ANYONE RUNNING A B-20A5 BLOCK BUILT WITH A B-16 HEAD OR GSR HEAD ? IFSO WHAT KINDA RESULTS !

 

what is a B20A5 block from? an old prelude or something?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMdc2lsVtec &raquo;</TD></TR><TR><TD CLASS="quote">what is a B20A5 block from? an old prelude or something?</TD></TR></TABLE>
yeah...expletive that ****!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GUILOTINE &raquo;</TD></TR><TR><TD CLASS="quote">
yeah...expletive that ****!</TD></TR></TABLE>

yea, those blocks are weak and old as hell, and ive heard that they are the odd-ball B-series (the old prelude motors) and have no parts in common with anything else

 

not a very common platform to start out with

 

That's too bad because I read somewhere that the B20As where taller than B18b/c. Sorta like a factory deck plated block.

 

It has been done before. But great modification to the head and the gasket was needed. Tom Coleman at ludircouspeed used to offer a dohc vtec head kit for 3rd gen prelude owners.

 

those are the old skool prelude engine. i'd ditch it and get a newer b20b or b20z. much easier to do the conversion and will most likely have less miles

 

they are old but as old as a 1st gen B16A? so age shouldnt be a reason to ditch em since people still buy 1st gen B16A's.....wasnt there also a B21?

 

there cant be that much wrong with these engines if they are built. No one has really done this. Id say do it and put on a b16 head and break some ground. No one knew about lsvtec until it was done and even after myths about reliability surfaced and persissted on the h-t and superhonda bandwagons.

 

iirc, there are other differences which pose difficulties. the oil pan setup is one; mounts, another, and i don't think that the bolt pattern of the headbolts matches that of the newer Bs, either. i've also heard that those 95mm cranks are crapola. the compression is low, r/s ratio is ~1.49:1, and i don't suspect that the rods are all that good- all reasons why the proposed setup isn't so popular. i've read online of a few built ones making ok power, but they were also all in 3rd gen 'ludes, which few of us have or want. i've heard of a few peeps using those cranks to stroke newer b blocks, but with the availability of good aftermarket cranks now, or places like castillo which can prep an 89mm crank to 95mm, why bother with the b20a/b21 blocks?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fmrprojects &raquo;</TD></TR><TR><TD CLASS="quote">those are the old skool prelude engine. i'd ditch it and get a newer b20b or b20z. much easier to do the conversion and will most likely have less miles</TD></TR></TABLE>

the engine mount locations are different on the old b20/b21 blocks so the new ones wont fit i think unless you find some mounts, but i dont thing they make any

 

bad info on the cranks... i can attest to their worthiness i've done a couple CORRECTLY into b-series blocks with no issues and TONS of miles beating the crap out of 'em. for a while they got a bad rap because even crower wasn't preping them properly for use in the newer b-engines.

 

http://ludicrous2_0.tripod.com/vtec/

This page outlines a B20a vtec swap.