The M90 (L-Jet) Starts pulling hard at about 1500 RPM, and goes all the way to 6.8K (as far as I have ever pushed it - … The m90 engines had a bore of 93.4mm and a stroke of 84mm. This means that this engine has exactly the same bore and stroke as the M88 and is directly related.

Its burning oil (500 miles to the quart and when I step it at high speed you can see its loosing oil through rings / valveguides, etc.)

Although at first glance these numbers may seem random, they actually have a meaning. BMW M30B35 engine reliability, problems and repair.

Originally this engine was used to test if the M88 engine was reliable with the narrow web spacing of 6,6mm. The later engines had a bore of 92mm and a stroke of 86mm. Courtesy of Mike Wassall . I've seen my friend's euro 635csi which is an '82 which has the M90 engine like mine, but has the Motronic 1.0 on it. It lost its dogleg close-ratio gearbox sometime in the past, and looks like it had been crashed, and doesn't have the tread-peeling torque I've read about M90s cranking out, so it certainly wouldn't surprise me if it no longer had the original M90 motor or ANY M90 motor. The later M30B34 engine (5/82 to 6/87) has a slightly higher CR (in Euro form), a smaller bore and a longer stroke. M90. List of Bavarian Motor Works (BMW) gasoline (petrol) engines. '81 was also the last year of the M90. BMW engine codes contain an order of numbers and letters which represent specific technical information. The M90 engine is a lower performance SOHC engine that was based on the M88/1. Help all you bmw gear heads! The factory installed 2.8 L M30 inline-six was replaced with with a 3.5 L M90 inline-six from a 1981 E12 M535i. M90 Engine Rebuild - Block Cleaning - Magnafluxing. I am having a hard time finding someone to rebuild it. My engine does not have a raised water package, but verified as an M90 by the "L" stencilled on the block, and bore size when torn down for the rebuild as.

The M90 clearly has much more low end torque than the M90. BMW E34 513i Drift car Rotary s/c 13b swap m90 eaton crazy sound - Duration: 2:10. This block is a (highly) over square (bigger bore than stroke) 3.453 liter creation.

Although at first glance these numbers may seem random, they actually have a meaning. It utilizes the same block from the M88 and maintains the same bore and stroke, but borrows its head from the BMW M30 engine family.

M90. The BMW M30 is an inline-6 cylinder engine built by BMW and was used in many different models since 1968. My E24 with an M90 has a build date of May '81.

For a total weight reduction of over 6.5# (2910g). Possibly the best engine BMW have ever produced in a lot of respects. Renowned at the time for their smoothness and effortless power delivery, road testers of the time waxed lyrical, although time soon showed that not everything in the garden was rosy. It is a first year Motronic and according to Andreas Hartz of Mobil Traditions in Germany, original. BMW’s small capacity 6 cylinder engine arrived in 1977, and was first fitted to the E12 and E21 ranges of vehicle in 2 and 2.3 litre varieties. Overview: BMW M30 cylinder heads are at the same time the best and worst part of the engine, giving good power output even in the difficult smog years of the 70's and early 80's, but also having an alarming propensity to crack, but some more than others. In spite of the fact that M30 produced along with M20 (straight-6), M30 has more common with younger 4-cylinder M10. If I had a choice of powertrains for an E9, I would use an M90 L-Block, a getrag 265 standard ratio trans and a 3.07 diff. the bore is 93.4 mm and the stroke is 84 mm. The piston and rod assembly in a MM 3700 Rally engine is just 950g vs 1435 grams for a stock BMW M30 engine. The piston and rod assembly in a MM 3700 Rally engine is just 950g vs 1435 grams for a stock BMW M30 engine.

The motronic engine you have was used between mid 1980 and 5/82 and it shares bore and stroke dimensions with the earlier L-jet fuelled M90. The M30B35 comes alive at about 3500 RPM, and goes well from there to 5.5K, and which point it levels off. The M90 engine uses a M88 block and M30 head. 6 Cylinder Engine Kits – M30 3.0cs, Bavaria, 5, 6, & 7 Series ≥’93.

It utilizes the same block from the M88 and maintains the same bore and stroke, but borrows its head from the BMW M30 engine family.

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