MGC Forum
Triple SU setup, which needles do you use?
 WA, USA
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Apr 22, 2024 10:49 PM
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 Joined 16 years ago
542 Posts
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Joern,
I'm probably not much help as I don't have my car running yet, but I'm starting out with TW needles.
Also, have you checked out Mintylamb's SU needle inter active comparison chart yet? It's pretty handy at http://www.mintylamb.co.uk/suneedle/
Bill
Edit, in the screen shot BAD needles are Red, TW is Orange and the standard ST needles is the yellow graph.
Edited 1 time(s). Last edit at 2024-04-22 10:53 PM by MG four six eight.
I'm probably not much help as I don't have my car running yet, but I'm starting out with TW needles.
Also, have you checked out Mintylamb's SU needle inter active comparison chart yet? It's pretty handy at http://www.mintylamb.co.uk/suneedle/
Bill
Edit, in the screen shot BAD needles are Red, TW is Orange and the standard ST needles is the yellow graph.
Edited 1 time(s). Last edit at 2024-04-22 10:53 PM by MG four six eight.
Attachments:
Screenshot 2024-04-22 at 20-51-07 Mintylamb SU Needle Compare-o-rama.jpg 33.5 KB
 W. Vancouver, , BC, Canada
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Apr 24, 2024 10:49 AM
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 Joined 19 years ago
17,991 Posts
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Have to look through my paperwork, but I think it was SM.
Bill Spohn www.rhodo.citymax.com/carstuff.html
Current: 1958 MGA Twincam (race car (170 bhp)),1962 MGA Deluxe Coupe (98 bhp)
1957 Jamaican MGA (200 bhp)1965 1971 Jensen Interceptor (350 bhp)
2009 Pontiac Solstice GXP Coupe (375 bhp)
2007 BMW Z4M coupe (340 bhp)
Recent: 1969 MGC roadster (175 bhp),Jensen CV8 (375 bhp),
1969 Lamborghini Islero S (350 bhp), 1988 Fiero GT turbo (300 bhp)
North Vancouver BC
Bill Spohn www.rhodo.citymax.com/carstuff.html
Current: 1958 MGA Twincam (race car (170 bhp)),1962 MGA Deluxe Coupe (98 bhp)
1957 Jamaican MGA (200 bhp)1965 1971 Jensen Interceptor (350 bhp)
2009 Pontiac Solstice GXP Coupe (375 bhp)
2007 BMW Z4M coupe (340 bhp)
Recent: 1969 MGC roadster (175 bhp),Jensen CV8 (375 bhp),
1969 Lamborghini Islero S (350 bhp), 1988 Fiero GT turbo (300 bhp)
North Vancouver BC
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Topic Creator (OP)
Apr 28, 2024 04:49 AM
Top Contributor
Joined 15 years ago
498 Posts
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Thanks for your input, I just ordered a set of C1-needles for my carbs. For the time being I managed to tune the carbs with the BAD-needles and get the car running quite satisfactory. I only could drive a short round in workshop area because I need to get some fuel first :-)
Car idles Ok, takeoff is easy, even in 2nd gear from standstill with minimal revs and no juddering or choking at all.
On the 123-app you can also see the ingition advance while revving the engine
Edited 2 time(s). Last edit at 2024-04-28 04:56 AM by mgdriver.
Car idles Ok, takeoff is easy, even in 2nd gear from standstill with minimal revs and no juddering or choking at all.
On the 123-app you can also see the ingition advance while revving the engine
Edited 2 time(s). Last edit at 2024-04-28 04:56 AM by mgdriver.
Attachments:
IMG_0057.JPG 56.1 KB
 Portland, OR, USA
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Apr 28, 2024 11:47 PM
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Joined 12 years ago
300 Posts
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Sorry, not a big help as I don't need much idle on my big Healey racer. I have a huge library of SU needles that I'm able fine tune with as I make improvements and upgrades on my 3 liter power plant with.
Attachments:
Healey Racer Motor 5:17 3 Overhead.jpg 64.3 KB
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W. Vancouver, , BC, Canada
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Apr 29, 2024 09:04 AM
Top Contributor
Joined 19 years ago
17,991 Posts
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When I was choosing needles for the triple carbs, I did it by comparing similar engines in this case the Triumph 2 litre - it has a similar bore and stroke ratio to the MGC (83mm x 92 mm. vs. 83.4 x 89 mm and neither uses siamesed ports. The stock needle for the Triumph was SM and when I used those in the triple carb MGC they fell within easy tuning range based on doing a few clean cuts at speed (on deserted highways early in the morning).
Bill Spohn www.rhodo.citymax.com/carstuff.html
Current: 1958 MGA Twincam (race car (170 bhp)),1962 MGA Deluxe Coupe (98 bhp)
1957 Jamaican MGA (200 bhp)1965 1971 Jensen Interceptor (350 bhp)
2009 Pontiac Solstice GXP Coupe (375 bhp)
2007 BMW Z4M coupe (340 bhp)
Recent: 1969 MGC roadster (175 bhp),Jensen CV8 (375 bhp),
1969 Lamborghini Islero S (350 bhp), 1988 Fiero GT turbo (300 bhp)
North Vancouver BC
Bill Spohn www.rhodo.citymax.com/carstuff.html
Current: 1958 MGA Twincam (race car (170 bhp)),1962 MGA Deluxe Coupe (98 bhp)
1957 Jamaican MGA (200 bhp)1965 1971 Jensen Interceptor (350 bhp)
2009 Pontiac Solstice GXP Coupe (375 bhp)
2007 BMW Z4M coupe (340 bhp)
Recent: 1969 MGC roadster (175 bhp),Jensen CV8 (375 bhp),
1969 Lamborghini Islero S (350 bhp), 1988 Fiero GT turbo (300 bhp)
North Vancouver BC
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