I am purchasing a D15B2 to replace the aging POS that I have in my ride right now, and I was wondering if anybody has attempted to stroke out the D15 and possibly add better springs and valves to their base motor? I don't want a super beast, but I do want more torque and better upper RPM range response from a stock appearing motor.

Does anybody know who might carry products that would help along this line of thought, or has anybody successfully stroked out an EF/ED stock D15 for not much money?

 

D16 engines are stroked D15s. Thats what gives it the difference in displacement.

If you are looking to stay inexpensive get an A6 crank.

Stroker kits are hella expensive. And I dont know any specs on the D17 motor, if its a stroked or bored d16 or what not.

If anything, this is a free bump.

 

So, if I get the A6 crank, what rods and pistons would I need for direct replacement? A6 rods and pistons???

BTW... Thanks for the bump!

 

The B2 and A6 have the exact same bores. So the pistons are the same size. As far as compression ratios for the pistons, I don't know which one will yield a higher compression. And obviously higher compression = more power.
I also have no idea which set of pistons are stronger, more than likely they are about the same strength.

Rods, I would use the A6 rods.

You could also get a Y8 headgasket.

 

what about the main bearings on the 1.5 and 1.6? i take it if you are giving this info out, you know for certain that they are the same and would allow for the use of the 1.6 crank in the 1.5 block? im sure that if the cranks were that easily interchangeable it would be more heard of doing so. enlighten us with your knowledge...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ryan89crx &raquo;</TD></TR><TR><TD CLASS="quote">what about the main bearings on the 1.5 and 1.6? i take it if you are giving this info out, you know for certain that they are the same and would allow for the use of the 1.6 crank in the 1.5 block? im sure that if the cranks were that easily interchangeable it would be more heard of doing so. enlighten us with your knowledge...</TD></TR></TABLE>

Actually, I have heard from numerous sources that D16 mains are larger than D15 mains. So it would appear that you could not stroke a D15 in this manner. But given the low cost of any kind of D16, why would you want to even consider stroking a D15? Even if you could swap cranks, rods, etc, it would be MUCH more cost effective to just swap in a D16. Even the gasket set could end up costing you more than a complete D16. Simply put, stroking is not cost effective. This is why nobody does it.

 

nope you cant swap A6 cranks into the 1.5L's the MAin journals are smaller on the 1.5L.

Why would you want to swap it in anyway???
If you did you have nothing more than a A6 nothing more nothing less. period.

It would save you time to just buy a A6, and put the d17 rods and crank in like I have......but my D17 internals are in a DOHC ZC.

 

Well I was wrong. I learn something knew everyday.

I was right about something atleast... the difference in the d15 and d16 is that the d16 has a longer stroke.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mach69 &raquo;</TD></TR><TR><TD CLASS="quote">Well I was wrong. I learn something knew everyday.

I was right about something atleast... the difference in the d15 and d16 is that the d16 has a longer stroke.</TD></TR></TABLE>

yep

 

The point is I have a D15B2, and I do not have anything else. I can not justify to my wife or myself to trash that and just buy another one. I would love to improve the performance of the 1.5 and just make it the perfect daily driven motor. If this is not possible, I of course will accept that fact and just rebuild it as is and do a direct swap to get my hatch back to factory spec.

 

You could rebiuld it but while you at it find some(I think) 88-89 integra pistons (or is it the dohc zc ones) and they'll raise your compression a bit along with the proper machining for the A6 crank and I think it would make a good daily driver. Some of the experts will chime in on this, I know.

 

Thank you for that info, I can't wait 'til the experts weigh in on this one!

 

Does anybody else have an idea how I might be able to massage a little more juice out of my base powerplant without getting rediculous? Keep in mind I do NOT want to buy a new block of any type, I already have an extremely low mileage block sitting in my living room ready for some TLC.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VegasEFHB &raquo;</TD></TR><TR><TD CLASS="quote">Does anybody else have an idea how I might be able to massage a little more juice out of my base powerplant without getting rediculous? Keep in mind I do NOT want to buy a new block of any type, I already have an extremely low mileage block sitting in my living room ready for some TLC.</TD></TR></TABLE>mpfi swap, a6 IM/TB, a6 or sohc non vtec zc cam, pm6 ecu, and si tranny would probably keep you satisfied for a while

 

I have a line on a DX 5-spd, so that can be converted to Si spec pretty easy. MPFI might be a possibility, but only if I can get that done on the weekend because I use my little hatch as my daily driver (I am unfamiliar with wiring diagrams nor have I ever attempted anything electronic in a car). The cam was already in the works, and I want to increase the strength of the springs to gain some higher end reliability. As far as the ECU... that might be along the lines of the MPFI conversion. I have never done that, so I do not know if this is possible, at least at my kitchen table .

Thank you for the suggestions and I am making a list of your ideas!

Anybody else?