Re: Frame Building - race bike for next season

Cheap update..going with an aluminum frame. Im learning fusion 360 and will be building it in here, then prototyping with plywood.

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Re: Frame Building - race bike for next season

I was just reading about the Walwin grasstrack frames of the 70's - aluminum plate bolted together sandwich <10 lbs sans swingarm (tubular steel). Yetmans are around 8 in chromoly.

Victor Pagan had/has a Bidalot RS1 replica frame done up in aluminum - you could look at a machine like that or the peugeot xg3 for ballpark geometry and scale.

a single plane box section seems to do the trick too. Foale made some cool spine frames.

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Re: Frame Building - race bike for next season

man that is a cool frame. I wonder if Victor still has that aluminum frame. It was for sale when he was getting out of the game.

Re: Frame Building - race bike for next season

Dirty30 Dillon /

I seem to recall a Mass guy buying it, might have been Andy Townsend?

Re: Frame Building - race bike for next season

> Dickie Thompson Wrote:

> -------------------------------------------------------

> Cheap update..going with an aluminum frame. Im learning fusion 360 and

> will be building it in here, then prototyping with plywood.

Liked.

Def coming back to this site for this thread in particular

Re: Frame Building - race bike for next season

Took a break during the holidays, and started tinkering with a stock+ class engine. Im unsure what ill be racing this on. Maybe just a stock frame. Maybe just a loaner bike.

I had this pipe from a few years back. Its for a morini. I attempted to weld it to a cast iron cylinder around 2011. That obviously didnt work, and since then ive learned more about welding.

My gila pipe header was really nice thanks to a friend and a mill. This one is thinner than id like, but very close to square, while using a drill press and a gasket.

The cylinder needed the exhaust exit port walls ground down to accomodate. That took the majority of the time.

It is not finished. I need to weld spring retainers and decide how I will mount the stinger/baffle.(edited)

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Re: Frame Building - race bike for next season

Those little shitters don’t even need a baffle. Especially if it’s just gonna be a track bike.

Re: Frame Building - race bike for next season

> Daniel '' Wrote:

> -------------------------------------------------------

> Those little shitters don’t even need a baffle. Especially if it’s just

> gonna be a track bike.

Baffles are required on the track. And I already have the baffle so I may as well use it

Re: Frame Building - race bike for next season

I don't get the "must have silencer" rule. With a full face helmet you can barely hear anything anyway. I mean, if you're running a megaphone exhaust like the old days before xchambers I could imagine it pissing people off, but a loud bike on a track is just... Normal.

My center bleed pipe with no silencer is quieter than almost every bike with a muffler.

Re: Frame Building - race bike for next season

> baird co Wrote:

> -------------------------------------------------------

> I don't get the "must have silencer" rule. With a full face helmet you

> can barely hear anything anyway. I mean, if you're running a megaphone

> exhaust like the old days before xchambers I could imagine it pissing

> people off, but a loud bike on a track is just... Normal.

>

> My center bleed pipe with no silencer is quieter than almost every bike

> with a muffler.

Yea the center bleed is very quiet. A 6" narrow stinger on any kitted bike would be loud though.

Finished the spring mounts this morning..

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Re: Frame Building - race bike for next season

sweet!

is that still steel fill rod? - silicon bronze is the way to go on thin stuff and will reduce the opportunity for that undercutting to develop.

Re: Frame Building - race bike for next season

> jumpsuit steve Wrote:

> -------------------------------------------------------

> sweet!

>

> is that still steel fill rod? - silicon bronze is the way to go on thin

> stuff and will reduce the opportunity for that undercutting to develop.

yea, i could have brazed it too. I decided to weld it for practice tbh.

I'm building an exhaust for my 1989 e30 bmw and needed to get warmed up.

Re: Frame Building - race bike for next season

https://instagram.com/mikey.antonakakis?igshid=n2hjf7fgyz15

This dude just made a turbo exhaust manifold for his bmw. Came out pretty sick.

Re: Frame Building - race bike for next season

> Daniel '' Wrote:

> -------------------------------------------------------

> https://instagram.com/mikey.antonakakis?igshid=n2hjf7fgyz15

>

> This dude just made a turbo exhaust manifold for his bmw. Came out

> pretty sick.

Thats really nice. I'm keeping mine NA with the stock engine. Its chipped and has a k&n, and cat delete. I have long headers on mine. I have the 325ix, so AWD, 67% pwr to the rear wheels. 5 speed swap. Mtech package but ive stripped the interior and will be making a B pillar brace for 5 pt harnesses.

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Re: Frame Building - race bike for next season

/\ very nice!

Re: Frame Building - race bike for next season

Well the pieces are coming together.

Ty Lou for swinging the arrow parts my way for a killer deal.

I'm getting into the mock up stage. I picked up some plywood to build the plate frame out.

I'm making these motor mounts to compensate for the front motor mount. It has a 22mm offset.

The challenge will be the clutch side. The drive side is easy, as long as I account for the chain line I should be all set.

Also, i may have to lengthen my single sided swingarm. From the factory its incredibly short.

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Re: Frame Building - race bike for next season

Please spend some time making the wheel adjuster not garbage on this. By far the biggest bummer about the arrow/racing to. I think a ds50 swingarm and wheel would have been a better choice for simplicity’s sake. But man, a single sided swingarm with a mono shock is gonna be sick. Matching wheels is a plus too. They also make some really good 12” race tires too, so that’s a pretty rad advantage of having arrow sized wheel.

Re: Frame Building - race bike for next season

> Daniel '' Wrote:

> -------------------------------------------------------

> Please spend some time making the wheel adjuster not garbage on this. By

> far the biggest bummer about the arrow/racing to. I think a ds50

> swingarm and wheel would have been a better choice for simplicity’s

> sake. But man, a single sided swingarm with a mono shock is gonna be

> sick. Matching wheels is a plus too. They also make some really good 12”

> race tires too, so that’s a pretty rad advantage of having arrow sized

> wheel.

Yep. That snail and double bolt is nonsense and absolutely a headache for a race bike.

Anything I do there ill include specs and a file.

Re: Frame Building - race bike for next season

Mock up taking basic shape.

After talking with some friends I have a gameplan for the swingarm. Sleeve and extend 2-3 inches, notch the snail to avoid slip, and use a cam on the swingarm thru bolt and frame.

My swingarm and forks will be waaaaay heavier than my frame.

More to come

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Re: Frame Building - race bike for next season

Getting some geometry and mock up going

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Re: Frame Building - race bike for next season

Cristian Luna /

I love this it’s exactly what I wanted to do with a derbi furax I just didn’t have the cash when it popped up . I rode a mini moto set up xr100 last year and that thing is a blast I’m building my racebike to hopefully feel similar to that

Re: Frame Building - race bike for next season

This is the plate shape. Seat stays will be bolt on.

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