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View Full Version : b16a to b20b


KnfUzn
26-12-2003, 10:14 PM
i own a GenIII CRX with the b16a motor, which part of the motor will i need 2 change to get the b20b in...?
OLM-02R
27-12-2003, 03:56 PM
wat are you planning to do anyways???more info thanx...
BLKCRX
27-12-2003, 07:03 PM
put a b20 bottom end in.. with a b16 head, convert the block to support vtec and thats all you need to do.... plus a ECU.

Regards James
KnfUzn
27-12-2003, 07:27 PM
thanks a lot.....

jus need a bit more power... i figure if i turbocharge it, why not turbocharge a 2.0litre
ALLMTR
27-12-2003, 07:45 PM
I wouldn't be turboing a B20vtec as the motor doesn't suit it
OLM-02R
27-12-2003, 10:15 PM
just change the block to b20 then b16 head then just get high comp piston....that should set u for now....till u want more power cheers...
EG5
28-12-2003, 06:43 PM
b20 block and CTR piston will do ... 4 u
TODA AU
28-12-2003, 09:47 PM
Do you supose the 3mm piston to bore clearence will be an issue... :D :P
BLKCRX
28-12-2003, 11:17 PM
Internet Mechanic's can make anything fit ! They don't even charge for labour ;) or ever get there hands dirty! Might as well make it 3" piston to bore clearances !
Thanks mr expert ! lol NOT


Regards James
Havok
29-12-2003, 04:43 PM
:shock:
ALLMTR
29-12-2003, 05:42 PM
OK

1) Head will need to drilled to allow for the different position of the dowels on a B20 as opposed to B16

2) Oil supply hole in VTEC head will need to be tapped and plugged at face surface

3) External oil feed line will need to be fitted. Usually "T" off oil pressure switch and run to fitting at rear of head adjacent to cyl 4

4) Pistons will need the inlet valve cutouts enlarged as the VTEC head runs a 33mm valve as opposed to 31mm on the B20 head

5) ARP head studs should be used

6) ARP rod bolts and closed and honed rods are HIGHLY recommended as you will be revving this motor a LOT higher than the bottom end was designed to

7) Ancillary items will have to be addressed due to the motors need for more air/fuel

Hope this helps
KnfUzn
29-12-2003, 08:46 PM
damn!
ALLMTR
29-12-2003, 10:31 PM
A mate just sent me the Hot 4's article. Hehehe those guys in Perth make it sound like they invented the Frank motor hehehe
Setanta
29-12-2003, 11:00 PM
lol - I've seen that happen before... pity the yanks have been doing it for ages ;)
A'PEXi
30-12-2003, 11:52 AM
which hot4s is this article in? or better - someone want to post up the article? :P
ALLMTR
30-12-2003, 02:21 PM
It's in the latest one. I don't buy it but a mate sent it too me