90+ hp/tq build
Club Member
Joined: Aug 2008
Posts: 22,861
Likes: 17,917
From: Lafayette, Louisiana
I can't help but notice this in your signature:
96 RD King
M and M efi
EV 27 cam
2 into 1 with thunder header slip on
High flow intake
Big axle lifters
Crane adjustable pushrods
To me, that doesn't seem like a bad platform to build from. The EV27 can benefit from increased compression because it, and even more aggressive cams, lower the actual cranking pressure, so by milling the heads or changing to higher compression pistons, you are putting back what was lost, and ideally, a little more.
I would start by milling the heads. If your cylinders are scarred, maybe slightly boring them out or at least honing them and fresh set of rings. Take careful measurements and use that to base your gasket selection off of to set the squish. It is details like this that make the difference between a good build and a great build. Scrap the EFI in favor of a Mikuni carburetor. The Mikuni may be slightly more complex and a bit harder to tune than S & S, but with patience, can be dialed in more precisely. It seems like this would be a very affordable way to get the most out of what you already have. Your current setup is not maximizing it's full potential. The dyno numbers be damned! The only dyno that matters is felt by the seat of the pants, called the butt dyno. The only curve in that equation that really matters is curve formed by the grin extending from the left side of your mouth to the right side. In this case, if that curve is flat, then more work would be necessary.
Once your engine is set up right, then look at tooth count on sprockets. Do not start messing with gearing or tooth counts until you have everything like you want it with the engine.
It's very easy to throw a lot of money at the problem and still have the problem.
96 RD King
M and M efi
EV 27 cam
2 into 1 with thunder header slip on
High flow intake
Big axle lifters
Crane adjustable pushrods
To me, that doesn't seem like a bad platform to build from. The EV27 can benefit from increased compression because it, and even more aggressive cams, lower the actual cranking pressure, so by milling the heads or changing to higher compression pistons, you are putting back what was lost, and ideally, a little more.
I would start by milling the heads. If your cylinders are scarred, maybe slightly boring them out or at least honing them and fresh set of rings. Take careful measurements and use that to base your gasket selection off of to set the squish. It is details like this that make the difference between a good build and a great build. Scrap the EFI in favor of a Mikuni carburetor. The Mikuni may be slightly more complex and a bit harder to tune than S & S, but with patience, can be dialed in more precisely. It seems like this would be a very affordable way to get the most out of what you already have. Your current setup is not maximizing it's full potential. The dyno numbers be damned! The only dyno that matters is felt by the seat of the pants, called the butt dyno. The only curve in that equation that really matters is curve formed by the grin extending from the left side of your mouth to the right side. In this case, if that curve is flat, then more work would be necessary.
Once your engine is set up right, then look at tooth count on sprockets. Do not start messing with gearing or tooth counts until you have everything like you want it with the engine.
It's very easy to throw a lot of money at the problem and still have the problem.
Last edited by Prot; Oct 27, 2013 at 03:23 PM.
Thread Starter
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Advanced
Joined: Jul 2012
Posts: 95
Likes: 1
From: Lincoln ne
I'm looking at either the w6h or the w8 for a can. I'm favouring the 6h because it comes in a bit sooner and carries strong to 4750-5000 rpm range like the w8. I talked to bob wood today and ill be talking to Kevin sanger tomorrow about the components I'm looking at. Bob says I'm on the right track.
The reason Im not going with the ev27 is because its not going to get me where I want/need to be. Yes it'll work but not to the extreme I want.
I'm a little confused on the squish area. That's the space between your piston at tdc and the deck of the head or the top of the compression dome?
I don't want to shave my heads because that's perminant. I can go with the cometic. .030 head gasket and have the same result. I am going .010 over in the cylinders though. There's been no gouging but I want a touch bigger. I'm looking at Keith black flat top pistons at a 9.6:1cr. They offer a 10.1:1 but I think that will put me over my goal of 10.25:1.
A thunder header will be the final in this mess of things. The slip ons will have to do for now though. Doing this build paycheck to paycheck on top of all other things! Hahaha!!
Oh and the mikuni hsr will be the carb with the dyna 2000i single fire to light it off. Doing away with the efi.
The reason Im not going with the ev27 is because its not going to get me where I want/need to be. Yes it'll work but not to the extreme I want.
I'm a little confused on the squish area. That's the space between your piston at tdc and the deck of the head or the top of the compression dome?
I don't want to shave my heads because that's perminant. I can go with the cometic. .030 head gasket and have the same result. I am going .010 over in the cylinders though. There's been no gouging but I want a touch bigger. I'm looking at Keith black flat top pistons at a 9.6:1cr. They offer a 10.1:1 but I think that will put me over my goal of 10.25:1.
A thunder header will be the final in this mess of things. The slip ons will have to do for now though. Doing this build paycheck to paycheck on top of all other things! Hahaha!!
Oh and the mikuni hsr will be the carb with the dyna 2000i single fire to light it off. Doing away with the efi.
Road Captain
Joined: Sep 2012
Posts: 675
Likes: 32
From: Massachusetts
I'm looking at either the w6h or the w8 for a can. I'm favouring the 6h because it comes in a bit sooner and carries strong to 4750-5000 rpm range like the w8. I talked to bob wood today and ill be talking to Kevin sanger tomorrow about the components I'm looking at. Bob says I'm on the right track.
The reason Im not going with the ev27 is because its not going to get me where I want/need to be. Yes it'll work but not to the extreme I want.
I'm a little confused on the squish area. That's the space between your piston at tdc and the deck of the head or the top of the compression dome?
I don't want to shave my heads because that's perminant. I can go with the cometic. .030 head gasket and have the same result. I am going .010 over in the cylinders though. There's been no gouging but I want a touch bigger. I'm looking at Keith black flat top pistons at a 9.6:1cr. They offer a 10.1:1 but I think that will put me over my goal of 10.25:1.
A thunder header will be the final in this mess of things. The slip ons will have to do for now though. Doing this build paycheck to paycheck on top of all other things! Hahaha!!
Oh and the mikuni hsr will be the carb with the dyna 2000i single fire to light it off. Doing away with the efi.
The reason Im not going with the ev27 is because its not going to get me where I want/need to be. Yes it'll work but not to the extreme I want.
I'm a little confused on the squish area. That's the space between your piston at tdc and the deck of the head or the top of the compression dome?
I don't want to shave my heads because that's perminant. I can go with the cometic. .030 head gasket and have the same result. I am going .010 over in the cylinders though. There's been no gouging but I want a touch bigger. I'm looking at Keith black flat top pistons at a 9.6:1cr. They offer a 10.1:1 but I think that will put me over my goal of 10.25:1.
A thunder header will be the final in this mess of things. The slip ons will have to do for now though. Doing this build paycheck to paycheck on top of all other things! Hahaha!!
Oh and the mikuni hsr will be the carb with the dyna 2000i single fire to light it off. Doing away with the efi.
I had a W8. 97bagger has it now lol
it's a BEAST of a cam...for a lighter bike IMHO. it pulled like a freight train, but was a *dog* under 3000rpm, even @ 10.3:1 CR
for reference, wiseco 10:1's w/ a .030" cometic HG will put you right at 10.1-10.2:2 CR. i was a touch higher because I decked the cylinders a touch to set deck height.
you'll like the 6H if you go that route. you really won't get the full effect without some port massaging (the head work really helps air flow with the .590" lift), but it certainly won't be a slouch.
personal opinion: look @ the Dyna 2000P too. same ignition, but separate module vs. the setup that goes in the nosecone. I know a ton of people have NO issues with them, but it weirds me out to have electronics in a closed off high-heat area that really sees no ventilation whatsoever.
Road Captain
Joined: Mar 2006
Posts: 579
Likes: 26
From: Virginia
Sounds like my build. 10:1 wisecos, woods 6, dyna 2000i, thunder header. I should be getting the parts before this weekend. I want street torque, not having to wait until 3000rpm to get anything.
Seasoned HDF Member
Joined: Sep 2012
Posts: 6,570
Likes: 590
From: almost there
My WG bust 110 way too quickly and smoothly and has plently left to go. 110 quick is all I ask for. Elvis GONE. Sounds like you will have a good set up. Mine builds up best about 2500- 5500. No need to strech it. Head work makes it all happen.
Last edited by aces&8s; Oct 28, 2013 at 08:12 PM.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
Likes: 2,159
From: Ohio
W6H will carry to 6200 with no problems, W8 needs 10.6 to 10.8 compression to get thru the bottom end and then it's crazy like Elvis doing crack. I have hammered the W6H for several years and dependable cam with a bite when called upon, you will enjoy it if you choose that route.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Listening to y'all talk is making me think about doing some major motor work this winter.
I don't know why as I don't really push what I have all that much.
Sure sounds like fun though!!!!!!!!!!!!!
I don't know why as I don't really push what I have all that much.
Sure sounds like fun though!!!!!!!!!!!!!
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Thread Starter
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Joined: Jul 2012
Posts: 95
Likes: 1
From: Lincoln ne
Yeah they're both above 80tq at 5000 on most of the dyno runs close to the set up I'm looking at. Okay okay ya talked me into the 10.1:1's!!! I'm going with the w6h. I think id be stupid not to on a rd king with a fairing on it part time. The heads will be opened up and I'm considering torque cones. Whats gained with them (yes tq I get that) whats bad about them?
Texashillcountry ya might as well build yours and we can spend someone elsewhere money besides mine!! Haha!
Texashillcountry ya might as well build yours and we can spend someone elsewhere money besides mine!! Haha!
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Yeah they're both above 80tq at 5000 on most of the dyno runs close to the set up I'm looking at. Okay okay ya talked me into the 10.1:1's!!! I'm going with the w6h. I think id be stupid not to on a rd king with a fairing on it part time. The heads will be opened up and I'm considering torque cones. Whats gained with them (yes tq I get that) whats bad about them?
Texashillcountry ya might as well build yours and we can spend someone elsewhere money besides mine!! Haha!
Texashillcountry ya might as well build yours and we can spend someone elsewhere money besides mine!! Haha!
I can't really make up my mind.