke
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clonebug
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Joined: January 29, 2005
Posts: 4028
Location: NW Washington
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| Posted: Fri Feb 14, 2014 10:19 pm Post subject: |
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I ran a 1600 DP for at least 3 yrs at 90 lbs compression and then turboed it for a year without problems.
I quit using it because it developed a crack in the case behind the flywheel at #3 cylinder.
I never had any problems with how it ran...just that the crack was a half an inch away from the oil gallery.
Try a hotter set of plugs.
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kadub
Samba Member
Joined: November 04, 2004
Posts: 444
Location: Auburn, Wa
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| Posted: Sat Feb 15, 2014 8:44 am Post subject: |
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If it's blowing black smoke, sounds like excess fuel. How's your spark strength from the coil? Rest of your ignition system in good shape? If it's misfiring at idle it'll read lean due to the unburned oxygen even if it's blowing fuel out the tailpipe. Cylinders could be washed with fuel giving poor ring seal and low compression readings. Any idea of cam and CR? Could be a tall deck low CR "oldschool" build. What plugs are you using now?
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Mal evolent
Samba Member
Joined: March 31, 2009
Posts: 2912
Location: San Antonio, Nuevo Mexico
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| Posted: Sat Feb 15, 2014 9:37 am Post subject: |
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| Quote: |
| If it's blowing black smoke, sounds like excess fuel. |
112.5 is the smallest main jet made. can't go leaner. tried 3 Solex 34s with the same results.
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| How's your spark strength from the coil? Rest of your ignition system in good shape? |
35,000 volts, jumps a 1" gap in my tester
| Quote: |
| Any idea of cam and CR? |
W110 & 8:1
Field elevation: 4600 feet.
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kadub
Samba Member
Joined: November 04, 2004
Posts: 444
Location: Auburn, Wa
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| Posted: Sat Feb 15, 2014 9:28 pm Post subject: |
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Your main jet should not be a factor at idle, right? Three carbs with same results, have you checked your fuel pressure? Can you look down the carb and see if it's just pouring fuel out of the float bowl vent down the barrel? 8:1 is pretty low CR for a 110 at that altitude. Not likely causing any problems other than limiting power a little.
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75smith
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Joined: July 09, 2011
Posts: 2275
Location: NH
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| Posted: Sat Feb 15, 2014 10:59 pm Post subject: |
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how many miles/hours on the engine? what have you actually done? removed heads to verify CR, etc? have you tested whole ignition circuit? could be flat lobes on the distributor, but that should be something you can pick up when checking point gap
no offense but its like you want us to solve a 100 piece puzzle with only 50 pieces
what are the actual specs, like distributor, timing, heads, intake(sounds like single 34pict-3?)
how are the idle jets, and idle screw? main jets not really an issue until 3500 with no load, and you sound like you contradicted yourself
| Mal evolent wrote: |
| 12.5 AFM at idle and 14.7 at RPM |
| Mal evolent wrote: |
| no load, it barely idles. fouls brand new plugs in seconds. |
and again
| Mal evolent wrote: |
| fouls out the plugs in about an hour. |
so a little more information, its okay to type, unless it hurts your fingers...
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