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Oct 03, 2015 8:38 am
Oct 03, 2015 8:38 am
Subject: Re: Gearbox
Hi Chris,
I won't get into the rights and wrongs here as I can see it clearly from both sides and both sides have their merits.
To fit the Alvis box you need to make up a frame to hold it / adapt it to the original mounts.
Position the gearbox in roughly the correct place on wooden blocks etc, (the more accurate at this point the better) then using something like 50mm square tube 2.5mm wall, run a length down each side and a length across the back to pick up on the Alvis mounts, weld together and then figure out the simple brackets from this frame to the original gearbox mounts.
The rest is simply making a new adaptor for the front and rear flanges to mate to the fabric coupling and prop shaft respectively.
It's a pretty simple job but the more care you take in alignment the better the gear shifts and lack of transmission vibrations.
A note here.
At this stage it is well worth converting to a modern clutch as well.
If you buy one that comes with a new flywheel also, it reduces the rotating weight to such a level that the engine feels and responds like you have given it a new lease of life! Gear changes are transformed and even the Alvis box will thank you for this.
I think the club do a kit and I know Bishop Grey do one that works well.
Good luck,
Julian
PS.
My phone number is 0032 3353 3331, 8.30am to 7.30pm Monday through Saturday
Please phone any time if you need help or advice.
This goes for anyone on any mechanical subject.
Hi Chris,
I won't get into the rights and wrongs here as I can see it clearly from both sides and both sides have their merits.
To fit the Alvis box you need to make up a frame to hold it / adapt it to the original mounts.
Position the gearbox in roughly the correct place on wooden blocks etc, (the more accurate at this point the better) then using something like 50mm square tube 2.5mm wall, run a length down each side and a length across the back to pick up on the Alvis mounts, weld together and then figure out the simple brackets from this frame to the original gearbox mounts.
The rest is simply making a new adaptor for the front and rear flanges to mate to the fabric coupling and prop shaft respectively.
It's a pretty simple job but the more care you take in alignment the better the gear shifts and lack of transmission vibrations.
A note here.
At this stage it is well worth converting to a modern clutch as well.
If you buy one that comes with a new flywheel also, it reduces the rotating weight to such a level that the engine feels and responds like you have given it a new lease of life! Gear changes are transformed and even the Alvis box will thank you for this.
I think the club do a kit and I know Bishop Grey do one that works well.
Good luck,
Julian
PS.
My phone number is 0032 3353 3331, 8.30am to 7.30pm Monday through Saturday
Please phone any time if you need help or advice.
This goes for anyone on any mechanical subject.