Topica Loopframe_Guzzi Archive


Subject: Re: B-10 cam/Loop Performance

Author: Darrell J Dick

Date: May 18, 2005, 8:25 AM

Post ID: 1718885803



Sounds like you need a Convert tranny. That is one of the things that I
think the auto trans does really well. Just whack open the throttle, and
it winds up and goes.

Darrell Dick
Imlay City, MI

On Wed, 18 May 2005 15:03:55 +0000 joe jump <jum-@hotmail.com> writes:
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Sorry about the double post - hit the wrong button!

I think Megacycle makes cams for Guzzis, but they're pretty proud of

them too, like in the $350 arena.

I've been riding and building bikes for quite some time - Nortons,
Ducatis, BMWs, and now Guzzis. My loop Junkyard (850T powered
Ambo)is
the first loop I've owned, but I rode a '74 LAPD from St Louis out
to
Mid-Ohio a couple years ago. I also had a '73 V7 Sport for a few
years.
I think I'm qualified to make this statement...

These old Guzzis are dogs, especially on the top end!

Both my 750 Norton & my R75/2 Conversion will eat Junkyard alive on
a
top gear roll-on; my V7 Sport was the same way.

If I'm at, say 70 mph (indicated) 4200-4300 rpm in 5th, on the
interstate, I'll grab a handfull of throttle and about 10 seconds
later
I'll see 4500/4600 rpm - lots of intake noise but no punch. It acts
like
it's over loaded, like it's geared way too tall(all stock), or it
falls
off it's torque curve at 4500 rpm. It will slow down noticably on
easy
interstate grades which require a significant increase in throttle
to
maintain speed - can't imagine what it would be like with a
passenger!
I recently added a windshield (barn door) which has made it a bit
worse
but not much. I've done all the easy stuff by the book-valves are
adjusted, timing is set, carbs are jetted, plug chops, K & Ns,
intake
stacks, stock and modified exhaust, etc. It compares to the other
older
Guzzis I've ridden/owned/run with. At Mid-Ohio last year I rode with

Corntown from Indy to Ohio and and a third loop back & forth to the

track. Naturally there were times when we whacked open the throttles
to
see who was faster, and I wasn't ever last. I've even tried the
weight
loss aproach (presently down 20 lbs) with no discernable
improvement,
bike or phisique! That's just all there is, and it sucks!

On the positive, it is the smoothest riding bike I have ever owned,
and
I absolutely love the looks and the design. I'm not ready to walk
away
yet.

So what to do? I want more power, especially more torque in the
4000/6000 rpm range. Where to look? Bigger bore, carbs/intake, the
heads, the exhaust, the camshaft, and the ingition curve. I want to

build an engine that runs!

Of course, I need to start this process by putting what I have on a
dyno
to see what's there. I'm afraid it won't be too impressive.

I would like to start a thread on performance. Please feel free to
participate. Let us know what your experiences are, any tuning
secrets,
sources for go-fast parts, etc. Sure beats talking about the pie you
ate
at the hole-in-the-wall diner you stopped at on your ride to the
rally.

Not trying to insult anybody, just trying to get some answers, which
I
believe are hiding here on the list. There is more experience here
than
any other place I have access to.

Thanks for your time!

Joe in St Louis
850T-Powered Ambo
"Junkyard"

Robert Johnson wrote:
 
 by the way thanks for the negative response on using convert
cam in an
 
 
850 eng dave recommends a b10 cam but since I have the other it
will be
 
used and save the 500

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