Finally, the TRUTH regarding K-Series vs. B-Series engine weights!

[locash]

As I was removing the B20VTEC from my 99 Integra to install a JDM K20A with the new Hasport EG/DC K-Series mount kit (shameless plug), it dawned on me that I still had not seen any real numbers regarding the weight differences of these things. I dug out my trusty Longacre corner balance scales, zero'd them out, and tossed the motors on em. I made sure to take pictures of the scale readings, name them, save them to the pc, and clear out the camera before I did the 2nd motor. I also tried to keep the motors as similiar as possible, neither had an exhaust manifold of any kind, or an A/C compressor. The B-Series motor DID have a power steering pump, and the A/C torque mount, so factor in 5 lbs or so on top of the numbers below.. B-Series engine/trans: 401 pounds K-Series engine/trans: 403 pounds In conclusion, these are surprising numbers, I figured (like most I bet) that the K-Series motor would be lighter. I'll weigh a few more B and K series swaps in the coming weeks and see what else I find. [img]http://www.****canada.com/engine-weights/B20VTEC/b20vtec-scale1.JPG[/img] [img]http://www.****canada.com/engine-weights/B20VTEC/b20vtec-scale3.JPG[/img] [img]http://www.****canada.com/engine-weights/k20a/k20a-scale1.JPG[/img] [img]http://www.****canada.com/engine-weights/k20a/k20a-scale4.JPG[/img]

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[N1NjA TuRtLE]

whoa, and most claimed the b-series was heavier.

[Used2beAb16]

#1, what kind of internals were in the b20/vtec? Were they oem parts or lightweight probe rods and strutted pistons.?? It seems the motors are close and could be even closer if the b20 had lighter internals.

I didn't get to look at the pics is this the tranny and flywheels too or just the motors? judging by the weights im guessing thats trannies too, did the b20 vtec have a stock flywheel? or aftermarket? I am assuming all the parts on the k20 are OEM.

[Used2beAb16]

btw did i mention that your my hero. I wish i had a k

[justBLZE]

Good info.

Lot of posts on here claim the K-series being lighter.

Originally Posted by locash

The B-Series motor DID have a power steering pump, and the A/C torque mount, so factor in 5 lbs or so on top of the numbers below..

Wouldn't you subtract rather than adding on TOP of the numbers?

[JDM2ndGen]

wow ...im surprised that they are that close ...

[aznsmtboy]

why would the k series motors be lighter? isn't everything a bit bigger in the K series, seeing that it's bigger displacement?...oh shit, nm you weighed a B20...oops

[DefiantGSR]

Originally Posted by aznsmtboy

why would the k series motors be lighter? isn't everything a bit bigger in the K series, seeing that it's bigger displacement?...oh shit, nm you weighed a B20...oops

no, the blocks of the b18 and b20 are the same...just the cylinder is bored out a little more. in fact, that means a b20 should be lighter. but that weight is minimal.

[aznsmtboy]

ahh..okay.. but what speculates people in thinking the kseries is lighter?

[Turbo R]

off topic question.

Is the K series motor more difficult to learn and deal with than the B series motors.

I bought my ITR not knowing anything about this motor and how to work on it. no clue. I did all my learning just by grabbing a wrench and hackin. Everything then became self explanitory.

Is the K series similar to the B-series in regards to changing a clutch or disconnecting the harness or taking the complete motor out.

Is the K series a pain in the ass to work with?

[DOHCtorTHRUST]

Originally Posted by aznsmtboy

ahh..okay.. but what speculates people in thinking the kseries is lighter?

i believe honda quoted that it would be lighter, or was it SCC(it might be one of the other majoy mags)? this was a long time ago, back when the RSX was introduced.

i forget, however i've always thought it would be the save weight as the B series, give or take 5-10lbs.

[aeolus]

too bad you couldnt slap an h22 on there.im curious to see how much those weight.

[GIZZ - EXV]

Good job, i wouldnt have had a scale to measure that myself. haha, K series is heavier after everybody claiming a 40lbs difference. internet hype, everybody on the K wagon now.

they other thing you will notice are 3rd gear dynoplots, why on earth to dyno the 6spd in 3rd? ive only seen one plot of a local to me toda'd out k20, hes not trying to fool anybody or himself! he's at 196.1hp, stock comp, but for the money he coulda been making some serious power with a B.

[JCushing]

Originally Posted by DefiantGSR

no, the blocks of the b18 and b20 are the same...just the cylinder is bored out a little more. in fact, that means a b20 should be lighter. but that weight is minimal.

yeah but the pistons are bigger than a b18 piston (bore differences are only gonna be grams). the only block that should really be lighter assuming intake exhaust clutch fw ect are all the same should be the b16 block since that block actually has a smaller deck (ie there is less actuall block there), has no girdle ect...

thats good to hear though since everyone is hyping up the k20 how its soo much lighter ect...

now that i think about it maybe its just the block thats lighter and the tranny is heavier.... trany parts are super heavy....

[hotintegranights]

maybe the k series tranny is lighter than the b series tranny,but either way you need tranny for the motor, so all that hyped and rumors people started just went down the drain. btw thankz for clearing all this up

[JCushing]

no i meant the k series engine might be lighter but the 6 speed tranny makes it heavier (extra gear extra length on the main/countershafts)

[Sobe_Death]

fluids in both engines?

[SMSP]

Originally Posted by aeolus

too bad you couldnt slap an h22 on there.im curious to see how much those weight.

yeh, what he said.

[SpdFrk]

Originally Posted by aeolus

too bad you couldnt slap an h22 on there.im curious to see how much those weight.

[743power]

good post, cant argue with longacre. Keep us posted on other engine weights if you can.

Thanks.

[alphajesse]

Originally Posted by Sobe_Death

fluids in both engines?

Yes... were both engines 'dry?'
What are the relative fluid capacities, and were both engines 'stock' or at least (for the b20VTEC) all OEM parts?


Almost forgot- h22 weight?

[duckmanEG]

Originally Posted by aeolus

too bad you couldnt slap an h22 on there.im curious to see how much those weight.

that would be the next big hype question to answer

[743power]

Originally Posted by duckmanEG

that would be the next big hype question to answer

brian g answered it in the hybrid forum. He said it was about 100 pounds more than a b16 and 80 pounds more than a b18c

[z6]

throw a z6 on there for me