öhh det närmaste du kommer en m20b27 är ju en m20b25 med dieselvev å 320 stakar(osäker på de sistnämnda dock) så är ju fel att påstå att det skulle finnas någon b27, är du säker på att du inte menar m20b20 som har 125 hästar?
verkar som att jag har fel efter att forskat lite i det, motor existerar men är helt okänd för mig innan nu.
saxat ifrån wikipedia:
M20B27
The 2.7 L M20B27 was designed for efficiency (thus the e for the Greek letter eta in 325e). It had an 84 mm (3.3 in) bore and a longer 81 mm (3.2 in) stroke for a total displacement of 2693 cc. The eta engine used the same "200" head casting as the carbureted 2.0 liter and K-jetronic 2.3 as featured in the E21 but only utilizes four camshaft bearings for reduced internal friction. The heads still have seven journals cast into them though and can be drilled to oil a seven bearing cam.
Output was 122 hp (91 kW) at 4250 rpm for all models produced through model year 1987 and 127 hp (95 kW) at 4800 rpm for the final year of production in 1988. Peak torque is 170 ft·lbf (230 N·m) at about 3250 rpm for all years of the eta. This was the first engine BMW built with fuel economy as the top priority. In production it was coupled to either a 2.93:1 differential for the E28 5 series and most E30 3 series models or a 2.79:1 for early E30 3 series cars with manual transmissions. The tall final drive gearing was required to keep the engine in its best operating range at various road speeds. These features did achieve exceptional efficiency, but at the expense of the performance typically associated with the marque.
All eta engines used Bosch Motronic engine management systems that were calibrated for maximum fuel economy. The result was a very conservative spark advance curve and fuel delivery curve. In addition, the Motronic had a built-in rev limiter that engaged at about 4750 rpm. This very low redline was the result of the four bearing cam, soft valve springs, intake manifold and camshaft design. Due to the very low overlap and short duration of the cam and the intake manifold tuning, the motor does not make any power over about 5,000 rpm.
Starting in cars produced from September 1987 for the 1988 model year, the eta cars got a more substantial refresh from the factory. This included the more recent Bosch Motronic version 1.1/1.3 with adaptive idle control and revised circuitry, the "885" head casting with the larger valves, ports and revised combustion chambers, new pistons to fit the 2.7 L stroke with the 2.5 L head, a special one year only intake manifold with even narrower runners that opened up at the flanges to match the larger ports of the new head, a dual exhaust system and a 5300 rpm rev limit. A new 6000 rpm tachometer was also used. Though it only made slightly more power in stock form, it could be easily boosted by installing a 325i cam and springs, a complete 325i intake manifold and throttle and plugging in the 325i engine control unit. Depending on which cam, chip and intake is used, the combination can make over 200 horsepower (150 kW) with the stock compression ratio.
In aftermarket modifications that are inspired by custom versions of Alpina and AC Schnitzer, the long-stroke eta engine block is often combined with a 325i head to a so-called 327i that combines the high low-rev torque of the eta with the top-range power of the 325i.
Applications:
1982–1987 E30 325/325e/325es
1982–1987 E28 525e (or 528e in the US)
Senast redigerat av Lindberg88 (3 mars 2009)
Säger precis som jag tycker och tänker! Har alltid gjort och kommer alltid att göra det :)
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