Would DC2R head be good with 11.9 compression?

[BlitZ]

Would DC2R valve train (complete head) be good with 11.9 compression?

Produce much more/if any power?

[tinkerbell]

yes.

[chuck]

It should produce more power but there is more to building an engine than just upping compression... can you give us more details?

[tinkerbell]

i also dont quite understand the question chuck???

[chuck]

To rephrase, what block is this going onto, how is the compression being raised? Is it just a piston swap in a B18c7? Is there an aftermarket ecu? Are you checking for clearances? What headgasket are you using? etc.

[BlitZ]

block is a 1.8lt block
(for example b18c7 rebuilt with PCT)


everythign is STD (including head gasket)...



but tuned with aftermarket ECU.. which is a given

[tinkerbell]

so what is the aternative head you are comparing it to?

[BlitZ]

so what is the aternative head you are comparing it to?

I am planning to rebuild a b18c7...
would rebuilding using PCT piston net more power than STD... 11.9 over 11.1cr..


This has got me thinking..
but also would my engine capacity in terms of ltrs drop?

[tinkerbell]

no by much...

[freakie]

Blitz I asked my tuner the same question, he said the compression will definately yield more power, but the Camshaft profile re: lift and duration is much more important.

dont ask me what all that means :P

[tofuR]

I believe that compression is in the field of modification of ..
"free power.."

but u can get too greedy with compression and cop detonation, and have clearance issues..

but it all depends on how u r planning to get that compression up..
are you going for higher domed pistons ?
or are you milling the head in combination with a thinner headgasket?
it all makes a difference ..

but i think that 11.9/12 will be pretty good with stock itr cams/head..
if you go any more you may need more lift/duration in the cams ..
i mean its not a bad thing.. but u will gain even more if u get bigger cams ..

[tofuR]

i think in a similar comparison ..
u know how i told u im running interim vtir cams in my itr head ..
until i get my set ..

pretty much stock compression .. maybe a little higher..
im actually getting very poor fuel economy when i hit it .. cos the cams aren't lifting enough.. although power feels as good as when i had the stock head with itr cams ..

[tinkerbell]

if you read the post - he is using "PCT pistons" = B16B pistons...

all he will need to do is check for piston to valve clearance...

[chuck]

I have no direct hands on experience, but B16B pistons do seem a frequent upgrade for B18c5 owners in the US on h-t.com, with decent results. Seems a fairly cheap and safe way to up compression, if you listen to tinkerbell and check for piston to valve clearance.

[tofuR]

ahhh icic i had no idea what PCT was ..

i thought that ctr pistons netted quite a bit more than 11.9 though
i was thinking in the vicinity of 12.5