holley jet sizing.... curious what others are running
08-10-2011, 09:00 AM
#11
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also.... my intake is neither of the ones you listed but it is an air gap style single plane with a tall neck.... it was actually for my efi set up that came with the replacement motor i bought... it has the holes for the injectors and everything that i momentarily plugged with steel freeze plugs until i get a chance to make the efi work this winter..... dont have any issues with it though
08-10-2011, 02:51 PM
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just in addition to information i have already posted... and questions i have asked.... someone said that the size differences were due to runner length and heat.... well as i was just looking at my intake manifold it seems that the port front is shorter than the port rear and the starboard rear is shorter than the front
wouldnt you want the larger jet on the longer runner or am i A$$ backwards because these numbers would put the shorter runners wit the bigger pills
wouldnt you want the larger jet on the longer runner or am i A$$ backwards because these numbers would put the shorter runners wit the bigger pills
08-10-2011, 03:06 PM
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after closer look at the dart intake mine looks almost the exact same except it basically from a holley avenger set up that marine power converted to mefi1.... but it is the same intake mani and is about the exact same size and dimensions
08-10-2011, 04:16 PM
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i really dont think it is running to its potential.... she is a pig out of the hole which is obvious and doesnt bother me as i have had boats in the past that had big pitch props but it falls on its face on the top end which i think could be dude to jetting....
why not try to make more power with a setup if you can....
why not try to make more power with a setup if you can....
08-10-2011, 05:14 PM
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Longer runners are sucking harder....smaller jets.
If you average the front and back jetting as Merc did it, you would end up with 78/91. I think you said you were at 72/87. Merc set these up for sea level and to be "safe", so depending on what elevation you are at, it would seem you might be a tad lean, especially in the rear.
If you average the front and back jetting as Merc did it, you would end up with 78/91. I think you said you were at 72/87. Merc set these up for sea level and to be "safe", so depending on what elevation you are at, it would seem you might be a tad lean, especially in the rear.
08-10-2011, 05:23 PM
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Longer runners are sucking harder....smaller jets.
If you average the front and back jetting as Merc did it, you would end up with 78/91. I think you said you were at 72/87. Merc set these up for sea level and to be "safe", so depending on what elevation you are at, it would seem you might be a tad lean, especially in the rear.
If you average the front and back jetting as Merc did it, you would end up with 78/91. I think you said you were at 72/87. Merc set these up for sea level and to be "safe", so depending on what elevation you are at, it would seem you might be a tad lean, especially in the rear.
08-11-2011, 05:36 PM
#19
i really dont think it is running to its potential.... she is a pig out of the hole which is obvious and doesnt bother me as i have had boats in the past that had big pitch props but it falls on its face on the top end which i think could be dude to jetting....
why not try to make more power with a setup if you can....
why not try to make more power with a setup if you can....
