V7 cam

[Kev m]

Heron, all the way.  It accentuates low-mid range torque, best for real world riding.  As opposed to magazine/race track tests that are all about high rpm performance.

Do you want to live in the real world, or live just to satisfy some red-line cowboys.

Joe

You really should put some miles on a new hemi head smallblock. You would likely not type such silly things then.

Or maybe just pull up some Dyno sheets and compare.

But here are some thoughts:

* When Jay and I rode his V7C back to back with my then new MkI Stone we noted the 1TB Heron head seemed to be even more torquey and felt happier than the 2TB at about 300-500 rpm lower.

* The hemi head V7III Dyno sheet from Motorcycle.Com clearly shows the III makes equal or more torque than the MKII from 2200-6100 rpm, definitely MORE by 3000 rpm, and from 3k on up is already making more than 40 ft lbs which means more torque than the V7C ever makes anywhere on the curve.

What those facts tell us is there's nothing about it that is designed just to appeal to red-line cowboys.

My own experience suggests it simply improves upon what I already like about my Heron head smallblock.

[sign216]

 

I just think a 750cc Guzzi with a Heron head could still easily do ~70hp, if a much smaller bike managed to make over 100hp/litre. Not sure what the big difference would be. I also heard the Morini engineers spent a lot of time on getting the ports just right. I don't think Guzzi ever really wanted to pull more performance out of those engines (except for the new V85TT, that one seems decent, although it has the new heads), and even the hemi head V7's aren't exactly high performance... They might have only went that way to make the engines more conventional, since noone uses heron design anymore.

 

[Kev m]

And pigs could fly if they just had wings...

[Frenchfrog]

Yawn......Ed Millich proved that there's quite a lot to gain from a Guzzi heron .... and not just on a dyno.

[Kev m]

Yawn......Ed Millich proved that there's quite a lot to gain from a Guzzi heron .... and not just on a dyno.

Not for nothing but it took:


"V65 Racebike Dyno Run Mark II by Ed Milich

This is a dyno run for a modified V65 with:
fresh motor
stock cam
stock 30mm carbs
stock exhaust header
big K+N filters
open Bub pipe setup

...and here we go with the good stuff...
Bruce Meyers heads with oversized valves and porting
~12:1 compression via trimmed stock pistons and cylinders
reduced squish"

To get 49 rwhp/41 ft lbs of torque, which is only 1 hp more and less torque than a stock, emissions restricted V7III

He managed 2 hp more, but still less torque, by adding 36mm carbs.

I'm not diminishing his efforts (I'm a happy customer of his), but certainly it takes quite a bit just to match what the hemi head III does while meeting modern noise and emissions standards.

[sign216]

Yawn......Ed Millich proved that there's quite a lot to gain from a Guzzi heron .... and not just on a dyno.

I agree, and the Heron head gives a better real world riding experience.  Better torque at low and medium rpm.  I know, it doesn't make magazine reviewers happy, but that's where people really ride.  This red line nonsense is just that. 

[Kev m]

I agree, and the Heron head gives a better real world riding experience.  Better torque at low and medium rpm.

Except that we already demonstrated it doesn't.