M43 valves in M20 head

[abit]

ok, this mod is done, today was first drive with my fresly built engine, seems like its working fine :)
so... made spacers for valve springs (1,4mm), @ start


after some while :D


also valve stems were shortened, actually, talked about that with one local engine builder, he actually told that I maybe could not shorten them, because rocker eccentrics would compensate valve length, buuut then I checked this theory, and reality is that you just can't install rockers at all, becouse they wont slide on valve :D so removed 1,3mm


and there all together

[Ether-D]

Cool bro. Keep us updated. Good job.

[downforce22]

Its neat to see this done, but I don't see the value in all of this work? You add spacers which is more weight to lose 13 grams per valve.

[nando]

the spacers are on the bottom, they don't add to the valvetrain mass.

[abit]

Its neat to see this done, but I don't see the value in all of this work? You add spacers which is more weight to lose 13 grams per valve.

wait, what? how these spacers can add moving mass for valve/spring if its at the bottom and does nothing to that :D

also modifying these valves and spacers was cheap as fck and easy to install, so why not?

[abit]

Cool bro. Keep us updated. Good job.

recently dyno'ed engine, don't know if these valves helped to gain more or even lose power :D but result is like this... about 6500 km's driven and all still looks good :)

[mr2peak]

Anyone else do this?

[abit]

Anyone else do this?

I belive no :D

[redlightpete]

That's a pretty solid power number. What cam is that?

[digger]

Dont forget this a euro dyno so crank estimation. Hp at wheel is 160

[abit]

That's a pretty solid power number. What cam is that?

http://www.catcams.com/products/camshafts/datasheet.aspx?ENGINE_id=111&CAMSETUP_id=265

Dont forget this a euro dyno so crank estimation. Hp at wheel is 160

Jep, these are numbers on engine. But still, I think It's pretty ok for m20b28.

I will try to make some minor changes in exhaust/ adjustable cam sprocket, maybe engine will become more funny as It is :D

[digger]

catcams seem to like some advance, i think they must have wide LCA and so need it to build some dynamic comrpession