 Carb Tuning and CA gas |
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| yeahmag |
 Oct 9 2017, 09:30 PM
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#1
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Advanced Member  Group: Members Posts: 2,443 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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Well, another milestone has been passed. I started my journey with Dell's here in CA with the standard 60 idle jet (mind you I've been running Dells for over 20 years) Over the years (and different motors) I've slowly crept up. 62's in the early 2000's. 65's in 2010 or so... Today, tuning the 914 after my 3 year build, 70's! Yup... you heard right - 70!!! The same motor 3 years ago ran a 65.
I couldn't believe it myself. My LM-1 is acting up, so I couldn't verify my AFR, but I even rebuilt the carbs first. It went for snapping and popping out the exhaust, a stumble in transition, and the mixture screws not responding "cleanly" to clean low end and a nice "report" from the mixture screws. I'll be picking up a new O2 sensor to see where it landed... 2056cc 2L heads cleaned up 86A cam 9.5: CR 4-1 header with Phase 9 muffler 40 Dellorto DRLA: 200 Air, 145 main, 70 idle Welcome to 10% ethanol oxygenated fuel... -Aaron |
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| stugray |
Oct 9 2017, 09:50 PM
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#2
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE(yeahmag @ Oct 9 2017, 08:30 PM)  Well, another milestone has been passed. I started my journey with Dell's here in CA with the standard 60 idle jet (mind you I've been running Dells for over 20 years) Over the years (and different motors) I've slowly crept up. 62's in the early 2000's. 65's in 2010 or so... Today, tuning the 914 after my 3 year build, 70's! Yup... you heard right - 70!!! The same motor 3 years ago ran a 65. I couldn't believe it myself. My LM-1 is acting up, so I couldn't verify my AFR, but I even rebuilt the carbs first. It went for snapping and popping out the exhaust, a stumble in transition, and the mixture screws not responding "cleanly" to clean low end and a nice "report" from the mixture screws. I'll be picking up a new O2 sensor to see where it landed... 2056cc 2L heads cleaned up 86A cam 9.5: CR 4-1 header with Phase 9 muffler 40 Dellorto DRLA: 200 Air, 145 main, 70 idle Welcome to 10% ethanol oxygenated fuel... -Aaron Use Stabil or find gas without alcohol. You WILL get white deposits inside the carbs when the gas (alc) absorbs water from the atmosphere and then the gas & alc evaporates leaving the water to attack the carb bowls. If you drive the car frequently and dont let the bowls evaporate, it is not so bad. In a race car it will clog the jets. A filter doesnt help. |
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| yeahmag |
Oct 9 2017, 09:55 PM
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#3
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Advanced Member Group: Members Posts: 2,443 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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I use tons of Marine Stabil. Even considering Carb Defender from Driven.
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| sithot |
Oct 10 2017, 06:39 AM
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#4
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Member Group: Members Posts: 447 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None
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QUOTE(yeahmag @ Oct 9 2017, 11:30 PM) Well, another milestone has been passed. I started my journey with Dell's here in CA with the standard 60 idle jet (mind you I've been running Dells for over 20 years) Over the years (and different motors) I've slowly crept up. 62's in the early 2000's. 65's in 2010 or so... Today, tuning the 914 after my 3 year build, 70's! Yup... you heard right - 70!!! The same motor 3 years ago ran a 65. I couldn't believe it myself. My LM-1 is acting up, so I couldn't verify my AFR, but I even rebuilt the carbs first. It went for snapping and popping out the exhaust, a stumble in transition, and the mixture screws not responding "cleanly" to clean low end and a nice "report" from the mixture screws. I'll be picking up a new O2 sensor to see where it landed... 2056cc 2L heads cleaned up 86A cam 9.5: CR 4-1 header with Phase 9 muffler 40 Dellorto DRLA: 200 Air, 145 main, 70 idle Welcome to 10% ethanol oxygenated fuel... -Aaron Ever seen the jets in an "alcohol" race car? They're huge. We're fortunate enough here to have non-ethanol "laced" fuel in 93 Octane. I feel for guys who have to run this crap in old cars and bikes. |
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