Waxstat to Conventional Conversion
Orig. Posting Date | User Name | Edit Date |
Sep 30, 2019 05:06PM | dklawson | Edited: Oct 1, 2019 05:34AM |
Sep 30, 2019 04:11PM | Summerspop | |
Sep 27, 2019 02:55PM | dklawson | |
Sep 27, 2019 08:58AM | malsal | |
Sep 27, 2019 05:19AM | Dan Moffet | |
Sep 26, 2019 04:26PM | Summerspop | |
Sep 24, 2019 07:53PM | malsal | |
Sep 24, 2019 03:55PM | Summerspop | |
Sep 24, 2019 03:30PM | malsal | |
Sep 24, 2019 01:57PM | Summerspop | |
Sep 24, 2019 01:40PM | Summerspop | Edited: Sep 24, 2019 02:44PM |
Sep 24, 2019 01:34PM | CooperTune | |
Sep 24, 2019 07:29AM | malsal | |
Sep 24, 2019 06:33AM | dklawson | |
Sep 24, 2019 05:35AM | CooperTune | |
Sep 23, 2019 11:32AM | Summerspop | |
Sep 23, 2019 11:02AM | malsal | |
Sep 23, 2019 07:42AM | jedduh01 | Edited: Sep 23, 2019 07:44AM |
Sep 23, 2019 05:07AM | CooperTune | |
Sep 22, 2019 06:40PM | dklawson |
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Someone has posted a PDF copy of the book "Tuning SU Carburetors". The link below is to a 49 page PDF copy of the book.
https://tecb.eu/onewebmedia/Tuning_SU_Carbs.pdf
You can never have too many reference documents.
Burlen is the current owner of SU. The links below are for several tech documents they post online.
HS Carb Operation: //sucarb.co.uk/technical-hs-type-carburetter-description-adjustments
HS Tuning general: //sucarb.co.uk/technical-hs-type-carburetter-tuning-general
HS Tuning single carbs: //sucarb.co.uk/technical-hs-type-carburetter-tuning-single
HS Tuning multiple carbs: //sucarb.co.uk/technical-hs-type-carburetter-tuning-multi
Some HS carbs have a lifting pin on the side which is used to lift the carb piston a bit during tuning to determine when the mix is "right". Use the pin or a thin screwdriver in the carb throat to lift the carb piston 1/32" to 1mm. Hold the piston in that position. While you do this, monitor the engine RPM and listen to how it sounds. When the mix is right the RPM will go up slightly, then drop back down a bit. If the mix is rich the engine RPM will go up and stay up. If the mix is lean the engine RPM will drop and the engine may even stall. (See page 27 and 29 of the PDF document linked above).
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I still have the issue with the loose wire cutting the engine off but as long as I leave it unattached, it runs great.
I don't remember the disconnected wire. Perhaps you can start a new thread about that problem.
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If in doubt, flat out. Colin Mc Rae MBE 1968-2007.
Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.
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"Hang on a minute lads....I've got a great idea."
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If you don't have a gauge you can rent one from any of the parts stores. Check all four of the compressions and post the numbers.
Remove the distributor cap and see if you have points or an electronic ignition.
Have you done anything else except change the jet and carb gaskets?
If in doubt, flat out. Colin Mc Rae MBE 1968-2007.
Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.
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Does it still have points and condenser or is it electronic ignition?
Trying to rev it up
That's why I replaced the plugs today because someone mentioned that the plugs may be too fould to fire correctly. When I can get it running like this, if I pull either of the right 2 plug wires off, it continues to run rough. I can here the wire arching to the plug so it is getting spark. If I pull either of the left 2 wires though, it dies. The wires run to the bottom front of the engine where it looks like the plug into a distributo .
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Does it still have points and condenser or is it electronic ignition?
If in doubt, flat out. Colin Mc Rae MBE 1968-2007.
Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.
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Last post: Apr 6, 2020 Member since:Mar 9, 2019
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Cars in Garage: 0
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Total posts: 26
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https://youtu.be/704YGhOGZE8
Replaced the fuel filter and spark plugs, couldn't keep it running. Put the old waxstat jet back in and it starts but idles rough and still a sluggish response. Probably need to work on the fuel mixture?
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Total posts: 8382
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If in doubt, flat out. Colin Mc Rae MBE 1968-2007.
Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.
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If you buy the kit to make the conversion from Waxstat to standard jet a new linkage part should have been provided. It is highly unlikely that the new linkage part will put the new jet at exactly the same height as the old Waxstat. Tweaking the mixture setting will be required.
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To CooperTune, if I'm having this much trouble just replacing the jet, I am sure to pull the last of my hair out trying to install a a whole new carb.
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Do you have a fuel filter? If so remove it and blow through it to check for flow.
Jedduh01. As for over tightening the fuel line and collapsing the fuel hose. The fuel hose has a brass ferrule inside it so i don't think it is possible.
If in doubt, flat out. Colin Mc Rae MBE 1968-2007.
Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.
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You should remove the fuel from the fuel bowl.
I would use brake cleaner or Carb cleaner = and you can spray into the Jet = you should quickly and easily see that fuel come back into the bottom of the fuel bowl.
OR vice versa. Spray into the bottom of the fuel bowl where the jet hose connects.. and you should have the fuel bubble back out of the jet ( this direction is harder to get good spraying application of sprays.
You're checking for an unobstructed fuel supply.
As with this =if you jsut replaced the jet by pulling out the old one = and sliding in the new one. the car should resume 'same' running characteristics. (jet height should be the same old to new)
I am not for certain on this = could you over tighten the jet tube nut on the bottom of the fuel bowl and Choke off the fuel hose?
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My current project is a 1400 with twin HIF 38s. If you want to go to the more modern HIF 38 I should have rebuilt as well as ready to rebuild ones. Steve (CTR)
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Found 39 Messages