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| WHICH SU FIXED NEEDLES & SPRINGS https://ausmini.com/forums/viewtopic.php?f=2&t=102019 |
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| Author: | cooperess [ Fri Sep 29, 2023 6:00 pm ] |
| Post subject: | WHICH SU FIXED NEEDLES & SPRINGS |
Which fixed needles and springs should I use in my twin 1.5" SU's. Engine has 60 thou oversized flat top pistons. |
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| Author: | gtogreen1969 [ Fri Sep 29, 2023 6:07 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
cooperess wrote: Which fixed needles and springs should I use in my twin 1.5" SU's. Engine has 60 thou oversized flat top pistons. 7 is a good start, CP4 if you need a bit more fuel at the top , 6 if you need less. Twin HS4 Police SPO41 spec was Blue springs and CP4 needles Attachment: Twin HS4 needles 6,7,CP4.jpg
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| Author: | cooperess [ Fri Sep 29, 2023 6:28 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
The SU numbering system is doing my head in. Is the CP4 equal to AUD1118 |
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| Author: | gtogreen1969 [ Fri Sep 29, 2023 6:49 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
cooperess wrote: The SU numbering system is doing my head in. Is the CP4 equal to AUD1118 Yes. CP4 is the needle number but the part number to order is AUD1118 |
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| Author: | winabbey [ Fri Sep 29, 2023 7:02 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
By the time the Clubman GT SPO28 police spec came about the needle had changed to BG instead of CP4 as originally specified in SPO41, the blue springs being retained. I was chatting recently to a BMC field service guy who drove around supporting country dealers and he always took with him a bag of BG needles. The typical feedback from the police drivers who had their Cooper S needles changed by him was that it noticeably transformed the car. Attachment: NSW Service Letter 4_71 p1.jpg Attachment: NSW Service Letter 4_71 p2.jpg
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| Author: | gtogreen1969 [ Fri Sep 29, 2023 7:17 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
Here is a graph showing the BG compared to the others. Lots more fuel at the top end. Attachment: Twin 1.5 inch SU needle selection 6, 7, CP4, BG.jpg Here is a few examples that ST used on their Cooper Ss The AEA648 cam had the BG and the AEG510 had the No7. Attachment: Special Tuning Carby Needles CP4 , BG AEA648, 7 AEG510.jpg
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| Author: | cooperess [ Fri Sep 29, 2023 7:27 pm ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
Amazing guys, thank you. |
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| Author: | jaybee [ Sun Oct 01, 2023 8:09 am ] |
| Post subject: | Re: WHICH SU FIXED NEEDLES & SPRINGS |
cooperess wrote: Which fixed needles and springs should I use in my twin 1.5" SU's. Engine has 60 thou oversized flat top pistons. Excellent question and an identical one i was wondering about too. Thanks from me for all the answers too. |
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