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Carburation


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Just switched out the stock air cleaner on my 1972 240Z with Motorsports polished aluminum air horns with out air cleaners. Because they flow so much more air I am now getting a stumble under full acceleration. Any ideas other than screwing the air mixture out and changing the viscosity (thicker) of the damper fluid? I like the looks of the air horns with out cleaners. The car is not a daily driver so I'm not too worried about dirt.

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Are you already runing SM needles? They provide a richer misture off-idle. As for no filter, it doesn't take a lot of ingested dust and grit to eat up the rings and cylinders. I'd seriously consider a filter of some sorts. Afterall, the hood is down most of the time. You can always pull the filters to show off the horns when showing the car.

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Guest Rolling Parts
...it doesn't take a lot of ingested dust and grit to eat up the rings and cylinders. I'd seriously consider a filter of some sorts.

 

I agree, the 240Z swirls an amazing amount of dust under the hood because it's so open under the engine. Even parked I notice dust/grit getting on the engine! I think MSA has the filter elements for their horns.

 

Here is a guide I use when deciding on springs, oil viscosity, and needle selection:

http://www.zparts.com/zptech/articles/mal_land/ml_sucarb2/SUcarb_111601b.htm

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Hi, you can get filter to put over your ram pipes. UZI or company name is something like that. I ran auto trans fluid dextron 3 in my carbs to let the pistons rise faster to get rid of the bog you describe. I didn't have much luck with the SM needles so I went back to stock metering needles.

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  • 8 years later...
On 10/29/2009 at 5:39 AM, Guest Rolling Parts said:

 

I agree, the 240Z swirls an amazing amount of dust under the hood because it's so open under the engine. Even parked I notice dust/grit getting on the engine! I think MSA has the filter elements for their horns.

 

Here is a guide I use when deciding on springs, oil viscosity, and needle selection:

http://www.zparts.com/zptech/articles/mal_land/ml_sucarb2/SUcarb_111601b.htm

 I went looking for this article today, and found it here:

http://www.zparts.com/zp_html/zptech/articles/mal_land/ml_sucarb2/images4/SUcarb_111601b.htm

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