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head difference from base to sh and type s

 
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Old 10-02-2011, 09:59 PM
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head difference from base to sh and type s

i was going to buy a 99 sh with a blown motor. im having a hard look at it tomorrow. all i know is it blew at highway speed at 190000km or 100000 miles. im thinking t belt or possibly balance shaft seal or water pump. the latter two indicate bottom end disaster and no interest to repair. if it was a t belt then i have a few options. repair the valves and put a new belt back on, or swap a head back into it. i know the sh and base motors are not interchangeable due to atts and other issues but what about just the head? ive seen rebuilt h22 heads for only a few hundred. having said all that, will a type s head or other jdm head also bolt right in? thanks all
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Old 10-02-2011, 11:05 PM
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Re: head difference from base to sh and type s

The head should just bolt right up since only the block differs.

But wait for someone else to confirm this.
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Old 10-02-2011, 11:17 PM
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Re: head difference from base to sh and type s

thanks. ive searched a bunch and it seems there is a very minor difference in the cams from the base to sh but then a big jump to type s cams. as far as i know, most of the extra 20 hp of a type s is from the head and intake box. these are mechanical differences and as far as i know should not interfere with the ecu or emissions system. just need a confirmation. thanks again
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Old 10-03-2011, 01:03 AM
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Re: head difference from base to sh and type s

SH and Base motors are the same h22a4?

The only difference is the transmission with ATTS and the suspension components? I guess I could be wrong, but that was my understanding.
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Old 10-03-2011, 01:43 AM
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Re: head difference from base to sh and type s

They are both H22a4's - yes

the only difference is tranny and suspension. along with the location of the oil filter etc on the block because of the atts location.

Technically an SH can be converted to a base by removing the atts so i see no reason the head should not work.

So the head SHOULD fit without any issue. but I'm not saying i'm positive because i have no experience with this, i'm going by what i've read and learned in the past.
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Old 10-03-2011, 01:51 AM
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Re: head difference from base to sh and type s

Ahh, I see. I have a 4G, so that's not required knowledge for me
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Old 10-03-2011, 09:42 AM
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Re: head difference from base to sh and type s

The SH Prelude got a enhanced cam and suitable springs that has more intake lift then a base Prelude and more exhaust lift then the cam on a JDM type S that is designed to work with the USDM engines 10 to 1 compression pistons.Because the Type S Prelude used 11 to 1 compression pistons, its cam profile would not be optimized if one was to use The Type S head on a 10 to 1 compression, USDM engine.You usually run into unpredictable problems when ever you start doing Frankenstein mods on a car.Just try to find a SH head, and keep the engine in its Honda optimized , stock form

Source : 1999 OEM Honda tech manual


Last edited by SHDRIVER; 10-03-2011 at 09:53 AM.
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Old 10-03-2011, 11:37 AM
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Re: head difference from base to sh and type s

SH cams < Type S cams


Artie, just because of the mild and not even noticeable difference in cam lobe on the SH and base - does NOT affect anything when it comes to swapping heads.
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Old 10-03-2011, 12:30 PM
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Re: head difference from base to sh and type s

Quote:
Originally Posted by SHDRIVER View Post
The SH Prelude got a enhanced cam and suitable springs that has more intake lift then a base Prelude and more exhaust lift then the cam on a JDM type S that is designed to work with the USDM engines 10 to 1 compression pistons.Because the Type S Prelude used 11 to 1 compression pistons, its cam profile would not be optimized if one was to use The Type S head on a 10 to 1 compression, USDM engine.You usually run into unpredictable problems when ever you start doing Frankenstein mods on a car.Just try to find a SH head, and keep the engine in its Honda optimized , stock form


Quote:
Originally Posted by wing8806 View Post
SH cams < Type S cams


Artie, just because of the mild and not even noticeable difference in cam lobe on the SH and base - does NOT affect anything when it comes to swapping heads.
Both of you are correct.

Also to the posters above, it's not just the filter location, the exhaust on the SH is longer to accommodate the transmission/atts unit, also with a few other things that differ.

The heads will work fine together, it's the same bottom end. I do have a few questions for you though...

You did mention the bottom end is fcked up, are you planning on swapping motors base to SH? Reason I ask is because a head swap involves minimal work compared to swapping a SH motor into a base. A lot of extra work for a full swap. You are talking extra coolant and electrical lines, it is a hard swap for sure.

A head swap is easy (at least in comparison), the cam duration change is minimal, and if you were to order a new cam from honda they give you the same part #, same cam. There is a difference between the 2, but it isn't enough to make it run like chit or anything. Just make sure that whichever head you use, you go by the timing for that model (if SH head, SH timing - base head, base timing - just to ensure you don't run into any problems. I'm not sure the timing is even different, I've never owned a 5th gen so it was never a problem)

The type S head will fit also. That one has higher cam duration than both. Which is fine, but again you have to go by the timing on the type S, not the base model. By doing this, you are setting the timing to hit on spot with the cam durations for intake and exhaust.

If you are doing this, make sure you know what you are doing. If a mechanic is doing this, make sure you take it to someone who knows hondas or knows their chit pretty well...
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Last edited by Smok3y; 10-03-2011 at 12:32 PM.
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Old 10-03-2011, 05:39 PM
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Re: head difference from base to sh and type s

You can put a Base head on an SH block. If it was just a blown timing belt then you can also take the cams out of the SH head and put them into the base head then it will be literally the same as an SH head.

Quote:
Originally Posted by wing8806 View Post
Technically an SH can be converted to a base by removing the atts.
This is somewhat true but you would also need the base transmission and there is also a bracket missing on the SH block where the ATTS unit is so you would have to have a custom made bracket put on the SH block if you wanted to use the SH block without ATTS (or convert it into a base as wing said). You may have already known this wing, but I wanted to stop people who don't know much about cars from just taking out the ATTS unit and thinking everything will work.
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Last edited by keeganhmorgan; 10-03-2011 at 05:43 PM.
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Old 10-03-2011, 07:30 PM
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Re: head difference from base to sh and type s

thanks a ton guys. some great info.
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