Off season shed therapy

See cars and bikes being built for the salt

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gennyshovel
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Off season shed therapy

Post by gennyshovel »

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
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There are no immediate plans to run it at lake G, but,,,,, :wink:
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

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Chop chop
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Oil pump extension drive shaft (out of the pump's ass)
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!st tacks
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Cam drive gear axle (using 3rd gear - mainshaft- to replace the OEM clutch gear in the cam drive system

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Jigged & ready for Tig'n
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Welded cases are back from the magician
https://youtu.be/GHmO54CqfqA
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
BIG GAZ
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Re: Off season shed therapy

Post by BIG GAZ »

Looks great. What could possibly go wrong?
It would make a great coffe table talking piece if it doesn't work out!
Big Gaz
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

BIG GAZ wrote: Wed May 19, 2021 6:46 pm Looks great. What could possibly go wrong?
It would make a great coffe table talking piece if it doesn't work out!
Big Gaz
Thanks Gary, nothing has stopped progress, yet,
It might be best as a margarita maker, who knows ?
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https://youtu.be/zsVBhYAHvn0
Tiny DLRA# 484
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AuotonomousRX
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Re: Off season shed therapy

Post by AuotonomousRX »

Hey Tiny

Proper Job

You gotta run a straight out 8 pipe exhaust 8)

Pete
Still trying to decide if I am a procrastinator

Pete :?
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

Yeah Pete, 8 pipes, with megs, 118 DB should upset the neighbors

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Tiny DLRA# 484
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

Progress feels wonderful, after a few months of forwards backwards land (for the non "offyafacebook" people)
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Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
mal hewett
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Re: Off season shed therapy

Post by mal hewett »

That is an Amazing job Tiny,camt wait to hear it run. :shock:
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

Thanks Mal
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Tiny DLRA# 484
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Charliebrown
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Re: Off season shed therapy

Post by Charliebrown »

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
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

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 :roll:
I'll be happy to just hear it idle 1st, when the time arrives,,,
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Stayt`ie
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Re: Off season shed therapy

Post by Stayt`ie »

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 :?:
First Australian to ride a motorcycle over 200mph at Bonneville,,,
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

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)
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

Future road use is a big consideration with the frame, Compromise is what you do, not always what you would like to do.
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gennyshovel
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Re: Off season shed therapy

Post by gennyshovel »

Tiny DLRA# 484
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