M20 B3x Naturally Aspirated Stroker build past, present and future

[F34R]

I love seeing what can be pulled out of the m20, I really want to build my m30 up like these m20s.

[Luis325]

Nice work man!

[CorvallisBMW]

Wow, not sure how I missed this thread until now. Amazing work and knowledge!

[digger]

a little progress

still need to build up some top coats of epoxy and cut it back smooth to get rid of the textured finish

[MasukBMW]

Bump! Need more now.

[The Dark Side of Will]

Yeah... DIY composites are pretty badass, especially with ETC resin.

[LJ851]

Fantastic !

[digger]

been making an airbox to seal off the throttles

some 50mm extruded polysyrene sheets

i laminated the sheets to build them up to about 250mm deep but you can get the stuff that thick





some woven glass twill and epoxy resin still building up enough layers. no pics of mould but you get the idea. i did test fit the foam mould and scultured it to fit in but obviously could not see how the trumpets fit inside. it clears the hood and booster





a laser cut aluminium plate that will be incorporated into the plenum sandwiched between the adapters and trumpets



hope the darn thing fits......it will need a removable lid to bolt the trumpets inside. i might need to get some slightly curved extensions for number 1 and 2 to curved them down ever so slightly get them inside

i need to make an oven to post cure the epoxy at 80C for 8hrs to be able to handle the temps

[litu]

Awesome project :)

[SkiFree]

Bout time you put this into writing, looking forward to seeing where you go with this.

[Bmwdayz]

Seriously awesome dedication to the M20!

[JasonBates]

Mother of God. This is awesome.

[mccor023]

Im so stoked your putting a build together, Ive admired your engine since seeing your sig on e30tech when I first got mine. I look forward to reading through all this.

[digger]

Currently working on a plenum/airbox for the ITB to ensure that cool air is fed to the engine. IAT of 65 to 70C in traffic on stinking hot summer day are not great nor is the flow and filtration of foam socks....

ive made a extruded polystyrene mould that fits into the engine bay. just going to wrap it with fibreglass weave cloth and a post curable epoxy resin so it doesn't soften at 50C like most epoxy resins do. i should be able to get the wall thickness quite thin but not like carbon would be
the trumpets go on the inside so it needs a removable lid.

the foam will be dissolved with acetone

im still not 100% certain that all trumpets will fit inside and that there will be enough clearance to the booster and hood with movement of the engine on the mounts so thats why i am not using carbon fibre or anything exotic. i should be able to get it to work though.

[The Dark Side of Will]

Thanks!