Inisharu D

i'm just wondering if i'm going to turbo my '03 civic HX, does it make too much of a difference performance-wise if i turbo a DOHC or an SOHC?
by the way, my engine is a D17A (i think)

i just want to know the performance difference between SOHC and DOHC and the potential of a K20A compared to D17A. please be specific. thx!

Chip

K20 vs. D-series, they arn't even in the same league.

S9i1R

I'd say change your cam and get hondata or uberdata, it could be competitive against a Bseries.

DaZman69

simple question simple answer, cost.
For the dollar, you can't beat d series performance. There are people out there making over 400whp on stock sleeves in a D, without spending a whole lot of money, even though the b's are clearly better motors, whats the point? to say you have a b? if your going all motor, then no questions asked, B. if your going turbo, i'd say d.

RyanEJ8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaZman69 &raquo;</TD></TR><TR><TD CLASS="quote">simple question simple answer, cost.
For the dollar, you can't beat d series performance. There are people out there making over 400whp on stock sleeves in a D, without spending a whole lot of money, even though the b's are clearly better motors, whats the point? to say you have a b? if your going all motor, then no questions asked, B. if your going turbo, i'd say d.</TD></TR></TABLE>

Exactly. A turbo that flows 350cfm, for example, will flow 350cfm whether it's on a SOHC or DOHC. Therefore the SOHC will have the same power potential with the same turbo. You might reach the limits of what a SOHC head can flow alot sooner, but the fact that 600whp has already been done on a SOHC, means hardly anyone will reach it's full potential and actually NEED to swap to a B or K Series.

D17 is a different story though. The engine is relatively new and not much has been done with it as of yet, but who knows what the future for it holds.

MooreBoost

The fact that SOHCs are disposable is also handy, especially if your new to boost.

1boostedcivic

turboing the new sohc's are very expensive man

M.A.R.C.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1zexxedcivic &raquo;</TD></TR><TR><TD CLASS="quote">turboing the new sohc's are very expensive man</TD></TR></TABLE>

yah and not as straightforward as the older d16's... or at least so it seems

ATS*Mark

i laugh at B and K series motors bahaahahahahahaha

M.A.R.C.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OnePointSicks &raquo;</TD></TR><TR><TD CLASS="quote">i laugh at B and K series motors bahaahahahahahaha</TD></TR></TABLE>

oh yah sucka... we'll see about that!

1boostedcivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by M.A.R.C. &raquo;</TD></TR><TR><TD CLASS="quote">

oh yah sucka... we'll see about that!</TD></TR></TABLE>

lol

JRciv

Go with a D-series. You can overboost those suckers and blow them up then buy replacements on ebay for $400.


By the way, why is the DOHC better? Same number of valves on the SOHC and DOHC right? Is it just that it has a better flowing head?

M.A.R.C.

i say it all depends on goals. coming from someone who's boosted on a stock d16, a fully built d16, and heading for a built gsr turbo or a stock ls turbo.

the stock d16 did 194whp @ 8psi on a 60 trim T3... was fun. i cranked it up to 10psi and it was just awesome.

never dynoed or tracked the built on but it felt up around 300whp @ 14psi... i will never know

the b... well if it's a stock ls... 300whp or bust. if it's the built gsr... 400 or bust.

if ur goals are 200-230whp with little investment, and cheap insurance (cheap *** longblocks). go D.

if ur goals are 250-300whp with a little more investment, and a lil more costly insurance (ls longblocks are relatively cheap too). go LS. or GSR if ur a baller

if ur nutso and want totally unusable street power... build a b and don't put an lsd in it or good tires.

RyanEJ8

Marc is that you? As in CivicRyda?

Changed your name, huh?

M.A.R.C.

yah... i'm the tuner formely known as....

ATS*Mark

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by M.A.R.C. &raquo;</TD></TR><TR><TD CLASS="quote">oh yah sucka... we'll see about that!</TD></TR></TABLE>


oh its marc you fuckball you changed your name too!!!!!!!!!!!!!!!!!!

my gt35e is going to **** on every k and b series turbo ever built.

M.A.R.C.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OnePointSicks &raquo;</TD></TR><TR><TD CLASS="quote">


oh its marc you fuckball you changed your name too!!!!!!!!!!!!!!!!!!

my gt35e is going to **** on every k and b series turbo ever built.</TD></TR></TABLE>

Inisharu D

so far, still no one answered my question about DOHC and SOHC

CivicSiRracer69

1.6T &gt;dohc

M.A.R.C.

k20a has a lot more potential than a d17.

but depending on your goals.. u may not need all that potential

ATS*Mark

if your goal is only 250-300 , go K , if its like 800 or 1000 , D series biatch!!!!!!!!!!!!!!!!!!!!!!!!!

Inisharu D

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OnePointSicks &raquo;</TD></TR><TR><TD CLASS="quote">if your goal is only 250-300 , go K , if its like 800 or 1000 , D series biatch!!!!!!!!!!!!!!!!!!!!!!!!!</TD></TR></TABLE>

so you're saying D series has more potential for boost than a K series?

and since no one is really answering my question about dohc and sohc, i'll be more specific with my question:
i'd like to know if exhaust can get pushed out by a turbo during the time when the valve timing overlaps.

M.A.R.C.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Inisharu D &raquo;</TD></TR><TR><TD CLASS="quote">

so you're saying D series has more potential for boost than a K series?

and since no one is really answering my question about dohc and sohc, i'll be more specific with my question:
i'd like to know if exhaust can get pushed out by a turbo during the time when the valve timing overlaps.</TD></TR></TABLE>

i'm pretty sure he was just joking about that. and to the dohc vs sohc thing. many people have turboed k20's before... i'm sure that isn't an issue and if it was tuning have would taken care of it. so yes... the k20 has more potential. hands down.

raene

You can get different valve angles on the DOHCs than you can on the SOHCs. SOHCs are limited to rockers stretching from the single cam to the valve tappets, while DOHCs can run much smaller rockers and more extreme angles. The rocker has further to reach on the SOHC so they're longer and heavier. Plus SOHC VTEC is only on the intake side, whereas DOHC has VTEC on both intake and exhaust.

RyanEJ8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by raene &raquo;</TD></TR><TR><TD CLASS="quote">You can get different valve angles on the DOHCs than you can on the SOHCs. SOHCs are limited to rockers stretching from the single cam to the valve tappets, while DOHCs can run much smaller rockers and more extreme angles. The rocker has further to reach on the SOHC so they're longer and heavier. Plus SOHC VTEC is only on the intake side, whereas DOHC has VTEC on both intake and exhaust.</TD></TR></TABLE>

I disagree. One thing I have learned from Bisimoto is that the valve angles of the SOHC are superior and allow for a more radical lift camshaft design without the valvehead collision factor of the DOHCs. If you notice, even from factory the SOHC VTEC have higher lift than the DOHC VTEC. Example: D16Y8 mid lobe intake 38.274mm, exhaust 38.008mm compared to the B16A2 mid lobe intake 36.267mm, mid lobe exhaust 35.720mm.