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 Post subject: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 10:27 am 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 97
Location: Chazy New York
I'd like to build a spare H2 engine and have two sets of cylinders on hand to choose from. One set came off a '72 engine (H2E 16582) and the othe set a '73 (H2E 27256). I've been to the resource site and looked at the photo ID section for H2 cylinders. It appears that the cut-outs match those from the H2A for both sets.

Image

Image

The cylnder on the left came off the '73 motor. some other info. The '73 had 1/2mm overbore pistons and the '72 set has 1mm overbore. Is it feasible or practical to go to another overbore on the '72 set. Thanks for your advise on this one.

Jim


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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 10:44 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 4556
Location: North Central NC
I'm currently running 2mm over, or 4th overbore on my early '72 H2. That makes it a 790cc H2. When I go to 5th over, I'll finally have an 800cc H2. :lol:

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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 11:23 am 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 97
Location: Chazy New York
Jim wrote:
I'm currently running 2mm over, or 4th overbore on my early '72 H2. That makes it a 790cc H2. When I go to 5th over, I'll finally have an 800cc H2. :lol:


Jim, do both Wiseco and Wossner make the overbore that your running? Any idea why those sleeves look different?


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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 11:29 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 4556
Location: North Central NC
I'm not a sleeve expert, so I don't want to guess about the differences. Last time I bought Wisecos, they were available at least to 4th over, but that was 30+ years ago. After having both brands, I prefer Wossners, and they're available to 5th over.

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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 12:07 pm 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 97
Location: Chazy New York
Jim wrote:
I'm not a sleeve expert, so I don't want to guess about the differences. Last time I bought Wisecos, they were available at least to 4th over, but that was 30+ years ago. After having both brands, I prefer Wossners, and they're available to 5th over.


Great, thanks. After closer observation, it appears to me that someone did some cleanup on the '73 jugs. Just not sure if it would affect next overbore.


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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 7:22 pm 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 2236
Location: Adelaide, South Australia
Yep, Someone has given the set on the left a bit of a clean-up - did you check for any difference in exhaust-port height, for instance?

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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 8:37 pm 

Joined: Tue Jun 14, 2011 5:05 pm
Posts: 97
Location: Chazy New York
RODH2 wrote:
Yep, Someone has given the set on the left a bit of a clean-up - did you check for any difference in exhaust-port height, for instance?


It looks the same as the other one but I haven't checked for sure. Do you see any problems with another overbore from what was done? The other two look the same.


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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 10:09 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 6554
Location: Rio Rancho, New Mexico
Must be the pic angle, the left cylinder liner sure looks thin, like it was .060 or .080 over.

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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 10:25 pm 

Joined: Thu Jun 09, 2011 2:00 am
Posts: 953
Location: Southern Ontario, Canada
The liner has been "knife edged" like the transfer dividers....

J


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 Post subject: Re: H2 Cylinder ID
PostPosted: Mon Feb 18, 2013 10:39 pm 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 2236
Location: Adelaide, South Australia
Yes, they have been hand finished, tho thin edges don't really achieve much. I am on .080" for the engine I am building now, I have heard of them going out to .100" w/o any ill effect.

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