Author Topic: evo pistons? (Read 6065 times)

318isteve · « **on:** January 08, 2009, 01:04:45 AM »

Hi there ive heard evo 6/7 pisonts will fit into a m42 with a bore to 86mm does anyone know more about this wether they will or not?
cheers

Froos · « **Reply #1 on:** January 08, 2009, 04:27:44 AM »

you mean the pistons out a Mitsubitsi Lancer evo?? Try to make your question more clear.

nuvolarossa · « **Reply #2 on:** January 08, 2009, 05:29:05 AM »

the angle between valves is a bit different... if you read that in one of my old threads redo every calculation from the start for your safety

I gave up because I had no freetime at the time when I saw that valve angle was different. I need to find my old threads to remember the details...

EDIT. Here is my old thread, but you need to know that some numbers are "guesstimated" like chamber volume and deck height:o
so start from zero or reply that thread if your able to make the calculations and not trust those numbers that CAN be wrong.
http://forums.bimmerforums.com/forum/showthread.php?t=903532

dsm2002 · « **Reply #3 on:** January 08, 2009, 06:52:35 AM »

I noticed in passing another possible candidate i.e. Toyota 3S-GTE DOHC 16v. I am not sure if this has been considered or not. Just throwing it out there.

Details from ACL are:
Bore Size:         86mm/3.386in
Compression Height     34.9mm/1.375in
Piston Crown Capacity     9cc Dish
Bowl Depth        3.41mm/0.134in
Piston Mass        362 grams
Pin Mass          91 grams
Pin Diameter       22mm/0.866in
Pin Locking Device      Spiral Lock

nuvolarossa · « **Reply #4 on:** January 08, 2009, 07:47:13 AM »

Yes, I considered them but I wrote nothing and I don't remember why!
There was another candidate too but I don't remeber it now...

need to recheck the files in my hard-disk!

Schwarz_Bomber · « **Reply #5 on:** January 08, 2009, 09:07:12 AM »

i am interested on this. i mean, is there anything out there that is a direct swap compatible? ex: direct piston swap with pistons from another car reguardless of make, that would help with boost.

318isteve · « **Reply #6 on:** January 18, 2009, 01:02:51 AM »

yes mistubuishi ebolution sorry.
oh ok i dee looks like to much work,
anyone else know of the 3s-gte pistons being used or compatable?

E36Al · « **Reply #7 on:** February 23, 2009, 12:31:01 AM »

Nissan sr20 pistons are 86mm bore and 22mm gudgeon, have similar compression height to m42 and are very strong and cheap. The 3sgte comp height is too tall. you'd need a 4mm head gasket. The sr pistons need flycuts for valve relief. They have a 5cc dish before flycutting and afterward with a 1.7mm headgasket my engine is 8.6:1 static comp with m42 conrods. Cost me $50 aud for four s/h sr20 s15 silvia pistons and rods. cant use rods though b/e too large. Cheers Al