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Thread: ESE's works engine tuner

  1. #27886
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    10th January 2016 - 12:35
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    Quote Originally Posted by F5 Dave View Post
    One might be tempted to bore out the iron. Weld in super generous ally bridge and slide a accurate sleeve in place maybe of ally then grind sparingly allowing for relief on the bridge before and after plating it as still will be crappy heat transfer in a very hot position. You will be water cooling them of course . .

    Never tried it but in same position on bucket I chose to bore triple port so cast in steel connected to ally as stock and allows for thicker bridge between ports.

    Of course with skinny through hole retained barrels these ports can be difficult but some alternative engineering can sidestep the original constraints some of which have been posted before.
    Thats a good point on heat build up on the bridge. The thing I was hoping to pull off was putting a bridge in some older air cooled cylinders (Aluminum casting with iron sleeve) on my vintage race bikes that are single ext port. Maybe weld in a hand fitted aluminum bridge piece, slightly relieve the bore surface and have the whole thing nikasil plated?

    I know they make several bridged air cooled moped cylinders, but these are all aluminum units.

  2. #27887
    Join Date
    12th March 2010 - 16:56
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    Quote Originally Posted by Tbh37620 View Post
    Thats a good point on heat build up on the bridge. The thing I was hoping to pull off was putting a bridge in some older air cooled cylinders (Aluminum casting with iron sleeve) on my vintage race bikes that are single ext port. Maybe weld in a hand fitted aluminum bridge piece, slightly relieve the bore surface and have the whole thing nikasil plated?

    I know they make several bridged air cooled moped cylinders, but these are all aluminum units.
    Consider casting new cylinders with bridges.

  3. #27888
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    20th January 2010 - 14:41
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    husaberg
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    Quote Originally Posted by WilDun View Post
    Yes, I used to wonder why Suzuki used that layout on the T500, but in hindsight it was good design. BTW I remember when it was first sold in the US it was advertised as being "The world's first 500cc Dual Stroke"!
    Attachment 333586
    Alfred Scott might have beat them by 50 odd years to that one.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  4. #27889
    Join Date
    19th October 2014 - 17:49
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    whatever I can get running - dirt/track/
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    Here's a photo of Jeff Henise's TZ350 cylinder with added bridge from his LSR project done with wobbly's guidance.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  5. #27890
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    8th February 2007 - 20:42
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    TZ400
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    I have done a couple of air cooled cylinders, that had iron liners.Welded in a bridge, honed the thing true then dropped in an alloy liner.
    This makes it possible to fully weld the liner in around the top, and then down both sides of the bridge to get good heat transfer.
    I also welded around the junction of the transfer ducts and the bore edge, ensuring that the liner stayed true.
    Once the porting was done, it was then plated, still running many years later.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  6. #27891
    Join Date
    18th May 2007 - 20:23
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    RG50 and 76 Suzuki GP125 Buckets
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    Auckland
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    Last Sundays 2017 40 lap and 2 hour race at Mt Wellington (run anti clock wise this year).

    In the morning before racing started I went looking for the two strokes. There were very few this year.

    Click image for larger version. 

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    Scott had Team GPR's remarkable 2T Kawasaki based 125cc air cooled bike there. Scott is the man behind the Team GPR bikes.

    Quote Originally Posted by TZ350 View Post
    More pictures of Team GPR's 125 2T build. The full GPR125 story can be found here as well as lots of great videos of Bucket racing:- http://www.kiwibiker.co.nz/forums/sh...am-GPR/page134
    Click image for larger version. 

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    88 another 2T was the winning bike last year, and the hot favorite for this year.

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    Sharn was there with her air cooled Suzuki GP125 that she had done all the porting on herself.

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    There are always new and old faces at the 2 Hour, it was great to see Ollie and his mates back, I enjoyed chatting with them about their bikes.

    In the 2 hour there was drama, carnage and a black flag or two.

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    The gamest rider in the 2 hour probably had to be Jessie who fell off, got knocked off and once became the meat in the sandwich. every time he got up, the pit crew straightened the bike and he got out there again.

  7. #27892
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    18th May 2007 - 20:23
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    Auckland
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    2017 40 lapper and 2 hour - 2

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    A trip around the pits found some interesting bikes like this old school Honda twin, these were dominant before the Suzuki FXR150's took over.

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    There were plenty of clever ideas like this small light weight tank idea on a Suzuki FXR150.

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    KTM150, with a pressure feed plain big end bearing these have big potential for development as they are not RPM limited by the big end bearing like the FXR and Honda engines are with their roller big ends.

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    Honda CBR150, out of the box, un modified these engines are very competitive.

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    Yamaha 150 engine powered special with home built chassis. It was the eventual 2 hour winner.

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    Suzuki FXR150 engine in a GPR frame. Suzuki FXR's are by and way the most popular Bike for Buckets.

  8. #27893
    Join Date
    18th May 2007 - 20:23
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    Auckland
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    2017 40 lapper and 2 hour - 3

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    Team ESE's star rider did us proud and brought home a podium finish in the 40 Lap race.....

    40 Lap placings were ... David Millington, Will Ford. Sharn Steadman.

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    The KTM out on the track during the 2 Hour, it eventually came in, in second place.

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    88 set the fastest Super Pole and fastest lap during the 2 Hour race but was struck down by bad luck.

    There was a lot of full contact racing between the front runners and his exhaust was damaged in one of the collisions. The bike was black flagged for excessive noise and after attempts at a temporary repair had to eventually retire with a broken exhaust stinger.

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    Regan fettling the KTM.

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    Paul and Dylon getting the Yamaha 150 special ready.


    2 Hour Paul and Dylan, Regan and Nick, Hayden and Alex.


    More 2Hour photos:- https://amcc.org.nz/news/2017/11/29/...-bucket-2-hour

    Mylaps: ttps://speedhive.mylaps.com/Events/1483131

    Photos from Paul Bryne: https://www.facebook.com/media/set/?...0469136&type=3

    More Bucket racing photos on Chris Cains Flicker page:- https://www.flickr.com/photos/sonscc...57652099920135

    AMCC Bucket racing gallery:- https://amcc.org.nz/bucket-racing-gallery

  9. #27894
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    27th October 2013 - 08:53
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    if using a iron sleeve, be sure all welding is finished before the new sleeve is installed, if at all possible. I made the mistake of welding on a iron sleeve Honda cylinder and before I realized what happened, the cyl had pulled away from the sleeve which left a large gap. the cyl was useless after that unless I were to install a new sleeve. if a aluminum sleeve is used and welded in, then im sure you could weld at any time down the road with little risk of the cyl pulling away, although I wonder if it could still pull away in the center portion ? still, care should be taken as the sleeve bore diam can become distorted (especially the small bridges between transfer ports) and need rebored

  10. #27895
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    7th September 2009 - 09:47
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    Yo momma
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    Podunk USA
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    Quote Originally Posted by TZ350 View Post

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    There are always new faces at the 2 Hour, it was great to see Ollie and his mates back, I enjoyed chatting with them about their bikes.
    Do you get a punch in the face if you beat them?

  11. #27896
    Join Date
    24th April 2016 - 19:07
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    2001 zx9
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    bop
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    Hypothetically... lets say your have two cr 125's - one runs the crank forwards and the other backwards. all necessary engineering details have been taken care of so the main difference remaining is the thrust side of the piston becomes the exhaust side and the reed valve now "looks" at the crank surface coming toward it...what (if any) differences in engine life and power would you expect?

  12. #27897
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    8th February 2007 - 20:42
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    TZ400
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    Many variables to take into account.
    If the cylinder is reversed, the straighter pipe will make more power, maybe 1.5 Hp.
    Jan did the test with a kart engine of reversing the rotation, and even with the crank shrouds in place the difference was again about 1.5Hp
    in favour of the crank spinning away from the intake flow.
    The thrust face makes no difference - I tested that on the BSL.
    The TM kart engine has an area cut away opposite the intake that allows flow from the spinning crank to " escape " up under the piston and toward the transfer entry, this idea again made about a Hp.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  13. #27898
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    24th April 2016 - 19:07
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    2001 zx9
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    bop
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    Thanks, wobbly . the surface of the crank is doing about 200 kph so i suspected there would be an effect... if the crank wheels were fully shrouded by the cases so the reeds didn't "see" the crank at all surely that would be a big help... the exhaust side of the bore likely wouldn't be as slippery for a piston thrust face as the inlet side but that might not have any noticeable effect - plenty of engines live like that.

  14. #27899
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    25th March 2004 - 17:22
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    I did a few 2hrs. Great races. I mounted an air horn (pump up canister) one year. Scares the shit out of back markers and isn't in the rules.
    Don't you look at my accountant.
    He's the only one I've got.

  15. #27900
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    18th May 2007 - 20:23
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    Auckland
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    Quote Originally Posted by F5 Dave View Post
    I did a few 2hrs. Great races. I mounted an air horn (pump up canister) one year. Scares the shit out of back markers.
    ............

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