Type S engine differences..More than you think!

703 Views 7 Replies 4 Participants Last post by 71dsp, Apr 2, 2001

andrewdelvard

Discussion Starter · Mar 31, 2001

This came to my attention a few days ago, so I thought I'd share it with you gentlemen.
The Valve-Angle-Geometry is different as well!
Instead of 60 degrees as on the *regular* H22A, THE Type S engine is set at 45 degrees.
The only thing is...I don't really know what this means! What do you think?

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cantdrive55

· #2 · Apr 1, 2001

hmm, that is interesting to hear, although I'm not sure exactly what that would mean performance wise either...

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Got VTEC? I don't.
92 Prelude Si BONE stock
**[email protected] at LACR so 15.5 at Pomona**

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andrewdelvard

Discussion Starter · #3 · Apr 1, 2001

Now I thought this was interesting!
But just one reply from cantdrive55?

Lets try one more time...

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ahcjar103

· #4 · Apr 1, 2001

I think it allows more stuff to go in or out of the chambers...I'm not sure though

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· #5 · Apr 1, 2001

<font face="Verdana, Arial" size="2">Originally posted by andrewdelvard:
This came to my attention a few days ago, so I thought I'd share it with you gentlemen.
The Valve-Angle-Geometry is different as well!
Instead of 60 degrees as on the *regular* H22A, THE Type S engine is set at 45 degrees.
The only thing is...I don't really know what this means! What do you think?</font>

From the Type S literature I have read, it's a difference in the valve seat angle. No big deal really. Someone said it was the angle of the valve relative to the horizontal, but I can't see how this would happen with Honda keeping the same combustion chamber volume. A 45 degree angle would cause the combustion chamber to be more pent roof shaped, which would increase the volume.

Anyway, I think it's just the valve seat angle. I can't verify without looking at a Type S head right here in front of me.

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Billy
North Texas Prelude Owners Group
www.ntpog.org

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JinMTVT

· #6 · Apr 1, 2001

I used to thought that it was the real angle to horizontal when i first read translation of type S site..

but then you 71dsp and few other told me that it was only the seat angle..

but i've check recently..
and the head from the Type S is completly different from the SIR in japan..

don't know why, the header is diff, but then again could be cause the ATTS tranny or something cause we have the same thing with the SH ... mmm

would have to import a head from japan to see whan it relaly is

71dsp, i know u've got euro R int. manif..

u did some research on the Euro R head, cams and other stuff we could use ?

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· #7 · Apr 2, 2001

Nope, just imported the head. Getting that information is really difficult. We didn't even know if the damn thing would bolt up!

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Billy
North Texas Prelude Owners Group
www.ntpog.org

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· #8 · Apr 2, 2001

<font face="Verdana, Arial" size="2">Originally posted by JinMTVT:
but i've check recently..
and the head from the Type S is completly different from the SIR in japan..
</font>

How did you check it? Part numbers? If you just checked part numbers, OF COURSE they will be different! The Type S head is "polished" like the other Type R heads, so the part number has to be different.

How do you know that it is different than the SiR head other than part numbers?

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Billy
North Texas Prelude Owners Group
www.ntpog.org

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