Slammd Sol

Are the rods in the jdm sohc vtec D15 (130ps) the same rods that are in the d16z6? If not are they at least as strong? Im looking to boost 10-14 psi, but I dont want to on flimsy DX d15 rods..

Slammd Sol

t t t... Anyone?

BauleyCivic

the D16Z6 and D15B rods are both 137mm, but the stroke is less on the D15B so i'd assume that they wouldnt work in a Z6. I know the VX rods are the same size as the D15B...the 137mm VX/D15B rods are used to put d16 pistons into D15's.

So, to answer your question...as far as I know, no.

Slammd Sol

I am not looking to see if they will fit each other.. I am just trying to figure out if the jdm vtec d15 can take boost like the d16z6 can.. The main weak point with the USDM d15 is that the rods are thinner/weaker..

Slammd Sol

bumpy....?

HumanResource

Don't interchange
The Big end is still D15 spec (smaller)

Slammd Sol

I am <U>Not</U> looking to Interchange Rods! I am simply trying to figure out if rods in the JDM vtec D15 are as strong as the rods in the D16z6.

egmike

There is a guy on the board here who made 200~ whp on his d15b vtec so pretty sure they gotta be close to d16z6 for strength

https://honda-tech.com/zerothread?id=420823

chad

don't waste your money on a dseries!

huntarrr

don't waste your time on gay posts!

BauleyCivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97redex &raquo;</TD></TR><TR><TD CLASS="quote">don't waste your time on gay posts!</TD></TR></TABLE>

HAHA Owned!

Long live the D

Jim Truett

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HumanResource &raquo;</TD></TR><TR><TD CLASS="quote">Don't interchange
The Big end is still D15 spec (smaller)
</TD></TR></TABLE>

Not true on the JDM D15B. The D15B rods have the same size big end as the D16Z6. 1.7707 inches I believe. The main journal diameter is smaller, however. It is 1.7707" also. The D16Z6 has 2.1644'' main journals. The USDM D15 connecting rod has a 1.6526" big end diameter.

BauleyCivic

So, Jim Truett, you can put USDM D16 pistons into a USDM D15 with the JDM D15B rods?

Jim Truett

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BauleyCivic &raquo;</TD></TR><TR><TD CLASS="quote">So, Jim Truett, you can put USDM D16 pistons into a USDM D15 with the JDM D15B rods?</TD></TR></TABLE>

I wish I had an answer for you. Unfortunately I did not measure the rod length when I built my D15B. It would not surprise me if the rods are the same as the Z6. Unfortunately I do not have any of the rod length specs in my manuals.

BauleyCivic

http://www.knology.net/~jediklc/D.htm

According to that site:

D16A1,A6,Z6,Y5,Y7,Y8 90mm 137mm
D15B1,B2,B8,B7 84.5mm 134mm
D15Z1 84.5mm 137mm

The D15Z1 and D16's have the same rod length, but the Z1 has the shorter stroke, shared with the USDM D15B's

Jim Truett

I think the D15B uses PM3 pistons. I will try to get a borescope and look through a sparkplug hole and confirm this. I know that I needed D15B7 piston rings to assemble the JDM D15B pistons, and the B7 pistons are PM3.

tgreaves

Im trying to find stronger d15 rods for boost also.. Ill do some looking into this and get back..

UnKnOwNsLeEpEr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">don't waste your money on a dseries!</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97redex &raquo;</TD></TR><TR><TD CLASS="quote">don't waste your time on gay posts!</TD></TR></TABLE>

lol

fsufan814

let me try to set the record straight as me and others have put in the leg work on this one

(note these measurements are including with bearings as a helms would specify big end size with bearings)
usdm d15s have 134mm length rod and a 42mm big end
usdm d15s have a stroke of 84.5mm giving you a r/s ratio of 1.58

the usdm d16s are 137mm length rod with a 45 mm big end
usdm d16s have a stroke of 90mm giving you a r/s ratio of 1.52

and the JDM D15BVTEC has a 137mm lenth rod with a 45mm big end
the JDM D15BVTEC has a 84.5mm crank, giving a r/s ratio of 1.62

the VX motor has a 137mm length rod with a 42mm big end
and the VX has a 84.5mm crank giving a r/s ratio of 1.62 also

this is how vx rods are used in USDM 1.5's to interchange d16 pistons aroudn in d15s, but vx crank is NOT the same as the JDM d15bvtec

so in laying out all these specs for you guys, i will say yes i do believe that d16 rods will work just fine in a D15Bvtec and to be very honest i have a distinct feeling and pretty much have the evidence to prove that they are almost just like a d16 rods if not the same

and the pistons in a d15bvtec are p08s they have just a slight dish

heres some pictures to chew on

also the d15bvtec has a slightly bigger cam than the d16z6



this is d15bvtec rods versus d15b7 rods



this is a vx rods big end 42mm when bearings are inserted (note in this picture there is no bearing)



now here are jdm d15bvtec pictures

this is the piston code note it says p08



this is the rod ends comparison of a d15b7 and d15bvtec

d15b7 big end


this is the d15bvtec big end


i hope that this helps

No More "ASSUMING" needed heres the facts





Modified by fsufan814 at 7:51 PM 1/11/2005

fsufan814

bump to the top so it can be discussed

Soccerking3000

dude the cam lobe width has absolutely NOTHING to do with performace or anything, its only the lift and duration, get those specs to compare not the width it is irrelavent

Tad

thanks for the clarification man!!
hopefully ppl won't have to wonder anymore about this.
good post.

what kinda pistons do d16z6's have?

also it would be nice to see a pic comparo of the z6 rods vs d15bvtec,
so we can see if the "spiffy 1.6" gets tougher rods along with its added displacement(i doubt it though, heh).

Tad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">dude the cam lobe width has absolutely NOTHING to do with performace or anything, its only the lift and duration, get those specs to compare not the width it is irrelavent</TD></TR></TABLE>

it's a known fact that the d15b vtec has a more aggresive cam than the z6.
it's been dyno proven.

I forget who it was, but someone did some dyno tests of the d15b vtec cam version
the lower end zex cam(stage 1 i think) and saw practically no gains.
I think it was like a very tiny ammount for a short period through the powerband,
whereas the d15b cam actually made more power throughout the powerband.

so it's like this zex cam&gt; z6 cam, so d15b vtec cam&gt; z6 cam

Soccerking3000

i know that but he is comparing the lobe width which doesnt affect performance, he is basing gains and so forth on the wrong measurements

Tad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">i know that but he is comparing the lobe width which doesnt affect performance, he is basing gains and so forth on the wrong measurements</TD></TR></TABLE>
i getcha,
bet well, its better than no pic at all I suppose.