Berta720 Posted October 30, 2019 Report Share Posted October 30, 2019 was looking around and wondering if you guys put different carbs on z engines much or if you just run stock carbs, Im not looking for crazy power gains just get rid of the dumb emissions that are actually causing me troubles and allow me to change jetting and stuff but still have a good functioning choke so I can daily the thing easily. Quote Link to comment
datzenmike Posted October 30, 2019 Report Share Posted October 30, 2019 The emissions devices can cause problems if they are not maintained or if you remove then improperly. You can remove or deactivate the emissions devices but they really don't have any effect on full throttle performance. '80s carbed engines' emissions devices tended towards small adjustments after warm up and at moderate speeds. It's probably easier to check that the hoses are connected properly and are not split or loose. The stock carb is best over all but very complex. Most swap a 2/36 Weber on but you're looking at $300 to do this right and there are a lot of POS Chinese knock offs. Quote Link to comment
Berta720 Posted October 31, 2019 Author Report Share Posted October 31, 2019 Well I only need to richen the engine up a bit so I can install a small nitrous dry shot because I really want to put NOS on something. Quote Link to comment
datzenmike Posted November 1, 2019 Report Share Posted November 1, 2019 How about just running a larger secondary jet? It's vacuum operated so only gets used WOT at 2,500-3,000 and up when floored. Again you could stiffen the spring to delay the opening. I think nitrous needs the engine revved up a bit before you 'hit it' anyway. Maybe a switch on the carb so nitrous only when the secondary opens. Most driving is on the primary barrel anyway. Most secondaries are about 160 or 170 or I think 1.6mm or 1.7mm jet. A 190 would be a 25% increase in cross section so I guess 25% more fuel? Quote Link to comment
Berta720 Posted November 1, 2019 Author Report Share Posted November 1, 2019 ok i was going to put the switch on the secondary linkage or something anyhow, will def need a wide band so I know what is going on and if I can just drill the secondary jet that would be minty Quote Link to comment
datzenmike Posted November 1, 2019 Report Share Posted November 1, 2019 Properly burned 25% more fuel is 25% more power. Unfortunately the Z series heads may not support 25% more exhaust flow? Quote Link to comment
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