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secretsubmariner
Champagne Wrangler
Joined: January 08, 2011
Posts: 3104
Location: Tulsa, OK
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 Posted: Thu Apr 22, 2021 12:40 pm Post subject: Re: Chronic Problem w/ "New" engine |
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What an awesome conclusion to a decade long mystery!
Super happy for you.
But what I really wanna know: what was WildThings' homebrew fix for dipstick tube? 
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-Tony
ᏣᎳᎩᎯ ᎠᏰᎵ
1978 Champagne Edition Bus FI
1970 Auto Fastback FI |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50337
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| Posted: Thu Apr 22, 2021 1:00 pm Post subject: Re: Chronic Problem w/ "New" engine |
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| secretsubmariner wrote: |
| what was WildThings' homebrew fix for dipstick tube? |
Use the search Luke |
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alman72
Samba Member
Joined: October 09, 2014
Posts: 2573
Location: MICHIGAN
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| Posted: Thu Apr 22, 2021 1:16 pm Post subject: Re: Chronic Problem w/ "New" engine |
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^lurk long enough and pay attention. just a bit of fuel line
i know you have been here for ages. surprised you did not pick that one up. |
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dr8track
Samba Member
Joined: July 18, 2005
Posts: 501
Location: Seattle area
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| Posted: Thu Apr 22, 2021 10:27 pm Post subject: Re: Chronic Problem w/ "New" engine |
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| Wildthings wrote: |
| Jet sizes by themselves tell only part of the story, to have a better idea of the jetting one also needs to know the size of the air correction jets. In general though stepping up two jet sizes (and keeping the air correction jets the same) will make a lean engine run fairly well, though if you were running so lean to begin with that you were only getting 7 MPG going only two steps richer might put you in the danger zone of running too close to stochiometric. Stoch or a bit leaner at a light cruise is fine, but with the pedal down pulling a hill you want to see richer conditions. |
How would I determine if it was stochiometric? Would this be determined by performance? Fuel consumption? If performance is the indicator what should I watch for and in what conditions? Climbing a steep hill as you mentioned?
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1974 Westfalia Deluxe Campmobiles - Lake Stevens, WA |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50337
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| Posted: Fri Apr 23, 2021 3:04 am Post subject: Re: Chronic Problem w/ "New" engine |
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| dr8track wrote: |
| Wildthings wrote: |
| Jet sizes by themselves tell only part of the story, to have a better idea of the jetting one also needs to know the size of the air correction jets. In general though stepping up two jet sizes (and keeping the air correction jets the same) will make a lean engine run fairly well, though if you were running so lean to begin with that you were only getting 7 MPG going only two steps richer might put you in the danger zone of running too close to stochiometric. Stoch or a bit leaner at a light cruise is fine, but with the pedal down pulling a hill you want to see richer conditions. |
How would I determine if it was stochiometric? Would this be determined by performance? Fuel consumption? If performance is the indicator what should I watch for and in what conditions? Climbing a steep hill as you mentioned? |
You need to have an exhaust gas analyzer to know for sure, though a head temperature sensor can give you some idea. Progressive carbs in general typically end up getting tuned too rich so lean running and head problems are not all that common running them, but since it sounds like you started out way on the lean side I would tend to be concerned about where your jetting ended up. |
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