M42 head work

[bwawuz02]

the dyno chart at the bottom of this page make me very optimistic for my build to dyno 160-170 at the wheels. Considering my displacement is equivalent sans 2 cylinders and i'll be running the ITBs If I can put 170hp to the wheels at 6k rpm I'll be screaming joy all the way to 7.8krpm. If my mystery spec regrinds don't do the trick I'm either gonna copy cat ralph or possibly pick up CatCams.
 
http://dynospotracing.com/charts/E36_M3_95DSR.html

[wannam42]

Very interesting. Subscribed. I'm in for the specs and pics of the new intake. I'm still collecting parts, info, and $$ for my stroker build.

[Warsteiner]

This is what I measured on a scale:

Lifter Bucket:
M42/S50                       M42 Light                 M42 Stock
33mm= 44.0gms      35mm= 64.5gms      35mm= 77.09gms
44x16=704gms         64.5x16=1,032gms   77.09x16=1,233gms

Keeper:
M42/S50                       M42 Light                 M42 Stock
   1.0gms                       1.0gms                   2.5gms
1x16=16gms                1x16=16gms          2.5x16=40gms

Retainers:
M42/S50                       M42 Light                 M42 Stock
   8.0gms                       10.0gms                  19.0gms
8x16=128gms               10x16=160gms       19x16=304gms

Springs:
M42/S50                       M42 Light                 M42 Stock
Beehive= 37.0gms      Beehive= 45.0gms      Dual Spring=62.0gms
37x16=592gms           45x16=720gms          62x16=992gms

Intake Valve: (x8)
M42/S50                       M42 Light                 M42 Stock
33mm= 45.5gms        33mm= 45.5gms        33mm= 58.5gms
45.5x8=364gms         45.5x8=364gms          58.5x8=468gms     

Exhaust Valve: (x8)
M42/S50                       M42 Light                 M42 Stock
30.5mm= 46.0gms      30.5mm= 46.0gms   30.5mm= 54gms
46x8=368gms             46x8=368gms           54x8=432gms     
 
Total:
S50 Light                 M42 Light                  M42 Stock     
2,172 grams            2,660 grams              3,469grams
4.79 lbs                    5.86 lbs                     7.65 lbs

S50: Save 1,297 grams or 2.86 lbs of Total Valve Train Mass over stock.

S50: Save 488 grams or 1.08 lbs of Total Valve Train Mass over the M42 Light.

M5X: Save 809 grams or 1.78 lbs of Total Valve Train Mass over stock.

I have changed and fixed the Math on page 2 and 3 (Thanks for pointing that out Jesse aka bwawuz02) in this thread and resurrected it since it might be beneficial to a few people building engines now
And maybe one day we just might have a 32 valve M42 engine....LMAO

Cheers,
~Ralph

[ziaius]

found something interesting on MM heads:
https://patents.google.com/patent/US4976248A/en

[inline]

found something interesting on MM heads:
https://patents.google.com/patent/US4976248A/en

its a shame they never did anything to prove the merit. or perhaps they did tests and didnt want to publish results...

having used one of their complete heads i cant really say it performed any better than the tradiional approach.

personally i think the scale and size of the features is too large, a rough texture (burr finish or extremely coarse grit) can be good for wet flow and even dry in some cases this has been tested but you dont reallly need large steps which have the issue of creating dead pockets and hot spots within the chamber...