ok so im building a poormans CTR...b16a2 block stock crank and rods with a stock GSR head...what pistons will give me the best compression ratio?...oh and im building it N/A

 

p3f oem piston is the best one ever made for your 81mm engine...thumbs up

 

DISAGREE completely. Do you know what you are talking about? that would give him an effective CR under 8:1... FAIL

Why would you recomend the b20 pistons when he is doing a NA setup? just wondering.

If you are doing a CTR setup why not go with the CTR pistons? If you arent going to run Type R cams then it will be overkill, but if you plan on upgrading then i feel its a great idea. you will get good compression points to make good power with mods later on.

If you dont wanna go that agressive w/ pistons p30's would be nice as well.

P30's would be about 10.5:1 CR
CTR's would be abour 11.9:1 CR

 

More like 12.25

 

with a completely stock b16 block crank and rods?

maybe im missing something like machine work? (milling/decking?)

 

thanks for the help

 

CTR domes are 8.63 cc

 

i realize that, run it on the zeal autowerks b series calculater and its 11.9:1, and it tends to be .2 high w/ the pct pistons.

 

What kinda compression will he see with a b16a head

 

i already did the search and plug ins. 11.9:1 if the head and block are stock and all internals are b16 (crank rods block).

thats on the hi side i like to think too.

 

It is 11.91 if you use the b16 head but he said he is using the gsr head which would put him at 12.25.

 

GOD i wish i could read a bit better. **** me sideways lol.
::

 

how can this be a "poormans" ctr when he's using a b16a block

 

The zeal calculator has been closer than the others when I have actually measured builds with CTR pistons. The C-speed numbers have always been too low with those slugs.

 

i realized where i messed up... i didnt read the gsr head part correctly... i was using a b16 head in the calculations. bone-head move