V8 trike build.

[addjunkie]

Like the top tube lines. But square tube is a bit marmite. Will the engine come out again?

 

[Morrisman]

Like the top tube lines. But square tube is a bit marmite. Will the engine come out again?

I’m kind of 50/50 over the square tube, but there will probably be some panelling over the rear half of the frame eventually. I’ll have a transmission cooler back there, maybe various other necessary mechanical odd and sods too.
The frame will lift off over the top of the motor, it’s just wide enough.

 

[Morrisman]

Eventual plan is a pickup style bed at the rear, with spun ally fuel tank, a nod to my old hot rod.



And I may even go as far as using a similar scoop on the motor.... but i might stop short of the twin carb tunnel ram...

 

[selectedgrub]

Good to see your mojo returning.

 

[Morrisman]

Good to see your mojo returning.

I definitely needed an interesting project to get my brain back on track.

And I still have a continual struggle with the amber nectar, but having something to focus on is a good thing.

 

[Morrisman]

Like the top tube lines. But square tube is a bit marmite. Will the engine come out again?

I did plan on fitting another round tube, instead of the square tubes, a bit like this mock-up. It needs torsional stiffness though, triangulation, to stop the whole thing winding up the rear half when/if I ever unleash 350 horsepower.

 

[Misterg]

There is a slight angle in it as the Jag diff pinion is offset, so the motor is pushed across an inch at the rear, to line up, thus the U/J will always be ‘working‘ a bit.

big donut as a UJ. Not sure why

Gawd! I think I'm trying to teach my granny to suck eggs, but...

A single UJ (Hooke's joint) running at an angle isn't constant velocity: The output speed fluctuates at twice the input speed (worse as the angle gets bigger). It could start rattling a bit if it's coupled directly to the diff with nothing resilient in between. In a double UJ (like a conventional propshaft), if the joints are correctly aligned, the fluctuations cancel each other out and you get constant velocity transmission (provided the angles at each joint are equal - e.g. if the input and output shafts are parallel).

The rubber 'do-nut' joints suffer from pretty much the same thing, but being rubber, they damp out the torsional vibrations better.

Humblest apologies if you know this, but I didn't want to let it pass in case you didn't.

Following with interest!

 

[Morrisman]

Gawd! I think I'm trying to teach my granny to suck eggs, but...

A single UJ (Hooke's joint) running at an angle isn't constant velocity: The output speed fluctuates at twice the input speed (worse as the angle gets bigger). It could start rattling a bit if it's coupled directly to the diff with nothing resilient in between. In a double UJ (like a conventional propshaft), if the joints are correctly aligned, the fluctuations cancel each other out and you get constant velocity transmission (provided the angles at each joint are equal - e.g. if the input and output shafts are parallel).

The rubber 'do-nut' joints suffer from pretty much the same thing, but being rubber, they damp out the torsional vibrations better.

Humblest apologies if you know this, but I didn't want to let it pass in case you didn't.

Following with interest!

Gawd, I think my, possibly, 2° out of line joint is far closer to perfection than your average mass production, axle-strapped-to-leaf-springs, angle-varies-depending-on-how-much-junk-you-have-in-your-trunk, U/J installation.

 

[Misterg]

Gawd, I think my, possibly, 2° out of line joint is far closer to perfection than your average mass production, axle-strapped-to-leaf-springs, angle-varies-depending-on-how-much-junk-you-have-in-your-trunk, U/J installation.

Sorry, no offence intended! - I suspected I might be trying to teach my grany to suck eggs

 

[Morrisman]

Sorry, no offence intended!

No worries. Constructive criticism is always welcome. I generally make so many mistakes when I do anything, it’s good to have people watching my back.

 

[Morrisman]

I decide I really didn’t like the square tube, so knocked it out and tried again. If I do put diagonals in it will be some smaller diameter round tube.

 

[Morrisman]

Had an industrious couple of days in the shed.





Engine plate.


The square bar is temporary.



Couple of gussets to go in the rear end.

 

[Morrisman]

Steering head arrived today, on time, and looks pretty good. They guy had pressed the bearing into one end, and the first thing I noticed was not enough of an edge behind it to tap it out. So, I threw it in my baby lathe and turned a slight taper in each end.





Then I needed a way to align it while I do the prep and cutting to tack it in place, so, a couple of old jack wheels were used, the bore and face was checked and squared, and a taper turned on the outside of each. An 8mm hole tapped in for a locking screw. They are a very close fit on some lengths of 3/4” CDS tube I have.





Have to decide the angle then start cutting and trimming.

 

[Migmac]

Your attacking this full on, impressed

 

[DanZac]

This is going to be a real beast once it's done.

Loving the progress reports, please keep it coming.

 

[W.olly]

Why OH Why did i read this build, i have always wanted to build a trike again, well first didnt get finished. And a V8, just love them If i didnt have my boat project i would be doing one i reckon.

Good luck with and luvin the project already will be watching more cracking work

 

[Morrisman]

Why OH Why did i read this build, i have always wanted to build a trike again, well first didnt get finished. And a V8, just love them If i didnt have my boat project i would be doing one i reckon.

Good luck with and luvin the project already will be watching more cracking work

It’s a bucket list thing with me, been wanting to do it forever. It’ll have to go through MSVA etc, which entails trailering it higher and yon and various paperwork and inspections, so it may never see the road, but you never know.

Jigging up to weld some of the engine mounts earlier. There will be some more on the front of the cylinder heads and the bellhousing. I wish I had a tig welder, and the expertise to use it properly. My mig does the job, but isn’t too pretty.

 

[roofman]

So glad you have got your MoJo back here mate...really enjoying this thread

 

[Morrisman]

So glad you have got your MoJo back here mate...really enjoying this thread

Thanks. New year, new me. I’ve also been going to the gym 3 times a week for nigh on two months now. A bit of routine in ones life is good for the soul.

 

[roofman]

Thanks. New year, new me. I’ve also been going to the gym 3 times a week for nigh on two months now. A bit of routine in ones life is good for the soul.

Good to hear bud...more day light approaching soon,lifts my soul up as i hate the dark winters.