Really disappointed
Thread Starter
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Cruiser
Joined: Jul 2012
Posts: 201
Likes: 22
From: Gallipolis, OH
Really disappointed
Had my bike on the dyno this past weekend and I am not happy with the outcome. The bike made 120.1 HP and 125.6 ft lbs. I was expecting more with my current set up. This is what I am currently running.
11.8 to 1 Compression Ratio ( SE 12.1 Pop up Pistons)
62mm throttle body and intake manifold and breather.
Hurricane Heads
S&S .640 easy start cams
4.89 gram injectors
Rhinehart Crossbacks ( still waiting on my RB Racing Pro Stock)
Zippers Chain Conversion Kit
Not sure why my numbers were so low. The 120R before me made 128/131. Any input is appreciated.
11.8 to 1 Compression Ratio ( SE 12.1 Pop up Pistons)
62mm throttle body and intake manifold and breather.
Hurricane Heads
S&S .640 easy start cams
4.89 gram injectors
Rhinehart Crossbacks ( still waiting on my RB Racing Pro Stock)
Zippers Chain Conversion Kit
Not sure why my numbers were so low. The 120R before me made 128/131. Any input is appreciated.
Outstanding HDF Member
Joined: Jan 2014
Posts: 2,181
Likes: 488
From: Central California
What were you using for fuel? I ask because that's a fairly high CR for pump gas.
Try different ignition timing settings?
Work with the fuel map at all?
A bunch of little things can keep a motor from reaching its full potential.
Also, what about the heads? That's where real gains are made. You can have really b!itchin' shortblock with a mediocre set of heads that will will put out mediocre power. Or, a mediocre shortblock with a b!tchin' set of heads that will far exceed expectations.
Try different ignition timing settings?
Work with the fuel map at all?
A bunch of little things can keep a motor from reaching its full potential.
Also, what about the heads? That's where real gains are made. You can have really b!itchin' shortblock with a mediocre set of heads that will will put out mediocre power. Or, a mediocre shortblock with a b!tchin' set of heads that will far exceed expectations.
Last edited by Mike Lawless; Jun 23, 2015 at 04:51 PM.
Outstanding HDF Member
Joined: Jan 2014
Posts: 2,181
Likes: 488
From: Central California
A couple gallons of 100 plus octane race gas would be a good and relatively inexpensive thing to try. I'd bet money that you would see an improvement.
I've been drag racing a long time. Currently I run an air-cooled VW that makes over 500hp out of 2300cc (142cu. in.). As such, I have a good grasp of what works and what doesn't. A lot of guys say you can run a 12-1 CR motor on pump gas, and you can...to a point. But that's into the territory where it needs more octane than pump gas can provide for full power pulls. Give it a try. A couple gallons ($15/Gal) will let you know quickly.
I've been drag racing a long time. Currently I run an air-cooled VW that makes over 500hp out of 2300cc (142cu. in.). As such, I have a good grasp of what works and what doesn't. A lot of guys say you can run a 12-1 CR motor on pump gas, and you can...to a point. But that's into the territory where it needs more octane than pump gas can provide for full power pulls. Give it a try. A couple gallons ($15/Gal) will let you know quickly.
Road Master
Joined: Dec 2011
Posts: 911
Likes: 9
From: colorado
Had my bike on the dyno this past weekend and I am not happy with the outcome. The bike made 120.1 HP and 125.6 ft lbs. I was expecting more with my current set up. This is what I am currently running.
11.8 to 1 Compression Ratio ( SE 12.1 Pop up Pistons)
62mm throttle body and intake manifold and breather.
Hurricane Heads
S&S .640 easy start cams
4.89 gram injectors
Rhinehart Crossbacks ( still waiting on my RB Racing Pro Stock)
Zippers Chain Conversion Kit
Not sure why my numbers were so low. The 120R before me made 128/131. Any input is appreciated.
11.8 to 1 Compression Ratio ( SE 12.1 Pop up Pistons)
62mm throttle body and intake manifold and breather.
Hurricane Heads
S&S .640 easy start cams
4.89 gram injectors
Rhinehart Crossbacks ( still waiting on my RB Racing Pro Stock)
Zippers Chain Conversion Kit
Not sure why my numbers were so low. The 120R before me made 128/131. Any input is appreciated.
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Thread Starter
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Cruiser
Joined: Jul 2012
Posts: 201
Likes: 22
From: Gallipolis, OH
I also have a 120
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Thread Starter
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Cruiser
Joined: Jul 2012
Posts: 201
Likes: 22
From: Gallipolis, OH
Was the 120R an A motor or a B motor? Ive got a B motor going to the dyno tomorrow. 10.8:1 CR, 58 mm throttle body, 640 cam but Im at 5000 ft of elevation. I will let you know what I do. My builder has an A motor in a dyna that does 128/130 at this altitude. Ive also got 2 into 2 exhaust so Im leaving power on the table.
