Coupelx Posted May 25, 2014 Report Share Posted May 25, 2014 but probably have a far better dome design than he has. Quote Link to comment Share on other sites More sharing options...
camatv Posted May 25, 2014 Report Share Posted May 25, 2014 my trail bike i ran a 65 tho squish clearance on pump gas. it ripped. ran for miles and never acted crazy. you have to rember "optimal tight squish" is good for short burst motors. drag motors etc, long drawn out trails. long heavy load like hill climbs and long low throttle lean condition rides like trails will like more clearance than the so called optimal. plus larger bores will want more clearance also. try running a 421 cub at 40 tho or a big single nope not going to live for long at all. i personally prefer larger than so called "optimal" squish for riders and drag bikes for many reasons. mostly for deto issues with running low octane pump gas. and reliability concerns the band width and dome profile seem to do a lot more than just sqush. if your domes have a really wide band in them and a tight squish your asking for trouble. its easy to see where a motor actually wants its band at with used domes. at least thats how i started looking at it. the cool thing now is your going to be able to try 2 sets of domes back to back and compare them. hopefully you spec'd a small width band less than 10mm wide.. Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 26, 2014 Author Report Share Posted May 26, 2014 What squish and band width should I go for? Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 26, 2014 Author Report Share Posted May 26, 2014 He's not cutting them till Tuesday morning. He wants me to do another squish test. It doesn't make sense how my squish went up by .010. I'm out of town till tonight. Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 26, 2014 Author Report Share Posted May 26, 2014 My cracking compression went from 160 to 145 with the change the base. Now the online uccr calculator puts me at 12.9:1 with 155cc's of fluid I the chamber Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 26, 2014 Author Report Share Posted May 26, 2014 I pulled the head off Saturday morning to measure the domes clearance and width for David. I got a .034 clearance and 22mm width. My deck height is .006 under. So not sure why I have a .055 squish. I'm mmeasuring above the wrist pin. There is no play in the rod bearings. Hmmmmm........ Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 26, 2014 Author Report Share Posted May 26, 2014 My cracking compression went from 160 to 145 with the change the base. Now the online uccr calculator puts me at 12.9:1 with 155cc's of fluid I the chamber Quote Link to comment Share on other sites More sharing options...
v2004banshee Posted May 26, 2014 Report Share Posted May 26, 2014 Have you tried measureing it with a piece of solder laying across the piston. Not just 1 side. I just built a new motorwith a new crank piston bearings ect and recieved a .005 difference from just sticking it threw the plug hole no matter how manytimes i did the test. I know cam has had the same experiance. Jmo so dont agree but its worth a shot. The solder threw the plug hole was giving the looser number. Quote Link to comment Share on other sites More sharing options...
possum Posted May 26, 2014 Report Share Posted May 26, 2014 orings give you .010 more also. when measuring step and deck add 10 thou for orings. Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 27, 2014 Author Report Share Posted May 27, 2014 I bolted the head back on and did another test. This time I used two pieces of solder through the spark plug hole and put them on opposite sides of the piston above the wrist pin. I though this was an easier way. I did several readings this way and I get .048-.050 depending on how much pressure I put on the caliper. Before I was measuring the solder perpendicular or across it with the caliper. This time I measured the middle of the solder parallel with it. I think that this would be more accurate then across it. I emailed David the info. I gave him tons of specs and info so the ball is now in his court. He has way more experience and I trust his judgment in cutting me a set of customs. I'm sure they will out perform off the shelf's. 1 Quote Link to comment Share on other sites More sharing options...
turbowrenchhead Posted May 27, 2014 Author Report Share Posted May 27, 2014 I got my rear shock back from house of horse power. Now it sits nice! I threw my tank on and took it for a short spin. It feels good pulls hard 1 Quote Link to comment Share on other sites More sharing options...
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