Author Topic: Drag bike build questions... (Read 10140 times)

pddpimp · « **Reply #25 on:** March 03, 2009, 12:43:12 PM »

Have you ever used a line loc for the front brake? I have a left over one from the race car days, and wonder if it would be worth installing.

HavocTurbo · « **Reply #26 on:** March 03, 2009, 02:05:42 PM »

You planning on running dual or single disc front?

Line locks are ok... but if you cannot hold the front brake, maybe you shouldn't be riding?? lol. j/k.

pddpimp · « **Reply #27 on:** March 03, 2009, 02:17:05 PM »

I really haven't decided on dual or single. I have one caliper and plan on making a couple of new pistons (spares), but I'm not sure if I'd be necessary to run two. I used to run a 770hp Nova at 3250lbs with 4 wheel drum...I guess I like the thrill of guessing if I'd stop in time, or not.

I should be able to hold the brake... Strong right hand. Ya know, I have been single for a while. If you get my drift.

754 · « **Reply #28 on:** March 03, 2009, 07:36:09 PM »

78 motor has a LONGER sprocket shaft, not necessarily stronger..

Not as much longer as an offset sprocket, though..

754 · « **Reply #29 on:** March 03, 2009, 08:22:10 PM »

What are you going to use for struts?
If there is a bit of interest, I could put together a u-weld kit;

Pair upper bushings, to fit stock shock mount.

Pair Lower bushings, counterbored to take allen head bolts for stock swingarm eye mount.
"
2 pcs 3/4 x .080 wall tubing, long enough for a 6 in over arm.

pddpimp · « **Reply #30 on:** March 03, 2009, 08:53:46 PM »

Thanks for the offer on materials. But...I've already have material lying around.
3/4" .095" wall DOM and some 3/4" solid bar.

Is there any reason to make them adjustable?

Should the swing arm be parallel to the lower frame tubes?

Thanks again for all the info and offer

754 · « **Reply #31 on:** March 03, 2009, 09:08:39 PM »

Swingarm can end up wherever your ground clearance permits, plus your fork length, rake etc come into play.

I misdescribed where my wheel sits earlier. If you put a straightedge across the frame above the rear fender mounts, that is where the upper edge of my 18 inch rim is. Frame is going a bit up hill, forks are about 1.5 under, but I have run them about 3 or 4 under at the track. I cut my sidestand mount right off as I have no pipes under the frame.

I run knurled aluminum pegs on the rear peg mounts. They have a 1/2 holed bored most of the way thru. I put a stand in that hole to hold the bike up. 1/2 bar, bent at almost 90 degrees Pointing down), then a 3inch or so long piece of 1/2 inch at 90 degrees to it at the bottom, making the foot.

pddpimp · « **Reply #32 on:** March 03, 2009, 09:21:02 PM »

Quote from: 754 on March 03, 2009, 09:08:39 PM

I run knurled aluminum pegs on the rear peg mounts. They have a 1/2 holed bored most of the way thru. I put a stand in that hole to hold the bike up. 1/2 bar, bent at almost 90 degrees Pointing down), then a 3inch or so long piece of 1/2 inch at 90 degrees to it at the bottom, making the foot.

Good idea on the stand. I thought of putting the pegs in the same place. What are you doing as far a shifter and rear brake pedal?

754 · « **Reply #33 on:** March 03, 2009, 09:53:36 PM »

I may have reversed the shifter at one time, cant remember. left the brake where it was..but use rear pegs once in top gear

Geeto67 · « **Reply #34 on:** March 04, 2009, 07:37:53 AM »

Quote from: 754 on March 03, 2009, 07:36:09 PM

78 motor has a LONGER sprocket shaft, not necessarily stronger..

Not as much longer as an offset sprocket, though..

I am not 100% sure on this but I think the sprocket shaft is also thicker. I know one of the tranny shafts is thicker but I forget which one. Either way the 78 bottom end is beefier than other SOHC4s (except maybe the hondamatic).

I still say build to a class. just building a bike to "go fast" with a stock motor is throwing darts at a blank wall - yes you are accomplishing something but damn if I know what it is. Plus class rules give your project focus and direction and prevent you from doing something stupid or dangerous. Even if you don't intend to ever run it in that class, most tracks won't let you pass tech without a bare minimum of safety so having a rule book and following the general rules regarding bikes is just plain helpful. Trust me, getting turned away at the gate cause you failed tech sucks - it feels like you have wasted a whole day. most techs I know treat racebikes like racebikes and streetbikes like street bikes. If it doesn't have street gear on it expect by the book scrutiny.

754 · « **Reply #35 on:** March 04, 2009, 07:47:55 AM »

The 78 shaft has less spline on it. Explain how the bottom end is stronger? except for stronder rod bolts in a F model.

Just make sure bike passes tech anywhere, very few rules in bracket racing.

HavocTurbo · « **Reply #36 on:** March 04, 2009, 08:35:02 AM »

Quote from: 754 on March 04, 2009, 07:47:55 AM

The 78 shaft has less spline on it. Explain how the bottom end is stronger? except for stronder rod bolts in a F model.

Just make sure bike passes tech anywhere, very few rules in bracket racing.

I think he meant the bottom end of the transmission.

Here in IL you can bracket race with a helmet and full leathers. That's it.

Well..... gotta tape off all your lights and stuff, but it's easy to pass tech.

pddpimp · « **Reply #37 on:** March 04, 2009, 03:53:15 PM »

[/quote]

I still say build to a class. just building a bike to "go fast" with a stock motor is throwing darts at a blank wall - yes you are accomplishing something but damn if I know what it is. Plus class rules give your project focus and direction and prevent you from doing something stupid or dangerous. Even if you don't intend to ever run it in that class, most tracks won't let you pass tech without a bare minimum of safety so having a rule book and following the general rules regarding bikes is just plain helpful. Trust me, getting turned away at the gate cause you failed tech sucks - it feels like you have wasted a whole day. most techs I know treat racebikes like racebikes and streetbikes like street bikes. If it doesn't have street gear on it expect by the book scrutiny.

Well, I here what you are saying. I plan on building it to pass tech for sure. When I raced cars, I was sent back only once to fix something. After that, I was always triple checking everything to spec before even leaving my house.

[/quote]

pddpimp · « **Reply #38 on:** March 04, 2009, 03:59:30 PM »

Quote from: HavocTurbo on March 04, 2009, 08:35:02 AM

Quote from: 754 on March 04, 2009, 07:47:55 AM
The 78 shaft has less spline on it. Explain how the bottom end is stronger? except for stronder rod bolts in a F model.

Just make sure bike passes tech anywhere, very few rules in bracket racing.

I think he meant the bottom end of the transmission.

Here in IL you can bracket race with a helmet and full leathers. That's it.

Well..... gotta tape off all your lights and stuff, but it's easy to pass tech.

Yeah, I plan on a helmet and full leather. Down the road, when I get the other motor together, the bike might run low 10's. I just like dickin' around with stuff. I can't afford, well I don't want to try and afford to race cars anymore. So, I figure bikes are the next best thing. I'm willing to bet that going 140 in the quarter is a whole hell of a lot scarier on a bike than in a car.

I also always wondered why I see so many guys with red lights attached to there wheelie bars.

Sam Green Racing · « **Reply #39 on:** March 04, 2009, 05:17:57 PM »

Perhaps they are experts at pulling red lights

Good luck with your project.

Sam.

HavocTurbo · « **Reply #40 on:** March 05, 2009, 11:13:51 AM »

Nah 140 isn't that bad.

Wait till you are going close to 200 and then have to slow down..... Makes my heart beat fast just thinkin about it.

pddpimp · « **Reply #41 on:** March 05, 2009, 03:26:00 PM »

200 in a car maybe, but 200 on a bike...I'll pass.

Sam Green Racing · « **Reply #42 on:** March 05, 2009, 03:49:46 PM »

is it pimp or whimp

only joking

Sam.

pddpimp · « **Reply #43 on:** March 05, 2009, 03:56:27 PM »

HA!!

No, I hear ya. It would be sweet, but my balls have shrunk with age. In a way that's like jumping into an ice cold lake.

You know, there is only ONE Ghost Rider in this world. 170mph wheelies on a 500hp Busa is craaaazy.

Sam Green Racing · « **Reply #44 on:** March 05, 2009, 04:28:52 PM »

Quote from: pddpimp on March 05, 2009, 03:56:27 PM

HA!!

No, I hear ya. It would be sweet, but my balls have shrunk with age. In a way that's like jumping into an ice cold lake.

You know, there is only ONE Ghost Rider in this world. 170mph wheelies on a 500hp Busa is craaaazy.

I'll tell you something Pete, I've never done 200mph but on my 134cc Honda, at 120 just a couple of feet above the ground, it sure dose feel like 200

and what's more I'm twice your age

Sam.

HavocTurbo · « **Reply #45 on:** March 05, 2009, 06:28:11 PM »

lol Sam you never cease to put a smile on my face!!!

pddpimp · « **Reply #46 on:** March 05, 2009, 07:35:06 PM »

Quote from: Samcr750 on March 05, 2009, 04:28:52 PM

Quote from: pddpimp on March 05, 2009, 03:56:27 PM
HA!!

No, I hear ya. It would be sweet, but my balls have shrunk with age. In a way that's like jumping into an ice cold lake.

You know, there is only ONE Ghost Rider in this world. 170mph wheelies on a 500hp Busa is craaaazy.

I'll tell you something Pete, I've never done 200mph but on my 134cc Honda, at 120 just a couple of feet above the ground, it sure dose feel like 200 and what's more I'm twice your age

Sam.

Yeah, I hear ya ol' timer.

I must say though, you look pretty good in all white leather. HA!

NitroHunter · « **Reply #47 on:** March 06, 2009, 08:21:10 AM »

As far as lights on the wheelie bars, many tracks require a light for night runs. It's so you can be seen at the end of the track to be sure you're off before sending the next pair.
I've seen a maglight flashlight tiewrapped / duct taped in place that passed tech for a one time use. Of course I installed a real tail light before the next time I went back out to the track...

HavocTurbo · « **Reply #48 on:** March 06, 2009, 08:35:06 AM »

Quote from: NitroHunter on March 06, 2009, 08:21:10 AM

As far as lights on the wheelie bars, many tracks require a light for night runs. It's so you can be seen at the end of the track to be sure you're off before sending the next pair.
I've seen a maglight flashlight tiewrapped / duct taped in place that passed tech for a one time use. Of course I installed a real tail light before the next time I went back out to the track...

You sly dog....

pddpimp · « **Reply #49 on:** March 06, 2009, 08:40:31 AM »

Ah...Makes sense to me.

News:

Author Topic: Drag bike build questions... (Read 10140 times)