Boring factory 107" cylinders

[Ohio HD]

My sheets show the CR480 closes at 17°. Also the link below to Fuel Moto's site gives the same.

CR480 @ Fuel Moto

[Adam76]

My sheets show the CR480 closes at 17°. Also the link below to Fuel Moto's site gives the same.

CR480 @ Fuel Moto

Good catch, thanks 

[Adam76]

My sheets show the CR480 closes at 17°. Also the link below to Fuel Moto's site gives the same.

CR480 @ Fuel Moto

Looks like I'm stuck with the 107" displacement for a while. Funds aren't allowing the 114" big bore plans I had.

How does the CR480 cam hold up in a 107" softail??  Fuel Moto have advised me that it's more a mid range cam with most of the power from 2700rpm - 5000rpm. 

Maybe a good exhaust like the D&D Fat Cat might make it work better?  I'm looking for a nice broad TQ curve from 2000rpm - 4500 rpm. They suggested the Woods WM8-22X cam for good low - mid power in a 107 softail.

I haven't seen any love for the Woods 22X cam here on this forum... Is there a reason why?

Thanks

[Hossamania]

There is a tendency to chase horsepower, both on this forum and on barstools. The right cam choice needs to be made with clear goals in mind, the 22x seems to meet your needs.
Check the sticky threads in this section for testing multiple cams by Fuel Moto and Durwood.

https://harleytechtalk.com/htt/index.php/topic,102329.0.html

[Adam76]

There is a tendency to chase horsepower, both on this forum and on barstools. The right cam choice needs to be made with clear goals in mind.....

Not chasing HP at all.
Just trying to get the right combination of cam, displacement and exhaust to maximise the outcome and not be disappointed when it's done.
Thanks. 

It looks like exhaust choice also plays a big role in the 107" stage 2 builds.... Do you think the D&D Fat Cat is the best exhaust for the softail stage 2? Might be worth considering instead of the Bassani 2-1 I was going for.

Thanks

[Hossamania]

My comment about chasing horsepower was a general statement when builds and motors are discussed, that leads to sometimes choosing cams that aren't really what the owner wanted. All the cams tested by Fuel Moto in the link I included made over 100 lbs. of torque between 2000-3000 rpm, with the 22x seeming to make the most in that range, right where you're wanting it. It still made good horsepower at the top end, should you want to go there occasionally....

[Adam76]

My comment about chasing horsepower was a general statement when builds and motors are discussed, that leads to sometimes choosing cams that aren't really what the owner wanted....

Agreed. 
Thanks

[Adam76]

I'd think that a 107 with a cam/AC/slip-ons/tuner will provide that. 115-120 TQ, 100-107 HP, cam dependent. After that, it's gravy.

OK, totally fair point. BUT this is a Softail 107" not a tourer with the advantage of longer pipes and mufflers....  The more I look at the bolt in cams for the 107" more I see how exhaust sensitive they are...

What bolt in cam (RS468 / WM8-22X / CR480)  works with best with which exhaust / slip ons?  (S&S slash cut slip ons / D&D fat cat 2-1 / S&S super street 2-1 / Bassani RR 2-1 with Quiet baffle ?? or any others I've missed.

I feel like matching the exhaust and camshaft is really important when building a recipe for a good stage 2 softail 107"


EDIT:   ahh F*&k it, this is doing my head in.... I'm just going to get the CP 10.75 comp 4.125"  pistons and bore my 107" out to 117" with the CR480.  Proven winner.

[Hossamania]

Now you're talking!

[Deye76]

The S&S Superstreet 2 into 1 is longer than many other 2X1 pipes for M8 softails. Even with a CAT they perform very well IME.You cannot see attachments on this board.

[Adam76]

Now you're talking!

Is it still considered safe to bore 107 cylinders out to  117"  ??

[Adam76]

The S&S Superstreet 2 into 1 is longer than many other 2X1 pipes for M8 softails. Even with a CAT they perform very well IME.

Hey, thanks for the advice. Would I be losing any TQ if I took the Db reducer out of the S&S 2-1 super street pipe?
It's a little droning sounding with it in.
Cheers

[Adam76]

This is a CR483 that also is only available from Alpha Performance Engines. A broader power range. They don't say what size the motor was in the dyno run.

Thanks Ohio. I've decided to keep my CR480 cam and just build on that.

I'm trying to match a set of 107" - 114"  big bore pistons to a set of Cometic Head Gaskets...   (I don't want to bore my factory cy;linders to 117" just to be on the safe side).

JE pistons list their 107"  - 114" pistons as having a bore size of  4.080"

But I can't find Cometic Head Gaskets in that bore size -- I can only see the 4.075" bore size gaskets which is smaller than the actual piston size??

This is confusing. I've also read on Fuel Moto's site that they no longer bore factory cylinders.... which makes me definitely wary of going to 117" (4.125")  on my factory cylinders.
Thanks in advance for any explanation of what size / application I need.
Cheers

[FLSTFIDave]

The S&S Superstreet 2 into 1 is longer than many other 2X1 pipes for M8 softails. Even with a CAT they perform very well IME.You cannot see attachments on this board.

Nice build.  A whole lot of why the CR-480 is liked by so many.

[Deye76]

The S&S Superstreet 2 into 1 is longer than many other 2X1 pipes for M8 softails. Even with a CAT they perform very well IME.

Hey, thanks for the advice. Would I be losing any TQ if I took the Db reducer out of the S&S 2-1 super street pipe?
It's a little droning sounding with it in.
Cheers

I'd leave it as is. I like that it's fairly quiet at steady cruise, and emits a decent bark under full throttle.

[Adam76]

Anyone know if Cometic make head gaskets with 4.08" bore size?

Id like to use JE 107" - 114" big bore pistons which are listed as having a bore size of  4.080"

But the only Cometic head gasket size I can find is 4.075" which is smaller than the actual bore size?

[Ohio HD]

Any of the motor machine shops and builders listed in the vendor section of HTT can be a one stop shopping for pistons and gaskets.

[JSD]

Adam S&S have bigger kits now so you can pic up a 124 a lot cheaper. Check there site. I see some shops in OZ doing good prices on the S$S 124 kits. I think they are 11.1 so is the 480 suitable i ask ?

[Adam76]

I couldn't find the right size head gasket (4.080") to go with a set of JE 4.080"  107"-114" pistons.....  Could only find Cometic 4.075"  size HGs.

So unless it is no longer recommended ??  I'll have to bore my stock 107 cylinders to fit a set of 4.125"  CP 10.75 comp pistons to bring me to 117"....
This is the most economical big bore build for me and all the power I will ever need.

Thanks.

[rigidthumper]

I'd get a set of 114/117 take off cylinders if you are going to 4.125.

[boooby1744]

I couldn't find the right size head gasket (4.080") to go with a set of JE 4.080"  107"-114" pistons.....  Could only find Cometic 4.075"  size HGs.

So unless it is no longer recommended ??  I'll have to bore my stock 107 cylinders to fit a set of 4.125"  CP 10.75 comp pistons to bring me to 117"....
This is the most economical big bore build for me and all the power I will ever need.

Thanks.

Cometic can probably make any gasket you need.

[kd]

I couldn't find the right size head gasket (4.080") to go with a set of JE 4.080"  107"-114" pistons.....  Could only find Cometic 4.075"  size HGs.

So unless it is no longer recommended ??  I'll have to bore my stock 107 cylinders to fit a set of 4.125"  CP 10.75 comp pistons to bring me to 117"....
This is the most economical big bore build for me and all the power I will ever need.

Thanks.

Cometic can probably make any gasket you need.

    I would call them if you can't find them in their catalogue.  I would be surprised they don't have them.  In the past they have made the claim that if they have the correct material dimensions they will make it for you and there is normally no extra surcharge.  Don't forget to ask though.  If they are making them for you, get an extra set.

[Adam76]

I'd get a set of 114/117 take off cylinders if you are going to 4.125.

OK thanks, I was told that the 114" and 117" cylinders don't work on a 107" engine due to the different stroke....
How would you get them to fit a 107" without the pistons sitting waaay down the hole?

Thanks

[Ohio HD]

Cylinder heights are all the same. Pistons change with the stroke change. The compression height of the piston changes. 

[Adam76]

Cylinder heights are all the same. Pistons change with the stroke change. The compression height of the piston changes. 

OK thanks, that makes sense.

So what / which pistons do I need to use the 114" cylinders on a 107" stroke button end?