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#1
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Tuning carbs....
Are a pain in the rear!
Never done one before, so I am stumbling though getting this Holley 650 tuned! I know it's not complicated, but I've never done one before, so it's a bit challenging! I got the floats/bowls dialed in, now onto making power. It has great off line power, but once you're off the line (like above 1300rpm), it feels like a 240D! SirNik gave me a crash course in tuning over the phone, so we will see how it goes tomorrow... Hopefully we can wake this bad boy up, and have some fun! Thoughts? suggestions?
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-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic. |
#2
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Carburetors are of Shaitan. EFI is your friend. What are you working on anyway?
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#3
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We are working on a Nissan S13, with an 85 roller/carb 5.0...
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-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic. |
#4
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What size engine is the carb being used on?
Are your secondary throats opening?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#5
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There's a couple types of 650, a 4150 and a 4160. Do you know which this is? At least one company makes replacement jet blocks that have externally removable jets so you don't have to take the whole carb apart to make a change.
This: http://www.summitracing.com/parts/php-15001
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 Last edited by KarTek; 09-02-2013 at 08:12 AM. |
#6
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Tuning carbs....
http://m.youtube.com/watch?v=6vKlAnKdcB4&desktop_uri=%2Fwatch%3Fv%3D6vKlAnKdcB4
Im thinking the power valve is way off or blown. |
#7
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The first thing in tuning a carb is to make sure everything else is good. If anything else is off, you are pissing upwind.
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#8
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yes, good point.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#9
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Quote:
When the carb has a problem, I call someone else to work on it.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow |
#10
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Carbs are not difficult; they just require a systematic approach--like almost anything else. Unless it is new out of the box, assume NOTHING is correct until you have verified it. Don't go changing parts willy-nilly. Proceed in any orderly fashion. Cars and other power equipment have used carbs for well over 110 years. At least with a carb, you can usually see the problem. Its very difficult to trace the electrons moving around inside the chips in the EFI computer.
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#11
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Quote:
The Holley carbs are very similar to Webers. High quality and very adjustable with jets that can be changed without tearing it all apart (though usually changing jets will not solve the problem).
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#12
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People have crapped in their pants when they were young too. Doesn't mean that they always should. IMO it is easier to see exactly what is going on when you have a screen shot of what the computer is doing. It is also a lot more precise than say reading plugs when you can see what the O2 sensor is saying. I believe the way to tell if your Jetski carb was "right" was to take it to the middle of the lake, replace the plugs with fresh, start it up, WOT it and read it. Does that tell you idle, mid range? Nope. Just that it was "right" at WOT and therefore MAYBE right at all others. Way too imprecise for me. In my car, I can datalog and see what it is doing. We can also make adjustments to the curve at the right points instead of a "one size fits all" solution. Also checking the carb is way too subjective for my comfort level. I'd much rather have a screen output that shows me as opposed to what looks, sounds or feels ok.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow |
#13
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Yeah you used to crap your pants too.....and some of us happen to have cars and other devices which have carbs on them so this thread is helpful to all who do.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#14
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Not sure if you still do but I don't anymore. When that day comes where I restart it, probably best to be scrapped then. At this point, you couldn't give me a car or a power toy with a carb unless I could sell it to some sucker who wants it. As I said, I only tolerate it in the lawn equipment because there isn't a finacially feasible choice or it too would be gone like a pair of underwear that someone sharted on.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow |
#15
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Tuning carbs is simple albeit time consuming once you understand the basic subsystems found in all carbs.
Assuming timing advance systems are working correctly, your problem can be a too lean main jet or more likely something to do with the power system. If the carb has a vacuum secondary, that could be your problem, but most 650 hollers have mechanical secondaries. There is a book, published by HP Books, that has been in print for over 40 years. I think it is called Holley Carburetors. It is an EXCELLENT book for learning the principles of carburetion, and the specifics of Holleys. Regardless of what carb you are messing with, this book will teach you the principles that you need to understand. The subsystems in a carb interact, so if you don't understand the principles, you will be chasing your tail. Hope this helps. |
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