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  #31  
Old 10th August 2018
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  #32  
Old 10th August 2018
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A little update:
I just did a little research and the info I found is as such (corrections welcome)
Chevy 350 has a 4 inch bore
Late 70's Ironhead 1000 has a stock stroke of 3.8 inch and a bore of 3.2 inch
I went onto a displacement calculator and it came out to about 1550 CCs.
I don't know how far an ironhead 1000 can be bored out but I would be very surprised it it can be bored nearly a full inch.
As for a 1550cc Sporty, even if there were aftermarket cylinders to support this I think it would have been talked about before now.
So I find it very doubtful that my buddy is putting Chevy 350 Pistons in his bike.
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  #33  
Old 10th August 2018
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Originally Posted by jimmyess333 View Post
As for a 1550cc Sporty, even if there were aftermarket cylinders to support this I think it would have been talked about before now.
It's talked about regularly and there are aftermarket cylinders that support big bores on ironheads.

The main thing to help you educate yourself is that it's relatively rare to find an ironhead person speaking in metric terms -- so no, you won't find people talking about 1500cc ironheads; but if you change your search parameters you will find them talking about 74, 84, and 92 cubic inch ironheads -- almost always with the term "stroker."

1500cc = about 90 cubic inches.

Here's one example:
http://xlforum.net/forums/showthread.php?t=1208660

And, here's a current build:
http://xlforum.net/forums/showthread.php?t=2005894

The builder in the current example is aiming at a 3-7/16 bore by 5 inch stroke. This equals 92 cubic inches or 1520 cc.

But, no, they don't use Chevy 350 pistons on these builds.

Long story short, if you can dream it; someone's probably tried it.

Whether they've announced it on-line is a different matter. Some of the best stuff out there has never made it to the internet.
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  #34  
Old 11th August 2018
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Quote:
Originally Posted by Chuckthebeatertruck View Post
It's talked about regularly and there are aftermarket cylinders that support big bores on ironheads.

The main thing to help you educate yourself is that it's relatively rare to find an ironhead person speaking in metric terms -- so no, you won't find people talking about 1500cc ironheads; but if you change your search parameters you will find them talking about 74, 84, and 92 cubic inch ironheads -- almost always with the term "stroker."

1500cc = about 90 cubic inches.

Here's one example:
http://xlforum.net/forums/showthread.php?t=1208660

And, here's a current build:
http://xlforum.net/forums/showthread.php?t=2005894

The builder in the current example is aiming at a 3-7/16 bore by 5 inch stroke. This equals 92 cubic inches or 1520 cc.

But, no, they don't use Chevy 350 pistons on these builds.

Long story short, if you can dream it; someone's probably tried it.

Whether they've announced it on-line is a different matter. Some of the best stuff out there has never made it to the internet.
Can you bore a stock cyl out to to accommodate a 4 inch piston?
That's what this guy is claiming to have done.
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  #35  
Old 11th August 2018
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Originally Posted by jimmyess333 View Post
Can you bore a stock cyl out to to accommodate a 4 inch piston?
That's what this guy is claiming to have done.
Maybe...... the Zippers big bore 88 inch cylinder kits are 3 13/16 bore. Probably can't bore a stock cylinder that big.

There is a warning on the Zippers kit that says 3 13/16 is the largest bore the cases can safely stand.
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  #36  
Old 11th August 2018
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How about those shovester???
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  #37  
Old 11th August 2018
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Thanks guys. This friend of mine does tell some tales. I don't want to call him out, I just want to know for myself. Sometimes I let him go because I want to hear how far the story will go.
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  #38  
Old 11th August 2018
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You can't do a 4" bore on an Ironhead unless you weld the lifter holders into the case when you add the needed material to that side of the case spigot.

Don't know how long that would last though. A lot of welding and machine work. Then you still have to work the heads, moving the bolt pattern out and what not.

Ideally the way to do that would be to make a case with the cam and lifter bores offset to accommodate the huge bore.
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  #39  
Old 11th August 2018
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Quote:
Originally Posted by ryder rick View Post
You can't do a 4" bore on an Ironhead unless you weld the lifter holders into the case when you add the needed material to that side of the case spigot.

Don't know how long that would last though. A lot of welding and machine work. Then you still have to work the heads, moving the bolt pattern out and what not.

Ideally the way to do that would be to make a case with the cam and lifter bores offset to accommodate the huge bore.

They don't call me Ironhead Rick just because I'm hard headed
That would be with aftermarket cylinders, right?
Can the OEM cylinder go to 4 inches?
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  #40  
Old 12th August 2018
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hehehehehaw!

well, you could make a cross-head cylinder arrangement, lot of old engines were like that, been around a few. even honda designed a prototype.
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