I started my turbocharging days with this motor, after it continued to blow head gaskets and piss me off i ditched it for an H22..
Well years later i decided to try it again, except this time cheaper, not pushing it as hard and leaving the motor fairly stock.
I found a pretty clean chassis with a blown up, already in pieces B21A1 for 650 bucks towed it home and started tearing it apart.
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got the motor out and cleaned up the bay a bit
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Bought a different block, the b21 is FRM. B20a5 is normal iron, bought the b20a5 short block in pieces for 100 bucks threw down a sick hone job and bought an Ebay evergreen rebuild kit.
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H23 rods are a direct swap for these engines, and there much stronger looking then stock, scored a set for free
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instead of cleaning the stock pistons and risk breaking them upon removal i bought a set of B series cast nippon turbo pistons, for the price why not.. had the wrist pin bores honed to fit. Combined with the b21a1 head we now have a really low compression b20a5 ( about 7.9) spent more than i wanted on that but got the rods, turbo, and injectors for free so i spent money else where.
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decided to do a quick cleanup job on the head, lapped all the valves replaced stem seals, and cleaned up the valve bowls, got the head resurfaced for free, Thanks Kyle!
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motor going together
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Being this is a bastard child of a motor there is no cheap cast iron china turbo manifolds out there, so i bought one for an H22a and made it work... drilled/hogged out a few holes, nigger rigged the gasket and WALA
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Got an old Garrett T3 turbo off a mustang/tbird for free, had tons of shaft play but in otherwise decent shape, got a rebuild kit for it off ebay, took it to work and sandblasted it all up.. 75 bucks into the turbo
modified the compressor outlet for a normal coupler, and built a gay little flange for the air filter
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Pretty much no way to fit internal wastegate with the H22a manifold which sucks so i niggered a external setup with a really chinese wastegate and recirced it back into the downpipe, thanks Columbia River Mandrel Bending for the quick shipping and awesome prices/RHMT discount!
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intercoolers are a pain in the ass and somewhat of a nigger to install on these old preludes, so i stole a meth kit for 150 bucks and used the ECU to control it..
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Got the BOV for free thanks NOL!
Got a steal on S300 ,already installed in a P75 Vtec and boost control ready! i know Hondata is hated around here but for 350 bucks..
Finished product, daily driving it on 10psi
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All in all i have about 2400 bucks into the entire setup including the cost of the car and a new Comp Clutch