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 Post subject: Re: Advice on 72 h1b
PostPosted: Mon Nov 20, 2017 9:04 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
H2R, Thanks for the reply,
I'm lucky I found the H1, an H2 would be near impossible. Put it this way, there is not 1 traffic light in the entire 2300 sq mile county I live in and the cloesest McDonalds is a 150 mile trip. Finding a can of can of Chicken soup around here is hard enough. :( unless you have a h2 you want to trade for my h1? Don't think I can offer enough big Mac's and fries to sweeten the deal either. :lol: JK!!


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 Post subject: Re: Advice on 72 h1b
PostPosted: Mon Nov 20, 2017 9:09 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
Jim wrote:
I didn't say deck heads, I said squish heads. You're not going for high compression, but rather a good squish band.

Yes, agreed that an H2 engine makes more sense if you're trying to keep up with modern bikes. With some good porting, big carbs, and other common sense improvements it's not terribly hard to get well into the 80 rwhp range. Optionally reeds will give it 4-stroke-like bottom end grunt.

Use the resource site to find machine shops known for doing good work on triple engines.


Thanks Jim,
Can you define squish heads/squish band? :thumbup:


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 Post subject: Re: Advice on 72 h1b
PostPosted: Mon Nov 20, 2017 9:49 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
I could give you my interpretation, but you'd be better off reading either the Jennings or Bell tuning books that are on the resource site. The squish band sections are not long or particularly complicated, and are very worth reading. You'll certainly find a lot of other relevant information for your project in either of those books too.

The quick and dirty answer is the squish band is a region where the piston comes close to the head, keeping the mixture cool and delaying combustion in that area, and preventing detonation. But a lot more is going on than that.

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If it surges, that's normal, upshift.


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 Post subject: Re: Advice on 72 h1b
PostPosted: Mon Nov 20, 2017 10:46 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
Jim wrote:
I could give you my interpretation, but you'd be better off reading either the Jennings or Bell tuning books that are on the resource site. The squish band sections are not long or particularly complicated, and are very worth reading. You'll certainly find a lot of other relevant information for your project in either of those books too.

The quick and dirty answer is the squish band is a region where the piston comes close to the head, keeping the mixture cool and delaying combustion in that area, and preventing detonation. But a lot more is going on than that.


Ok will check it out. Thanks!
Sounds like I'm probably just better off to rebuild and leave as is, put a set of pipes on it, call it done for now.


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 Post subject: Re: Advice on 72 h1b
PostPosted: Mon Nov 20, 2017 11:20 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
That's not a bad plan at all, just don't get in any races with anything faster than an FZ-07.

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If it surges, that's normal, upshift.


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 Post subject: Re: Advice on 72 h1b
PostPosted: Tue Nov 21, 2017 4:19 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
Jim-
I could not seem locate the Jennings or bell tuning books on the resource site, can you send me a link?


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 Post subject: Re: Advice on 72 h1b
PostPosted: Tue Nov 21, 2017 4:54 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
It's under "manuals", then "additional manual listings". Jennings is obvious, but the Bell book seems to be called "performance tuning".

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If it surges, that's normal, upshift.


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 Post subject: Re: Advice on 72 h1b
PostPosted: Tue Nov 21, 2017 7:39 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
Thanks! Will check.


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 Post subject: Re: Advice on 72 h1b
PostPosted: Tue Nov 21, 2017 7:46 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
Jim wrote:
That's not a bad plan at all, just don't get in any races with anything faster than an FZ-07.


No worries, only thing I have to contend with around here is a Harley for the most part. Seen a old school cb550 once, not to long ago. Mostly Harley's tho...... :?


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 Post subject: Re: Advice on 72 h1b
PostPosted: Sat Nov 25, 2017 3:06 pm 

Joined: Sun Jan 15, 2017 7:00 am
Posts: 94
Location: NORAD Colorado
As I'm tearing into this engine I'm noticing Tell tail signs that someone has been in this engine before. Although I know it's been sitting a while, prior to it going in the barn, someone did some internal work of some sort. Also the top end is clean as hell, heads are almost flawless, no lip in the top of the cylinder, next to no carbon on top of pistons, can still see cross hatches on cylinder walls. Still gonna tear it all down to change seals, check bearings, etc. will post pics, just remembered it kind of a round about way of doing so, instead of uploading directly from my phone.


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