I'm going to mirror this thread as I'm finding myself spending more time on VZI these days....
Though I would share my new engine build currently in progress.
Sadly the current engine has been having some issues of late with a noisy valve train.
I changed the hydro lifters with no improvement and having measured lift across the valves it appears one lobe is going flat
Fortunately I have been planning another build as a spare.
I already had a 2.1 MV short block purchased for £75.
It was sold as seized and this turned out to be pistons stuck in the bores.
After a strip down and clean up I checked over all the parts.
The cam was worn on the lobes so that was binned.
All the pistons cleaned up nice but will also be binned as they are the low compression MV type.
The crank looked fine but just needed a polish.
All the parts where dropped off with Jim @ the engine shop for a good check over and crank polish.
He also has a second hand set of DJ High compression pistons kicking around.
2 of the original liners where toast where they had seized so only the other two where honed.
Jim now sells uk made replacement camshafts ranging from stock to several performance versions.
The existing cam i'm running was sourced in the USA and is a CB Performance unit.
It's spec was:
Duration 270 degrees
Lift @ cam .298
I decided on Jim's fast road cam with the following spec:
Duration 290 degrees
Lift @ cam .289
Looks like a nice cam and I will confirm this later.
Anyone who builds these engines will tell you how the cost's escalate compared to a type 1 engine.
Head gasket kit £120
A set of piston rings £55 (twice the price of a T1)
Main bearings and big ends come in at £65.
That said Jim only sells the top quality parts.
A quick comparison between the MV and DJ pistons.
You can see where all the extra compression is made in the dishes.