JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
04-13-2013, 06:29 AM
#851
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
My h2b is using a h23a. Runnng Hondata. I'm a novice tuner. Went to efi classes tuned bunch cars. Anyway. Idk why but my h23a just falls on its face at about 6k. It will spind tires easy in 2nd but then it just looses power. It's not dyno tuned. But I started w the Hondata map. Street tuned air fuel ratio . To mid 12's. but no matter what I do why the wot ignition from 15-35 degrees I've tried,, and it just aint right. Has rmf rep header nice intake pipe. So. I know it needs a true dyno tune. But I know something just ain't right. It should pull way different then it does even on the basemap , so trying get it figured out b4 I spend 400$ to rent the dyno time. Sorry for long *** post. Or can some one send me a base map they no wrked decent ? I did have to really mess w the h22 map alot just to get it to run,, ?? Lol. Doubt i'll get any help on here but. Worth a shot
04-13-2013, 07:46 PM
#852
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
My h2b is using a h23a. Runnng Hondata. I'm a novice tuner. Went to efi classes tuned bunch cars. Anyway. Idk why but my h23a just falls on its face at about 6k. It will spind tires easy in 2nd but then it just looses power. It's not dyno tuned. But I started w the Hondata map. Street tuned air fuel ratio . To mid 12's. but no matter what I do why the wot ignition from 15-35 degrees I've tried,, and it just aint right. Has rmf rep header nice intake pipe. So. I know it needs a true dyno tune. But I know something just ain't right. It should pull way different then it does even on the basemap , so trying get it figured out b4 I spend 400$ to rent the dyno time. Sorry for long *** post. Or can some one send me a base map they no wrked decent ? I did have to really mess w the h22 map alot just to get it to run,, ?? Lol. Doubt i'll get any help on here but. Worth a shot
and also www.xenocron.com
04-13-2013, 10:59 PM
#853
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Yeah sure if you feel like blowing a ton of money to be faster than a stock Legacy B4. The amount of money you spend on a turbo kit you could have bought the legacy as a second car lol
04-29-2013, 03:18 AM
#854
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Search isn't working right now -
What specs do I use for a valve lash adjusment?
EDIT - nvm found it
What specs do I use for a valve lash adjusment?
EDIT - nvm found it
05-06-2013, 11:24 PM
#855
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
the lash adjustment in the honda service manaul reads .006-.007 intake and .007-.008 ex, the high and low is for highest and lowest setting no higher than .007 on intake and no lower than .006 same for ex. feel between the cam lobe and rocker with each cylinder at tdc use you cam marks to help start with #1 at tdc and then turn the crank counter clock wise to do cylinder 3 then 4 then 2. i just did this on my h22 and it runs 100 times smoother even stoped the chatter
https://honda-tech.com/forums/honda-prelude-4/need-consistant-info-h22-valve-lash-adjustment-3032700/
There you go.
https://honda-tech.com/forums/honda-prelude-4/need-consistant-info-h22-valve-lash-adjustment-3032700/
There you go.
05-16-2013, 05:45 PM
#856
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
i started to refreshing the JDM H23a Distributor and ran into two problems i cant find the right rotor for it and when i tried to convert it from OBD2 to OBD1 with a jumper harness but i ran into a problem. can anybody help me out please. this swap is going into a ef..
05-16-2013, 06:25 PM
#857
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Thread Starter
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
I forget what model possibly 90-91 dx/lx but whatever 90-93 Accord that is internal coil. The coil/igniter/rotor/distributor cap should be the same.
05-16-2013, 06:53 PM
#858
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
05-17-2013, 04:25 AM
#860
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
and you see close only the big plug connects theres nothing for the smaller plug to connect to... is that going to be a problem? and does anybody on here have a wire diagram so i can just depin the stock dizzy plug and add the the obd1 plug on to it?
05-17-2013, 02:39 PM
#861
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
bump heres better pictures of the plug from the dizzy. im not sure how i should wire this up to obd1 w/internal coil, can anybody help me out please..
05-20-2013, 06:30 PM
#862
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Check out this post:
https://honda-tech.com/forums/showpo...8&postcount=53
You add one wire, move another wire, and connect those two to the 2-pin obd1 plug.
https://honda-tech.com/forums/showpo...8&postcount=53
You add one wire, move another wire, and connect those two to the 2-pin obd1 plug.
05-21-2013, 07:37 PM
#863
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Check out this post:
https://honda-tech.com/forums/showpo...8&postcount=53
You add one wire, move another wire, and connect those two to the 2-pin obd1 plug.
https://honda-tech.com/forums/showpo...8&postcount=53
You add one wire, move another wire, and connect those two to the 2-pin obd1 plug.
07-04-2013, 01:40 PM
#864
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Soooo......does nobody have a pinout for the PCF ecu? I've been searching everywhere for a solid week and found nothing. Might end up removing and selling the H23A 
07-15-2013, 07:15 PM
#865
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
I have a actual helms for this motor. It is in Russian though. I ran a pdf program and made it searchable so you can go to Google translate ;English to Russian; type what you want and copy paste to search in pdf. Can I post attachments? I did this swap in my 90 cb7 and just kept my f22auto with tcu as 01 tranny wouldn't fit and didn't have fundage for manual swap. Runs great decided to just keep it auto for now. Much faster than my f22. Lol
10-01-2013, 10:05 AM
#866
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
mind = 
great info here!
I missed the part about the cams,.. same as type s??
great info here!
I missed the part about the cams,.. same as type s??
Last edited by kingofbattle909; 10-01-2013 at 10:22 AM.
10-01-2013, 11:41 AM
#867
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Type-s has way more aggressive cams/valvetrain and is 11.0:1, H23V is only 10.6:1
11-13-2013, 06:13 AM
#868
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
i just have 2 quick questions, what valve cover gasket do i use and what spark plugs do i use? 00-01 h23a
11-14-2013, 09:21 AM
#870
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Thread Starter
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
I have measured the cams as well to compare to F20BMT/EuroR/TypeS they are smaller. Swapped cams in my JDM DC2 with PS for F20BMT/EuroR/TypeS with matching valvesprings/retainers 210 hp 174 trq
01-08-2014, 04:26 PM
#872
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
I just ordered my blue top and can't wait to install it in my 2000 Civic Si!
Is there a parts list for what is needed for the manual timing belt tensioner conversion? There is a list of hardware on page 15 of this thread, but I believe that is for people who already have an H-series motor with a manual tensioner that they wish to re-use. Thanks!
Is there a parts list for what is needed for the manual timing belt tensioner conversion? There is a list of hardware on page 15 of this thread, but I believe that is for people who already have an H-series motor with a manual tensioner that they wish to re-use. Thanks!
04-13-2014, 06:37 AM
#873
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JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Hey guys working on a breakdown of the JDM H23A myself seeing that my piston rod bent.
I noticed that the size of the mains from the JDM H23 to the H22A4 are completely different sizes.
There is no squirters in the H23 but potential to add them in the block
There is a little difference in the guard for the crankshaft
The piston rods are the big difference. They do not use the six point nut to keep the rod on the crankshaft instead they use a 10 point bolt to hold it in.
I'm still doing the breakdown but I should have more information later today with pictures if not soon.
I noticed that the size of the mains from the JDM H23 to the H22A4 are completely different sizes.
There is no squirters in the H23 but potential to add them in the block
There is a little difference in the guard for the crankshaft
The piston rods are the big difference. They do not use the six point nut to keep the rod on the crankshaft instead they use a 10 point bolt to hold it in.
I'm still doing the breakdown but I should have more information later today with pictures if not soon.
04-13-2014, 03:13 PM
#874
Honda-Tech Member
Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
yes
Buy a KaizenSpeed tensioner and call it a day.
The H23aV has 55mm mains and H22A4's pending on year it came had 50mm AND 55mm mains so you need to be more specific on exactly which year A4 before saying they are different. They only came in two sizes.
And PS if you are replacing your bent rod dont get a H23A1 rod without replacing ALL of them. H23aV blue-top have .0020" shorter rods then the A1's.
Also you can install oil squirters on ANY H series block. The H23aV and even the H23A1 have oil passages in the rods them selves that help lubricate. So although you can install some, not 100% needed.
I just ordered my blue top and can't wait to install it in my 2000 Civic Si!
Is there a parts list for what is needed for the manual timing belt tensioner conversion? There is a list of hardware on page 15 of this thread, but I believe that is for people who already have an H-series motor with a manual tensioner that they wish to re-use. Thanks!
Is there a parts list for what is needed for the manual timing belt tensioner conversion? There is a list of hardware on page 15 of this thread, but I believe that is for people who already have an H-series motor with a manual tensioner that they wish to re-use. Thanks!
Hey guys working on a breakdown of the JDM H23A myself seeing that my piston rod bent.
I noticed that the size of the mains from the JDM H23 to the H22A4 are completely different sizes.
There is no squirters in the H23 but potential to add them in the block
There is a little difference in the guard for the crankshaft
The piston rods are the big difference. They do not use the six point nut to keep the rod on the crankshaft instead they use a 10 point bolt to hold it in.
I'm still doing the breakdown but I should have more information later today with pictures if not soon.
I noticed that the size of the mains from the JDM H23 to the H22A4 are completely different sizes.
There is no squirters in the H23 but potential to add them in the block
There is a little difference in the guard for the crankshaft
The piston rods are the big difference. They do not use the six point nut to keep the rod on the crankshaft instead they use a 10 point bolt to hold it in.
I'm still doing the breakdown but I should have more information later today with pictures if not soon.
And PS if you are replacing your bent rod dont get a H23A1 rod without replacing ALL of them. H23aV blue-top have .0020" shorter rods then the A1's.
Also you can install oil squirters on ANY H series block. The H23aV and even the H23A1 have oil passages in the rods them selves that help lubricate. So although you can install some, not 100% needed.
04-15-2014, 08:16 AM
#875
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Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?
Would I be able to use the stock H23A Vtec Fuel Rail w/ my h22a4 Fuel Injectors? Just was curious because the H23a Vtec Fuel rail looks like a nicer billet aluminum look to it. Ive tried searching but didnt come up with an answer.