CivicVX94

i posted this in another thread to avoid making a new one for it but o well here it goes...

I've heard that D15b's have the same rods as a d16, so you could buy forged d16 rods and put them in correct? I<U> have only heard this from one person and DAMN he was determined it was correct, so i've been second guessing everything else I've heard...</U>

But i also heard a few times that D15b's and D15z1's have the same rods, both of which are 3mm longer that other D15's, the D16 length, but have a smaller bearing journal size than D16's and a larger one than D15's? So that would mean that you could not use D16 rods on a D15B...

I read this on one link
"the 1.5L bearings are 45mm size bearings and 1.6L are 55 mm's"
and this
"D15 bottoms are the same except for the HF using 41 mm bearings. The VX/D15B VTEC use 137 mm long rods, but the bearing size is all D15."
and
"3mm longer rods for the VX/D15b, and pin location is 3mm higher in the piston."

So can someone tell me whats true here?

If that is true, could you swap in any other D15 crank and then use forged D15 rods along with any forged piston? or would you encounter other problems, link the crank bearing? i already know that a D16 crank will not fit a D15 block.

this plays a huge part on whether I get a D15B or D16z6, any help will be greatly appreciated. Thanks.
O and for the record, yes I did search, I have searched quite a bit now and in the past. Believe me, I have done my fair share of reading about the D16z6, D15B, and D15z1. I would like to think i know these engines relatively well.
Thanks in advance.

CivicVX94

bump for the night

Revolver

Bump

CivicVX94

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

Good man, let's keep the bumps coming till we find this out!

sohc_boy

i was under the impression that the d15b was basically just a 1.5 bottom with a z6 head with a more aggressive cam. ask eg6ajk he's had the d15b and knows it well.

CivicVX94

will do

CivicVX94

bump it up

CivicVX94

bump

CivicVX94

bump for the night

civtegra_hybrid

don't use the D16 rod, just use the B18A rod's they will fit your just have to resize the hole to fit, any machine shop can do it, and they will handle up to 300 hp check it out,

slywfbpsi

the d15b vtec has a 137mm rod length and a 45mm rod bearing size. just because it seats the pin location 3mm higher in the piston does not mean you cannot use d16z6 pistons.

CivicVX94

dude you just proved yourself wrong, it has a 45mm bearing like all D15's and all D16's have a 55mm bearing.
So no you cannot use a D16 rod on a D15B or D15z1.
I've done alot of searching and this is the conclusion i've drawn.

o and i wasn't talking about pistons
you can use the pistons but not the rods

slywfbpsi

How did I prove myself wrong. maybe you need to search some more. it's not a d16 so it doesn't have a 55mm bearing size it's a d15. the d15b vtec and the d15z1 all have have a 137mm rod length (like a d16) but have the smaller rod bearing size 45mm (like the d15's they already are, you have to get custom rod's made. However, crower and pauter already have the spec for that motor.

CivicVX94

yeah all that was in my first post, I later on found out what was true. Someone had said the D15B had 55mm bearings, so i second guessed myself but it doesn't.

What I did not know was crower and pauter had rods out tho, thanks for that.

And when I replied to your first post, I was thinking you were talking about the rods cause I was skimming (like always) but I never mentioned the D16z6 pistons so that kinda lost me....
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slywfbpsi &raquo;</TD></TR><TR><TD CLASS="quote">does not mean you cannot use d16z6 pistons.</TD></TR></TABLE>
One more question tho, why couldn't you use forged D15 rods along with a forged piston in the D15B? I could see why you would have to use the one's specifically for the D15B if you were using the stock pistons but if you're using aftermarket forged pistons, why can't you use any other forged D15 rods?thanks

CivicVX94

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civtegra_hybrid &raquo;</TD></TR><TR><TD CLASS="quote">don't use the D16 rod, just use the B18A rod's they will fit your just have to resize the hole to fit, any machine shop can do it, and they will handle up to 300 hp check it out,</TD></TR></TABLE>
I'm not 100% sure on this but I did not know a B18A existed. If you're talking about the LS, B18B, I think those will only fit on a D16, and cause D15's and D16's have different bearing sizes I doubt it wil fit a D15. And I really don't see how a shop can making a rod bearing smaller so it can fit...I could be wrong tho.
Plus I'm boosting, i'm going to do a full rebuild and boost 10psi daily, so I want forged rods to stay safe, but thanks tho

CivicVX94

my bad there is a B18a well B18A1, it is a USDM engine and came in 90-93 Integra GS/RS/LS models

slywfbpsi

you can't use forged d15 rods, because they wouldn't fit in the d15b vtec. the d15b vtec has rods the same length as d16s, so how would d15 rods fit? also, since the d15b pistons is the same as a d16z6's except with the pin location changed is also the reason why you would not use 15 pistons for the engine build.

Slammd Sol

bump

CivicVX94

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slywfbpsi &raquo;</TD></TR><TR><TD CLASS="quote">you can't use forged d15 rods, because they wouldn't fit in the d15b vtec.the d15b vtec has rods the same length as d16s, so how would d15 rods fit?</TD></TR></TABLE>
How would they not not fit? I know that they have the same length rod as a 1.6L,but the bearing size is the same as any other 1.5L, 45mm. and the piston pin location is just 3mm higher,so the overall rod-piston length is the same as any other D15. What you're saying doesn't prove anything.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slywfbpsi &raquo;</TD></TR><TR><TD CLASS="quote">also, since the d15b pistons is the same as a d16z6's except with the pin location changed is also the reason why you would not use 15 pistons for the engine build.</TD></TR></TABLE>
Yeah and that doesn't make much sense either, any other D15 and D16 piston should physically fit, but you'll smack the **** out of your valves because the pin location is 3mm lower than the D15B's, but that is only with the D15B's rods. If you were to use D15 rods (not D15B's, but any D15's) and any other piston, I don't see any reason to believe it would not fit.
Also I'm not sure what that last part was attempting to say so I just debated it as best as I could

CivicVX94

Ok here's I'll try my best to explain this....
-The D15B has 137mm long rods.
-Every other D15 have 134mm long rods.
-Both have 45mm bearing journals

<U>BUT</U> The D15B's pin location is 3mm higher in the piston than other D15's.
Therefore, the overall piston to rod length is the same (not including any dome) just in general with dished piston's.
If you're following what i'm saying, I don't see why a D15's (for ****'s and giggles, let's go with the D15b7) rods and pistons won't fit in a D15B block, there is no reason.
I mean, the block heights are identical, the rod to piston length is the same, and the bearing journal is the same......

And as far as a D16, well ALL D16's (to my knowledge) have 55mm journal bearings, along with rods which are 137mm.
So even tho the rod lengths are the same, they cannot fit because of the journal bearings.
But a D16's pistons should fit in a D15B using (...let's go with D15B7 again) rods, but <U>NOT</U> the stock D15B rods

Now, there is no more to debate really...I personally think this thread should be locked lol

Slammd Sol

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CivicVX94 &raquo;</TD></TR><TR><TD CLASS="quote">
But a D16's pistons should fit in a D15B using (...let's go with D15B7 again) rods, but <U>NOT</U> the stock D15B rods

Now, there is no more to debate really...I personally think this thread should be locked lol</TD></TR></TABLE>

So then how about this: LS rods (been known to work in D16s?) with any set of D16z6 pistons (perhaps Suzuki Vitara's?) in a D15b.

CivicVX94

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

So then how about this: LS rods (been known to work in D16s?) with any set of D16z6 pistons (perhaps Suzuki Vitara's?) in a D15b.</TD></TR></TABLE>
I would say no.
Reason being, if they fit a D16 then they have 55mm bearing journals.
But a D16 with LS rods and vitara pistons is a good set up for boost.
But the compression is low, i think mid 8's but i'm not sure. Also you have to get the block notched for LS rods to fit.

Slammd Sol

Is bearing Journals the peice that goes around the crankshaft? Also what do you think about putting a D16z6 crank in a D15b?

CivicVX94

yep you are correct.
No a D16 crank will not fit into a D15 block. I think it is because of the crankshaft main bearing (???) I'm not sure if that is why,but I do know that it doesn't fit.
However a D17 crank will fit in a D16 block with a D17 oil pump I believe.