h22a1 and h22a4

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tjr5150

Junior Member
i'm just wondering what the differnce is between the h22a1 and h22a4 it would be going into a 90 accord any advice would be helpful....thanks in advance
 
Originally posted by UDT@Oct 26 2004, 10:33 PM
I believe ones open deck and the other closed not sure witch though.
[post=407923]Quoted post[/post]​


That and the h22a4 has some internally differant parts, its built to obd2 spec(oil pump) for example. Type SH has atts...
 
the h22a1 is usdm obd1 motor with closed deck...

the h22a4 is the second generation of the usdm motor and it has an open deck...

maybe slight alterations with the internals resulting in perhaps a 5 hp increase in the a4 over the a1...
 
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