2016 V7II Racer modification

[mwrenn]

Just a couple of pictures, work in progress.

[jlburgess]

Where did the heads come from?  That should give it a boost!

[sign216]

Great work.  Thanks for keeping us posted.  Can't wait to see the dyno of the finished engine.

[Bisbonian]

Where did the heads come from?  That should give it a boost!

Quick guess would be that they are from Todd at Guzzitech as he has been developing some 4 valve heads for the small blocks.

[Chuck in Indiana]

Ok, Mike.. what's the scoop?  Those don't appear to be stock Lario heads..

[mwrenn]

Quick guess would be that they are from Todd at Guzzitech as he has been developing some 4 valve heads for the small blocks.

Yep!

[mwrenn]

Ok, Mike.. what's the scoop?  Those don't appear to be stock Lario heads..

V75 heads with some porting and bigger valves...

[sib]

Enjoy it while it lasts, which will probably be about 5000 mi before the tappets and cams are shot.  I hope you enjoy the extra 10% or so hp.

I'm not a fan of mods that add many extra parts and much extra moving weight for little gain, no matter how pretty it looks.

[Kev m]

Enjoy it while it lasts, which will probably be about 5000 mi before the tappets and cams are shot.  I hope you enjoy the extra 10% or so hp.

What makes you say that?

[Unkept]

Not to be a nitpicker, but before it's finished I'd think it would look cleaner/better if the fins were rounded on the heads a bit to match, and a repaint to match the silver colors.

I bet this will be a fun bike!

[Aaron D.]

What makes you say that?

I think he missed the previous chapter.

[jas67]

Just a couple of pictures, work in progress.

 

[cloudbase]

I think he missed the previous chapter.

Past performance blah, blah, future results blah, blah.

[mwrenn]

Enjoy it while it lasts, which will probably be about 5000 mi before the tappets and cams are shot.  I hope you enjoy the extra 10% or so hp.

I'm not a fan of mods that add many extra parts and much extra moving weight for little gain, no matter how pretty it looks.

LMAO.  No, I'm not a fan of those things either.

[mwrenn]

Not to be a nitpicker, but before it's finished I'd think it would look cleaner/better if the fins were rounded on the heads a bit to match, and a repaint to match the silver colors.

I bet this will be a fun bike!

Yes, rounded head fins, or some old style angular cylinders would look better, matching the paint shouldn't be a big deal.   Working on the fit and tuning first.  I think it will be a blast to ride!

[Chuck in Indiana]

Yes, rounded head fins, or some old style angular cylinders would look better, matching the paint shouldn't be a big deal.   Working on the fit and tuning first.  I think it will be a blast to ride!

Oh, you *know* it will be a blast to ride, Mike.  Are these the rumored 800 and some cc heads? Cam change?
As far as reliability goes.. would I fly it? Uh.... 

[mwrenn]

Oh, you *know* it will be a blast to ride, Mike.  Are these the rumored 800 and some cc heads? Cam change?
As far as reliability goes.. would I fly it? Uh....

Those are the 820cc cylinders.  No cam change.  I have 7800 miles on my build now.  Setting the valve clearance every 2500 miles.
It been very reliable so far.  Just gotta keep putting the miles on it.  I checked valve clearance before and after the full bore dyno run.  It didnt change a bit.  I think a huge help towards reliability is the built in rev limiter, it is really easy to wind it up quick, but once you get used to the limiter being there, it makes you aware of it, and you wind up shifting up right at 7000 rpm.  Fun stuff....
Heck, I'd fly it....

[kevdog3019]

Can't wait Mike til you get this one out with the bigger 820 kit. 

Lets see where you're differences add up:

Solid valve-train
rev-limiter

You are worlds ahead.

[Chuck in Indiana]

I was running it up to 7800 all the time.. that *may* have been my problem.. or not. Dunno. Sure was fun while it lasted, though.  I would have loved to keep experimenting with it, but the Aero engine was just too good an opportunity to pass up.

[mwrenn]

I was running it up to 7800 all the time.. that *may* have been my problem.. or not. Dunno. Sure was fun while it lasted, though.  I would have loved to keep experimenting with it, but the Aero engine was just too good an opportunity to pass up.

That Aero engine is a one of a kind bike for sure!  I am hoping for better torque numbers with the 820cc kit.  A little more surface area on the piston should make a measurable change.  We will see.

[Chuck in Indiana]

That Aero engine is a one of a kind bike for sure!  I am hoping for better torque numbers with the 820cc kit.  A little more surface area on the piston should make a measurable change.  We will see.

Oh, I would think it will. That is the one area that the 4 valve is lacking.. riding them back to back, the low end torque of the 2 valve V7 is noticeably better.  Above 5K it's nolo contendere. 

[cruzziguzzi]

I won't pic nits regarding shape, color, functionality or longevity nor overlay my preferences upon someone else's time or efforts but I would like to see the work that went into this offered in a two valve, big valve, "Hemi" head as well.

Probably mostly to get rid of the industrial pimple valve covers on the baby Breva. The second ugliest style point in Guzzi's history. Y'all know damn well what the first ugliest is - don't fish!

Oops - kinda did it anyhoo...


Todd.

[mwrenn]

I won't pic nits regarding shape, color, functionality or longevity nor overlay my preferences upon someone else's time or efforts but I would like to see the work that went into this offered in a two valve, big valve, "Hemi" head as well.

Probably mostly to get rid of the industrial pimple valve covers on the baby Breva. The second ugliest style point in Guzzi's history. Y'all know damn well what the first ugliest is - don't fish!

Oops - kinda did it anyhoo...


Todd.

I've been looking into an aftermarket production 4V head from a billet.  So far everyone I have spoken with does not have the capability.  I do think it would make more sense to have a 2 valve hemi head like Chuck's bike.   A lot less moving parts, and the same airflow would be a good goal to shoot for.  But for now, the 4V heads are not impossible to get, and they do work.  Its all fun to mess with anyway.

[kevdog3019]

I've been looking into an aftermarket production 4V head from a billet.  So far everyone I have spoken with does not have the capability.  I do think it would make more sense to have a 2 valve hemi head like Chuck's bike.   A lot less moving parts, and the same airflow would be a good goal to shoot for.  But for now, the 4V heads are not impossible to get, and they do work.  Its all fun to mess with anyway.

I'm not sold, sorry.

[oldbike54]

                                              The Oklahoma Hot Rod .Slight return . (Withe apologies to Jimi Hendrix)



 Dang Mike , keep this up , Enid will become known as the SB performance capitol .

  Dusty

[kevdog3019]

                                              The Oklahoma Hot Rod .Slight return . (Withe apologies to Jimi Hendrix)



 Dang Mike , keep this up , Enid will become known as the SB performance capitol .

  Dusty

I think you've already achieved that status.  55hp and counting is pretty darned good!

[oldbike54]

I think you've already achieved that status.  55hp and counting is pretty darned good!

 Mike may not be a native Okie , but we lay claim to him 

  Dusty

[mwrenn]

Mike may not be a native Okie , but we lay claim to him 

  Dusty

LOL!  Wish I could have made Canton.  A perfect day, and I was stuck in Little Rock...sheesh.