sounds interesting :) i'll be staying tuned into this one for sure. Let me know when you are getting the cams posted out might wanna combine on shipping.
Is this horsepower predictor on the internet or elsewhere?
I know that software :D if you really want it you can buy it.
In your list I would say HEAVY head porting and maniacal attention to its flow... that software is VERY influenced by head flow ;)
the funny thing is that I done a similar analysis two weeks ago with same throttle bodies and same cams :)
If you watch catcams website there are for every cam all the details needed for the calculator.
I will stay tuned too :) want to see those lifters working :)
Good plan! :cool:
Dont forget that you need aftermarket forged pistons and most propably con rods too which add to expense. And I would think valve springs need to be changed too.
I had been considering N62 inlet valves which are 100.04mm in length - 6.28mm less than std M42 inlet valves (106.32mm).
Now the recommended Catcam solid lifter for the M42 is CC005 which has the following specs. [Dbilas parts no. 80.500.008 for BMW 318is / VW / Audi 8V / 16V has basically the same specs as the Catcams.]
CC005 Follower specs
External dia. 34.97mm
Internal dia. 33.0mm
External ht 26.3mm
Internal ht 14.7mm
Stud dia. 6.9mm [Dbilas 8mm]
There is another Catcams follower the CC068 which is a similar dimensions more or less, which is 5.30mm longer centre post.
CC068 Follower specs
External dia. 34.97mm
Internal dia. 32.9mm
External ht 30.0mm
Internal ht 20.0mm
Stud dia. 7.0mm
Excluding the under bucket shim, the net height of the M42 valve and CC005 solid lifter is 106.32 + 14.7 = 121.02mm and the net height of the N62B valve and CC068 solid lifter is 120.04mm (100.04mm + 20.0mm). Nearly 1mm difference, which could be taken up with different lash caps.
Now I understand that the N62 valve has a 5,97mm stem which is undercut to 5,03 mm. Great!
Cost for me put an end to this course of action.
References:
(1) Catcams.be
(2) Boyracer's quest for NA 280 hp (http://www.m42club.com/forums/showthread.php?t=6396)
(3) Cecotto's stroker (http://www.m42club.com/forums/showthread.php?t=1385)
(4) other various sources
Finally, I am led to believe this is a M42 in Gerhard Landl's 318iS in the vid (see link).
Gerhard Landl BMW 318is (http://www.livevideo.com/video/94624D81D8244B12A077FD5AD3B01A15/bmw-absenger-318is.aspx)
Anyone know more about this car?
A problem you will run in is that if valve stem is 6 mm shorter, also valve spring must be 6 mm shorter because upper spring retainer (?) is attached to end of the valve stem which would be shorter than OEM.
I have received a parcel from VAC Motorsport - Catcams 290/275°. :)
I am now looking at retainers and collets, forged pistons and conrods. Schrick have advise me that Schrick 0284 13 010 retainers with either 0894 13 8K6 or 0894 13 8L6 keys/collets will be suitable.
The current spec will a stroker M42 with 88mm crank, 50mm E36 M3 TBs, mechanical lifters with under bucket shims, 34mm/31.5mm valves with single groove 6mm stems, Catcams cams 290/275°, Schmitthelm valve springs.
Where'd you get the Schmitthelm valve springs?!
Do you have (and willing to share :p) the before and after flow improvements for the porting work undertaken. % increase at various lift etc
What hardware are you running on the bearing caps? ARP? Do you see the need of strengthening the caps e.g. bearing cap cradle? I ask this because I want to build mine up on the stock crank and 86mm custom pistons but want to run it up to 9000 possibly 9500rpm.
Forget 9000 without dry sump, I wouldn't recommend more than 8500.
this seems like an interesting build. what stage is it upto?
what sort of head flow numbers did the porter achieve?
this seems like an interesting build. what stage is it upto?
what sort of head flow numbers did the porter achieve?
Is it just me or is all the pic's gone?
Can't see any of them...
BTW Any update on the build, im corrently stroking my m42, going s50 itbs and so on :)