What size jets do most box stock come with? I was thinking I heard around a .030. So for a box stock on the track could use a .042 to help out?
I may do that. I don't know anyone around here that has a dyno. I did get the trade school here to dyno a flathead years ago. I may call and see if they could still do it. I think I will check the jet in it to see what it is. Thanksthey come with a .28 most people agree a .32 is the ticket but depends on your altitude. get it dyno pull. any body with a small engine dyno will know what these motors like.
I may try the trail breaking. I guess with that you should have very little rpm drop. I have just started back racing. I used the brake but let off on the throttle. Will give it a try.To the original poster- You will find 95% of the time that the guys blistering you are doing it in a number of ways that do not have anything to do with the motor unless theyre cheating. Their karts roll very freely and their chassis setups are on point, not to mention their tires. Theyve learned that you never take your foot off the gas, they trail brake if they need to slow a bit. Foot still to the floor. Deceleration on these things is fatal. Yeah I am sure you can tweak it a bit to make it better. The governor arm has a lot of holes in it where the long spring attaches. When assembled the worker that checks rpms attaches the spring in the hole that gives it 3650 rpms. Move the spring to a further hole to get more rpms with governor. And dont get confused about the rpm rules, the 5500 or whatever rpm limit number is checked on the kart stand not on the track. 4900 is all you care about, and thats while racing. As far as the story about a completely box stock motor that ran 5000 rpm right out of the box goes, somebody in China was drunk when they checked that motor. Imagine the poor soul who could have bought that motor to put on his poor little rototiller. Ive been doing this a little while, running stock appearing stuff and small block opens. There was a big box stock race one day and I bought one just to try it. Its kind of maddening trying to get every one my my ducks in a row to run up front. The big race I went to? It was won by a guy who pitted next to me and yanked his open motor off the kart and borrowed a motor from the race track owners water pump. Had to remove it from the pump himself. I loaned him linkage parts to hook it up. And he kicked our butts. Motor was still muddy from its water pump life.
I read that one of the tracks let's you tie wrap a few of the coils of the spring to raise rpm also. Seems like all the holes in the arm are about the same but it makes a difference which hole the spring is in. My new Hemi is at 4900 out if the box with throttle screw backed all the way off. Want to get it to 5300 on the stand at least.To the original poster- You will find 95% of the time that the guys blistering you are doing it in a number of ways that do not have anything to do with the motor unless theyre cheating. Their karts roll very freely and their chassis setups are on point, not to mention their tires. Theyve learned that you never take your foot off the gas, they trail brake if they need to slow a bit. Foot still to the floor. Deceleration on these things is fatal. Yeah I am sure you can tweak it a bit to make it better. The governor arm has a lot of holes in it where the long spring attaches. When assembled the worker that checks rpms attaches the spring in the hole that gives it 3650 rpms. Move the spring to a further hole to get more rpms with governor. And dont get confused about the rpm rules, the 5500 or whatever rpm limit number is checked on the kart stand not on the track. 4900 is all you care about, and thats while racing. As far as the story about a completely box stock motor that ran 5000 rpm right out of the box goes, somebody in China was drunk when they checked that motor. Imagine the poor soul who could have bought that motor to put on his poor little rototiller. Ive been doing this a little while, running stock appearing stuff and small block opens. There was a big box stock race one day and I bought one just to try it. Its kind of maddening trying to get every one my my ducks in a row to run up front. The big race I went to? It was won by a guy who pitted next to me and yanked his open motor off the kart and borrowed a motor from the race track owners water pump. Had to remove it from the pump himself. I loaned him linkage parts to hook it up. And he kicked our butts. Motor was still muddy from its water pump life.
I tie wrapped the governor spring with it in the closest hole to the inside of the motor. 5450 in the stand with some surge. I think as long as we aren't over the 5500 on the stand we are fine.Our rules allow zip tying the spring, its basically the same as pulling the gov without pulling the gov lol.