I was looking for a cheap f23sohc to turbo and I found a 99 jdm h23 dohcvtec for 2595.95 complete swap(engine,trans,ecu,harness). How do I know if this is the real deal jdmwagon and not a missprint. I emailed the site about 10 min ago but I don't expect a reply during the weekend. I asked for pics Of the block code and the valvecover. If it is a h23dohc what is the compression ratio? I was going turbof23 but if this is worth the effort I will swap then turbo later. ANy comments??


Modified by fastsohc at 1:37 AM 6/12/2004

 

just get an h22, more power

 

I just thought it might be an eaiser swap since I have a 99 accord and all.

 

and if the compression ratio is lower it may be the right engine for high boost
I read in the archives that it may have different cams.

 

Go H23, more power to start with.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Juccord &raquo;</TD></TR><TR><TD CLASS="quote">Go H23, more power to start with.</TD></TR></TABLE>

How does a h23 have more power than a h22?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastsohc &raquo;</TD></TR><TR><TD CLASS="quote">and if the compression ratio is lower it may be the right engine for high boost
I read in the archives that it may have different cams. </TD></TR></TABLE>

It does since it doesn't have vtec (to begin with) but many people have added the h22 head and ran the necessary components for vtec.

If you want for a 99 accord since it is obd2, go with a h22a4 (that is the newer h22) versus the h22a1.

 

there was a short time (two years i believe) that the accord wagons in japan were using the h23 vtec motors which made 220hp...unfortunately, they were all mated to automatic tranny's and were somewhat rare (like the accord wagons here)...so if you see an h23 vtec that is mated to a manual transmission, you can pretty much guaruntee that it's either not real, or at least been fucked with....

the h23 vtec had 11:1 compression along with pretty aggressive cams (same ones used in the si-r, type r and euro r)...that's why they are so expensive if you can get your hands on a set...this motor also has a pretty square r/s ratio (not positively sure of the numbers), but redline was 8200 rpm's....

the only problem is that there are a lot of companies out there who take a usdm h23 block and mate it with an h22 head and call it an h23 vtec from the rare accord wagons...they also say that the motor has the same 8200 rpm redline, which will cause lots of problems since the usdm h23's redlined much lower and aren't able to take the 8200 rpm's...

if you can, check the compression of this motor...ask in the prelude forum what the typical numbers for a compression check are for a usdm prelude with an h23, and make sure that the h23 vtec has much higher compression that that...if not, you are getting screwed...

cliff notes: don't get screwed...

 

they never made 220 hp
they have always been 200hp engines.
2 years ago they were still listed on honda.co.jp as new models and they were rated at 200ps with 163 ftlbs
they amde the power at lower rpm than the h22a as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s &raquo;</TD></TR><TR><TD CLASS="quote">they never made 220 hp
they have always been 200hp engines.
2 years ago they were still listed on honda.co.jp as new models and they were rated at 200ps with 163 ftlbs
they amde the power at lower rpm than the h22a as well.</TD></TR></TABLE>

no, the h23 vtec's from honda were rated at 220 hp at 8200 rpm's...if you are referring to the models from 2001 and 2002, those switched back to the h22 and had an optional lsd and 5 speed transmission...the 99-00 models were the ones that came with the h23 vtec option...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nick H &raquo;</TD></TR><TR><TD CLASS="quote">there was a short time (two years i believe) that the accord wagons in japan were using the h23 vtec motors </TD></TR></TABLE>

[johnny carson] I didn't not know that [/johnny carson]

Well I guess the reason I said the comments about the h23 was due to majority of products that are "jDm" turn out to be either a fake or the real deal, I am aware the h23 frankenstein (usdm) can be done but figured also since he was talking low compression that meant again referring to h23 usdm.

If it is a true JDM h23 vtec, sounds like a good deal for 2500ish, but if it is a frankenstein h23 then I would opt for a h22 mainly due to reliability

Nick

 

I am still waiting on a reply from the seller to see what this came out of. I think its real but I would like to see some actual block numbers I have a picture of it in my Email but I have no idea how to post it. if it is the real deal will it positively come with an automatic? If so should I use my accord 5 speed or buy a prelude tranny.

 

i am not positive on this but if the tranny will match up with the h22 then i would go with that tranny rather than the accord one. But like i said i am not totally sure that they line up.

 

i dunno about that. make sure that the seller knows what he is selling. ask for a pic of the code on the block

 

ok lets just say it is the H23 from the SiR. How much of it is interchangeable with the h22a ? Ive found it is an open deck block newer design than the H22. Since its still the H-series I'm thinking the f-max turbo should bolt right on up. And since this engine did come directly from a accord the wiring harness shouldn't have to be modified like the H-22 harness. If this is the real deal and it makes 200hp I can probably put type s style cams in it right???