highest compression ratio for 87 octane
Sometimes, a car's knocking and pinging is audible to the driver. Some high-performance engines, however, feature higher compression ratios. I bookmarked a graph that Popular Hot Rodding published. The CR on a engine can be 10-1 on one and run 87 octane just fine but that don't mean that all with 10-1 CR can because the camshaft determines the DCR. Elkman said: Octane is ONLY a measure of the pre-ignition point for gasoline. Plus you can make ethenol at home. Compression ratio is only one factor. 89 octane for 8.5:1 - 9:1. But engines with high compression ratios (over 9:1), turbochargers, superchargers, or with accumulated carbon deposits in the combustion chamber may require 89 or higher octane fuel. If your engine is experiencing knock, you need to run a higher-octane fuel. I have a 532 bbf in my mach 1 with 12.5:1 and I run 92 octane ive never had a issue and I spin her to 7k. Found inside – Page 9A mass of 3 g of tetraethyl lead would raise fuel octane value of a gallon of gasoline by five points, and since it was a relatively ... Ricardo never abandoned alcohol as a way to improve a fuel's highest useful compression ratio. I run 11.3:1 compression on pump 93 octane with a 252* @ .050 duration cam, 294* seat duration. #3. Typically if you run aluminum heads you can set your engine up to say 12:1, but since you have the aluminum heads you dissapate heat faster so you can get away with using a lower octane fuel and still get the higher compression. Though the compression ratio is 9.3 : 1, which I always considered "high compression ratio", which would require 91 or higher octane, Porsche says to use 87. Camshaft is another, and combustion chamber design is a big one. Everyone wants to get a good price per gallon, but is it more cost-effective over the long-term to shell out a little more for premium gasoline each time you fill up? Can I use 93 octane in my snowblower? Will that work on 91 octane pump premium fuel? http://www.howstuffworks.com/question90.htm, http://www.faqs.org/faqs/autos/gasol...section-1.html, http://www.adaracing.com/personal-wa...01/ya701lhdkit, Middle Tennessee Personal Watercraft Club, If this is your first visit, be sure to Found inside – Page 22The CFR engine is run at 900rpm, the compression ratio is increased, and the ignition timing is advanced. ... Shell Optimax is the highest octane fuel that is readily available in the UK, at the time of writing, and is ideal fuel for ... Pump-grade gasoline fuel 87 research octane number (RON) was We built a 400sbc that had 9.8 compression and vortec heads with a fairly big cam 230@.050 and it ran very well on 87 octane too. Found inside – Page 58But the higher compression ratio of an internal combustion engine increases its efficiency, so the problem was to get ... Therefore, its use did not raise the practical octane number beyond 87, the highest octane gasoline used in ... Found inside – Page 74The on-line Comparitor Engine method D2885 determines octane numbers that are equivalent to "lab" RON and MON values ... octane ratings are determined in a standardized single-cylinder engine with a variable compression ratio (CR 4:1 to ...
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