Evo Big Bore Question
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Cruiser
Joined: Jan 2010
Posts: 142
Likes: 65
Evo Big Bore Question
I have qa 1994 FXSTC with the stock 80 inch Evo. I am looking at a big bore and found the Revolution Performance 100 inch big bore kit.
http://www.ebay.com/itm/REVOLUTION-P...17%26rk%3D1%26
Price seems decent. I see I need the cases bored, but I was just wondering if this is simple bolt on, or do I need new heads, carb, cam, etc., etc. to make it work?
http://www.ebay.com/itm/REVOLUTION-P...17%26rk%3D1%26
Price seems decent. I see I need the cases bored, but I was just wondering if this is simple bolt on, or do I need new heads, carb, cam, etc., etc. to make it work?
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,548
Likes: 7,197
From: Oxford, Nc
I would talk to Scott @ Hillside here on the forum as to how big you can safely bore a set of Evo cases. Stock is 3.498". Most big bores that I'm familiar with are 3.625, (3 5/8".) These 100" kits claim a piston bore of 3.875"?
Sounds like you'd be losing an awful lot of metal, ( and strength.)
Your heads would probably bolt up, but you'd be defeating the purpose leaving them stock, IMO.
I would think you'd be ahead of the game to consider an 89" stroker kit instead.
Sounds like you'd be losing an awful lot of metal, ( and strength.)
Your heads would probably bolt up, but you'd be defeating the purpose leaving them stock, IMO.
I would think you'd be ahead of the game to consider an 89" stroker kit instead.
Last edited by Stiggy; Aug 11, 2012 at 02:49 PM.
Cruiser
Joined: May 2011
Posts: 205
Likes: 1
From: Always moving
I would talk to Scott @ Hillside here on the forum as to how big you can safely bore a set of Evo cases. Stock is 3.498". Most big bores that I'm familiar with are 3.625, (3 5/8".) These 100" kits claim a piston bore of 3.875"?
Sounds like you'd be losing an awful lot of metal, ( and strength.)
Your heads would probably bolt up, but you'd be defeating the purpose leaving them stock, IMO.
I would think you'd be ahead of the game to consider an 89" stroker kit instead.
Sounds like you'd be losing an awful lot of metal, ( and strength.)
Your heads would probably bolt up, but you'd be defeating the purpose leaving them stock, IMO.
I would think you'd be ahead of the game to consider an 89" stroker kit instead.
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,548
Likes: 7,197
From: Oxford, Nc
I see that.
It's the boring of the cases to accept the new, larger cylinders that I'd be concerned with.
It's the boring of the cases to accept the new, larger cylinders that I'd be concerned with.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
I looked into case boring for a big-bore kit a few years ago, before buying my 107" S&S and concluded the only safe way was to replace the cases with aftermarket ones. I haven't come across anyone on HDF who has used one of those kits.
We have several HDF sponsors who tune engines, including Hillside. I suggest contacting them to discuss what you would like to achieve and what is practical.
We have several HDF sponsors who tune engines, including Hillside. I suggest contacting them to discuss what you would like to achieve and what is practical.
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
We've built quite a few 97" Evo's.
3 13/16"(3.8125")bore is where we go.
Combined with even a mild cam, these are formidable powerplants indeed.
Scott
3 13/16"(3.8125")bore is where we go.
Combined with even a mild cam, these are formidable powerplants indeed.
Scott
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Road Master
Joined: May 2007
Posts: 851
Likes: 5
From: Mitchellville, Ia.
I have qa 1994 FXSTC with the stock 80 inch Evo. I am looking at a big bore and found the Revolution Performance 100 inch big bore kit.
http://www.ebay.com/itm/REVOLUTION-P...17%26rk%3D1%26
Price seems decent. I see I need the cases bored, but I was just wondering if this is simple bolt on, or do I need new heads, carb, cam, etc., etc. to make it work?
http://www.ebay.com/itm/REVOLUTION-P...17%26rk%3D1%26
Price seems decent. I see I need the cases bored, but I was just wondering if this is simple bolt on, or do I need new heads, carb, cam, etc., etc. to make it work?
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