JUN internals in a H22A or H23A block?
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Joined: Oct 2002
Posts: 206
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From: Melbourne, Australia
JUN internals in a H22A or H23A block?
Hi guys...
I was reading the H22 -> H23A VTEC thread in the Prelude forum... And it made me starting to wonder about my all motor project using JUN internals...
The bore and stroke are still remains at stock 87.0mm x 90.7mm
The JUN Stage 2 cams are have the same Valve lift to the Type S cams:
i.e Intake 12.2mm and Exhaust 11.2mm
http://www.junauto.co.jp/democ...ml?en
Bascially the H22A in the JUN Super Lemon runs a 12.3:1 Compression Ratio and uses the Euro R single Stage manifold to push out a staggering 269PS @ 7250RPM
H22A is 2156cc and i read somewhere the H23A is 2258cc
That makes it a 402cc difference... is that because of the H23A crank? or the block
of the H23A?
So to my understanding, if i drop the JUN internals into the H23A due to the higher rod ratio it should increase the CR as well compared to the H22A?
Btw what is the rod ratio of the H22A and the H23A? Whats stopping me from using a h23A crank in a h22a block?
BTW i forgot to mention using the JUN Pistons in the block
I was reading the H22 -> H23A VTEC thread in the Prelude forum... And it made me starting to wonder about my all motor project using JUN internals...
The bore and stroke are still remains at stock 87.0mm x 90.7mm
The JUN Stage 2 cams are have the same Valve lift to the Type S cams:
i.e Intake 12.2mm and Exhaust 11.2mm
http://www.junauto.co.jp/democ...ml?en
Bascially the H22A in the JUN Super Lemon runs a 12.3:1 Compression Ratio and uses the Euro R single Stage manifold to push out a staggering 269PS @ 7250RPM
H22A is 2156cc and i read somewhere the H23A is 2258cc
That makes it a 402cc difference... is that because of the H23A crank? or the block
of the H23A?
So to my understanding, if i drop the JUN internals into the H23A due to the higher rod ratio it should increase the CR as well compared to the H22A?
Btw what is the rod ratio of the H22A and the H23A? Whats stopping me from using a h23A crank in a h22a block?
BTW i forgot to mention using the JUN Pistons in the block
Member
Joined: Mar 2002
Posts: 8,113
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From: East Village, NYC
Re: JUN internals in a H22A or H23A block? (Ryu)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ryu »</TD></TR><TR><TD CLASS="quote">H22A is 2156cc and i read somewhere the H23A is 2258cc
That makes it a 402cc difference... is that because of the H23A crank? or the block
of the H23A?
So to my understanding, if i drop the JUN internals into the H23A due to the higher rod ratio it should increase the CR as well compared to the H22A?
Btw what is the rod ratio of the H22A and the H23A? Whats stopping me from using a h23A crank in a h22a block?
BTW i forgot to mention using the JUN Pistons in the block</TD></TR></TABLE>
The strole makes more displacement. 87mm x 95mm = 2258cc.
You can 't put JUN internals in an H23a....it has a non-VTEC head. The best you can do here is slap your H22a JUN head onto an H23 block.
Anyways the H23a as a LOWER rod ratio not higher...H23A is 1.49 H22a is 1.58 same as B18C.
Alll things being equal, if you increase the stroke and use the same pistons/head CR goes up.
Nothing is stopping you from using the H23a crank AND RODS in the block expect risk. You are plannign to use the JUN 12.3:1 pistons? well with an H23 crank your motor won't last long...your CR would be very close to 13:1....
Basically I'm saying high revving a big crank is not reliable in the long-term, but you can use an H23 crank and rods in an H22a block if you want.
That makes it a 402cc difference... is that because of the H23A crank? or the block
of the H23A?
So to my understanding, if i drop the JUN internals into the H23A due to the higher rod ratio it should increase the CR as well compared to the H22A?
Btw what is the rod ratio of the H22A and the H23A? Whats stopping me from using a h23A crank in a h22a block?
BTW i forgot to mention using the JUN Pistons in the block</TD></TR></TABLE>
The strole makes more displacement. 87mm x 95mm = 2258cc.
You can 't put JUN internals in an H23a....it has a non-VTEC head. The best you can do here is slap your H22a JUN head onto an H23 block.
Anyways the H23a as a LOWER rod ratio not higher...H23A is 1.49 H22a is 1.58 same as B18C.
Alll things being equal, if you increase the stroke and use the same pistons/head CR goes up.
Nothing is stopping you from using the H23a crank AND RODS in the block expect risk. You are plannign to use the JUN 12.3:1 pistons? well with an H23 crank your motor won't last long...your CR would be very close to 13:1....
Basically I'm saying high revving a big crank is not reliable in the long-term, but you can use an H23 crank and rods in an H22a block if you want.
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