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V7 III 820cc Big Bore Kit

Discussion in 'V7/V85/V9 Chat & Tech' started by GT-Rx®, Jul 13, 2017.

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I...

  1. Love this and plan on doing it to my V7 III

    19 vote(s)
    82.6%
  2. Am content with stock power

    4 vote(s)
    17.4%
  1. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    We just got the new GTM CNC forged weight matched 820cc pistons. These are drop-in, meaning no crank re-balancing required. Dyno info posted below.
    We'll try to keep a set in stock. Click on the pic below or HERE. Yes this will require my ECU Flash Tool for a corrected map, or if you have purchased one already, map update is free with piston purchase from us.
    You can have your cylinders bored and re-coated yourself, or I will try to offer a core exchange at additional cost of course.
    Porting: For those who have asked, unlike the heron heads, the stock Mk III hemi cylinder head casting/porting is actually quite good, and not worth any effort to try and maximize them. Not saying small gains can’t be had, but cost wouldn’t be worth it... point of diminishing returns.
    Contact me direct for more info direct email; Info at GuzziTech.com

    Forged and weight matched 820cc piston on left, stock cast on right:
    [​IMG]

    Dyno graph below... Same bike, bone stock 749cc (green tracers) vs. GTM 820cc (blue tracers). Both are with stock exhaust and small amount fuel tweaking.

    [​IMG]
     
    DK-V7classic likes this.
  2. gyrorex

    gyrorex Tuned and Synch'ed GT Famiglia

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    Todd,
    Do you have those for the older, Herron head V7's as well?
    Thanks, Rex
     
  3. TimmyTheHog

    TimmyTheHog Cruisin' Guzzisti GT Contributor

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    2nd this...

    more power!!!! as Tim the tool man Taylor would grunt at it...
     
  4. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Poppe and TimmyTheHog like this.
  5. TimmyTheHog

    TimmyTheHog Cruisin' Guzzisti GT Contributor

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  6. Stradagene

    Stradagene Cruisin' Guzzisti GT Famiglia

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    Ooh!

    If you have a V7/V7II and you really want some power, and if you're coming down to California to have Todd do the installation, you should consider the 820cc-Quattrovalvole kit!

    I would wager that the 820cc-Quattrovalvole kit delivers more power and torque than even the new 820cc kit for the V7III, but Todd only sells the 820cc-Quattrovalvole kit with installation by Guzzi-Tech. The advantage of the drop-in 820cc kit using the stock 2V Heron heads is that Todd sells those for your own installation, but if you're already thinking of coming down for a drop-in 820cc big bore kit installation...
     
    BENITO, TimmyTheHog and GT-Rx® like this.
  7. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Going together.
    820 piston in, stock below.

    IMG_1641.JPG
     
  8. Trout

    Trout GT Reference

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    I wanna see the dyno.
    I wanna ride that bike.
     
  9. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    I have most of the info posted on this thread; https://www.guzzitech.com/forums/threads/gtm-v7iii-racer-820r.17698/ -- everyone who has ridden it has been impressed.

    Dyno graph below... Same bike, bone stock 749cc (green tracers) vs. GTM 820cc (blue tracers). Both are with stock exhaust and small amount fuel tweaking. With our full stepped header exhaust system, you'll have another 5% or so.

    [​IMG]
     
    T_Guzzi, Tequilasunriser and BearV7 like this.
  10. lucydad

    lucydad Cruisin' Guzzisti GT Famiglia

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    Impressive indeed
     
  11. racer-7

    racer-7 Just got it firing!

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    I don’t write reviews, but this time I had to--it’s that good.
    I am an engineer with 15 motorcycles—3 guzzi’s--and I have a knack for finding faults but I can’t find a fault with this set up. It’s perfection!

    I installed this mod on my V7-3 racer--GTM V7 820 Big Bore, GTM GP Exhaust and the GTM ECU Flash. Everyone knows the V7 is a fun bike, but with this upgrade it’s fun squared. Every twist of the wrist is happiness and satisfying. The throttle response is spot on. The power curve is straight and true. The monster torque is present everywhere. The sound of the GTM GP exhaust sound--ahhh the sound--is addicting.

    I would like to thank Todd Eagan and his crew for their support and his passion for the Moto Guzzi brand. It’s really impressive what GTM does with these wonderful V-twin motors. Todd and his crew really know what they are doing. If you want to experience the passion and true performance of these wonderful engines, this is one of the mods.

    Thanks Todd and GTM Crew
     
  12. Owen Liu

    Owen Liu Just got it firing!

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    Hi Todd, I'm a little confused on what is in the kit.

    From the description in the store, it says: Kit includes pistons, all rings, wrist pins and new larger bore metal top end gaskets and OEM base gaskets.

    Particularly I was confused about: new larger bore metal top end gaskets and OEM base gaskets.

    Are these just gaskets? How does it work with the need for a larger piston sleeve to work with the larger pistons? You have to machine them at your local shop?

    Thank you.
     
  13. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    We had larger head gaskets made originally, but we now supply them as OEM both top and bottom thanks to the V9.
    The cylinders need to be bored and re-nikasil'ed, as well as re-powdercoated (the chemical process for the nikasil destroys the external black coating). This is a service we offer if you want to send your cylinders to us. Any more info, please use email direct; Todd at GuzziTech.com
     
    Owen Liu likes this.
  14. Owen Liu

    Owen Liu Just got it firing!

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    Now it's clear, thanks for the quick response Todd.
     
  15. RAYT

    RAYT Tuned and Synch'ed

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    Just got my bike back from GT with the 820 Big Bore Kit installed. The Dyno on this thread above shows exactly what you will get and more. Todd and his crew really know what they are doing. Quick and easy service.
    I feel more confident knowing the bike will get out of its own way when I hit the throttle. It just keeps pulling.
    I did my research and talked to other guys who had the kit on their bikes and I was convinced to upgrade.
    I plan on keeping my bike so it was a no brainer for me. I commute on this bike and take it in the hills on longer weekend rides too.
    Added bonus if you have an upgraded exhaust, you will notice a throatier Guzzi exhaust note too!
    The bike is much safer and more fun to ride with this kit - thumbs up!
     
    GT-Rx®, luigi57, BadAndy and 3 others like this.
  16. chrisk

    chrisk Tuned and Synch'ed

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    I know this has been asked a 1000 times, and the general answer is that it’s not worth the time or money, but after riding the bike last weekend I really want to know if there’s any decent gains to be had with some head work?

    I already have Leo Vince pipes and a re-map which gives 53hp, so wondered if anyone has experience of trying to squeeze more power out with the new head design?

    I’m of course waiting for a v85 engined roadster, bit in the meantime a bit more power would go down
    nicely.
     
  17. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Chris, well covered here. You have to search and read. Heads are about as good as they get. Not saying a little more can’t be had, read above. Big bore is the best option. I’ve combined your question with this big bore thread. Read from the top.
     
    chrisk and Mayakovski like this.

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