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93 Prelude H23a1 Valve lash

 
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Old 12-21-2011, 03:44 PM
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93 Prelude H23a1 Valve lash

My Prelude has a bit over 230,000 miles on her. Valve train had some rattle to it so I popped the cover and intake was a tight 0.005in. and exhaust was some where in the 0.009in. Book says intake 0.003-0.004 in. or 0.07-0.11mm exhaust 0.006-0.007 in. or 0.15-0.19mm. I adjusted intake to a tight 0.004in. and exhaust to a loose 0.006in. When i start my car to warm up it up theres less valve train noise and better response. After its been driven for a while seems to be a bit of valve train noise around #1 or #2 cylinder and seems not as good of response in power. I know that at first when driving a car from a cold start you always get better response because things are cold and tight and after warmed up for a bit things tend to be looser and not so responsive. So was thinking of adjusting valve lash a bit tighter for both intake and exhaust to see if there any difference in power? Anyone that has any experience with valve lash please let me know your experience and wise knowledge. Thanks in advance O gurus of valve lash knowledge.
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Old 12-22-2011, 12:41 AM
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Re: 93 Prelude H23a1 Valve lash

What you set them at are the correct specs. Older engines with higher mileage will tend to have a bit more noisier valvetrain.
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The H22 wakes up the Accord in the same way a set of secondaries did to your father's Oldsmobile.

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Old 12-22-2011, 02:10 AM
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Re: 93 Prelude H23a1 Valve lash

I figured it was good but was wondering if i tighten them a bit more what i would get for a power response? They previous owner had gapped the spark plugs at .60 and the valves were much larger also? mayb he was thinking bigger spark and more gas and air to combust? Hell I dont know but i get alot better response out of her now with the valve lash specs. i stated earlier and plugs gapped at .44 Thanx for your response i appreciate it.
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Old 12-22-2011, 02:17 AM
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Re: 93 Prelude H23a1 Valve lash

Either he didn't gap the plugs or he's got some ignorant theory behind that .60 gap for more power. Lol. And I doubt he has larger valves, because the valve seat would need to be machined for the oversize valves to fit properly.

You can try a thousand of an inch lower than spec to see if it'll get quieter and if it'll gain more engine response. Otherwise, just do a basic engine tune-up.
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Old 12-22-2011, 02:55 AM
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Re: 93 Prelude H23a1 Valve lash

Yeah he had Superman emblems where the H is on front and back of the car and handed me the keys had one on key chain. lmao i was like WTF! So go figure. This is my first Prelude that doesnt have any major damage or really any damage at all just cosmetic. I was pretty stoked cuz my grey lude had a salvage title and then some lady ran into the front drivers side. I had purchased all parts to do a manual swap bcuz it was auto and i have an 98 F20B Double over head cam vtec on an engine stand in my garage that was going into it also. But was kinda hessatent on putn all the time and $$ into a salvaged car. Now I got This red lude and its a manual tranny but now I want to build the F20B up. Bigger pistons say 88mm. and longer stroking crank stage 1 or 2 cams. Bisi cams. I know if i dont i will b disapointed in less torque situation.I think the H23a1 will hold up till i get the f20b done in a year or so.
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Old 12-22-2011, 03:22 AM
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Re: 93 Prelude H23a1 Valve lash

Nice. Lol. That is funny with those Superman emblem.

Anyways, do build that F20B up. Parts are kind of hard to source for an F20B; bottomend wise. Parts for the head are a bit easier to find, except that the F20B uses different valves and not the same as an H22 from what I've been told.
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Old 12-22-2011, 03:27 AM
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Re: 93 Prelude H23a1 Valve lash

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Originally Posted by Kirk View Post
I know that at first when driving a car from a cold start you always get better response because things are cold and tight and after warmed up for a bit things tend to be looser




actually when they are warm is when they produce power... things seal up. I cant imagine redlining/racing a cold engine.
Its the cold, densely packed air that makes the power, more atoms means more bang.

just run your A/C line into your intake and turn knob to full...

haha jk, but no really, look into "thermo gaskets".
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Old 12-22-2011, 03:32 AM
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Re: 93 Prelude H23a1 Valve lash

Ive been doing a bit of studing on F20B builds and Honda Tech has a guy on there Jr. Delon that has documented his build thoroughly.So I can hopefully pm him and get all the info i need for the build. Yes the vavle are somewhat smaller than the h22.Might have to get aftermarket pistons too and have someone make a headgasket. So Just being able to find a shop around town that I can trust will do good work. Plus I got A boy now 21months old. Things have slowed down on Big boy toys lol. yeah i got a thermo gasket for the intake. using H22a4 intake bcuz of the iacv being 3 wires instead of 2. So obd1 h22a4 intake and T.B. F20B runners and inj. just loose the resistor box. Getn a p72ecu through pharable $175. the list keeps growing lol. but summer is coming so more work means more money.

Last edited by Kirk; 12-22-2011 at 03:38 AM.
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Old 12-22-2011, 03:45 AM
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Re: 93 Prelude H23a1 Valve lash

Dude i was trying to figure a way to make intake air significantly cooler myself. yes cooler air more atoms bing bang. i know a guy using some kind of hydrogene machine on his scion gives more power and save gas by using hydrogene at times? an old boss of mine. I forget the web site but he says it works. I was actually thinking of wrapping a coolant line around my intake tube or some kinda crazy **** like that. lol so its good to know im not the only one thinking that!
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Old 12-22-2011, 05:36 AM
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Re: 93 Prelude H23a1 Valve lash

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Old 12-22-2011, 10:42 AM
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Re: 93 Prelude H23a1 Valve lash

I have a leafblower around the shop somewhere? Now wheres my duct tape and bailing wire? Were gonna get some mad power now son! lmao Hey wait u making fun of me? Static420 yeah i had that whole colder tighter thing mixed up hu? Metal expands when heated duh? Hey look theres a new idiot on PZ! ME!

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Old 12-22-2011, 01:22 PM
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Re: 93 Prelude H23a1 Valve lash

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Ive been doing a bit of studing on F20B builds and Honda Tech has a guy on there Jr. Delon that has documented his build thoroughly.So I can hopefully pm him and get all the info i need for the build. Yes the vavle are somewhat smaller than the h22.Might have to get aftermarket pistons too and have someone make a headgasket. So Just being able to find a shop around town that I can trust will do good work. Plus I got A boy now 21months old. Things have slowed down on Big boy toys lol. yeah i got a thermo gasket for the intake. using H22a4 intake bcuz of the iacv being 3 wires instead of 2. So obd1 h22a4 intake and T.B. F20B runners and inj. just loose the resistor box. Getn a p72ecu through pharable $175. the list keeps growing lol. but summer is coming so more work means more money.
Yeah. One guy I know went from an F20B to an H23A VTEC blue top simply because it lacks of aftermarket support. But I bet there's more supports out there now for the F20B. And I have a baby on the way too. Won't be touching my car anymore, but I've already did as much as I can to sqeeze out as much power w/o upgrading the bottomend.
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The H22 wakes up the Accord in the same way a set of secondaries did to your father's Oldsmobile.
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Old 12-22-2011, 10:38 PM
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Re: 93 Prelude H23a1 Valve lash

I had to let my girlfriend use my red prelude to get backandforth to work. I get her accord fixed and got my lude back. I jump in her and smell rotten milk and there were toaster popups and assorted crackers all over back seat from my 21 month old! I was pissed. Babies change everything!
H23a3 Blue top is my next project. I so gotta have one of those!

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Old 12-23-2011, 01:38 AM
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Re: 93 Prelude H23a1 Valve lash

haha, awesome video..
good luck with the bluetop, we got the same goals in mind for the H23's !
ill be watchinZ :)
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Old 12-23-2011, 02:04 AM
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Re: 93 Prelude H23a1 Valve lash

Here is some pics cuz I know how we all like pics! These are my F20B vtec sitn on my engine stand and I repainted the valvecover, Intake mani. Black wrinkle paint is what I went with. They dont make a blue wrinkle paint or it would be blue, The valvecover. Oh and a pic of a cracked out looking possum. Why? cuz I can!
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Old 12-23-2011, 02:18 AM
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Re: 93 Prelude H23a1 Valve lash

****ing lovely !
jealousy taking over !!!!!
the black intake is just too much !!!!!!!!!!!!!!!
but omg i could imagine the blue..

looks almost like u got the runners polished and ported..

what TB is that ?
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Old 12-23-2011, 11:41 AM
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Re: 93 Prelude H23a1 Valve lash

LMAO yeah i got carried away with that wrinkle paint hu. If I had blue wrinkle i would have just done the valvecover. I got a whole Intake mani off of Egay for $100 Came with fiv,iacv,injs,fuelrail,TB,tps. The seller says it was off a usdm H22a4 but what i had seen in pic was a left side fuel rail? So TB H22A4?
NO PNP, yet. So my intake had to be H22 TB and upper plenum for FIV and iacv 2 wire obd1. F20B has a iacv and fiv combined and 3 wires. runners and iabs are F20b. fuel rail and inj are f20b bcuz where inj ports are shallow and for the most part dont accept H22 inj. H22 inj. fit but not at all are they flush. Now im not sayn u cant put H22 inj. in there would probably have to have em machine a bit deeper. The F20B Plenum and head are factory PNP.(so they say) looks to b.
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Old 12-23-2011, 04:07 PM
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Re: 93 Prelude H23a1 Valve lash

im just hoping that the paint wont act like a blanket and keep the heat in the runners and plenum, instead of letting the heat dissipate. I dont know why they couldnt make it resemble a heat sink, like an amp or something (same goes for the VC). But who knows, with some thermal gaskets, the paint might actually insulate against the heat... which is a big win..
optionally, u could weld metal fins all over the IM and valve cover and make it look like an injector resistor box, lol, fail....
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Old 12-24-2011, 12:29 AM
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Re: 93 Prelude H23a1 Valve lash

uh yeah fins? lmao wow actually thats funny ass **** there. 1 would paint every other fin black then every other fin blue! I had thought about the intake keepn heat in also. maybe just glue resister boxes on my hood!
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Old 12-24-2011, 04:26 PM
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Re: 93 Prelude H23a1 Valve lash

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just glue resister boxes on my hood!
LOL win, but with all the heat that does go on there ,that makes me look at CF in a whole new way
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Old 12-24-2011, 04:47 PM
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Re: 93 Prelude H23a1 Valve lash

all jokes aside u know tho this reminds me of an amp that precision power made that was liquid cooled, i cant remember if it ran off of tapping into engine coolant or if it had its own little rad pumping refrigerant. If u could fashion a water jacket for your intake all the way down to your block, u could actually add a little refrigerated low pressure system to your **** and try to keep it at a low temp, it would have to be sealed as **** tho...
and pack ice bags around your cold air intake
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Old 12-25-2011, 11:16 AM
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Re: 93 Prelude H23a1 Valve lash

I heard about an amp like that awhile back? Best I do for now is a thermo gasket. If u did some kind of refridgerent wouldnt there have to be a pump like on a aircond. unit. Like a pulley. then that pulley would take a horse or 2 away from engine? Mayb run a line from aircondition pump and coil around intake? I do have an extra radiator and an oil filter relocation setup. Its a setup for a turbo or any car/truck that needs extra help cooling down. Im actually going to use it for my 77 silverado 4x4 with a small block 400 6.6ltr.
The 400 runs hot and is a bitch in the summer time.I was just thinking through the cooling down intake isnt there a baro sensor that talks to the ecu? if it runs to cool wount it trip a code? I know our engine need to get up to a certain temp for emissions sensor to kick in. So then im back to rapping a aircond. tube around the cold air intake! lmao

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Old 12-25-2011, 04:07 PM
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Re: 93 Prelude H23a1 Valve lash

lol, that ****s crazy...
props 2 anyone that does it
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