![]() ![]() ![]() This fractional distillation process yields approximately 250 mL of straight-run gasoline for each liter of crude oil. The crude oil is separated according to different boiling points into fractions. Gasoline is most often produced by the fractional distillation of petroleum, also known as crude oil (it is also produced from coal and oil shale). Virtually no alkenes or alkynes are present in gasoline. Smaller amounts of aromatic compounds are present. Most of these are alkanes with 4-10 carbon atoms per molecule. Gasoline consists of a complex mixture of hydrocarbons. You may wish to experiment to see if you can use a grade lower fuel without creating engine ping, in order to be optimally cost efficient. Consult the appropriate engine manual or vehicle owner's manual for the suggested minimum octane rating. This method of calculation is good for all internal combustion engines, including automotive or general aviation. You may however, change the values appropriately. We have inserted potential defaults that are correct for the most popular octane rating of 87. To use our calculator, simply enter the Research Octane Number and the Motor Octane Number click on Calculate and the minimum octane number, what you see at the pump, is returned. A gasoline with an octane number of 92 has the same knock as a mixture of 92% isooctane and 8% heptane. Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock). Octane rating number is defined as a value used to indicate the resistance of a motor fuel to knock. This calculator determines the minimum octane rating, also known as the knock index, by the formula (R+M)/2. less the 28cc head, piston space is 31.04cc.This calculator requires the use of Javascript enabled and capable browsers. Early engines had a 36cc head chamber, so the piston space is 25.85ccįor a 3.9L, 8.13, static = 493/7.13 = 69.14cc. Static vol = Swept volume / (CR-1), static being head space + piston crown space.Įg for a 3.5L, 8.13 CR, static =441/7.13 = 61.85cc. preferred engine now is 3.9L, small chamber heads with composite gaskets.īTW, to calculate the volume of the static combustion space, use the following. similarly the 9.35 CR in S2 Discos with 3.9 engines, with R380 5 speed, is very nice to drive. in my experience the 8.13:1 cr has a great low end, but doesnt rev well 10.5:1 has a great top end, but poor bottom end, revs well - ideal for an auto 9.25:1 is the all-round sweetest - decent bottom torque, and revs well. not to say the cam has no effect, but its harder to change. I have found that the combination of CR and ignition advance has a big effect on an engine's ability to rev nicely, and where its torque peak is. What exactly dictates the compression ratio of a Rover V8 engine? Is it a matter of the top of the piston having a deeper dish shape than a higher compression engine? Or are there other differences as well? I suppose what I'm wondering is if it would be possible to increase the comp ratio of this old 3.5 litre V8 'simply' by fitting different pistons? I (we) welcome your thoughts, wise ones! In the meanwhile he's gone and blown a bunch of money on a very rapid 'modern', and apart from having seriously depleted his bank account, he is realising even if he fitted a brand new Corvette engine his old P5 is never going to handle like his new vehicle, despite all the suspension mods and braking upgrades he's had done to it! So he's now thinking about sticking with the RV8 after all, but perhaps refurbishing it before refitting it. I am quite literally "asking for a friend"! At one point his plan to was to ditch the old Rover engine altogether and fit a substantially more powerful V8 from a more modern car. Whatever, it is what it is, but could it be made to be "a bit more"? Going from the engine numbers list over on the V8 Owners Forum we think it may originate from a '70 - '83 Range Rover. I was surprised to discover the engine has a low compression ratio of 8.13:1. It is currently languishing in a corner of my garage while he further modifies his front subframe, which he has previously adapted to take independent dual wishbone suspension and a steering rack from a Granada. Last year I helped a good mate of mine to yank the V8 engine and automatic gearbox out of his P5B saloon. I hope everybody will go easy on me if I'm asking stupid questions.
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