Valin Posted September 26, 2009 Report Share Posted September 26, 2009 I am about to throw my longrod 4mm motor together in the near future, and am wondering about what squish height should be run for a pump fuel setup. I'll be running a ProDesign coolhead with 21cc domes. I've looked a bit on this site, and it looks like alot of people are in the 35 thou range, which seems excessively tight for a pump fuel application. This is my first Banshee build. I have never built a motor this tiny, and on my other motors i'm in the 60 thou range....... Quote Link to comment Share on other sites More sharing options...
spurdy Posted September 26, 2009 Report Share Posted September 26, 2009 I am about to throw my longrod 4mm motor together in the near future, and am wondering about what squish height should be run for a pump fuel setup. I'll be running a ProDesign coolhead with 21cc domes. I've looked a bit on this site, and it looks like alot of people are in the 35 thou range, which seems excessively tight for a pump fuel application. This is my first Banshee build. I have never built a motor this tiny, and on my other motors i'm in the 60 thou range....... I am running 105 octane fuel and have mine set at 0.042". I know some guys run them pretty tight but I think most everyone is between 0.040" and 0.050". SP Quote Link to comment Share on other sites More sharing options...
rubberneck Posted September 27, 2009 Report Share Posted September 27, 2009 I just put together a 350 and the squish came out at .053. Jeff told me to run it as is and add a degree of timing. Runs good. Also, you didn't state elevation, but with 21 cc domes, im not sure you will be able to run pump gas on a 4mil motor. Check it before you run it for sure to make sure. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted September 27, 2009 Report Share Posted September 27, 2009 My stock cyl 4mil is .050,421 cub is .048,both on race gas though.I just put a stock stroke ported motor together with 21cc domes,Pump gas motor 145psi static comp .052 squish.I woulnt build a motor around squish,thats a non issue easily cured Quote Link to comment Share on other sites More sharing options...
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