Author Topic: M42 race engine (Read 59710 times)

Boyracer · « **Reply #15 on:** July 05, 2009, 03:09:26 PM »

Awesome to the max! :cool:

Where did you get the supertech valves and how much?

Bunta · « **Reply #16 on:** July 05, 2009, 04:41:28 PM »

So the ports line up? the mounting is the only issue?
Simple change I might have to look into these.
Looks great, there 46mm?

Im interested to see what kind of power this thing puts down.

Hunter

dsm2002 · « **Reply #17 on:** July 05, 2009, 06:32:59 PM »

The valves came from an ebay supplier - Performance Closeout. They had listed the 6 cylinder kit for the M5X and I emailed them to see if the could supply just 16 rather than 24. Price was just over $300USD. I went for the single groove valves with collets (part nos BMIVN-1031S and BMEVN-1031S) which are better for high revs.

The TBs are 50mm (huge!) ... 46mm probably would have been better. They line up but will need port matching. Everything downstream of the TBs, ie. ports, valves cams, pistons, headers, exhaust, etca. will need to will need to be appropriately worked on to use all that air from the large TBs. I have someone lined up for the head work.

e30guydownunder · « **Reply #18 on:** January 19, 2010, 07:56:27 PM »

Any updates on this Dave?

dsm2002 · « **Reply #19 on:** January 20, 2010, 07:52:34 AM »

I am currently fitting suspension bits: 24mm/16mm Whiteline bars, Bilstein Sports, F&R height adjusters, 300lb/450lb springs, front Noltec camber plates, Treehouse front LCA bush, AKG bushes, rear toe/cambers plates and E39 eccentric bolts.

e30guydownunder · « **Reply #20 on:** January 26, 2010, 05:20:37 PM »

Those are the spring rates I am currently running, I think it is close to spot on for our less than smooth circuits

Keep us filled in on any progress.

dvmotorsports · « **Reply #21 on:** January 26, 2010, 07:14:51 PM »

More pics of the roundie plz.

dsm2002 · « **Reply #22 on:** January 27, 2010, 10:32:01 AM »

Here it is ...

dsm2002 · « **Reply #23 on:** November 19, 2010, 07:02:41 PM »

I need to update.

Going slowly with my M42. I picked up a M47 crank from joe318is/Hick on R3vlimited. With 85mm pistons = 1997cc. I want to keep it under 2 litres.

I have also dropped off the head to an engine builder for some work. He is fitting the +1mm Supertech inlet & exhaust valves. I have gone for 6mm stems and have some 6mm Metric Mechanic valve guides. Once the head is done, I�ll start looking at cams, springs, pistons, rods etc.

I may be getting the head flow tested. I'll post pics and figures.

dsm2002 · « **Reply #24 on:** November 19, 2010, 09:43:47 PM »

One problem. The collets for the Supertech valves with 6mm valve stems do not work with the standard retainers for the E30 valves with 7mm stems. The hole is too large. I was initially thinking about getting Ti retainers. The engine builder says the M42 retainers are well made and quite light, so I have ordered some E36 retainers (11 34 1 724 991) - 6mm valve stems used after September 1992.

dsm2002 · « **Reply #25 on:** December 16, 2010, 07:45:20 AM »

OK the e36 retainers have arrived. They weigh about 12g compared to 19g for the E30 retainers. It looks like BMW went to a lighter retainer for the single valve springs of E36s, compared to doubles for E30s. I am not confident about using these retainers with heavier rate double valve springs. Bummer

E36 valve train

E30 valve train

dsm2002 · « **Reply #26 on:** January 19, 2011, 09:01:53 PM »

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.

dsm2002 · « **Reply #27 on:** January 19, 2011, 09:06:59 PM »

I have a distraction from M42 business. The M40 in my daily driver died, so I am fitting the M52B28.

Daily:

jakeb · « **Reply #28 on:** January 19, 2011, 09:17:45 PM »

you should put that stroker in the 2002....

dsm2002 · « **Reply #29 on:** January 19, 2011, 09:58:41 PM »

I have a S14 for the 2002