Differences in H series

H22A
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Differences in H series

By -EJ1- COUPE
- Fri May 04, 2007 8:29 pm #7341 USDM H22 open deck block
USDM H23 closed deck block
JDM H22a closed deck block

so i'd say closed deck = boost!! :hehe:
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By teal_dx
- Fri May 04, 2007 8:45 pm #7343 which H was it that has the composite sleeves? I remember reading about it and thinking Boost it! because they are super strong. They also require a certain type of honing. I wanna say it was a specific JDM motor from the 88-91 Ludes :?
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By vtec_gloucester
- Fri May 04, 2007 9:15 pm #7354 might be a n00b question but whats the difference between open and closed deck block??? :?
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By teal_dx
- Fri May 04, 2007 9:31 pm #7357
The following is a fine example of a closed-deck block. The cylinder bore is mated right to the surface of the block which gives it incredible stiffness and resistance to warping or cracking. These engines are created using the "sand-cast" or "lost-foam" methods. Both aren't terribly expensive methods of casting, but they'r emuch less accurate than using the die-cast method. This is why all Subaru engines currently use the die-cast, open-deck design.


closed deck:
Image

open deck:
Image
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By chnzgoofball
- Fri May 04, 2007 11:59 pm #7376
teal_dx wrote:
The following is a fine example of a closed-deck block. The cylinder bore is mated right to the surface of the block which gives it incredible stiffness and resistance to warping or cracking. These engines are created using the "sand-cast" or "lost-foam" methods. Both aren't terribly expensive methods of casting, but they'r emuch less accurate than using the die-cast method. This is why all Subaru engines currently use the die-cast, open-deck design.


closed deck:
Image

open deck:
Image


thanks alot!! :thumb:
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By Greasedmonkey
- Sat May 05, 2007 1:51 am #7381 92-96 h22a from the US prelude vtec had a closed deck design.
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