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[Mr D]

Oilcan,

What model bike are you doing this build on ??

[Hoist!]

You can use a thicker head gasket to lower compression too. An .050 should lower it about 1/4 point, giving you around 10.25:1. But I'm with Scott and like to keep my touring bike below 10:1, especially with good hi test hard to find in some locations. I set mine at 9.8:1!

Hoist!

[JDOFLHRIDER]

I was talking to my motor man and he has a set of custom cams ready for me to try out .He says they should help cool cly. down on my motor . My brothers bike in for recall now if the can work with him on the money he's willing to be the gunney pig or lucky one. Motor mans pro-gas drag bike leading points and runs 7.27's so he has my trust and has build some really good motors.I'll keep you guys updated on progrees and results for the new cams. RIDE SAFE JDO

[OILCAN1]

The bike is an 07 ultra classic with the cvo 110 engine upgrade.

[Mr D]

 And yes I am stuck with using HD parts as my wife is the marketing coordinator for a Harley dealership.

On that being said, Your choices are very limited using the Mo Co parts. The 251 works well with the 110 kit, But as said earlier it needs more compression for optimum performance. The dealer where your wife works do they have a good engine builder ? May be talk with him and see what he rec. None the less the stock CVO heads are going have to be worked.

[OILCAN1]

Got the appointment made for Oct 6. Going with the 251 cams and .005 over 10.5 pistons (might as well start with a fresh and true bore) The compression might be a little high, but the tech seems to think it will work out OK. Thanks eveybody for all the great input that is what makes this site top notch.

[Mr D]

Got the appointment made for Oct 6. Going with the 251 cams and .005 over 10.5 pistons (might as well start with a fresh and true bore) The compression might be a little high, but the tech seems to think it will work out OK. Thanks eveybody for all the great input that is what makes this site top notch.

Hey,
Did i say don't forget the 50mm throttle body ?? 

[SPIDERMAN]

Hey,
Did i say don't forget the 50mm throttle body ?? 

My recommendation is to send you stock TB to BC Gerolomy, tell them what you're running for cams, what you've got for heads exhaust etc and they will bore your stocker to suit your exact needs. Might be you only need 49mm or maybe you need 51 mm. I can tell you from experience, it makes a big difference in the overall performance of your machine


B B

[OILCAN1]

I've already got the SE 50mm TB as well as the race tuner and hi flo AC. I am currently running true duals.
I'm going to give them a try with the new set up but I'm sure eventualy I'll end up with a 2 into 1.

[SPIDERMAN]

I've already got the SE 50mm TB as well as the race tuner and hi flo AC. I am currently running true duals.
I'm going to give them a try with the new set up but I'm sure eventualy I'll end up with a 2 into 1.

Not trying to be a naysayer, but as I read this thread, I am wondering how you came to pick the parts you have ? Nothing wrong with using all H-D. I'm a big fan of using all H-D stuff in my motors and can get you some testemonials as to how well my motors always run. I read the specs on your cam and don't see how without having any work done to your heads you feel you need a bigger throttle body. Neither your heads nor your cam are going to be demanding more fuel than the stock 110 TB will provide.

B B

[OILCAN1]

The Larger TB will flow more air the fuel is all controlled by the injectors

[Unbalanced]

2 comments come to mind,

Just because you can flow more air doesnt mean it is beneficial, if you dont have the velocity to match the setup extra air will only worsen the situation until you get to a point if you get there that the heads can use the air correctly.  Usually you see something like this in a bike that is sluggish in the bottom and only runs when it is at wide open throttle when the motor can finally get to use the air.

If you are not at 70 percent duty cycle on your existing injectors there is no reason to go larger.   So what percentage of duty cycle are you at ?

[skyhook]

I believe stock 110" heads will outflow the stock throttle body...maybe by as much as 10 hp with the right cam..measured the valves when mine were off...2.08 intake and 1.6x exhaust...also there are a couple dynos on this site with stage 1 plus cam and you never see them above 108 hp with the stock tb...elsewhere on the web there are many charts of built-up '07 and later bikes(cvo and non-cvo have same tb)that show the same 108 hp limit

[OILCAN1]

I am not sure on the on the specs of how much the stock heads will flow but I am sure that since the MOCO went from a 46mm TB(07) to a 50mm TB(08) that the 50mm TB upgrade was not a waste. As far as the injectors that come in the 50mm TB they might be an overkill but there again I don't know all the specifics.

[skyhook]

they increased the size of the throttle blade to 50mm but did not redesign the poor flowing manifold...so it kinda was a waste