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Bike for dirt drags with 13B NA

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Old 01-05-11, 07:45 PM
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Bike for dirt drags with 13B NA

The following link will take you to the first stage of my build thread " port valves " was done with still pictures the next stage the bike build will be done in video I will also be doing a video on how to wire a first gen dizzy to second gen coils and ignitors www.rx7club.com/showthread.php?t=928769
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Old 01-30-11, 12:00 PM
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Video #1.. Bike for dirt drags with a 13b rotary

I am still waiting on my new camera so the one I am using will have to do for now .. I did manage to put together the first of a series of short movies on my bike build .. Much harder putting a movie together than one might think but seeing as this is the first please bear with me I hope things get better as I go along .. Hope everyone enjoys it and if anyone has any good info on my project please feel free to make a comment, I always look forward for new info.. Hope you enjoy I have made an effort to not make them too long http://www.youtube.com/watch?v=5SF5-7tPSm8
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Old 02-01-11, 01:05 PM
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Video #2 bike for dirt drags with a 13b rotary

# 2 video is about machining a brake pin for the rear brakes on the bike ,also a new rear axel assembly and some shots of some of the different parts that I will be using after I modify them .. Again please feel free to make any comments.. I hope you enjoy http://www.youtube.com/watch?v=esMor6W3kCI
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Old 02-01-11, 03:05 PM
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How are you planning on mounting into the frame, across with a bike style gearbox and chain drive or front to back with an auto box with a shaft drive.?

Interested in your progress mate
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Old 02-01-11, 03:56 PM
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the numbers stamped on the rotor housings are reference numbers stamped on by the shop that mazda had remanufacture their engines at the time that the engine was built.

nice videos, i like the detail and methods using basic tools which shows you don't need expensive machinery to make things still.

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Old 02-02-11, 08:56 AM
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Originally Posted by Dualist View Post
How are you planning on mounting into the frame, across with a bike style gearbox and chain drive or front to back with an auto box with a shaft drive.?

Interested in your progress mate
My goal for 2012 is a cross mount with a racing clutch from a high HP snowmobile 250 to 300 HP. range and then run a jack shaft ,but for this year I will run it in line .. with a auto trans. The bike I am using is a shaft drive so I will just run a jack chain from the rear of the trans to the shaft drive .. I have done it before with a v8 engine but it created a fair amount of side draft .. I am hopeing the rotary will be a little easier to control .. No one in my area has built anything for me to compete against but for sure after the 2011 season some one will .. that is when the cross mount will appear .. Things get a little tense about half track with an inline set up but that is all that is in my fun money budget for this year .. So this year I am just trying to tease some of the guys to build a bike for dirt drags instead of using their street machines and it seems to be working .. Thanks for the interest
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Old 02-02-11, 09:19 AM
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Originally Posted by Karack View Post
the numbers stamped on the rotor housings are reference numbers stamped on by the shop that mazda had remanufacture their engines at the time that the engine was built.

nice videos, i like the detail and methods using basic tools which shows you don't need expensive machinery to make things still.
Yea I figured that is what the numbers were all about .. This year I am trying to keep things affordable so it will be a fairly easy and simple build . Not to much money spent on looks .. I notice that some of the guys spend a large amount of coin on their projects in the forum ..But in the end many of them still don't know much about their machines because someone else did the work for them .. I have grown fond of the little rotary engines and already have a couple more projects in mind .. even when I was a kid I had projects on the go that just made my buddies shake their heads .. Sometimes I guess things don't change much they are still shaking their heads .. I can't imagine following the normal path I have always been on the side making my own path.. thanks for the interest ..
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Old 02-02-11, 09:50 AM
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The extra tab on the bottom of the water pump housing is for the emission air pump bracket. Since your not running one it's not a big deal.
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Old 02-02-11, 10:25 AM
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Originally Posted by KansasCityREPU View Post
The extra tab on the bottom of the water pump housing is for the emission air pump bracket. Since your not running one it's not a big deal.
Thanks KansasCity I figured it was something simple but who knows ..I went out and had a look at my other 6 port and it is the same also .
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Old 02-08-11, 10:53 PM
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10:00 min. on frame build and some frame straightening 101

Just some basic frame building and taking a twist out of the rear fender frame Remember things only get complicated if you let them - Have a good one ,, http://www.youtube.com/watch?feature...&v=fsEgrtzeOaw
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Old 02-08-11, 11:04 PM
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in west aus there was a homemade supercharged 13b trike that got banned from the dirt drags cause it set fire to a competitors eyebrows back around 01
( i am serious )

the supercharger was a massive switzer turbo compressor mounted off a ball gear drive from the water pump snout
--- a marvel in itself

the engine was rx4 13b bridgeport , the gearbox an auto 4wd subaru leone gearbox with 2nd gear removed
( using the front wheel output shafts to VW baja balloon wheels )

sorry no pics
,,,,, but i do know where the trike is now ( and 4 sale ) so if i come across it again i will take some
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Old 02-08-11, 11:04 PM
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Originally Posted by gerald m View Post
Yea I figured that is what the numbers were all about .. This year I am trying to keep things affordable so it will be a fairly easy and simple build . Not to much money spent on looks .. I notice that some of the guys spend a large amount of coin on their projects in the forum ..But in the end many of them still don't know much about their machines because someone else did the work for them .. I have grown fond of the little rotary engines and already have a couple more projects in mind .. even when I was a kid I had projects on the go that just made my buddies shake their heads .. Sometimes I guess things don't change much they are still shaking their heads .. I can't imagine following the normal path I have always been on the side making my own path.. thanks for the interest ..
you don't have to tell me what it's like, i'm half german and have my own roots into the motor and building things from scratch with homemade tools, it makes it more challenging and fun to make things with your own hands and show people that it works.
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Old 02-09-11, 01:44 AM
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Originally Posted by bumpstart View Post
in west aus there was a homemade supercharged 13b trike that got banned from the dirt drags cause it set fire to a competitors eyebrows back around 01
( i am serious )

the supercharger was a massive switzer turbo compressor mounted off a ball gear drive from the water pump snout
--- a marvel in itself

the engine was rx4 13b bridgeport , the gearbox an auto 4wd subaru leone gearbox with 2nd gear removed
( using the front wheel output shafts to VW baja balloon wheels )

sorry no pics
,,,,, but i do know where the trike is now ( and 4 sale ) so if i come across it again i will take some
This dude got **** to but they didn't run him off it's a 13b .just look at the crap he blows in this poor bastards face ,,It don't matter how many times I watch this i still my *** off ..I have seen a vid or two with the back bumper burning on these 7's too I hope mine blows fire too ,in fact I will be disappointed if it doesn't http://www.youtube.com/watch?feature...&v=zqGsYiIWq3w
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Old 02-09-11, 02:10 AM
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Originally Posted by gerald m View Post
This dude got **** to but they didn't run him off it's a 13b .just look at the crap he blows in this poor bastards face ,,It don't matter how many times I watch this i still my *** off ..I have seen a vid or two with the back bumper burning on these 7's too I hope mine blows fire too ,in fact I will be disappointed if it doesn't http://www.youtube.com/watch?feature...&v=zqGsYiIWq3w
northam is in my home sate in australia ,, i wonder if that is neil
( owner of the trike )
note the nitro harley at northam vid listed with that one isnt even close
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Old 02-09-11, 03:21 AM
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Originally Posted by Karack View Post
you don't have to tell me what it's like, i'm half german and have my own roots into the motor and building things from scratch with homemade tools, it makes it more challenging and fun to make things with your own hands and show people that it works.
I just want to get this one built for summer then next winter it will be a cross mount rotary with maybe a port job I would love to take a crack at that. I have another 13b 6 port that I want to check out .. it had no compression on one rotor and I think not much on the other , But I haven't checked anything but I know it needs work ..
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Old 02-10-11, 10:35 PM
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Originally Posted by bumpstart View Post
northam is in my home sate in australia ,, i wonder if that is neil
( owner of the trike )
note the nitro harley at northam vid listed with that one isnt even close
I don't know who that is but I would like to have a chat with him if you ever find out I have been trying to find a email or something but no luck so far ..He's not sparing any ponies either, that is about all that machine can take without heading for the cherry bushes .. My hat is off to him that is not the first time he did that
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Old 02-11-11, 04:19 PM
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AK

Mr Gerald, do you have any ideas what snow machine clutch you would run when you get to that point?

I know you said "a racing" clutch, do you have a specific brand or shop in mind?
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Old 02-11-11, 05:23 PM
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Originally Posted by Nexxussian View Post
Mr Gerald, do you have any ideas what snow machine clutch you would run when you get to that point?

I know you said "a racing" clutch, do you have a specific brand or shop in mind?
No, I don't know what I am going to do for sure or even if that kind of set up can take the abuse .. But I don't see why not ,guys head to the mountains with 200 to 300 hp snow-sleds and they seem to survive .. I just like the idea of smooth power transfer without using a gear box of some kind .. Never know I might like the one I am building and just go bigger, better and wider in the rear for a nice wide dirt tire. I think chain drive also then you have the option of more ratios for drive sprockets.. Why do you ask ? Please feel free to make a comment I am always open to reasonable suggestions . Or even unreasonable if they might work . Being from Alaska there is a good chance you know lots about snowsleds. Thanks for your interest .
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Old 02-12-11, 10:11 PM
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AK

I've been looking at using a variable ratio setup of one form or another for 20 years or thereabouts, always on different stuff.

Only recently has there been enough development in the aftermarket to make it potentially readable (IMHO anyway).

I've been looking at the Rage series of primary and driven clutches, I just have to figure out how I'll attach them (while retaining a starter, and a driveshaft ).

I'm not drag racing, so the initial hit off the line won't be as harsh, I expect that's what kills those.

Last edited by Nexxussian; 02-12-11 at 10:35 PM. Reason: too many 'boots & damn you autocorrect
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Old 02-12-11, 11:22 PM
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A few years back I built a pay out winch for hang gliding with a 440 snow jet ( OLD SCHOOL STUFF ) I could also use it for training purposes .. It had 7000 ft. of 3/16 spectra ( 1200 ) lb. test great stuff no stretch with a 4 cell parafoil kit with a 12 inch drogue behind it to keep the parafoil from going wild at high speeds .. I could launch a 250 pound man ,harness and glider out in a field with the winch stationary no problem .. about half pulley it use to slip a tad but not enough to cause problems .. To tighten the line on the drum I use to pay out most of the line, tie it to a good post and pull my van backwards ,that got it real tight ( it was mounted in the back of a 77 gmc stx rally van with no rear roof in it for payout towing.. I could tow them up with no problem to 3000 - 4000 ft. and when they released I would start the machine and bring the line in . ( that is what the parafoil kite was for ,to keep the line from touching down when I brought it back in to the van.. It had the snowsled speedo on it and it was easy to bring the line in at 50 - 60 mph... Guys use to look at it for a long time and I don't think many of them really understood how the dam thing worked they just wanted another tow , It was great fun.. I built a level wind put a cover on it and never did show anyone how it worked it had a brake set up using a gm. disc brake on one of the jack shafts to control pay out speed and line pressures . I built lots of **** like that .. I still got it , If you like I can take a short vid and put it up so you can see how it works .. might give you a few ideas .. It never slipped on start up at all it was a half sheave when they were both the same size I would guess it was producing max torque there .. So what is your project I won't tell anyone HONEST know one ever reads my threads

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Old 02-19-11, 12:19 AM
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Shock actuators to operate port valves

Well the question is there .. Was just wondering if it would be possible. Seeing as the shock actuators rotate either way why couldn't they be attached to the port valve actuator rods wire them up to operate one cw the other ccw,, then they could be controlled to open at any rpm and with the proper switch, the speed they open or even how far they open could be controlled. Do they have enough power to do the job? Sorry for being so off center, I just can't help it I like things that are different ,,
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Old 03-13-11, 04:40 PM
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15:00 minutes on machining and drilling a simple spacer bushing to replace the old mono shock system http://www.youtube.com/watch?v=w5_F4miJSrA
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Old 03-13-11, 04:45 PM
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14.47 minutes on frame build , welding , pipe bender . The frame I started just wasn't wide enough to accommodate the rotary engine properly so I cut part of it and made it 2 inches wider to help make the bike easier to balance at low speeds .. The bike has grown to about 10 ft. long some say it will be easier to handle some say it will be harder to handle.. my experience with bikes tells me that the rake or (angle) of the front end will determine how it handles along with how low the center of gravity is .. http://www.youtube.com/watch?v=j7JNJXrkgLY
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Old 03-15-11, 10:32 AM
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You fast forwarded the good part! How did the pipe bender work out? I have a similar unit from Princess Auto, just without the air cylinder. Bought it for exhaust tubing then found out the dies are for pipe.
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Old 03-16-11, 12:32 AM
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Aaron I never thought anyone would care how it worked so I buzzed through what I figured would be considered boring .. I didn't work to bad for my first go with it . I love the air over hydraulic ,one of the main reasons I never showed it all was because my compressor is so loud it would drive everyone nutty.. I need to go for some pipe supplies so when I am ready to do some more bending I will do a video on just that .. I will drag that dam compressor out in the entrance so it doesn't bother the sound on my camera.. I consider that a small effort for someone that has helped me out as much as you have .. Have a good one and take care.. Gerald
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