JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions? - Page 43 - Honda-Tech


JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Old 12-17-2016, 08:04 PM   #1051
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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X2 go with the healthier engine. Difference between PDE 00-01 and Non is PDE has 45 degree valve seat instead of a 60 normal h22. It also has slightly smoother casting in the intake runner. As well as the intake manifold gasket port nose are is a little bit more open and gasket matched. Due to has similar bottom intake/gasket as PDE Euro R.
Is this why the Type S cams eats up the normal H22 rocker pads? It's been a min, just trying to refresh my memories.
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Old 12-18-2016, 08:26 AM   #1052
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Aradin, good insights..

I think i still use the IABs for the low speed corners where i may fall out of vtec but dont want to downshift. And dont want to lose any lowend torque. But it would be nice to have a simpler set up and less parts to wear out or break, I always think about that IAB vacuum box and how i would ever replace it. My H23A came with the ports busted, i was hoping to have a back up. I may look into a Euro-R manifold, seems to be good middle ground. But the spacer like you said may be the easiest and fastest solution, i remember blacktrax selling these parts. Thanks reminding me! :-)
No problem. I would be willing to bet that you would see more torque under the curve and improved peak horsepower without IABs on the H23A versus your previous setup. The blue top's 95mm stroke makes an exceptional amount of low end/midrange torque.

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Is this why the Type S cams eats up the normal H22 rocker pads? It's been a min, just trying to refresh my memories.
That's a good question. I think that's the general consensus but it makes me wonder, what about the F20B? The PCB heads they come with seem to be based on the older P13 castings. As we know, the manual versions come with Type-S cams yet they didn't suffer from that issue.
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Old 12-28-2016, 01:33 AM   #1053
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

In H23 VTEC oil squirters are not necessary. There are grooves in bigger rod end that work like oil squirters and spray oil on the bottom of the pistons.
I wanted to install oil squirters in my H23A but it was impossible to bend them that they clear the pistons and crank.
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Old 01-06-2017, 11:49 AM   #1054
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

PCB F20B has there own heads... Could be 60 degrees as well.... I think the rocker wear was more of an issue with those trying to use stock P13 valve springs with TypeS/EuroR cams... Valves not being percisely in sync needing a stiffer spring with higher lift cam. But yes I think it was more common on the OBD1 motors with non behive LMAs
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Old 01-18-2017, 06:34 AM   #1055
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Tried looking through some pages of this thread, but figured someone could tell me more quickly. Are the H23A blue tops using the FRM lined cylinder walls like the 00-spec H22A found in USDM Preludes? Google searches yielded different results.
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Old 01-18-2017, 07:11 AM   #1056
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Tried looking through some pages of this thread, but figured someone could tell me more quickly. Are the H23A blue tops using the FRM lined cylinder walls like the 00-spec H22A found in USDM Preludes? Google searches yielded different results.
Yes.
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Old 01-19-2017, 04:56 AM   #1057
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Tried looking through some pages of this thread, but figured someone could tell me more quickly. Are the H23A blue tops using the FRM lined cylinder walls like the 00-spec H22A found in USDM Preludes? Google searches yielded different results.
Again....(sigh) All H motors are FRM sleeved.
Only F series motors have iron sleeves(minus the F20c - S2000 motor which does not apply here anyways)
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Old 02-24-2017, 10:00 PM   #1058
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

What piston rings do these bad boys use?

H22A4?
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Old 02-25-2017, 02:57 AM   #1059
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

All 97- H's use the same piston rings. I think.

H22A4-H22A8 and Type S/R have the same piston ring part number
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Old 02-27-2017, 10:59 AM   #1060
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

True should be no difference than H22 and ANY H23 on piston rings
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Old 03-16-2017, 11:34 AM   #1061
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

If someone wouldn't mind answering this question

H22 IACV will work on H23A Intake Manifold with Rosko IACV adapter?
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Old 03-17-2017, 11:45 AM   #1062
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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If someone wouldn't mind answering this question

H22 IACV will work on H23A Intake Manifold with Rosko IACV adapter?
It should that is what Rosko made the kit for Euro R 3 wire IACV to H22 IACV 2 wire... one bolt lines up other does not... thus need bracket.

Your better off getting the IACV relocation kit if firewall is close and or not a lot of room up front
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Old 03-20-2017, 06:57 AM   #1063
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Thank you ESP.net
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Old 03-22-2017, 07:42 AM   #1064
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Could someone with a EK H2B swap running stock IM measure the clearance between that and firewall please.

Thank you
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Old 03-23-2017, 04:47 AM   #1065
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Could someone with a EK H2B swap running stock IM measure the clearance between that and firewall please.

Thank you
Might have better luck in the hybrids/ engine swaps section with that question!
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Old 03-24-2017, 12:07 PM   #1066
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Those that are Straight H going to need one of these for the Lower K series intake manifolds. OEM Rear T Bracket wont work. It is also Slimmer, Stronger and Easier install. Installs only on driver side. This is not a for sale post do not ask how much.. PM with any question. Pictured is a K2H Excessive Intake manifold
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Old 03-27-2017, 06:30 AM   #1067
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Those that are Straight H going to need one of these for the Lower K series intake manifolds. OEM Rear T Bracket wont work. It is also Slimmer, Stronger and Easier install. Installs only on driver side. This is not a for sale post do not ask how much.. PM with any question. Pictured is a K2H Excessive Intake manifold
John,
Can you post pictures of the clearance issues with the stock rear mount and the K manifolds, I assume RBC is the one you are referencing?

I don't see how this affects the H23 any more than any other Vtec H-series engine, but keep it tech enough and I will be ok with it.
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Old 03-27-2017, 11:48 AM   #1068
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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John,
Can you post pictures of the clearance issues with the stock rear mount and the K manifolds, I assume RBC is the one you are referencing?

I don't see how this affects the H23 any more than any other Vtec H-series engine, but keep it tech enough and I will be ok with it.
Yes believe on the H swap with RBC it hits... With Excessive Mani as well which is even lower Hits a lot... Pictured is a K Excessive with 80mm TB... thought I would answer this instead of later... believe it hits the top of the OEM Rear T Bracket.
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Old 04-22-2017, 08:54 AM   #1069
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Hey everyone. First post on honda-tech.

Forgive me for not rifling through this whole thread. I'll do a bit of that after I put this post up. I've got a 98/P13 H23A I'm building. It's for a daily'd 5th gen Prelude.

I'm looking to run Type S pistons for a slight bump in CR, so in terms of the bottom end, I can just get the rotating assembly balanced, use the Kaizenspeed Balance Shaft Delete, hone the bores, put in all new rings/bearings, and go.

I've been seeing some sources saying Type S pistons will come up out of the cylinder and kiss the valves on an H23A? And that the rods need to be modified to run Type S floating pins?

Any truth to this? Also, what about clearance issues any may have come across when putting a Stage 1 cam in there?
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Old 04-22-2017, 11:32 AM   #1070
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

Ill see if I can answer this quickly... yes there has been some issues with say pro 1 and h23v bluetop... being close to the valve reliefs. A typical h22 piston will be in the hole 6k. The h23v BlueTop seems to be deck level 0 so already 6k in disadvantage... I would compensate with a 40k thick cometic headgasket. Yes this will lower your compression a tad... obd2 should all be floating pins. So should be a drop in with Type S.
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Old 04-23-2017, 06:47 PM   #1071
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

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Ill see if I can answer this quickly... yes there has been some issues with say pro 1 and h23v bluetop... being close to the valve reliefs. A typical h22 piston will be in the hole 6k. The h23v BlueTop seems to be deck level 0 so already 6k in disadvantage... I would compensate with a 40k thick cometic headgasket. Yes this will lower your compression a tad... obd2 should all be floating pins. So should be a drop in with Type S.
So on the stock piston height/valve relief shape, I'll need to go to a 0.040" head gasket? Or is this with a Type S piston?

If this is on the Type S I might be okay with that, since this would put me in the neighbourhood of 11.6:1 CR (without taking into account valve pockets) courtesy of the good ol' zealautowerks compression calculator.

Gah...the gears are turning in my brain to do an 89mm bore/Wiseco piston/Darton MID sleeve. Hmm...
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Old 04-24-2017, 12:32 PM   #1072
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Default Re: JDM H23A Vtec Blue Top Mystery Motor, True Facts, Questions?

I would give your self a 40k gap... no matter how you figure it... Do I guarantee anything no... math seems right....

H23V with Stock rods 141mm Type S pistons 40k headgasket math tells me 11.1-1
H23V with Eagle H23A1 rods 141.5mm Type S pistons 60k headgasket math tells me piston will be out of hole 20K. Add 40K ontop you get 60k thick headgasket brings it down to 11.0-1
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