750cc pushrod bike build

Started by Rchop, February 15, 2009, 04:14:09 PM

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Rchop

#45
March 12, 2009, 02:32:01 PM
Quote from: Glen on March 12, 2009, 02:25:28 PM
Hope you have plans to protect it from punctures.

It's made from 16ga steel with a 10ga front panel and I will make some kind of shield between it and the front tire.
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

Stainless1

#46
March 12, 2009, 02:48:28 PM
Randy, if something is picked up off the track by your front tire that will penetrate either the .060 or the .134, you are in a lot more trouble than a little gas leak... the front tire will likely be flat....  :-o  If anything I would add a piece of .134 to the bottom for about 6 inches back from the front.
Stainless
Red Hat 228.039, 2001, 65ci, Bockscar Lakester #1000 with a little N2O

Rchop

#47
March 12, 2009, 03:02:25 PM
Quote from: Stainless1 on March 12, 2009, 02:48:28 PM
Randy, if something is picked up off the track by your front tire that will penetrate either the .060 or the .134, you are in a lot more trouble than a little gas leak... the front tire will likely be flat....  :-o  If anything I would add a piece of .134 to the bottom for about 6 inches back from the front.

That has been the plan all along Bob. I want to put some kind of shield in the front including the front of the bottom.
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

Stan Back

#48
March 12, 2009, 03:42:48 PM
Not a biker -- but a little skid plate weight down there surely wouldn't hurt.
Past (Only) Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club"

Rchop

#49
March 12, 2009, 04:24:32 PM
I haven't quite finalized the "skid plate" design yet. Usually when I approach something like that, I spend a lot of time just looking at it while I come up with different ideas in my head. Usually one comes up that is better than all the rest and then I start fabricating.
It's been called the "TLAR" engineering principle.

TLAR= That looks about right
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

Rchop

#50
March 13, 2009, 03:39:21 PM Last Edit: March 13, 2009, 04:41:55 PM by Rchop
I have a question about the "tank protector" I want to install. I have 2 ideas...one is like a simple skid plate that has been recommended and the other is curved horizontally in front of the tank with a bottom plate also. Both are designed to deflect anytyhing picked up by the front tire. The question is: will either of these designs disqualify me from running in the "unfaired" class, such as A/PBG?

Here are pics of each mocked up with cardboard...



Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

1212FBGS

#51
March 13, 2009, 05:16:14 PM
randy
not as you have it mocked up as you have it now.... if you round the front or change the front into an aero pleasing shape it probably wont fly..... Tatro made a curved oil bag in front of his motor on the single and tech had him install a flat panel in front of it...
Kent

Rchop

#52
March 13, 2009, 06:57:02 PM
Ok, thanks for the response Kent. So, a plate made like the top pic should be good then?
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

1212FBGS

#53
March 13, 2009, 10:13:40 PM
 :-D

Rchop

#54
March 15, 2009, 02:46:29 PM
The tank has been welded, leak checked and painted with some "bedliner" material. The mounting tabs will be drilled when the frame tabs are installed. I will make a protective plate out of the .180 aluminum plate behind it...


http://www.frsengineering.com/pp65.jpg
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

Rchop

#55
March 15, 2009, 03:03:34 PM
The steering damper came in Friday. Unfortunately it came with a 47mm fork tube clamp and I have 43mm fork tubes. Not a real problem since I found this new one for only $152. I just have to find a 43mm clamp now...


http://www.frsengineering.com/pp65.jpg
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc

saltwheels262

#56
March 16, 2009, 07:02:33 AM
Quote from: Rchop on March 15, 2009, 02:46:29 PM
The tank has been welded, leak checked and painted with some "bedliner" material. The mounting tabs will be drilled when the frame tabs are installed. I will make a protective plate out of the .180 aluminum plate behind it...


http://www.frsengineering.com/pp65.jpg

will you be able to turn off petcock from riding position?

pingel makes a nice remote controlled one. about $200.

franey
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007

Stainless1

#57
March 16, 2009, 07:21:18 AM
Franey, I'm guessing electric since flowing gas uphill defies gravity... no petcock shutoff from seated required...
Stainless
Red Hat 228.039, 2001, 65ci, Bockscar Lakester #1000 with a little N2O

saltwheels262

#58
March 16, 2009, 07:28:43 AM
 electric might have been mentioned in an earlier post.

going off the pic, got me thinking petcock needed to be shut off also.

franey
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007

Rchop

#59
March 16, 2009, 09:51:33 AM
In the interest of safety, I the installed the petcock where I could easily reach it by my left foot inside the frame rail. I will probably extend the bottom plate a little past the rear end of the tank to protect the petcock also. The fuel pump will be mounted beside the left side of the tank below the frame rail. I will probably have to weld a steel tube to the bottom of the frame rail to cover the fuel pump also. The problem with mounting the fuel stuff low is the extra protection, but I've found simple solutions to those issues.
Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
www.frsengineering.com
#4836 A-PBF 750cc(complete)
#765 A/G 650cc
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