MinnesotaFarmall Posted May 14 Share Posted May 14 Looking at upgrading my pulling engine some. I already have the "cold" 450 intake but found a Johnson lp intake. I read they are less desirable on the exhaust side but the intake is good. Thoughts on if the Johnson would make any difference over the style I already have? Quote Link to comment Share on other sites More sharing options...
560Dennis Posted May 15 Share Posted May 15 Only thing to do is measure it on the dyno . Might put mass air flow meter into the test . Measure stock ,the change to Johnson’s lp I f you don’t measure , it a guess. 3 Quote Link to comment Share on other sites More sharing options...
MinnesotaFarmall Posted May 16 Author Share Posted May 16 @randy hallhall thoughts? Quote Link to comment Share on other sites More sharing options...
560Dennis Posted May 16 Share Posted May 16 Post the results of your testing ,please , that way we can make decisions on the merits . Quote Link to comment Share on other sites More sharing options...
MinnesotaFarmall Posted May 16 Author Share Posted May 16 3 hours ago, 560Dennis said: Post the results of your testing ,please , that way we can make decisions on the merits . I'll have to if I ever get around to it. I don't have a dyno so finding one who isn't hundred an hour shop rate plus the other expenses of intake gaskets etc. Quote Link to comment Share on other sites More sharing options...
560Dennis Posted May 16 Share Posted May 16 46 minutes ago, MinnesotaFarmall said: I'll have to if I ever get around to it. I don't have a dyno so finding one who isn't hundred an hour shop rate plus the other expenses of intake gaskets etc. well I know cost is important , not everyone has these resources . Put on and try it at pull you , I d would try to keep everything the same carb , see if it makes a difference. You definitely hear the report from the exhaust will have a crack to it. I had this thought from mini engine days exhaustion only needs to be an 1/8 inch bigger than the exhaust valve. And smaller exhaust means the exhaust gas has to move faster to escape ,if the exhaust pipe is time correct to the pulse of each stroke you’ll get much higher scavenger vacuum , more suction on intake , with cam timings should be worth a try anyway. Take a look at torque tubes the put on the 1/8 mile dragsters just a suggestion 1 Quote Link to comment Share on other sites More sharing options...
superih Posted May 19 Share Posted May 19 How big an engine and are you running speed limit or open? The stock manifold manipulates the intake pulses better, I found better torque and throttle response with the stock manifold. Quote Link to comment Share on other sites More sharing options...
randy hall Posted May 19 Share Posted May 19 450 exhaust and an ellis lp intake would be the best. For a motor that isn't on the huge side I would use a 450 manifold and bore the throat out up to the runners 1/8" or so. Quote Link to comment Share on other sites More sharing options...
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