m44 what can it rev to?

[bmw2101]

I have a m44, flowed head, schrich cams, m47 crank, stadnard shaved pistons, acl race bearings, standard valves adn springs.



whats it safe to rev to?


what is the weak point? THe rods or int he head?

tahnks

[bmwconnect]

7500

[bmw2101]

i thought so but the guy building it said 7 max LOL!

[jca]

Barrie, what part of the engine do you think is the weak link? Just curious. John

[bmwconnect]

Springs for sure in the valve train and then rod bearings IMO. I have auto cross guys reving to 7500 all day long on the M42 just so they can hold a gear

[pdxmotorhead]

The M42 has better valve control than the M44. Plus a forged crank and a tick less rotating mass, I would strongly suspect the M42 will out-rev the M44 by 500 rpm.. given equal builds. Longer stroke usually means less ultimate top end rpm. If anything was going to let loose on a M44/M47 build I would guess Pistons. That build has a lot of stroke, so very high inertia on the top of the piston.

[bmw2101]

im going to get it set to 7,300 then , now ist on 7,200 but stick motor with schrich cams.


i cant wait to see what it goes like with the new motor!

[pdxmotorhead]

If your running any engine hard, not only will better valve springs be a good thing, but valve springs are a seasonal swap item, I change them every winter on race cars, and on really hot high revving engines, mid season as well.

[jwalton]

Where did you get the m47 crankshaft? I'm looking into an m42/44 hybrid build myself

[M-technik-3]

I would be concerned about the OIL PUMP.

[bmw2101]

i got my crank from a guy in ireland, i live in england.

[jwalton]

i got my crank from a guy in ireland, i live in england.
Dang, that's awesome. I haven't been able to find any for sale in the states. They are even difficult to come by on eBay.