What is the difference?

[Honda-Fanatic]

Hello,

I already have read that the B2 and the B7 blocks are almost identical.
I've understand that the block, cylinder deck and heads are the same,
but the B2 makes 90HP and the B7 102 HP. What makes the difference, is it just that the B7 has MPFI, of is the cam also different in the B7?

Greetings Honda-Fanatic

[DOG]

I believe its because of the mpfi vs.dpfi. intake manifold design. More fuel running through 4 injectors instead of 2. Better design of the intake manifolds on mpfi allow for better air flow. Just my opinion.

[Honda-Fanatic]

Basically the B2 and the B7 engine's are fully identical execpt for the intake? There is no difference in cam/exhaust manifold that causes more/less HP? So if i put the intake manifold, ECU etc from a D15B7 on my car HP wil raise to 120HP? is this correct?

Greeting Honda-Fanatic

[DOG]

Yes, except for the intake manifold they are virtually the same engine. Like I said cam is possibly different but I have had no confirmation other than a few passing comments from people. The exhaust manifolds are the same. You wont get 120hp out of it unless you upgrade the cam to an si (D16a6) or an aftermarket cam. You might want to upgrade the valvetrain if you plan on revving past stock rev limits. Get a decent header from a z6 or y8 engine if your on a budget or get a good aftermarket header like HP Racing or DC.

[Honda-Fanatic]

Basically the B2 and the B7 engine's are fully identical execpt for the intake? There is no difference in cam/exhaust manifold that causes more/less HP? So if i put the intake manifold, ECU etc from a D15B7 on my car HP wil raise to 120HP? is this correct?

Greeting Honda-Fanatic

Sorry, i made a mistake, the 120HP must be 102HP :shock: :lol:
What i meant was : When i convert my D15B2 engine to MPFI with the stuff from a B7 engine, and i leave the rest of the engine stock, will i get 102HP like the stock D15B7 engine?

Other Question, if i want to rev to about 7000rpm, and i put the rev limiter at 7500rpm, do i need to modify my valvetrain of valve springs? The stock red-line starts at 6500rpm, and the stock rev-limiter is at 7000 rpm.

Greetings Honda-Fanatic

[transzex]

imagine this...........

take your 90 hp 4g DX motor, changeover the D16A6 MPFI including the intake manifold.

That combo is the SAME THING as the D15B7 @ 102 hp stock rating.

The D15B7 and D16A6 have the same runners/plenum, just different mounting for the TB and sensors.

[Honda-Fanatic]

imagine this...........

take your 90 hp 4g DX motor, changeover the D16A6 MPFI including the intake manifold.

That combo is the SAME THING as the D15B7 @ 102 hp stock rating.

The D15B7 and D16A6 have the same runners/plenum, just different mounting for the TB and sensors.

Ik know when i convert my D15B2 to an MPFI with the stuff of an D15B7 or an D16A6 the combo is the same as the D15B7, but are the cams the same? Can someone give me an answer to that question, i know that the A6 has a little more aggressive cam but what about the cams of the B2 and the B7? The same?

Greetings Honda-Fanatic

[Honda-Fanatic]

nobody that knows if there is any difference in the stock B2 and B7 cams or has the specs of the B2 and the B7 cam??

I'd like to know if the difference in HP (90 vs 102) comes from the MPFI system, the B7 cam, or a combo of MPFI and the B7 cam..???

Greetings Honda-Fanatic[/b]

[S Q A D]

well .. why dont you just get the a6 cam .. and call it a day ...

[Honda-Fanatic]

I also know that the A6 cam gives the engine more power then my stock cam, but what i want to know :

Is it the MPFI of the D15B7 that gives the B7 12HP more then the B2
Is it the cam of the D15B7 that gives the B7 12HP more then the B2
Or is the 12HP difference a combination of MPFI and B7 Cam???

And wich gain in HP can i aspect if i use a A6 Cam in my D15B2, does that make much difference?

Greetings Honda-Fanatic

[Bizzar]

Even if you convert it it will still be a pretty sad engine N/A. Trust me I have one. Just do a mini mi lol. Swap on a Z6 head and THEN call it a day. BTw those "rated" hp numbers arent even close to what you really have at the wheels. Try more like 75-80 whp.

[transzex]

cams are near the same, all power is from the intake/FI swap.


"rated" hp numbers arent even close to what you really have at the wheels. Try more like 75-80 whp.

Yessir, 102 hp "RATED" motor should lay down 92hp/90-95 lb/ft at the dyno rollers.........

117.7hp and 103.2tq, must have did something right/wrong!!!!!!!!

http://www.bettendorf.com/~mrbone/pictures/RR/DynoCam.jpg

[Honda-Fanatic]

cams are near the same, all power is from the intake/FI swap.


Thanks transzex !!! (And also all the others that have taken the time to answer to my question) That's the thing i really wanted to know :D 8) , so in my opinion the MPFI swap makes a good power gain for what it costs, and a good basic setup for futere mods :D

"rated" hp numbers arent even close to what you really have at the wheels. Try more like 75-80 whp.

Yes i know that my 90HP rated stock engine doesn't put 90HP to the wheels, but that was not the question, i just wanted to know what causes the difference in the HP numbers between the B2 and the B7 engine, and like i said, i know that HP numbers are FWHP numbers.

Even if you convert it it will still be a pretty sad engine N/A. Trust me I have one. Just do a mini mi lol. Swap on a Z6 head and THEN call it a day. BTw those "rated" hp numbers arent even close to what you really have at the wheels. Try more like 75-80 whp.

Why is the B2 a sad engine? Just because its making less power then a D16A6 or a Vtec SOHC engine? I don't think that is a good argument, i ask you to give me a very good argument why it is a sad engine. I think that it is basically a good engine, not a verry fast engine but a good reliable engine with a good gas mileage. Besides you don't know what my goal is. I just want to keep the original B2 engine and give it some more power, it is nog my goal to build a fast hatch on the quarter mile. I just want some more power out of the stock engine :D

Greetings Honda-Fanatic

[transzex]

the B2 suffers from a shitty intake and DPFI injector setup.

140-145 hp is easy without ever pulling the head off.

[Honda-Fanatic]

Even if you convert it it will still be a pretty sad engine N/A. Trust me I have one. Just do a mini mi lol. Swap on a Z6 head and THEN call it a day. BTw those "rated" hp numbers arent even close to what you really have at the wheels. Try more like 75-80 whp.

the B2 suffers from a shitty intake and DPFI injector setup.

You are right at that point transzex, but Bizzar was talking about a B2 that has been converted to MPFI, so then the point that it suffers from a shitty intake an DPFI injector Setup is already has been taken care of.

I asked Bizzar to give an argument why it is a pretty sad engine, even after a descent MPFI setup.

Greetings Honda-Fanatic

[transzex]

sad motor???????

My son's D15B2 swapped 91 STD HB swap walked a 93-95 Del Sol Si with me driving.

90 hp vs 125 hp, but I am the better driver.

[Honda-Fanatic]

I think that a D15B2 is a good engine after a MPFI swap, but bizzar said that it still is a sad engine N/A even after a Decent MPFI setup, so i asked him to give an good argument why it should be an sad engine even after a MPFI setup.

Greetings Honda-Fanatic