Ls1 compression ratio12/24/2023 ![]() ![]() Not my own words just did a little research for you. This means less heat is generated in the combustion chamber where heat can cause detonation. The whole point of the operation is to get the highest final pressure possible before igniting the air:fuel mixture.Compressing air generates heat, which causes detonation.The turbo compressing the air generates heat, but that heat can be removed by an intercooler.Then the engine itself doesn't have to compress it as much to read the same final pressure. One this is certain, if you want to lower compression, you will have to open up the cc on your head and use a thicker head gasket so converting to E85 and all the work need to make it work sound like its getting expensive-danfiggĪ low compression high boost motor can run on "worse" gas then a high compression motor, but the turbo won't spool as quickly, and off boost power will suffer. With the same amount of final pressure in the cylinder (pressure after being compressed) you'll have the same torque and same hp numbers.Ī low compression high boost motor can run on "worse" gas then a high compression motor, but the turbo won't spool as quickly, and off boost power will suffer. The Effective Boosted Compression Ratio from your Boost of 15 psi is 13.41: 1 With 9.5 compression the Boosted Compression Ratio from your Boost of 15 psi is 19.10 : 1 ![]() 70% to 90% ethanol depending on where its sold since there is no real regulation on E85. This was figured with a 453 ft above sea level. Get your engines optimal compression ratio and total displacement in no time flat Just complete your engine setup, click calculate, and youre on your way to. ![]() The Effective Boosted Compression Ratio from your Boost of 5 psi is 13.78 : 1 I would love to hear theories about what might cause these readings and what could be done.With 11.98 compression the Boosted Compression Ratio from your Boost of 5 psi is 15.96 : 1 #7 and #4 are not that concerning to me, they’re a little low but if you lump them in with the remaining 5, they’re all within 12%. The rest of the pack falls within the recommended 10% of each other. It seems I have three outliers, #7, #6, and #4. I saw concerning results from a tool that had a bad check valve unbeknownst to me, so I sprayed the cylinders with oil to do a wet test and swapped out for a better tool rental. ![]() It’s an LQ9 block from a running Escalade, Gen 4 6.0 rods and pistons, gapped rings for boost (0.028” top and 0.026” 2nd iirc, maybe flipped), stage 2 turbo cam (Elgin e1840p), stock crank, used reproduction 823 cylinders heads (LS3 heads), ARP studs, LS9 gaskets, re-used valves, pac1218 springs, new lifters and pushrods, stock rockers.īefore putting into my ‘03 corvette, I decided to do a cold compression test today. Hello fellow engine builders, I completed my first bare-block engine build a couple months ago. ![]()
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