Boyracer, where did you buy this Clutch + Flywheel ?
Clutch is from US ebay, it was originally used in some NASCAR car. Paid 140€ for it and sold the three discs that came with it for 100€ so it cost me about 40€ in the end
Three puck sintered disc I have now cost about 140€ and it was bought here in finland. Custom billet flywheel is also finnish origin and it cost me 200€.
Total cost for clutch & flywheel is about 380€, not bad for 50% drop in weight and significant increase in torque capacity! :eek:
I still will need to get hydraulic throwout bearing because stock system might not last very long with super stiff NASCAR pressure plate...
I saw that you will use dbilas springs ... are there any other options for aftermarket stiffer springs?
You might want to check out Cat Cams and Shrick. I cannot remember anymore what they had to offer to M42.
And I was thinking something else ... what would be the difference between modified intake with M50B25 trottle body VS ITB from M3 E36?
Do you mean stock M42 (E30 or E36? They are totally different) intake modified to accept M50B25 throttle body? Or completely new intake with M50B20 TB?
You can get very nice intake without ITB's, here is an good example:
BMW Motorsport P54 used in WTCC with E46. 2,0 liters, no ITB's but around 300 hp.
Nice Project!
I just found some very interesting information about 35mm valves! As we know the valves from M62 Engine are little bit shorter than the stock M42 valves. Well I found this:
M3 S54 Valves 35mm X 6mm X 117.50mm (51 gram)
M50/52 Valves 33mm X 6mm X 106.10mm (those are the same as M42 Valves)
So it will be much easier to cut the M3 Valves than Machinework the Head for M62 Valves.
Thanks!
I have decided not to go for much larger valves for cost reasons.
You can get max 34 mm valves to fit in original valve seats and still have enough valve seat thickness to be reliable. 35 mm and anything larger requires changing of valve seats which will be huge cost!
Also, on 2 liter 16 valve NA engine (Opel C20EX) putting out 280 hp the difference between 34 mm valves and 35 mm valves is only 10 hp. This information is directly from Guy Croft who has worked with Hart F1 engines at the time. Now he works with many 16 valve engines and I consider him being one of the most trustworthy sources of information available.
I think that some other things will start restricting airflow to cylinder before valves get too small.
So unless you are building engine for a racing series where every singe hp count and have enough budget, 34 mm is quite enough
When I have money I think I will just order set of 34/31,5 mm Supertechs and be happy with them
