Hi, I use 940 with b234 and have plan to turbo it for daily drive.
this engine dyno show 136 HP (flywheel) with 180 NM.Tq
first glance at the cam and result are
inlet 9.35mm@270
Ext 9.2mm@240head,
So i sent cam to regrind, but i have no idea about the profile, because I still blank about head flow, so i decide to strip down
At HEAD,
I found very via that intake valve are bigger (35-30 mm) but
"Intake Port is very small compare wit Exhaust port"!!?
(port size tall/wide int 26/46 mm VS 30/50 exh)
I did search but not found mention about size comparing
found Int head flow choke at approx 230 cfm. @11mm lift
I found some attempt on port size and divider porting, he got some gain only low lift?
that means inlet valve size is limit? but why exhaust port is so large?
I hope to get 260-280 CFM on this head
because the target is daily drive (100km/day on working day) with fuel economy, compression is set to 11.0 with E85 and low boost (7-8 psi)
So, please guide me,
Should I port it? if yes How?
and camshaft profile recommend?
Thanks in advance.
this engine dyno show 136 HP (flywheel) with 180 NM.Tq
first glance at the cam and result are
inlet 9.35mm@270
Ext 9.2mm@240head,
So i sent cam to regrind, but i have no idea about the profile, because I still blank about head flow, so i decide to strip down
At HEAD,
I found very via that intake valve are bigger (35-30 mm) but
"Intake Port is very small compare wit Exhaust port"!!?
(port size tall/wide int 26/46 mm VS 30/50 exh)
I did search but not found mention about size comparing
found Int head flow choke at approx 230 cfm. @11mm lift
I found some attempt on port size and divider porting, he got some gain only low lift?
that means inlet valve size is limit? but why exhaust port is so large?
I hope to get 260-280 CFM on this head
because the target is daily drive (100km/day on working day) with fuel economy, compression is set to 11.0 with E85 and low boost (7-8 psi)
So, please guide me,
Should I port it? if yes How?
and camshaft profile recommend?
Thanks in advance.