The displacement of the engines is the same. identical bore and stroke Although the combustion chambers themselves are bigger, nothing has changed.
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BMW M30
From 1968 through 1995, the BMW M30 was a SOHC straight-six petrol engine. It was utilized in many different automobile models and had a 27-year production run, making it BMW’s longest-running engine.
The BMW 2500 and 2800 sedans were the first models with the M30 engine. The first M30 vehicles were made in 2.5 liter (2,494 cc) and 2.8 liter displacements (2,788 cc). Over time, models with larger displacements were created, with the largest having a displacement of 3,430 cc (209.3 cu in), which was occasionally labeled as “3.5 litres”. The M30’s four-cylinder BMW M10 engine, from which it was derived, has an overhead camshaft with two valves per cylinder, an iron block, and an aluminum head.
When the smaller BMW M20 straight-six engine was introduced in the late 1970s, the engine was given the designations “Big Six” and “Senior Six.” Before the BMW M70 V12 engine was introduced in 1987, the M30 was BMW’s most potent and substantial regular production engine. The M30 was produced alongside the M20 during the M20’s lifespan.
The M30 engine started to be phased out in 1990 after the release of the BMW M50 engine.
Layne
In fact, I fail to see why it would be impossible to just mount the B35 head on the B34 high comp engine. Compression should be lower than the 10:1 B34, but probably not much lower than the 9:1 B35 or even lower than the 8:1 B34. It may therefore perform even better than the B35 head and B35 pistons. Who even knows if the “improved” combustion characteristics that the B35 pistons are supposed to have were ever accomplished. Although the B35 head has a little more area, the head form is essentially the same. Compared to the B34 head, you lose portion of the squish cushion, which could result in a slight torque loss. Since the combustion chamber is larger overall, the piano top pistons shouldn’t have any possibility of colliding with anything (always check anyway). A combination of the pieces should put you between 208 and 210 horsepower.
Engine reliability, issues, and fixes for the BMW M30B35
The big inline 6-cylinder M30 engine took the place of the BMW M60 series (V8) before it was replaced in 1992. Despite being developed alongside the straight-6 M20, the M30 shares more traits with the more recent M10. The original M30 motors debuted almost 50 years ago, and since then, they have undergone steady advancement and modernization. One of the best versions, designated for BMW vehicles with a 35i index, was M30B35/M30B34 and introduced in 1982.
The cast iron straight-6 cylinder block is used by the BMW M30B35/M30B34. It is the same as at M30B30, but the crankshaft has an 86 mm piston stroke and a 92 mm bore. The cylinder block’s height is the same. M30B35 piston compression height is 39.85 mm, and rod lengths are 135 mm.
cylinder head M30B34/B35 with 12 valves and one SOHC camshaft. Since this engine lacks hydraulic lifters, you must adjust the valves every 5,000–7,000 miles (or 10,000 km) of driving. Inlet and exhaust valve clearances (cold engine): 0.3 mm.
The M30B35 camshaft has the following specifications: duration 248 degrees, and lift 8 millimeters. It was altered to the intake manifold. On the M30B35, the fuel injector size is 214 cc/min. The BMW M30’s firing sequence is 1-5-3-6-2-4. Timing chains initiate movement of the camshaft. The injector in the fuel system.
Various iterations of this engine were made:
1. Engines fitted with low compression pistons (CR=8), catalytic converters, and Bosch Motronic 1.0. At 5,400 rpm, the M30B35 has 185 HP of power.
2. Motors with brand-new pistons but no catalytic converter (compression ratio is 10:1). At 5,500 rpm, they have 218 horsepower.
3. The catalytic converter, unique pistons (9:1 compression ratio), and Bosch Motronic 1 variant.
3. These motors have 211 HP at 5,700 rpm.
tuned BMW M30
“Everything you need to know about performance and tuning components for the BMW M30 engine!”
Our goal is to outline the most significant modifications and offer a guide to M30 tuning. With a few practical performance modifications, such as remapping or aftermarket ECUs, head work, turbo upgrades, and camshafts, you may really up the pleasure factor of your driving.
After 1985, the engine improves significantly, gains more power, and provides a better foundation for development.
Keep in mind that this engine has undergone major alterations throughout the course of its very long production cycle. We will presume one of these more current engines because the majority of our readers own later models, however we do encourage you to speak with other users in our forums and online to find the best modifications for your M30.
Although the M30 is exceedingly strong and robust, early models begged for additional power. They are extensively supported with upgrade parts and tweaking choices, so we are not surprised they have such a large following.
On a b34 are pieces from a m30b35.
I will be installing a m30b34 that I entirely rebuilt from an E28 535i 9/86 in my 1989 325is. I have access to an E32 735iL auto 4/88, and I’m wondering what components I should remove from it and install on my engine. I can get everything off of it for $100. I’m ordering the ECU, wire harness, injectors, ICV, CPS, and wheel since I want to upgrade to motronic 1.3. What else should I get to create the best-looking, best-running engine I can for today and improvements to come?
The subsequent B35 starter is lighter and smaller and functions just fine. Oh yeah, B35 down pipes and exhaust manifolds. I believe the B35 air cleaner looks a little better.
Never try to reason with idiots; they will bring you down to their level and outsmart you with their experience. by Mark Twain