Power left on the table?
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Joined: Sep 2015
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From: Omaha
Power left on the table?
Ok EVO guys I have a question that's been bugging me, what is a respectable HP number on the 80in evo? I built mine with what I thought would be a pretty stout build, 10.5:1 pistons, SE Heads, SE57 cam, Mikuni, Dynatech ignition, 2-1 exhaust and it put down 81.7hp and 89.4tq. The bike runs great and I love it, I just keep thinking I missed something but my buddy keeps reminding me its only 80 inches and 80+ is pretty good
What do you guys think?
What do you guys think?
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Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
If you contact someone like Scott at Hillside Cycle, an HDF sponsor, I think you can clear 100HP with an 80". Does that mean you're missing out? A difficult one - give Scott a call if it bugs you!
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
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From: Farmington ,MS
When you become obsessed with dyno numbers...bad things happen.
If you build a 100 HP 80" EVO...it will most likely make it's HP out of the RPM range that you normally ride in...and actually make less HP in the lower RPMs ...making it not really street friendly.
The best way to make reliable HP is to increase cubic inches.
If you build a 100 HP 80" EVO...it will most likely make it's HP out of the RPM range that you normally ride in...and actually make less HP in the lower RPMs ...making it not really street friendly.
The best way to make reliable HP is to increase cubic inches.
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Joined: Aug 2008
Posts: 5,080
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From: Ohio
Those are good numbers for a 80"
89 torque should hit hard in the right spot, you can get that HP number up by a cam change but the downfall is needing to run the RPM's deeper which isn't a great thing with a stock crank 80" If someone tells you the stock 80" crank is bullet proof in building power, they are wrong, 2 have snapped with members on here and a disaster was the outcome.
Don't take this in a wrong way but would like to know your theory of SE heads and the older SE57 cam. Head porters are getting better numbers out of stock head castings and some modern cams that can push 95/95 but once again the engine is a becoming a time bomb. I'm familiar with SE heads and know they can create numbers but usually opposite of your numbers because of the raised ports
89 torque should hit hard in the right spot, you can get that HP number up by a cam change but the downfall is needing to run the RPM's deeper which isn't a great thing with a stock crank 80" If someone tells you the stock 80" crank is bullet proof in building power, they are wrong, 2 have snapped with members on here and a disaster was the outcome.
Don't take this in a wrong way but would like to know your theory of SE heads and the older SE57 cam. Head porters are getting better numbers out of stock head castings and some modern cams that can push 95/95 but once again the engine is a becoming a time bomb. I'm familiar with SE heads and know they can create numbers but usually opposite of your numbers because of the raised ports
Last edited by 1997bagger; Jun 5, 2017 at 05:17 PM.
Thread Starter
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Joined: Sep 2015
Posts: 97
Likes: 32
From: Omaha
Those are good numbers for a 80"
89 torque should hit hard in the right spot, you can get that HP number up by a cam change but the downfall is needing to run the RPM's deeper which isn't a great thing with a stock crank 80" If someone tells you the stock 80" crank is bullet proof in building power, they are wrong, 2 have snapped with members on here and a disaster was the outcome.
Don't take this in a wrong way but would like to know your theory of SE heads and the older SE57 cam. Head porters are getting better numbers out of stock head castings and some modern cams that can push 95/95 buy once again the engine is a becoming a time bomb. I'm familiar with SE heads and know they can create numbers but usually opposite of your numbers because of the raised ports
89 torque should hit hard in the right spot, you can get that HP number up by a cam change but the downfall is needing to run the RPM's deeper which isn't a great thing with a stock crank 80" If someone tells you the stock 80" crank is bullet proof in building power, they are wrong, 2 have snapped with members on here and a disaster was the outcome.
Don't take this in a wrong way but would like to know your theory of SE heads and the older SE57 cam. Head porters are getting better numbers out of stock head castings and some modern cams that can push 95/95 buy once again the engine is a becoming a time bomb. I'm familiar with SE heads and know they can create numbers but usually opposite of your numbers because of the raised ports
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Joined: Mar 2010
Posts: 21,095
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From: Poolville
That's right Bagger......
I'm one of the guys who was obsessed with the 100 mark of an 80'er. Sheared my crank pin.. It ain't worth it... But if you want, a Woods W8 is a much better cam that that 57... It looks like your heads are holding you back a little as well.... Stock heads ported to stage II with 1.90 intake and 1.63 exhaust with a port matched intake and an S&SE you will get into the mid 90's. But it will destruct eventually..... Never a fan of Mikuni or SE stuff......
Just do what aces&8's did..... By yourself an S$S 111V
I'm one of the guys who was obsessed with the 100 mark of an 80'er. Sheared my crank pin.. It ain't worth it... But if you want, a Woods W8 is a much better cam that that 57... It looks like your heads are holding you back a little as well.... Stock heads ported to stage II with 1.90 intake and 1.63 exhaust with a port matched intake and an S&SE you will get into the mid 90's. But it will destruct eventually..... Never a fan of Mikuni or SE stuff......
Just do what aces&8's did..... By yourself an S$S 111V
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,080
Likes: 2,154
From: Ohio
The bike really does run good and is a blast to ride so I would say that it was a good build, we picked the parts with reliability in mind, nothing was really too crazy and the specs showed they would all work well together and I knew a few guys that used this combo back in the day with good results. Reworked stock heads or having these ones ported probably could have yielded better results
You are correct about the SE heads having some on the table, most likely with some port work those HP numbers will come up. A engine builder on another forum can do some magic with those SE heads and a specialist with setting them up
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Joined: Aug 2008
Posts: 22,857
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From: Lafayette, Louisiana
Hillside is the popular go to shop these days.
In the era our bikes were built, Jerry Branch of Branch Flowmetrics was legendary.
Today that continues as Branch O'Keefe. I haven't heard much about them in a long time though.
In the era our bikes were built, Jerry Branch of Branch Flowmetrics was legendary.
Today that continues as Branch O'Keefe. I haven't heard much about them in a long time though.