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PostPosted: Thu Jan 12, 2012 4:17 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
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Location: North Central NC
two-stroke-brit wrote:
Jim wrote:
Zambia wrote:
Pistons for the high transfer cut-outs are....rocking horse poop.

I'm not sure what you mean, Z.


that would be "very rare" jim

Thanks. I was thinking pistons rocking in the bore, horse poop... overthinking. :lol:

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PostPosted: Thu Jan 12, 2012 6:33 pm 
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Joined: Wed Jun 08, 2011 10:04 pm
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Location: Nottingham U.K. / Traverse City Mi
Ja-Moo wrote:
Gerrit wrote:
RB, "early cylinders are not portable to later specs" makes sense as adding material to the cast iron liner would be a bit difficult, but can series 2 cylinders be modified to 1st series specs? Has anybody actually tried this? A quick look suggests that it can be done, but I'll have to make accurate measurements to see if the transfer cutaway can actually be modded without causing problems.


I mod the cut-outs all the time, not a big deal.


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:o
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REALLY ? . . . Just cutting the liners REALLY won't do the trick :roll:
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I'll let this post run a while and let the experts tell me why it can't be done
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Actually, I am in jet-lagged "snitty" mode - as I am not an engineer, please tell me how a liner that is a totally different PLACE in the alloy casting to all other models can be ported to the same spec as the earlier models :eh: some ports need lowering and others need raising (as far as I remember . . the again Alsheimers DOES run the the family ;) ) So you either cut iron or weld alloy :think: And it REALLY isn't worth that effort, I have done the Dyno rolling road tests and the final output is the same . . . It's just the WAY that the power is delivered that makes the difference - - - add a few more BHP with a good port job and you will be just as well off :thumbup:

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PostPosted: Thu Jan 12, 2012 9:26 pm 
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Location: Rio Rancho, New Mexico
R.B. wrote:
Has anybody actually tried this? A quick look suggests that it can be done, but I'll have to make accurate measurements to see if the transfer cutaway can actually be modded without causing problems.


I mod the cut-outs all the time, not a big deal.[/quote]

.
:o
.
REALLY ? . . . Just cutting the liners REALLY won't do the trick :roll:
.
.
I'll let this post run a while and let the experts tell me why it can't be done
.
.
Actually, I am in jet-lagged "snitty" mode - as I am not an engineer, please tell me how a liner that is a totally different PLACE in the alloy casting to all other models can be ported to the same spec as the earlier models :eh: some ports need lowering and others need raising (as far as I remember . . the again Alsheimers DOES run the the family ;) ) So you either cut iron or weld alloy :think: And it REALLY isn't worth that effort, I have done the Dyno rolling road tests and the final output is the same . . . It's just the WAY that the power is delivered that makes the difference - - - add a few more BHP with a good port job and you will be just as well off :thumbup:
[/quote]


I was just talking about the transfer cut aways. The later "short" cut outs are easily modded to earlier cut out spec. It is actually not super important, as it's really the piston that controls the transfer flow.

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PostPosted: Thu Jan 12, 2012 10:29 pm 
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Joined: Thu Jun 09, 2011 12:10 am
Posts: 280
Location: Cane Ridge (Nashville), TN
I just wanted to trade one or two cylinders with someone. :roll:

John


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PostPosted: Thu Jan 12, 2012 10:44 pm 
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Location: Milang, South Australia
Well, I hope you find some cylinders - but you have provided lively debate, always good on a forum like this! :lol:

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PostPosted: Fri Jan 13, 2012 9:31 am 

Joined: Fri Aug 19, 2011 3:15 am
Posts: 224
Location: Kingdom of the Netherlands
JA, I think RB is referring to modifying the H2-B/C cylinders to the early specs, while I was referring to the later H2/-A cylinders. For the latter, only the transfer cutaway has to be modified (as far as I know) to obtain the early specs, but for the H2-B/C cylinders the intake and exhaust ports are somewhat different (though timing isn't) and these have to be modified as well. The changes to B/C cylinders were to cut down mechanical noise.


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PostPosted: Fri Jan 13, 2012 10:25 am 
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Location: North Central NC
Gerrit wrote:
...while I was referring to the later H2/-A cylinders. For the latter, only the transfer cutaway has to be modified (as far as I know) to obtain the early specs...

Exactly! Hooktool says he has two 2nd generation cylinders (late H2 and H2A) and a first generation cylinder. I would think it would be easier to modify the transfer cutaways than to properly pack cylinders for shipping.

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PostPosted: Fri Jan 13, 2012 11:27 am 
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Location: Cane Ridge (Nashville), TN
I could easily cut away the transfer, but I thought there is a difference in the ports as well. No? The drawing is not clear to me on this. I'll bring them into the shop and measure them, I guess.
:)

John


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PostPosted: Sun Jan 15, 2012 11:35 am 
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Location: Cane Ridge (Nashville), TN
Iron, You sent me a PM, but there was no message in it. :)

John


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PostPosted: Sun Jan 15, 2012 7:19 pm 
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Location: South Louisiana
I'm sorry. I was typing with invisable ink again.

See your inbox.

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