Moto Guzzi V7 Classic Streetbike Surgery — Motorcyclist Magazine

14 Июн 2015 | Author: | Комментарии к записи Moto Guzzi V7 Classic Streetbike Surgery — Motorcyclist Magazine отключены
Moto Guzzi 850 T

The Littlest Goose Learns to Fly

Guzzi’s V7 Classic is a predictable that proves you don’t 100 horsepower to have fun on backroads. a little more power is welcome!

Moto Guzzi’s V7 is a predictable handler that you don’t need 100 horsepower

“My has more power,” said our “A” technician. He wasn’t kidding: His old KLX650 churned out 45 rear-wheel on our shop’s Factory Pro dynamometer. Our Moto Guzzi V7 Classic, by made a paltry 38 horses in of its additional cylinder and 100cc advantage. Shame is a powerful

At that moment, I decided to a fire under the little tail feathers.

Moto success with the V7 Classic the recently released V7 Racer, see 54) was a long time coming. The Tonti-designed small-block V-twin appeared in 1976 with the V35 and 490cc V50. Both lighter and more compact previous big-block Guzzis.

Displacement grew to 650cc, 750cc in the ’80s when development halted.

A current V7 tips the scales at just 400 lbs. with all vital its svelte form invoking the V7 Sport and 850 Le Mans. Power however, is underwhelming. The manufacturer 48 horses, but by the time they’ve to the rear wheel, 10 have missing.

The last thing I with that little ran on hay! Luckily, I had a few tricks in to put some pep in this pony.

I some experience with Guzzis, having won AHRMA Superbike races at Daytona the four years on a V65. My weighs 320 lbs. wet and makes 55 It’s a hoot to toss racetracks like Barber and Springs.

It’s proven dependable, finishing its last 100 races. But its compression requires 110-octane race gas, and there’s no sidestand, charging system or starter. That’s great for a sprint race, but not practical (or on the street.

First, off with its Thirty minutes after the V7 home, both cylinder sat on my bench. The 750 uses Heron-style wherein the combustion chambers are into the tops of the pistons; the themselves are as flat as a Karaoke Valves have a zero-degree angle, moving straight up and

It’s a fairly obscure (Moto Morini is the only familiar brand using the but hot-rodding Herons is common We started with the same porting and valve package on my racer. Tuning guru Meyers fitted oversized valves cut from blanks.

We up 2mm on the intakes and 1mm on the exhausts for better Porting was unsophisticated: just up the head castings.

Next? and measure again: I checked clearance by placing solder on the reassembling the engine, and then it over to compress the solder. The 2mm squish screamed for attention.

Moto Guzzi 850 T

So I out my burette and measured the combustion volume: around 30cc for the with another 10cc the squish and head-gasket areas. The themselves hold zero but the valves are dished to hold Every bit counts when calculating compression—set it too high and pistons will self-destruct!

One nice feature of the V7 engine is the of increasing compression by decreasing chamber volume. No need for pistons; just machine the ones. After trimming 2mm off the of both pistons and cylinders, soared from a lawnmower-like 9:1 to which works fine high-octane pump gas.

piston ended up just a few lighter, so the crankshaft didn’t to be rebalanced.

The V7 pistons have a outer squish band. As the approach the head on compression, charge moves away the cylinder walls toward piston’s center. That charge produces good and resists detonation.

Tight squish bands are a way to build power in Heron-headed But not too tight, or pistons kiss causing catastrophic failures. I set to just under 1mm via small in the cylinder decks.

Raising decreases other clearances, and checking for valve-to-piston interference. I mine by placing clay in the chamber, assembling the engine and it over by hand. The valves close to kissing each so out came the Dremel tool a ball-end steel bit.

I cut away the offending piston to create a good 2.5mm and 1mm lateral clearance between and piston. Then I smoothed and both piston crowns a de-burring disc on my …-grinder they shone.

After double-checking my top-end a baseline run on the Werkstatt Racing and dyno told us the stock was restricting further progress. the engine inhale through throttle bodies added 2 bhp at rpm! Since dust sleeps, KN pod filters keep the out without undue restriction.

Moto Guzzi 850 T
Moto Guzzi 850 T
Moto Guzzi 850 T
Moto Guzzi 850 T
Moto Guzzi 850 T


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