Fiji wrote:
Funny u mention that I have a 42mm delorto / manifold sitting on my bench.fuel economy springs to mind when I think of using it
and thats where we differ my friend... i think delorto, i think induction sound....mmmmmmm
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| exhaust & carby setup? https://www.ausmini.com/forums/viewtopic.php?f=2&t=63197 |
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| Author: | Fiji [ Fri May 21, 2010 12:19 pm ] |
| Post subject: | exhaust & carby setup? |
Interested in getting a little more out of my stock 1275 without really taking it apart just yet... Will going down this track help? Currently a 1 1/2" SU (stndrd inlet manifold) 2" exhaust lukey muffler (extractors ..not sure which kind) Was thinking a 1 3/4" SU & larger inlet mnifold. Also a better set of extrctors and 1 1/2" exhaust (hotdog running to muffler) Which extractors should i track down? any suggestions? |
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| Author: | simon k [ Fri May 21, 2010 12:46 pm ] |
| Post subject: | Re: exhaust & carby setup? |
Fiji wrote: Interested in getting a little more out of my stock 1275 without really taking it apart just yet...
Will going down this track help? Currently a 1 1/2" SU (stndrd inlet manifold) 2" exhaust lukey muffler (extractors ..not sure which kind) Was thinking a 1 3/4" SU & larger inlet mnifold. Also a better set of extrctors and 1 1/2" exhaust (hotdog running to muffler) Which extractors should i track down? any suggestions? The carb is the first thing to change. 1 3/4" is the way to go your current extractors are probably fine, the jury is out on whether 1275's like 2" or 1 3/4" better |
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| Author: | poeee [ Fri May 21, 2010 12:50 pm ] |
| Post subject: | |
1.75" SU on a good manifold with 1.75" exhaust. Will be great on a stock 1275 right through to the hottest road engine. |
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| Author: | Fiji [ Fri May 21, 2010 1:23 pm ] |
| Post subject: | |
Sounds good 1 3/4 su x 1 3/4 exhaust & better manifold. |
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| Author: | 1275LS [ Fri May 21, 2010 2:42 pm ] |
| Post subject: | |
Fiji you will need to decide if you want a HS6 with manual choke or a later HIF model with autochoke. |
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| Author: | gafmo [ Fri May 21, 2010 9:00 pm ] |
| Post subject: | |
with a 1275 I would have three choices. HS6 HIff44 (auto Choke not needed) or Dellorto 45. All need to be Tuned and adjusted. One thing I will ensure is to get the Carb to manifold to Head ports "Matched" Exhaust I would keep as a number of people on here have good HP with a 2" |
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| Author: | Fiji [ Fri May 21, 2010 10:45 pm ] |
| Post subject: | |
Funny u mention that I have a 42mm delorto / manifold sitting on my bench.fuel economy springs to mind when I think of using it |
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| Author: | mattsmadmini [ Sat May 22, 2010 2:29 am ] |
| Post subject: | |
Fiji wrote: Funny u mention that I have a 42mm delorto / manifold sitting on my bench.fuel economy springs to mind when I think of using it
and thats where we differ my friend... i think delorto, i think induction sound....mmmmmmm
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| Author: | drmini in aust [ Sat May 22, 2010 8:05 am ] |
| Post subject: | |
Fiji wrote: Funny u mention that I have a 42mm delorto / manifold sitting on my bench.fuel economy springs to mind when I think of using it
Properly jetted (a little leaner for road use), the economy isn't too bad. I run a 45 Dellorto with 38mm chokes in it (but I'm fitting 36s in for the 1412). |
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| Author: | Fiji [ Sat May 22, 2010 9:02 am ] |
| Post subject: | |
Looks likeI might have a sit down think about his a bit today and find out what chokes are in it at the moment. Anyone had any luck with delorto tuning with out loading the car on a dyno?i |
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| Author: | drmini in aust [ Sat May 22, 2010 9:54 am ] |
| Post subject: | |
Fiji wrote: Looks likeI might have a sit down think about his a bit today and find out what chokes are in it at the moment.
Anyone had any luck with delorto tuning with out loading the car on a dyno?i Yes. I went and borrowed GR's portable A/F ratio meter, then went for a drive. 
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