Created by: | Orig. Posting Date | User Name | Edit Date |
| Oct 19, 2023 07:38AM | 1963SV3 | |
| Oct 15, 2023 03:52AM | TK | |
| Oct 13, 2023 09:36AM | Alex | |
| Oct 13, 2023 05:40AM | VG30JT1N |
Posted:
Oct 19, 2023
07:38AM
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Total posts: 154
Last post: Feb 12, 2024 Member since:Oct 23, 2020
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All SU needles of a particular class (90 thou for HS2s) are almost identical at idle.
I would be looking at the float bowl jet that could be causing flooding at very low revs…
Cheers, Ian
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Get it tuned on a dyno (rolling road)
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Total posts: 10238
Last post: Apr 26, 2024 Member since:Mar 24, 1999
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What pulgs and what gap ?
GY needles with the jets two turns down should be about right.
GY needles with the jets two turns down should be about right.
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Total posts: 2
Last post: Oct 13, 2023 Member since:Oct 13, 2023
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1968 Mk2 998 with dual 1 1/4" SU's. Plugs are fouling at idle, black sooty exhaust. If the vehicle is driven right after start the plugs clear and driveability is excellent. Plug check if shut off at speed indicates a light tan color and good plug temperature. The needles were originally AN which would indicate that this setup probably came from a 1275. I have changed the needles to GY with little effect. My assumption is that at idle the air drawn into the engine isn't sufficient to atomise the fuel mixture correctly and keep the plugs hot enough to keep them clean.
What does the forum say? Thanks
What does the forum say? Thanks
