Is there an internal difference between the B16,17,18c blocks? I guess my question is, could one swap cranks and rods as they please? I know the B16 (B17?) has a 7mm shorter deckheight but say if it was deckplated would the B18 internals fit? I was just wondering due to the fact that I can find a B18c block anywhere and might resort to deckplating my B16 and using the B18c internals. I don't want to use a non-vtec block to save the trouble of running an external oil feed to the head. Any info is appreciated.

-Ryan

 

I'd like to know too. my buddy and I were just talking about that the other day. can parts be swapped? well, cranks specifically. I doubt it though dude, I mean, if you could just swap out cranks and stuff, no one would go to the trouble of a b20 ls/vtec deal. they'd just through the crank and rods over to a b18. yaknow?

 

well there are quite a few differences. of the top of my head i'll try to list some.

Crank Stroke
B16A--77mm
B17A--81.4mm
B18C1/5--87.2mm
B18B--89mm

Rod Length
B16A--134mm
B17A--137mm
B18C1/5--137.9mm
B18B--137mm

Deck Height (roughly)
B16A/B17A--203mm
B18B/C--212mm

Bore Size
all the same at 81mm

Head
B16A/B17A/B18C5 use the PR3 style head
B18C1 uses the P72 head
B18B uses the P75 non-vtec head

Oil Feed Lines
the VTEC blocks are a bit different than the non-VTEC blocks for the oil feed


as you can see not everything can be just swapped due to different sizes, specs etc. hope this helps some.

 

You can swap the B18 internals as you please but I am looking more at the B16 end of things. The reason people don't swap for the B20 intenals is that the R/S is worse than in the vtec engines. Another reason people stick to the B20 is the larger displacement from the 84mm bore.

-Ryan

 

Yeah I realize that but the main question I have is, is there enough room for a B18c crank to swing around in the B16 bottom end? Thanks for the info.

-Ryan

 

Sorry I can't give hard facts but I think the only thing you'd need to do that is either a deck plate or custom pistons...or both?

 

Yeah, I plan on deckplating if the crank will fit. Just want to be sure before I go and dump a bunch of money into this. Thanks for the reply.

-Ryan

 

Good info but just a small correction the Stroke on the B16A is 77.4mm confirmed with the Helms manual. If you do the Compression Ratio Calcualtor on C-Speedracing's site it has it as a 77mm stroke and the final Displacement comes in at 1587.31*****cc but if you put the correct stroke in it will be 1595cc
http://www.c-speedracing.com/howto/c...c/compcalc.php

 

Yes you can swap cranks and deckplate the motor but will need a custom rod in the motor and you wanna make sure to keep the R/S ratio in check too.

 

Thank you sir. That is exactly what I was looking for. I thought the same but I just wanted to be positive. Thanks again.

-Ryan

 

thanks for the correction.

yes you can use the B18C crank in the B16A block, but as was already mentioned you'll need that deckplate (which you plan on) and a longer rod will need to be used. unless for some reason the deckplate is measured so that the OEM length B18C rods fit perfectly. but most likely the rods will have to be custom made to work/fit properly with the deckplate.

so what's the plan then? B16A block with deckplate, GSR crank and custom rods? or are you going to resleeve and overbore also?

just curious why you wouldn't use a B18C block instead of using a B16A with deckplate to gain 1.8+L.

 

... another question... is there any difference between the obd1 and obd2 b18c1 blocks?... i think they are the same, i just wanna confirm... i am planning on getting a spare block to build up and i wanna make sure... thanks...

 

the only difference is usually on the oil cooler on the filter....OBD 1 that I have seen comes with oil cooler, you can remove it and buy the adapter to run it without the cooler...

and the oil pump is also different, the OBD 1 mostly don't have the crank fluctuation sensor, while OBD 2 does, but you can swap the oil pump and it'll be done...

that's the only difference....

stan

 

Don't forget the girdles on the VTEC engines and also oil squirters.

 

yep that's true.

 

yes i forgot to mention that. the B18C1/5 have block girdles, the rest don't.
all the VTEC equipped blocks have oil squirters too.