I was looking on the HQ website at the 103 and 107, they both list the same HP and Torque. I would have expected the 107 to have more HP and Torque then the 103. What is the benefit of the 107?

 

Actually, I think the 103 is listed as something like xHP/xTQ and the 107 is x+HP/x+TQ.

While there is clearly some advantage to increased cubes, it is quite nominal. For the $$$, I would probablyconsider the 103.

 

You are talkin' 4-5 HP difference at the most... I think I have to side with Phil on this and I personally am going for the 103" build.

 

You should ask Doug or Kevin at HQ; but, if IIRC, the 107 is a Revolutions Performance product with nikasil cylinders and their pistons--so it is not a custom/precision machined product by Doug. The RevPerf stuff is manufactured to certain specs and tolerances/variances and stored. The order is filled by pulling a set of cylinders. a set of pistons, etc.

An HQ 103 is custom built with the pistons matched to the specific cylinders you get; boxes of parts are not pulled and put into a bigger box and shipped.

I am pretty sure HQ will recommend the 103" rather than the 107" they offer as an accommodation to those customers who want it.

 

although i failed math in high school, and to this day i have to pull down my pants to count to 11, my caculations come out to 4 cubic inches...
just my smart assed comment for the day !!!!!!!!!!!!!!!

 

Note to self:

NEVER as John to calculate anythingthat results in a number greater than 10.

 

the worse part is a can read a micrometer, dial bore gauges, and vernier calipers all day. i can decifer the differance between american dollars and british pounds and how many pences make a quid, but simple math evades me........................ go figure

 

Bigjohn: Glad you cleared that up; I was worried about the HQ 113" you recently completed--maybe you just liked counting to 11 and that got in the way of the math.

 

The nikasil cylinders disapate heatfaster than steel lined aluminum cylinders. You will end up with an engine that runs cooler and it will maintain a more constat temprature which means you will have a more constant power output. I don't know if this is new to big twins, they have made these for Sportsters for years.Go to the Sportster web sights an read about them; they work.

 

hey jag1886, i have been asking the same question myself, why cant we just bore out a HD cylinder the extra .062 to make it a 107 vs. 103, heat transfer is one of my concerns, another is the strength or the spigot, would the aluninum or ductile iron HD liner be less likely to crack or break off ????? could save some serios money just boing out spare cylinders to build a 107