Boosting up my evo
Thread Starter
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4th Gear
Joined: May 2019
Posts: 8
Likes: 0
From: Detroit
Boosting up my evo
Have a 1993 fatboy evo. Complete stock. Had some issues with the cv carb. Looking to boost the power up on it an since I got new bassani true duels that I am about to install. I figured to either get a s&s super e or just re build the cv and get thunderjets for it. Any suggestions
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,565
Likes: 3,318
From: Cental, MI
Carb and Pipes are Not the way to real horsepower... Sorry... Only Compression, or certainly, Cubes, will make any real horsepower.. and the Stock exhaust with free flowing mufflers as well as that CV carb are capable of feeding a fairly Hungry engine..
Remember when if ya bought all of the Gas saving gadgets available at JC Whitney... your car should actually be Making Gasoline!!!!!
Best yer gonna do is spend the maximum percentage of Funds for the least percentage of HP increase..
Remember when if ya bought all of the Gas saving gadgets available at JC Whitney... your car should actually be Making Gasoline!!!!!
Best yer gonna do is spend the maximum percentage of Funds for the least percentage of HP increase..
Thread Starter
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4th Gear
Joined: May 2019
Posts: 8
Likes: 0
From: Detroit
Ok lets ask one more time
Ok lets ask the question one more time any suggestions on power gains through either rebuilding my cv and adding thunderjets or getting a s&s carb. Need suggestions
Cruiser
Joined: Jul 2019
Posts: 186
Likes: 86
From: Pennsylvania
well i hate to tell ya but Racepres told you exactly what you need to do to get power gains
pipes and carbs only help once you have cam and head work, you could do a cam swap (EV27 or 13) and get power without head work. and not even have to get a new carb or exhaust.. rebuilding the CV will help it run better but not much more power.
pipes and carbs only help once you have cam and head work, you could do a cam swap (EV27 or 13) and get power without head work. and not even have to get a new carb or exhaust.. rebuilding the CV will help it run better but not much more power.
Seasoned HDF Member
Joined: May 2008
Posts: 21,032
Likes: 12,559
From: South Carolina
Don`t waste your money or effort with aftermarket gizmos for the CV carb, just jet it correctly and it will do everything you need with 80 cubes under the hood.
I`m getting ready to rebuild my CV carb from my old Softail (runs like it has some crud in it at low power), I`ll shoot some pics tomorrow.
I`m getting ready to rebuild my CV carb from my old Softail (runs like it has some crud in it at low power), I`ll shoot some pics tomorrow.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,565
Likes: 3,318
From: Cental, MI
^^ Well a cam may get some folks where they are lookin to go... but, in general, not without increasing RPM to the point an ignition system is needed... More RPM can equal some small bit more horsepower.. I'll sit here and bet in regards to Real, measureable Horsepower... just a change in Pipes to that Bassani will Reduce... not gain...while a Different Carburetor... Any Carburetor; will result in zero gain...assuming the one removed [the CV] was tuned Properly in the first place..
But... If you don't actually measure the gain/loss in some way... You will smile more if you spend the money, because it will sound fast, and obviously look very Fast..
Everyone knows the S&S carb is superior to any/all...possibly excepting the Mikuni HSR... which may cost just a bit more also!!!
At Least the proper HSR will Not hinder performance!!!
I'll slip out the back door now... so the proponents of "Spend big to get big" can help you spend yer money...
Excellent advice... do Not fall for the JC Whitney Advertising of Miracle Gizmos!!!!
But... If you don't actually measure the gain/loss in some way... You will smile more if you spend the money, because it will sound fast, and obviously look very Fast..
Everyone knows the S&S carb is superior to any/all...possibly excepting the Mikuni HSR... which may cost just a bit more also!!!
At Least the proper HSR will Not hinder performance!!!
I'll slip out the back door now... so the proponents of "Spend big to get big" can help you spend yer money...
Don`t waste your money or effort with aftermarket gizmos for the CV carb, just jet it correctly and it will do everything you need with 80 cubes under the hood.
I`m getting ready to rebuild my CV carb from my old Softail (runs like it has some crud in it at low power), I`ll shoot some pics tomorrow.
I`m getting ready to rebuild my CV carb from my old Softail (runs like it has some crud in it at low power), I`ll shoot some pics tomorrow.
Last edited by Racepres; Oct 22, 2019 at 06:43 PM.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
If it were my bike I'd put an EV-13, the S&S E carb, and the Bassani Pipes on it.
Only reason I'd change the pipes is I don't like the crossover on the stock pipes that covers the motor.
You won't gain much but what you do gain will put a smile on your mouth!!!!!
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Road Master
Joined: Jun 2019
Posts: 952
Likes: 528
From: Richmond TX
Many years ago I spoke with the owner of HeadQuarters at length. He advised me of two things about my Evo. He had done substantial dyno work and had never seen anything give better results than the stock headers complete with the cross-over pipe, coupled with just about any free flowing slip-on exhaust. The second thing he said was that Evo's really respond well to increased compression. His head job included shaving .070" and a corresponding skim of the intake manifold to compensate for the reduced height.
I shipped him my heads and manifold for his treatment, and added a set of Cycle Shack side dumps. I spent several weeks doing plug chops and dialing in the CV carb, and I took the time to index the spark plugs. The next year I paid for a dyno run at a bike rally. The dyno operator asked me what cam I was running. I told him it was stock and he insisted that the previous owner must have changed the cam. I insisted that I was the original owner and the cam was factory. He advised that he had never seen better numbers from a 'stock' Evo. His machine showed I had 69hp and I wish I could remember the peak torque. I sold the bike to my son and he has the dyno sheet. He had a failed lifter at 90k miles and it impaired the stock cam. This past winter he went with an EV-27 and his butt dyno shows it's running very well, maybe a bit stronger but never measured objectively.
My suggestion for applying the 80-20 rule to your Evo is to live with the CV carb, consider shaving the heads and consider keeping the stock headers. If you prefer the look of the Bassani's well why not, it's your bike to enjoy! Just thought I'd share some ancient history.
I shipped him my heads and manifold for his treatment, and added a set of Cycle Shack side dumps. I spent several weeks doing plug chops and dialing in the CV carb, and I took the time to index the spark plugs. The next year I paid for a dyno run at a bike rally. The dyno operator asked me what cam I was running. I told him it was stock and he insisted that the previous owner must have changed the cam. I insisted that I was the original owner and the cam was factory. He advised that he had never seen better numbers from a 'stock' Evo. His machine showed I had 69hp and I wish I could remember the peak torque. I sold the bike to my son and he has the dyno sheet. He had a failed lifter at 90k miles and it impaired the stock cam. This past winter he went with an EV-27 and his butt dyno shows it's running very well, maybe a bit stronger but never measured objectively.
My suggestion for applying the 80-20 rule to your Evo is to live with the CV carb, consider shaving the heads and consider keeping the stock headers. If you prefer the look of the Bassani's well why not, it's your bike to enjoy! Just thought I'd share some ancient history.
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
Many years ago I spoke with the owner of HeadQuarters at length. He advised me of two things about my Evo. He had done substantial dyno work and had never seen anything give better results than the stock headers complete with the cross-over pipe, coupled with just about any free flowing slip-on exhaust. The second thing he said was that Evo's really respond well to increased compression. His head job included shaving .070" and a corresponding skim of the intake manifold to compensate for the reduced height.
I shipped him my heads and manifold for his treatment, and added a set of Cycle Shack side dumps. I spent several weeks doing plug chops and dialing in the CV carb, and I took the time to index the spark plugs. The next year I paid for a dyno run at a bike rally. The dyno operator asked me what cam I was running. I told him it was stock and he insisted that the previous owner must have changed the cam. I insisted that I was the original owner and the cam was factory. He advised that he had never seen better numbers from a 'stock' Evo. His machine showed I had 69hp and I wish I could remember the peak torque. I sold the bike to my son and he has the dyno sheet. He had a failed lifter at 90k miles and it impaired the stock cam. This past winter he went with an EV-27 and his butt dyno shows it's running very well, maybe a bit stronger but never measured objectively.
My suggestion for applying the 80-20 rule to your Evo is to live with the CV carb, consider shaving the heads and consider keeping the stock headers. If you prefer the look of the Bassani's well why not, it's your bike to enjoy! Just thought I'd share some ancient history.
I shipped him my heads and manifold for his treatment, and added a set of Cycle Shack side dumps. I spent several weeks doing plug chops and dialing in the CV carb, and I took the time to index the spark plugs. The next year I paid for a dyno run at a bike rally. The dyno operator asked me what cam I was running. I told him it was stock and he insisted that the previous owner must have changed the cam. I insisted that I was the original owner and the cam was factory. He advised that he had never seen better numbers from a 'stock' Evo. His machine showed I had 69hp and I wish I could remember the peak torque. I sold the bike to my son and he has the dyno sheet. He had a failed lifter at 90k miles and it impaired the stock cam. This past winter he went with an EV-27 and his butt dyno shows it's running very well, maybe a bit stronger but never measured objectively.
My suggestion for applying the 80-20 rule to your Evo is to live with the CV carb, consider shaving the heads and consider keeping the stock headers. If you prefer the look of the Bassani's well why not, it's your bike to enjoy! Just thought I'd share some ancient history.
Tourer
Joined: Jun 2019
Posts: 439
Likes: 256
From: Pa
I just did a cam lifters and a programable ingition,w/a stealth S&S super E shorty, Its a very nice bump up. Love to have that Basinni exhaust to finish it right,I've got baffled Longshots on it. I'm content for the moment,be careful what you wish for cuz it's like crack. Once you get a taste ya want more.
Last edited by Rsbenden; Oct 22, 2019 at 08:10 PM.