I Don't know of anyone.
But I am looking for a specific type of 1 1/2's and have a spare set 1 1/4's
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| twin 1.5" su's https://www.ausmini.com/forums/viewtopic.php?f=2&t=89982 |
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| Author: | AWOODY [ Fri Jul 17, 2015 3:43 pm ] |
| Post subject: | twin 1.5" su's |
Is anyone out there using twin 1.5" su's on an 1100 engine ? |
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| Author: | Bubbacluby [ Fri Jul 17, 2015 4:29 pm ] |
| Post subject: | Re: twin 1.5" su's |
I Don't know of anyone. But I am looking for a specific type of 1 1/2's and have a spare set 1 1/4's
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| Author: | 9YaTaH [ Fri Jul 17, 2015 5:22 pm ] |
| Post subject: | Re: twin 1.5" su's |
I'm thinking you should maybe do some work on your engine to match the carbies   
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| Author: | TheMiniMan [ Fri Jul 17, 2015 5:47 pm ] |
| Post subject: | Re: twin 1.5" su's |
If a std 998 can run an 1&1/2 quite well, then an 1100 can run twins with no problems at all... true each piston inside the 998 sees a single 1&1/2 (one at a time) so a set of twins is simply better because of less restriction in the manifold & far better (more even) distribution across all 4 cyls they work extreamly well if set-up well for the intended purpose so even with twin 1&1/2 carbs,,, each piston is still only seeing a single, just a far straighter , more direct, less restrictive path same-same , just less restriction & more even distribution no more inner 2 running slightly rich & outer 2 running slightly lean simples |
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| Author: | simon k [ Fri Jul 17, 2015 6:13 pm ] |
| Post subject: | Re: twin 1.5" su's |
TheMiniMan wrote: If a std 998 can run an 1&1/2 quite well, then an 1100 can run twins with no problems at all... true each piston inside the 998 sees a single 1&1/2 (one at a time) so a set of twins is simply better because of less restriction in the manifold & far better (more even) distribution across all 4 cyls they work extreamly well if set-up well for the intended purpose so even with twin 1&1/2 carbs,,, each piston is still only seeing a single, just a far straighter , more direct, less restrictive path same-same , just less restriction & more even distribution no more inner 2 running slightly rich & outer 2 running slightly lean simples except for the stop-start of the air flow down each throat because of the 2-1--3-4 firing pattern |
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| Author: | drmini in aust [ Fri Jul 17, 2015 9:09 pm ] |
| Post subject: | Re: twin 1.5" su's |
simon k wrote: TheMiniMan wrote: If a std 998 can run an 1&1/2 quite well, then an 1100 can run twins with no problems at all... true each piston inside the 998 sees a single 1&1/2 (one at a time) so a set of twins is simply better because of less restriction in the manifold & far better (more even) distribution across all 4 cyls they work extreamly well if set-up well for the intended purpose so even with twin 1&1/2 carbs,,, each piston is still only seeing a single, just a far straighter , more direct, less restrictive path same-same , just less restriction & more even distribution no more inner 2 running slightly rich & outer 2 running slightly lean simples except for the stop-start of the air flow down each throat because of the 2-1--3-4 firing pattern That effect is minimised by the balance tube, usually pretty big on twin SU setups. |
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| Author: | rathgar [ Fri Jul 17, 2015 10:36 pm ] |
| Post subject: | Re: twin 1.5" su's |
AWOODY wrote: Is anyone out there using twin 1.5" su's on an 1100 engine ? Yes I am. |
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| Author: | AWOODY [ Sun Jul 19, 2015 5:20 pm ] |
| Post subject: | Re: twin 1.5" su's |
What is your engine spec , needles and springs. |
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| Author: | drmini in aust [ Sun Jul 19, 2015 8:42 pm ] |
| Post subject: | Re: twin 1.5" su's |
I ran twin HS4s on a 1098 back in 1967. It was bored to 1218cc (68mm Imp pistons), ran a ported 1100S head with stock valves, a C-AEA544 cam and stock 1275 rockers. Exhaust was a Sonic LCB. It ran mid 16s at Castlerealgh drags, blew my mate's 1275S away.
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| Author: | rathgar [ Sun Jul 19, 2015 9:57 pm ] |
| Post subject: | Re: twin 1.5" su's |
AWOODY wrote: What is your engine spec , needles and springs. Motor was build in the mid 1990's so memory of exact details is vague. It's an 1100 plus 60 thou Modded 202 head with a lot (I now think to much) decked of it as I struggle to get head gaskets to seal. Russell engineering cam (I can't remember what he was doing back then, 1993 or 4 or what it was called) LCB exhaust with single RC40 Twin H4 SU's (I will check the needles and springs and let you know) and it pulls really well and was a great replacement for my tired 1360. |
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| Author: | AWOODY [ Mon Jul 20, 2015 4:23 pm ] |
| Post subject: | Re: twin 1.5" su's |
Thanks for that , yes my engine was built a long time ago (2 owners) and the guy who built it could not remember the exact details ! |
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| Author: | rathgar [ Mon Jul 20, 2015 6:36 pm ] |
| Post subject: | Re: twin 1.5" su's |
I think the springs are blue and the needles are E3. I will pull one out and have a look when I get a chance (may not be till the weekend). |
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| Author: | AWOODY [ Tue Jul 21, 2015 3:06 pm ] |
| Post subject: | Re: twin 1.5" su's |
that will be interesting, thanks |
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