Dynamic compression ratio vs octane

WebStatic Vs. Dynamic Compression Ratio. ... Race engines, using high octane race gas, can tolerate higher DCR's with 8.8:1 to 9:1 a good DCR to shoot for. The static CR needed to … WebJan 12, 2016 · Combine that with the .039 gasket & you have a quench of .084".You will have n detonation resistance at all & power be down considerably.Your static compression will be approx 8.5:1, but, more importantly, your dynamic compression (what the chambers actually see after cam timing is considered), will be approx 7:1.

Calculate Required Octane For Compression Ratio

WebMar 9, 2024 · First question -> How much dynamic compression can these /6s run on 87 octane gas? I'm reading anything from 8.3-1, to 9.5-1. Any real-world experience out there on compression VS. octane and avoiding the dreaded ping? Computing dynamic compression -> I have an old dial caliper and ordered a 100cc syringe to cc the … WebDetermining what the compression ratio is after the intake valve closes provides valuable information about how the engine will perform with a particular cam and octane. … shuffling classes https://phoenix820.com

Discussing Compression Ratio And Pump Gas …

http://www.maniacmechanic.com/calculate-required-octane-for-compression-ratio/ WebJun 12, 2009 · Most people know that an increase in Compression Ratio will require an increase in fuel octane for the same engine design. Increasing the compression ratio increases the theoretical thermodynamic efficiency of an engine according to the standard equation Efficiency = 1 - (1/compression ratio)^gamma-1. where gamma = ratio of … WebTherefore with the mild cam it will have a high dynamic compression ratio, probably 9.5:1+ which would be way too high to run safely on 91 octane gas. However, that same 11:1 … the other youtube for kids

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Dynamic compression ratio vs octane

What is the highest compression ratio for 91 octane? - R4 DN

WebThe ratio of the cylinder volume at IVC over the volume above the piston at TDC represents the dynamic compression ratio. The DCR is what the air fuel mixture actually “sees” … WebJan 3, 2010 · A 72° ABDC closing would put the DCR at 8.16 which isn't much less than the 8.45 he calculated. The difference is most likely he used the .006" duration numbers …

Dynamic compression ratio vs octane

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WebDec 22, 2003 · Using dynamic compression ratios is the best way to "guess" at octane needed. Gasoline will only compress so much before it blows up like desiel fuel, octane is this resistance to doing so. Dynamic compression is how much the actual air fuel mixture is getting compressed. '74 Gran Torino Project. 351W, c6 trans, 9". WebDec 1, 2012 · That is how so many newer engines can employ a 12:1 CR on 87-octane gasoline without experiencing abnormal combustion. ... While the compression test is dynamic (the piston is moving), the ...

WebMay 16, 2006 · The optimum intake-to-exhaust ratio could range from as little as 0.75:1 (for a low CR supercharged engine) to as much as 1:0.6 (for a very high-compression naturally-aspirated engine). WebJun 12, 2009 · AC) Most people know that an increase in Compression Ratio will require an increase in fuel octane for the same engine design. Increasing the compression …

WebApr 7, 2010 · 338 Posts. Discussion Starter · #1 · Apr 3, 2010. alright so I'm trying to nail down my quench/compression ratio. Looks like a lot of folks are running 11.4:1 to 11.6:1 compression ratios on LS engines without issue from what I can tell. We travel in this car so I want to be able to safely drive this thing at sea level with 91 octane without ...

WebApr 10, 2010 · 9,699 Posts. #2 · Apr 9, 2010. Building a motor to a dynamic compression ratio number just means it will detonate at higher rpm where you won't hear it. 10:1 compression is too high for pump gas, I don't care where you live or how big a cam is in it. At some point in the rpm range that big cam that bleeds off your low rpm compression …

WebDec 15, 2011 · Use a good gasoline ( Shell or Chevron ) , keep the compression below 11.0 , and the engine temp as low as possible . I have 10.7 static 7.9 dynamic compression ratios, Cast iron heads 91 octane, motor likes 39 degrees total on 100 octane and can only handle 31 degrees on 91. Engine runs at 170 water temp. the other zeroWebAug 27, 2024 · Static compression ratio of 9.25:1. Effective stroke is 3.55 inches. Your dynamic compression ratio is 8.61:1 . Your dynamic cranking pressure is 174.81 PSI. … shuffling dancingWebMar 22, 2007 · Dynamic Compression using DCR Calculator: 7.97. This is one MEAN CAM. Excellent Torque and revs easily over 6000 rpm. Has an exhaust note to die for. … shuffling dance classesWebApr 13, 2024 · This is why some engines require 100+ octane with an 11:1 compression ratio while others are perfectly fine on 91 octane with a 13:1 compression ratio. E-85 has an equivalent octane rating of 105, and with an expected operating temperature of around 180°F, the maximum dynamic CR is slightly above 10.5 the other youtubeWebDec 29, 2011 · Most gas stations offer three grades of octane, with regular rated typically at 87, mid-grade at 89 and premium at 92 or 93 [source: … shuffling dance definitionWebMar 27, 2015 · 5,060 Posts. #5 · Mar 26, 2015. corwindotson said: Ok so I have been trying to do some research about compression ratio. So I found out that there are two types of compression ratios that should be considered when building an engine. One is static compression ratio (scr) and the second is dynamic compression ratio (dcr). shuffling clothesWebNov 20, 2024 · Step 7 – Determine the compression ratio: Use the formula below to compute the compression ratio. Compression ratio = { (swept volume + clearance volume) / clearance volume} Swept volume = (π) x … the other zapruder film