Off season shed therapy
Moderator: DLRA
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Off season shed therapy
I've had a festering thought in my noggin for 5 years , or so, to build a V8 500cc engine, but , as usual, dreams get hindered by ability, funds, & need.
So far the problems uncounted were.
#1 - machining a billet crank, & crankcase is way out of my retirement funds
#2 - even if I had the funds, putting side by side conrods in would change the cylinder spacing, rendering the heads useless
Here is a compromise, chop the gearboxes off two Honda MC19 250cc four engines, yeah, it won't be a "true" V8 , more of a deviate
The two engines are coupled by spur gears, borrowed from a couple of Honda XL125 clutch basket drive gears, complete with their dampener system
There are no immediate plans to run it at lake G, but,,,,,
So far the problems uncounted were.
#1 - machining a billet crank, & crankcase is way out of my retirement funds
#2 - even if I had the funds, putting side by side conrods in would change the cylinder spacing, rendering the heads useless
Here is a compromise, chop the gearboxes off two Honda MC19 250cc four engines, yeah, it won't be a "true" V8 , more of a deviate
The two engines are coupled by spur gears, borrowed from a couple of Honda XL125 clutch basket drive gears, complete with their dampener system
There are no immediate plans to run it at lake G, but,,,,,
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Chop chop
Oil pump extension drive shaft (out of the pump's ass)
!st tacks
Cam drive gear axle (using 3rd gear - mainshaft- to replace the OEM clutch gear in the cam drive system
Jigged & ready for Tig'n
Welded cases are back from the magician
https://youtu.be/GHmO54CqfqA
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
Re: Off season shed therapy
Looks great. What could possibly go wrong?
It would make a great coffe table talking piece if it doesn't work out!
Big Gaz
It would make a great coffe table talking piece if it doesn't work out!
Big Gaz
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Thanks Gary, nothing has stopped progress, yet,
It might be best as a margarita maker, who knows ?
https://youtu.be/zsVBhYAHvn0
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
- AuotonomousRX
- Posts: 729
- Joined: Wed Jan 06, 2010 10:05 pm
- Location: Eyre Peninsula SA
Re: Off season shed therapy
Hey Tiny
Proper Job
You gotta run a straight out 8 pipe exhaust
Pete
Proper Job
You gotta run a straight out 8 pipe exhaust
Pete
Still trying to decide if I am a procrastinator
Pete
DLRA #866
Pete
DLRA #866
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Progress feels wonderful, after a few months of forwards backwards land (for the non "offyafacebook" people)
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
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- Posts: 44
- Joined: Mon Feb 27, 2006 2:52 pm
- Location: roxby downs
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
-
- Posts: 16
- Joined: Mon Dec 02, 2019 5:09 pm
- Location: Geelong
Re: Off season shed therapy
Those straight cut spur gears between the two crankshafts will sound evil. Cant wait to hear this thing run. Firing order 1-8-3-6-7-2-5-4?
Charliebrown
DLRA #1760
Don’t hope for the best, go and get it.
DLRA #1760
Don’t hope for the best, go and get it.
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Those spur gears are a bit of a worry Charliebrown, considering the revs they will reach,,,
Firing order will be 1 + 60 degrees, then 5 - 2 - 6 - 4 - 8 - 3 - 7, the separation between the two cranks can be varied by rotating them before meshing the gears.
Primary gearing reduction will be a challenge, but I'm sure either clutch choices won't hold together at redline without at least a 50 percent reduction in revs, then there's the overall driveline length to consider
I'll be happy to just hear it idle 1st, when the time arrives,,,
Firing order will be 1 + 60 degrees, then 5 - 2 - 6 - 4 - 8 - 3 - 7, the separation between the two cranks can be varied by rotating them before meshing the gears.
Primary gearing reduction will be a challenge, but I'm sure either clutch choices won't hold together at redline without at least a 50 percent reduction in revs, then there's the overall driveline length to consider
I'll be happy to just hear it idle 1st, when the time arrives,,,
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
Re: Off season shed therapy
looks like its going to be a nightmare to shoehorn that motor, etc into that frame
is there any reason why you don't assemble the complete engine package (clutch, gearbox and carbs etc) then wrap a custom frame around it
is there any reason why you don't assemble the complete engine package (clutch, gearbox and carbs etc) then wrap a custom frame around it
First Australian to ride a motorcycle over 200mph at Bonneville,,,
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
The frame "had" removable lower frame rails Stayt'ie (it is a 1980 Guzzi V50 unit) , the "big block" Guzzies do not, their block is a stressed member of the frame, I plan on doing the same.
The rear frame section that mounts to the gearbox was cut off to allow me to slide the top section forward to accommodate the longer engine, these will be replaced once the motor / transmission unit is one.
I have been down the new frame construction route a few times, but with this Covid lockdown, my access to a good flat workbench , accurate lathe & someone who's welds you could trust your life on (not mine)
The rear frame section that mounts to the gearbox was cut off to allow me to slide the top section forward to accommodate the longer engine, these will be replaced once the motor / transmission unit is one.
I have been down the new frame construction route a few times, but with this Covid lockdown, my access to a good flat workbench , accurate lathe & someone who's welds you could trust your life on (not mine)
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Future road use is a big consideration with the frame, Compromise is what you do, not always what you would like to do.
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Off season shed therapy
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering