Abit's 318iA m20b30 + pssycat cam and more...

[abit]

As I noticed before, participated in some local forum track day, damn, so much fun :D
preparation ;D


good enough


first mounted some shitty rubber and we are ready :D


so... some driftin


and later some time attack


nice race/stance :D


@ afterparty with some old bangers :D


something like that, enjoying last season weeks :( :D

[litu]

Dam that red one looks cool...What is that white e30, looks interesting :)

[abit]

kinda winter started here in Latvia, so car gone to winter sleep
lil bit snow :D


buut then, incidentally bought new wheels :D
Intra's 16x9
and actually I'm very pleased
In life looks even better...of course






but otherwise still banging with compact


Stay tuuund

[abit]

here we go again
let's stroke dat shht lil bit up :devil:


dayumn, just noticed, my post count... right there i'm going :D

[efficient]

It's going to be a 3.0 m20?

[Northern]

84mm crank with ~86mm bore?
or 89.6mm crank with 84mm bore?

[abit]

yes, it's going to be something about 3 liters m20

90mm m57 crank
135mm m52/m54 rods
and m54b25 pistons
84mm bore

[mila325]

Got tired of the 2.8? Might I suggest going ITBs if you want to stay N/A? Would give a GREAT boost of power with the extra stroke.

[abit]

Got tired of the 2.8? Might I suggest going ITBs if you want to stay N/A? Would give a GREAT boost of power with the extra stroke.

yes and no... of course, let's be honest, everyone wants more and more poweeer :D
but in reality engine started to make piston slap while cold, i believe 2 years already now? so I decided that I should mend it, and make something different :)
yea, i thought about that many times, but it's not cheap upgrade at all, maybe some day there will be ITB's, but that's not in nearest plans for this car.

[mila325]

yes and no... of course, let's be honest, everyone wants more and more poweeer :D
but in reality engine started to make piston slap while cold, i believe 2 years already now? so I decided that I should mend it, and make something different :)
yea, i thought about that many times, but it's not cheap upgrade at all, maybe some day there will be ITB's, but that's not in nearest plans for this car.

So going for a cheap 3 litre stroker? Let me know how it goes! Any idea on how long until done? :D

[abit]

So going for a cheap 3 litre stroker? Let me know how it goes! Any idea on how long until done? :D

Yes Sir!
for sure, errm, now block is disassembled, I hope tomorrow I get crankshaft and then some measuring, machining, aand putting together, as fast as possible, as always :D

[mila325]

Yes Sir!
for sure, errm, now block is disassembled, I hope tomorrow I get crankshaft and then some measuring, machining, aand putting together, as fast as possible, as always :D

So before the end of the year? ;) I want to see burnouts with all the extra torque! Any plans outside of the motor?

[abit]

So before the end of the year? ;) I want to see burnouts with all the extra torque! Any plans outside of the motor?

that's impossibruu :D I believe first start could be about @ february.

many things should be fabricated, made to fit etc.

also thinking about 240mm clutch, using m30 disc and m57 pressure plate, but that assembly is thicker than m20 assembly, needs ''longer'' throw bearing, don't know, maybe from e21 or smthng?

also some while ago I thought about m3 fenders and bumpers (fiberglass), but then there is problems with MOT, will see..will see :)

[abit]

dayumn, almost forgot, every years acceleration video :D
this time pretty crappy quality..
compare to last year, just lil bit different exhaust, adjusted cam(in both thank's for advices goes to Digger ), and different differential ratio

[abit]

Of course, first test assembly, then measuring :D

bolted in one piston, aand it's not below deck, but above, fail...
later done some measurements and that actually should be like that :D
45 + 135 + 27.8 = 207.8 (if we believe that m20 block deck height is 206.7 or 206.2?)
means about 1.1 or 1.6mm over deck, in reality something closer to 2mm's, of course that's not precise measuring, but for test fitting, it's ok :D


so there is two alternatives:
1. shave off material from piston
2. 130mm rods

as we know these are one of thinnest 84mm pistons, so there in not much material from top compression ring to piston head..
what could be the smallest distance piston to top? so it won't overheat top rings and piston won't crack details out :/
i believe 1mm off, could be enough for me
if now its something about 5mm, what I think already is really low


I don't tried second (130mm rods) thought but i believe that its not actually possible because of crank counterweights could hit piston skirts and m20 rods maybe won't rotate in block

aaand so big stroke and short rod on 84mm bore could be not best idea, right?


some comparison
m54b25 m52b28 late m20b25