Bore and stroke
Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
Likes: 1,476
From: Texas! Ya mean there's someplace else?
RE: Bore and stroke
He'd have to have big bore cylinders. I don't remember there being enough meat on the stock cylinders to bore it to 1200.
I had my '72 CH stroked to 77 inches. It was bored .010 over to clean it up. I've seen 89 inch stroker Ironheads, but they were maintenance monsters on the street. Also remember one Ironhead that was over 100 inches, both stroked and with big bore cylinders. It had the tranny section milled off and was coupled to a Norton tranny, IIRC.
Check with S&S, and also with Sputhe, and maybe Atlas. They might be able to clue you in on something. Remember that the stroker engine usually won't "live" as long as one that has big bore cylinders to achieve the same displacement. The longer stroke means higher piston speeds and that means more wear. But boy are they fun when that baby's torque hammers you!
I had my '72 CH stroked to 77 inches. It was bored .010 over to clean it up. I've seen 89 inch stroker Ironheads, but they were maintenance monsters on the street. Also remember one Ironhead that was over 100 inches, both stroked and with big bore cylinders. It had the tranny section milled off and was coupled to a Norton tranny, IIRC.
Check with S&S, and also with Sputhe, and maybe Atlas. They might be able to clue you in on something. Remember that the stroker engine usually won't "live" as long as one that has big bore cylinders to achieve the same displacement. The longer stroke means higher piston speeds and that means more wear. But boy are they fun when that baby's torque hammers you!
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Elite HDF Member
Joined: Mar 2005
Posts: 4,092
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From: St. Petersburg Florida
RE: Bore and stroke
I was just curious as to what could be done to these engines and how far. The power to weight ratio of a sporty with a 100 CI motor must be awesome.
Seasoned HDF Member
Joined: Sep 2004
Posts: 6,197
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From: (Toronto) Canada
RE: Bore and stroke
A rip down of an engine is easy, and a simple bore, high compression pistons, polished heads, cams, breather and exhaust can be done with the engine still in the bike. A stroker requires removal, bottom end rip apart, stacks, short pistons, and the list goes on. I would never do a stroker unless the bike was a complete rebuild. The engine life is less, the work is way more and the cost is crazy. My opinion only.
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Elite HDF Member
Joined: Mar 2005
Posts: 4,092
Likes: 1
From: St. Petersburg Florida
RE: Bore and stroke
So, the biggest bore kit I have seen so far will bring displacement up to 1200. Are there any bigger?
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Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
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From: Texas! Ya mean there's someplace else?
RE: Bore and stroke
ORIGINAL: SKJOLD
So, the biggest bore kit I have seen so far will bring displacement up to 1200. Are there any bigger?
So, the biggest bore kit I have seen so far will bring displacement up to 1200. Are there any bigger?
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