Author Topic: M42 race engine (Read 59691 times)

e30guydownunder · « **Reply #30 on:** January 20, 2011, 05:55:20 PM »

Seen my JE pistons that arrived fro top end performance? They are pretty nice.

Ended up $810 shipped including Heavy Duty wrist pins ($60). But I didn't get any of the lightweight or Total seal ring options that you mgiht go for.

http://www.racetep.com/jebmw.html

Was very easy to deal with these guys

Pick a bore and CR and any of the options and go.

dsm2002 · « **Reply #31 on:** January 21, 2011, 07:21:29 AM »

Hi Chris, I have been following your build with interest. I wish I had half your skill.

The head getting done at the moment with Munyard (search on PF/BMSC). I start looking at the piston and rods when he has finished.

e30guydownunder · « **Reply #32 on:** January 24, 2011, 10:41:59 PM »

Munyard = TK? You will have to keep me posted on the numbers the head starts with and gets afterwards.

dsm2002 · « **Reply #33 on:** January 24, 2011, 10:58:35 PM »

TK is in Adelaide, Munyard is in Canberra. I'll post up the results.

Slick92GS-R · « **Reply #34 on:** January 24, 2011, 11:17:00 PM »

sick !!

dsm2002 · « **Reply #35 on:** April 16, 2011, 01:17:49 AM »

I dropped over to the head guy and the M42 is close to being finished. The porting has been done, spring seats are done. The spring pressures are 80lb closed and around 200lb open at 12mm of lift. The cc'ing of the head is 35.2cc. It just needs assembly and checking, cleaning, and minor finshing the it is right to go.

To recap, I have supertech +1mm inlet and exhaust valves with 6mm stems, schmitthelm valve springs, schrick titanium retainers, Catcams 290�/275�, mechanical lifters.

Schmitthelm valve springs were being run in 6R4 metro and DFV Cosworths. They were reving the 6R4 metro with these springs to 13500 safely. :cool:

Better pictures to come.

E30PQ · « **Reply #36 on:** April 17, 2011, 11:18:18 AM »

Quote from: dsm2002;100694

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.

Do you mind if I ask what price range for the Cat cams?

dsm2002 · « **Reply #37 on:** April 17, 2011, 05:54:36 PM »

Pics:

... and the bare head:

dsm2002 · « **Reply #38 on:** April 21, 2011, 08:46:23 PM »

I am start looking at pistons and conrods. To keep it under 2 litres, I am thinking about 85mm (85x88mm = 1997cc). [Alternatively, I could go for 87x81mm.] 85mm will allow me to use a stock size Cometic MLS.

jscribble · « **Reply #39 on:** April 22, 2011, 10:00:15 AM »

I don't know how I missed this thread for so long, but this is AWESOME! Great work (esp. on the research) I know there is a lot of info out there for building a decently powerful M42, but this is about as realistically close to my "dream engine". Can't wait to hear it run!

MLM · « **Reply #40 on:** April 25, 2011, 02:55:05 AM »

Awesome project!

Possible rods in AU?

http://roccosperformance.com/shop/index.php?main_page=product_info&cPath=39&products_id=147

wannam42 · « **Reply #41 on:** April 27, 2011, 08:30:35 AM »

Where'd you get the Schmitthelm valve springs?!

dsm2002 · « **Reply #42 on:** April 27, 2011, 05:41:10 PM »

Quote from: wannam42;103389

Where'd you get the Schmitthelm valve springs?!

new old stock. The fella who did the head had them.

MLM · « **Reply #43 on:** April 30, 2011, 12:45:01 AM »

Do you have (and willing to share :p) the before and after flow improvements for the porting work undertaken. % increase at various lift etc

jscribble · « **Reply #44 on:** April 30, 2011, 12:51:48 AM »

Quote from: MLM;103457

Do you have (and willing to share :p) the before and after flow improvements for the porting work undertaken. % increase at various lift etc

+1