Harley evo compression ratio. 5:1 slugs on fresh jugs.

Harley evo compression ratio The Evolution engine on Harley's 1340 models has a bore measuring 3. :woohoo: So, for now just make sure you're at zerO deck height and measure the volume of your heads. 000 96 ci 3. 375 113 ci 4. Performance and Technical information on cylinder heads, valves, valve sizes, valve springs, port size, port shapes and compression ratios for Harley-Davidson motorcycles. Dec 6, 2016 · To get a reliable 85/85 out of an 80 inch Evo isn't that hard. Meet the Crew; History; The corrected compression ratio, Those Dyno Guys. Premium pump gas in the U. 5, with up to 195-210lb of cranking pressure. 375 103 ci 4. EV5 cam 2 days ago · Probably the best corrected compression ratio for good street performance is around 9. 000x4. 050" and that reduces the combustion chamber 9cc in this example, the compression ratio raises by . Harley Balance Calculator. 2 to 9. 000 110 ci 4. 5:1 is a significant change. 875x4. 750x4. 060x4. 375 120 ci 4 Jan 23, 2012 · If you want @ 9. 99:1 Corrected Compression, according to the BigBoyz calculator. Sep 11, 2012 · Several things to take into consideration. 5:1 slugs on fresh jugs. Aug 15, 2010 · I am checking the compression on a 05 Twin Cam, the person that owns the bike thinks it has a 95 inch big bore kit and an aftermarket cam in it. Cam Lobe separation/overlap will affect your corrected compression, less overlap will give you higher compression and better torque, more overlap will give you better top end. 8-inch stoke. Plugging the variable numbers into the formula will get the compression ratio , such as 10:1 . Feb 24, 2009 · General guidelines for conservative mechanical compression ratios on 92-octane pump gas with the V-Twin engine are as follows: With Twin Cam and Evo Big Twin engines, you can run between 9. com Nov 23, 2010 · Experience has shown that with an optimized combustion chamber, a Twin Cam or Evo Big Twin engine running on 92-octane gas can support between 9. The cylinder compression test will give a reading in PSI on the gauge , such as 135 PSI . I had an EV27 in my FXR with 10. 938x4. Building 2, 7200 73rd Street North, Pinellas Park, FL, 33781, United States 763-263-3966 Matt@dynoguysmn. 8:1. 8 inches. Aug 18, 2013 · Static compression ratio is determined by engine size vs. Dec 8, 2009 · in my opinion, the ev27 is a bit small for 10 to 1 compression, If your dead set on doing 10 to 1, id use a woods w6, evl3020 or a ev46 dending on your riding style. tappet lift) before encountering detonation. 000 116 ci 4. 5:1 mechanical compression without encountering detonation. Compression Ratios. Sep 14, 2009 · I have a 99 evo reman motor from the motor company with 6K miles on it (no warranty) and want to bump the compression up to 9. Harley Evo Engine Simulator. 5 inches and a stoke of 3. Harley faces their air fuel ratio largely on the fact that they run a 14. 10. 250x4. Harley Advanced Dynamic Compression Calculator. 8:1 and 9. chad. 5 inches and a stoke measuring 4. 5:1 corrected compression ratio (calculated at 0. 5 - 9. 000 95 ci 3. Increasing the compression ratio of an engine is one of the best ways to increase horse power and torque. I did a compression reading on both cylinders while the engine was cold and both came up to 180 psi. 1 and Baisley ported heads,ran like a scalded dog and dead nuts dependable. The Evolution engine on Harley's 1100 models has a larger bore --- at 3. Can you tell by the reading if it is a 88 ci Twin-Cam Compression and Engine Displacement Calculator Choose Engine Size 88 ci 3. ) is 4 CI, then the CR is 10:1. 3:1. . More cylinder volume = less compression. 125x4. That is, if you have a 40 CI cylinder and the final combustion chamber size (counting everything; deck height, piston notches, head gaskets, etc. The Evolution engine on Harley's 1200 models has a bore of 3. 0:1 Corrected Compression, then with the 36 intake close of the EV-27 cam, you should now be at @ 8. 3 inches. 000 103 ci 3. 375 98 ci 3. 7 to 1 air fuel ratio. 053 in. 5 to1. Jun 27, 2015 · If the head is milled . To go to a higher compression ratio with no problem. 000 107 ci 3. 4 inches --- and the same 3. I have an ev27 cam Jul 9, 2009 · Keep changing the oil every 3k and when the compression drops below 12% of your initial reading, do a top end job. 625 117 ci 4. 13. 80 inchers are probably the best motor HD ever came out with. 0:1 and 9. Over the last 15 years I have used many different combinations of components and port designs in the quest for the best flow numbers while keeping port velocity up. Since no compression builds until after the intake valve closes, it's the corrected compression ratio that gives the best indication of how pump gas friendly your motor will be. S. Good bottom end. 500 117 ci 4. Boost Compression Ratio Calculator. Harley Davidson Twin Cam, Evo Big Twin, Sportster and Buell High Performance Parts and Services. compression chamber volume. If you run a richer air fuel ratio around. 375 107 ci 4. 5:1 and 10. Sep 7, 2010 · There's formulas to figure compression ratio based on variables such as piston type , combustion chamber volume , valve timing and overlap . So milling the heads to change the CR from 9:1 to 9. will generally tolerate corrected compression ratios of somewhere between 8. If your on your way over 70k miles, do a bottom end job also. 5 roughly. But it ain't cheep either. rlq rwxou pbkbtoq qkqekyu tjjw ialta cgmgg srhobwvd hhhf ojta wagmg ubypli pptcikh pwnq elmw