diffrence between b18 and b16 heads

[Terrano08]

what would make more power on a b20 b8 block ?? a stock b16 head or a b18c7??

[ninzee]

b18c7 head

[AXS]

what would make more power on a b20 b8 block ?? a stock b16 head or a b18c7??

b18c7 would produce max power, but a b16a head breaths better, im wondering if how the b16b heads would work, havent heard of anyone doing this setup but due to smaller engine capacity in the head, the free breathing and great power delivery of the b16b type r head would work wonders, all depends on what power range your looking for.

b18c7 head=max power gain for that setup
b16b head=revability and great torque figures mid range and still keeping a g-force filled vtec range

[GSi_PSi]

^ B18C7 , B16B, B16A are all the same PR3 head with slight modifications on the type-R heads ie
B18C7 = aggresive cams, mild portjob, better valve train
B16B = same as above with Slighty more aggressive cams then B18C7

Dude you made 3 topics for the same question.. its pretty obvious a type-R head will make more power?

[cymax]

^ B18C7 , B16B, B16A are all the same PR3 head with slight modifications on the type-R heads ie
B18C7 = aggresive cams, mild portjob, better valve train
B16B = same as above with Slighty more aggressive cams then B18C7

Dude you made 3 topics for the same question.. its pretty obvious a type-R head will make more power?


So is that the reason why people usually do B20/B16 swaps due to slightly more aggressive cams? Having said that, it'll lead to higher compression as well? Correct me if I'm wrong.... :)

[Terrano08]

well i have a vtir head on mine right now.. what would be cheaper?? to convert it to type r (cams, gears, valves etc) or to just sell it and get a c7 head??

[saikou27]

just get the cams

[GSi_PSi]

Cymax = cams dont affect your compression ratio,
the PR3 head are all the same, same volume ,.
People do B20 conversion because you gain 200cc more. Which leads to more torque and power.

And Chris just mod your VTiR head , much easier, get rid of that intake manifold to a single stage one

[Terrano08]

my brother has heaps of head at his shop so i was thinking just pick a type r one, prepare it and then just do the swap in a day or less and sell my old one ?? no ?

[cymax]

Cymax = cams dont affect your compression ratio,
the PR3 head are all the same, same volume ,.
People do B20 conversion because you gain 200cc more. Which leads to more torque and power.

And Chris just mod your VTiR head , much easier, get rid of that intake manifold to a single stage one

So it doesn't really matter if you use B16 or B18 head on a B20?

Thought that B16 head is a better combi than b18 since everyone is doing that. :P

[Terrano08]

So is that the reason why people usually do B20/B16 swaps due to slightly more aggressive cams? Having said that, it'll lead to higher compression as well? Correct me if I'm wrong.... :)

i think im with u on this one.. beacause ive heard if u want to do a b20 vtec turbo setup, u should go with b18 head and if u want to leave it n/a u should stick to b16...

i dont know why my head is b18.. my brother just made it that way for me

[hondar]

b18c vtir has a p72 head
b16a | b18c type r has a pr3 head

P72 head using "bufallo" intake manifold dual stage (a lot of people use skunk2 manifold to replicate the type r manifold without the need to change the head)
PR3 head using shorter intake manifold

the B20 block is used the give more 200cc ie more torque that is often lacking in honda engine of 1.6 or 1.8

PR3 head on a type r is port and polished by honda mechanic. they do about 100 only each day. (if i remember the figure)

type r valves are polished around the edge (for intake valves) to give better air flow

valve springs upgraded to withstand high rpm rev

cams duration is designed for high rev

LMA is upgraded.

Type r head has higher compression that being achieved with high compression piston compared to b16a

thats what i can remember from my rusty memory

[cymax]

^^^ *thumbs up*

[Limbo]

They use to port and polish by hand but now its done by machines to increase production, from my latest BMI update

[denrie]

yeh man get a dc2r head which is b18c7...

[string]

Cymax = cams dont affect your compression ratio,

They don't affect the static compression ratio, but they absolutely affect the dynamic compression ratio - which is the only relevent figure because it's how much the charge is actually compressed. Longer duration intake cams which hold the intake cam open longer past BDC will push the charge out the intake valve before any compression can take place, lowering the dynamic compression ratio (which to rectify, you raise the static compression ratio). Google "dynamic compression ratio" for plenty of articles on the subject.

Comapred to B16 cams or VTi-R cams, the Type-R is similar duration, but much greater lift, especially on the exhaust cam (which is why the Type-R head comes with dual exhaust valve-springs - for which a substitute exists; non-Type-R intake springs).