disapointing dyno results

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May 12, 2010 | 08:19 PM

#11

mike06train

Road Captain

Joined: Jun 2009

Posts: 717

Likes: 1

From: Drexel Hill, Pa

Too many questions to ask on line to figure out whats up. But with that build you should be at least near 90 horse.

May 12, 2010 | 09:18 PM

#12

KumaRide

Grand HDF Member

Joined: May 2008

Posts: 4,624

Likes: 189

From: Newcastle, Ca.

So you had a dyno run by a tuner you trust. Does he think its a bad tune and he can fix it? Have seen other builds with "canned" maps being a bit lazy. 50 hp is really low though. Sumping, may be...

May 12, 2010 | 09:26 PM

#13

'05Train

Ultimate HDF Member

Joined: May 2008

Posts: 7,439

Likes: 884

From: 'Noke, VA

I see a couple of potential issues. The stock heads, the canned map, and possible sumping. Even with the stock heads, your numbers should be much higher, so I'm thinking it's a combination of a bad tune (get a TTS and do it yourself!) and a sumping issue.

Any chance your clutch is slipping?

May 12, 2010 | 09:37 PM

#14

arealinvestor

Road Master

Joined: Jun 2008

Posts: 868

Likes: 1

From: Trenton,N.J.

Quote:

Originally Posted by 07FXTBi

i have recently had a big bore and cam install but the problem is on the dyno,
only ended up with 50 hp and 85 torque.
my build is 96" to 103" using wiseco k1751 dished pistons,
stock heads
red shift 575 cams
K&N filter
bub jug hugger exhaust.
PCV bought from fuel moto.
the bike is a 2007 night train.
thanks in advance

Who did this build?? You never mention what compression the bike was set at,or if the heads were CC'd to get the comp right.The tune is probably very poor also.You should have it checked.You also need to do a leak down test, & check & make sure your not sumping oil also!!!

May 12, 2010 | 10:05 PM

#15

BlueHog54

Novice

Joined: Nov 2008

Posts: 17

Likes: 0

From: Charlotte NC

I just had the big bore kit (88 to 95) done on an 05 Deuce with SE 211 cams and dyno tuned. 97 HP 101 TQ.

May 12, 2010 | 11:46 PM

#16

story808

Seasoned HDF Member

Joined: Nov 2007

Posts: 6,790

Likes: 10

From: Hawaii

Those are some bad numbers... I got just about 70hp and 80tq out of my 88"

May 12, 2010 | 11:54 PM

#17

Inspector 12

Road Master

Joined: Nov 2009

Posts: 1,218

Likes: 0

From: Yakima WA

Sounds like something very wrong somewhere, my 96 inch stock engine made 68 hp and 84 torque. After the stage II 103 kit install it now makes 92 hp and 106 torque.

May 13, 2010 | 02:20 AM

#18

County98

Tourer

Joined: Sep 2007

Posts: 469

Likes: 0

From: Las Vegas, NV

Something is not right which I'm sure you know by now.

I'm still teaching myself about working my bike, but if it was a car, I'd say cam choice/matched with heads/lower than stock compression/tuning could all be players.

Also agree with checking for sumping. I've seen oil bleed alot of power off a crank without a windage tray (Also on old muscle cars).

Good luck!

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May 13, 2010 | 03:56 AM

#19

07FXTBi

Thread Starter

6th Gear

Joined: May 2007

Posts: 13

Likes: 0

From: rossendale, UK

thanks for the input guys,
this sort of build is really used on road kings etc, i want a cruiser more than a
hotrod as i use the motorways a lot.
well it sounds like a rip down.....
all the best lads.