Been looking into dual FCR 32 or 35s? figure any thing bigger would loose to much bottom end.Text FCR Page

 

Dual 35's.

 

We didn't lose bottom end with dual 38's. We did with dual 44's so they were relagated to NOS applications only because they did yield a couple more top end hp. Not sure it was worth it though.

I don't have any experience with 35's or 32's. We would lose hp if we went smaller than 38's with our stuff. jmo

 

Ive run 39s and noticed a loss of bottom when going from a big single but man those things pull for days. It seemed like they had no top end

 

This is true compared to the big single. I found the same thing. There is a cure for that though..........[img]i/expressions/face-icon-small-wink.gif[/img]

 

I'd think dual 32's since that should give you same opening area as 46mm single that would be plenty for a trail motor up to 720-730 cc.

 

I figured the 39s would be great for top end, but for dunning would a single be better?? 45/48? I was thinking with dual 32s or 35s keep that bottom end and pick up a bunch more midrage as well as more top end rev. Not wild ported heads, and average 11 1/2 pistons stock or 720 bore mid rage cams like the HPR3 and A1/A2 109s.
I was under the impression that duals are way smoother running over a single.

 

Ive found that the only thing I gained was top end and it was way out on the top. Well it did seem to rev a little faster but for the hassle of how much space for them and the pull I didnt think it was worth it. Thats just me and I really like the TM48. The low end was awesome even compared to the 45

 

One more thing I did try the Lectron 40s and I liked them better but still went with the TM48.

 

TM48 and the HV48 do you loose much bottom end over the TM45/HV46 ? Stock being 42