H Head/Block combo

[Vtechno]

Head
Are the a1's and a4's basically the same? its just a cam difference correct?
Is there a difference between the quinch areas?

Block

one is open, one is closed. which would you prefer?
im leaning twards the closed deck for strength, but wouldnt a block guard act work? ive heard cooling problems with the block guards.

i guess im going too do another build. i plan on buying it in sections.

[Jarrett]

The A1 and A4 head are exactly the same. The difference come in the header supposedly. As for the block it all all depends on which blocks you're talking about. The block guard is not recommended for a worthwhile build as it can off-center bores and being a different material the heat expansion rates are dissimilar making further issues with trueness inside the engine once it's warmed up.

[Vtechno]

The A1 and A4 head are exactly the same. The difference come in the header supposedly. As for the block it all all depends on which blocks you're talking about. The block guard is not recommended for a worthwhile build as it can off-center bores and being a different material the heat expansion rates are dissimilar making further issues with trueness inside the engine once it's warmed up.

20hp from a header? im not sure thats all of the difference, but im sure its a factor. when installing a block guard, you rehone the cylinders too insure a perfect symmetrical circumference. tonightafter work, im going too look for a high hp prelude or accord with an h22 and see what theyre running.



any other input guys?

[quickangel93]

well it doesnt really matter open or closed deck, both need to be sleeves to safely run 400-700 hp. i know people are going to say that a h22s bottom end is strong, but for how long? no one knows. be save and sleeve

as for the difference between a1 and a4, the heads and cams are the same. only the factory headers are different.

the a6 has a better flow head, bigger intake mani with 8-4 runners, and a more stronger cam. can rev to 7500 safely.

but my question to you is, what are you building for? what would you rather spend 2k for a stock jdm h22 or a fully built usdm f22a6? they make almost the same amount of power. the f22 isnt going to be as good as the h22, unless you got some high compression pistons, a cam, and a port and polish job.

even with that work done, i would invest in a h22 tranny, since the gear ratio is smaller than the f22. it makes the car pull much harder. which torque matters more, cus torque is what drives cars these days.

good luck.

[Jarrett]

well it doesnt really matter open or closed deck, both need to be sleeves to safely run 400-700 hp. i know people are going to say that a h22s bottom end is strong, but for how long? no one knows. be save and sleeve

as for the difference between a1 and a4, the heads and cams are the same. only the factory headers are different.

the a6 has a better flow head, bigger intake mani with 8-4 runners, and a more stronger cam. can rev to 7500 safely.

but my question to you is, what are you building for? what would you rather spend 2k for a stock jdm h22 or a fully built usdm f22a6? they make almost the same amount of power. the f22 isnt going to be as good as the h22, unless you got some high compression pistons, a cam, and a port and polish job.

even with that work done, i would invest in a h22 tranny, since the gear ratio is smaller than the f22. it makes the car pull much harder. which torque matters more, cus torque is what drives cars these days.

good luck.

Wow. I had no clue. I always assumed we only had one head, cam and header for the F22s in question. Normally wouldn't waste my time being a dick but I believe some pretty unhelpful information was given with the torque comment. Torque has always driven cars. Torque is a unit used to measure work. No torque, car no movey.

Back to vtechno's reply, no not 20hp from a header. The F22A4 and F22A1 only differ by 5hp and that difference is made with the header. And if you think it's that fool-proof to install a block guard then go ahead and do it and run it in a high hp application. I know the process for installing one and I realize what needs to be done to install it correctly to make it perfect. The problems arise when you make the engine run and the engine heats up over a period of miles and revs.

[sulimed]

Wow. I had no clue. I always assumed we only had one head, cam and header for the F22s in question. Normally wouldn't waste my time being a dick but I believe some pretty unhelpful information was given with the torque comment. Torque has always driven cars. Torque is a unit used to measure work. No torque, car no movey.

Back to vtechno's reply, no not 20hp from a header. The F22A4 and F22A1 only differ by 5hp and that difference is made with the header. And if you think it's that fool-proof to install a block guard then go ahead and do it and run it in a high hp application. I know the process for installing one and I realize what needs to be done to install it correctly to make it perfect. The problems arise when you make the engine run and the engine heats up over a period of miles and revs.

mostly in the ECU pt3 , p12 , pt6

[foamypirate]

well it doesnt really matter open or closed deck, both need to be sleeves to safely run 400-700 hp.

the a6 has a better flow head, bigger intake mani with 8-4 runners, and a more stronger cam. can rev to 7500 safely.

Stop spouting bullshit.

First of all, a closed deck block can handle a shit ton of power, in part because you don't have to worry as much about the sleeves shifting. Lumping opendeck and closed deck blocks into the same category is fucking blasphemy.

Second, the A1, A4, and A6 all have the same fucking cylinder head. One doesn't flow better than the other. It's the external or cam differences that influence horsepower.

Third, any A1, A4, or A6 can rev to 7500. It's just fucking worthless because you aren't making any power, and at the point longevity starts to go down.


Also, sulimed. The A4 and A1 both run the PT3. The p12 is the prelude F22A1 ECU.

[quickangel93]

Stop spouting bullshit.

First of all, a closed deck block can handle a shit ton of power, in part because you don't have to worry as much about the sleeves shifting. Lumping opendeck and closed deck blocks into the same category is fucking blasphemy.

Second, the A1, A4, and A6 all have the same fucking cylinder head. One doesn't flow better than the other. It's the external or cam differences that influence horsepower.

Third, any A1, A4, or A6 can rev to 7500. It's just fucking worthless because you aren't making any power, and at the point longevity starts to go down.


Also, sulimed. The A4 and A1 both run the PT3. The p12 is the prelude F22A1 ECU.

wow who the fuck ruined your day?

2nd i bought the a6 head for more flow. moron.

and third, if you want to see you a1 or a4 cam shatter to peices, go ahead, rev to 7500-8000. but dont come back crying to me that you now have timing issues.

get the facts straight. and dont take your problems out on me.

[Vtechno]

whoa, whoa, whoa guys....take a breath, lol. take a gander at what i just ordered today......



http://www.hmotorsonline.com/shop/sc...age&item=30016


so n/m the thread question. no one was really responding so i just went ahead and ordered it.


AND i also got he LSD tranny.....

[wed3k]

wow who the fuck ruined your day?

2nd i bought the a6 head for more flow. moron.

and third, if you want to see you a1 or a4 cam shatter to peices, go ahead, rev to 7500-8000. but dont come back crying to me that you now have timing issues.

get the facts straight. and dont take your problems out on me.

you have flow rates on that a6 head vs an a1/a4 head?

[preludeman92]

Did I read this wrong or what? I thought the original post was about h series heads and blocks? It quickly tuned into f22 arguments.

[sulimed]

Did I read this wrong or what? I thought the original post was about h series heads and blocks? It quickly tuned into f22 arguments.

i see what you mean........but this is a 90-93 accord site (f22A1,4,&6). so other than the thread title, you can't tell he talk'n about a H eng.

[wed3k]

Did I read this wrong or what? I thought the original post was about h series heads and blocks? It quickly tuned into f22 arguments.

yea but concluded that a closed deck block are handle more power than a open decked that has not been block guarded.

so we are settling the a4 vs a6 head debate but i dont think we have any flow rates for proof.

[sulimed]

yea but concluded that a closed deck block are handle more power than a open decked that has not been block guarded.

so we are settling the a4 vs a6 head debate but i dont think we have any flow rates for proof.

MOOOOt point

[foamypirate]

and third, if you want to see you a1 or a4 cam shatter to peices, go ahead, rev to 7500-8000. but dont come back crying to me that you now have timing issues.

2nd i bought the a6 head for more flow. moron.

get the facts straight. and dont take your problems out on me.

First of all, the A4, A1, and A6 cam are all MADE of the same material. It's not the cam shattering at 7500-8000 rpm you have to worry about, its the valve float and spinning rod bearings! YOU were the one claiming the A6 could rev to 7500 over the A1/A4. They all have the same rev capability, it's just that the A4/A1 quit making power sooner, due to the more mild cam.

Second, I'm sorry you wasted your money buying an A6 head for more flow...considering it's the same fucking head as an A1/A4.

I'm the one who has the damn facts straight, you are the one spouting false information. If d112crzy was here, he'd kick you in the face.

As a side note, HondaFan81 is revving his red project (or at least, has the capability to do so, easily) to 7500rpm. On a delta regrind. What's a delta regrind? Oh yeah, a stock cam with metal added and reshaped! Durr.