Performance rebuild on m30 (3.0cs)
- Thread starter posix
- Start date
sfdon is all you need to know for performance engines for a coupe. there are other excellent choices, but Don is across the bay from you on Alameda. give him a call or send him a PM on the forum. @Stevehose has the right answers up there, but Don can tell you anything about megasquirt possibilities. higher compression pistons can be found, Don probably knows where to look.
Mike Goble
Well-Known Member
There is no substitute for cubic inches. If it was me, I'd park the original long block on an engine stand and start with a 3.5l long block. It costs the same to modify the larger motor, and you are starting with a better head.
If I want to keep it carbureted, I just need the block and the head right? Everything comes from the current engine?
Suggestions...
as noted by Senor Bavarious- early heads are only valuable as a boat anchor unless you have a Csl In which case it’s a rare injected head that you need.
If you are stuck on an original 3.0 engine- that’s great but at least upgrade to higher compression pistons and a later head with the improved coolant passages.
I‘m across the bay in Alameda - almost 20 coupes and engines to look at.
it’s a rare situation where a 3.5 engine isn’t the best choice.....
as noted by Senor Bavarious- early heads are only valuable as a boat anchor unless you have a Csl In which case it’s a rare injected head that you need.
If you are stuck on an original 3.0 engine- that’s great but at least upgrade to higher compression pistons and a later head with the improved coolant passages.
I‘m across the bay in Alameda - almost 20 coupes and engines to look at.
it’s a rare situation where a 3.5 engine isn’t the best choice.....
I’m in Palo Alto, if you have time and are willing, would love to go by sometime
I’m here until Thursday? - after that I’m at CK and La Jolla tuning cars,
Back early next week.
you have a pm with ph. Number
Back early next week.
you have a pm with ph. Number
Mike Goble
Well-Known Member
The long block includes everything but the intake and exhaust. You can use your carbs, oil pump and pan, accessories, water pump, thermostat housing, valve cover, upper timing cover, etc. You will need a cam adapter nut to drive the distributor and a pilot bearing for your tranny. You may need to adapt the motor mounts depending on the year of the block. Easily done.
Honolulu
Well-Known Member
Easily, but not inexpensively.
Speed costs money, how fast do you want to go? (I've read here).
Fast, good, cheap. choose two.
But, having a BMW K1300GT with 4.5x the power of my first Bug, and weighing on 40% of the Bug, power is addicting. OTOH, look where it got your various dictators.
Speed costs money, how fast do you want to go? (I've read here).
Fast, good, cheap. choose two.
But, having a BMW K1300GT with 4.5x the power of my first Bug, and weighing on 40% of the Bug, power is addicting. OTOH, look where it got your various dictators.
Hi Mike
I am thinking of building a 3.5l M30 for my '73 bavaria. I would stick with carbs; not sure about number or draft yet; I like the sound and simplicity of carbs. I would purchase a long block, tear down etc, maybe hop up the hp a wee bit with mild cam and pistons...maybe... and transfer your list above from my 3.0 to the 3.5. However, I do not know what a 'cam adapter nut' is; please explain?
THX
Bill
Mike Goble
Well-Known Member
camshaft adapter nut 11311284801 - it allows you to run your original distributor drive with a newer cam such as the one in a B35.
#18 in the drawing...
RealOEM.com - Online BMW Parts Catalog
BMW parts 5' E28 528i Timing and valve train-camshaft
www.realoem.com
It replaces the Motronic drive for the b35 dizzy which mounts on front of cam.