Nissan Versa Forums banner
1 - 13 of 13 Posts

·
Registered
Joined
·
19 Posts
Discussion Starter · #1 ·
Guys, i had port and polished my HR cylinder head, also slip the cylinder head around 0.5mm . and i found some difficulties,

on the dyno run, the power decrease 4 HP and the tq decrease 20 Nm after i did that works..

how the maximum limit in slip cylinder head on HR? and it just need to be polished only (no need to oversize the in and ex on the cylinder head )?

so i need your help,guys.. thanks..:)
 

·
Registered
Joined
·
502 Posts
i'm not sure this has been done before, but i think i've read that the versa ecu is adaptive. meaning it may take a little while for the car to figure out what you did to it. then you should see the improvements.
 

·
Registered
Joined
·
19 Posts
Discussion Starter · #6 ·
I'm considering it over the winter for my MR20 as well
Good luck,bro... :D i will waiting for the report..:thumb2:

i'm not sure this has been done before, but i think i've read that the versa ecu is adaptive. meaning it may take a little while for the car to figure out what you did to it. then you should see the improvements.
yap, you're right bro, the ecu is adaptive.. i had tried...:thumb2:
 

·
Registered
Joined
·
656 Posts
yes please some one knock this out so ill know if its worth it haha
 

·
Registered
Joined
·
66 Posts
Guys, i had port and polished my HR cylinder head, also slip the cylinder head around 0.5mm . and i found some difficulties,

on the dyno run, the power decrease 4 HP and the tq decrease 20 Nm after i did that works..

how the maximum limit in slip cylinder head on HR? and it just need to be polished only (no need to oversize the in and ex on the cylinder head )?

so i need your help,guys.. thanks..:)
It could be something as simple as that the HR16DE engine was developed with the ports being the most effecient size to begin with. By making them bigger you slowed down the velocity of air which made the engine slightly less effecient.

I'm not saying that this IS what happened, but modern engines are made to be very effecient from the factory in order to meet the tough emmision requirements of EU and US.
 

·
Registered
Joined
·
81 Posts
Guys, i had port and polished my HR cylinder head, also slip the cylinder head around 0.5mm . and i found some difficulties,

on the dyno run, the power decrease 4 HP and the tq decrease 20 Nm after i did that works..

how the maximum limit in slip cylinder head on HR? and it just need to be polished only (no need to oversize the in and ex on the cylinder head )?

so i need your help,guys.. thanks..:)
You should definitely be carefull in doing this man. My recommendation is to get a intake gasket and place it over the intake manifold side of the head and shave to make sure they would not get damaged as you do the polishing.



Cylinder head gasket
 
1 - 13 of 13 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top