Oz Laverda engines

shots taken at 03:30 hrs this morning
had a few issues today, like the pistons hitting Clem's copper gaskets
design fault there Clem, gaskets not suited to 82.0mm pistons, bit sad I thought
so machined them out to clear

then the pistons decided to hit the skull caps as well, may have taken a bit too much off the deck height I think
machined a recess in the skull caps, had to relieve them by roughly 2.0mm

then we couldn't get the cam chain to join, my offset cam bearing blocks where too offset at 0.4mm, machined 0.2mm off and chain joins perfect, no adjustment needed
and a stack of small items

have today to get the black engine finished and in the frame
once in the frame Crispin can finish off the bike so I can start on the silver engine and get it back together

stopped being fun at around 21:17 hrs last night

Phil, good tip on the notches, will do that as still have the cases apart on the original race engine, thanks

Maurice, crankshaft and conrods were coated with a non-wettable coating, means oil will not cling to the spinning crankshaft and thus drag is reduced, giving us another 32.7 hp  :o


 

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Absolutely first class!

Just watch out the motor doesn't slip out of your fingers when you install it in the frame...  :o
 
update
shot of the engine being timed
then all together, was around 4pm this last shot
plainly see the ceramic coatings in the exhaust ports in this shot

Orange is life but black is beautiful


 

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3 naked shots

Jotaman got a good behaviour pass from his missus for the afternoon so dropped over to lend a hand
excellent timing, arrived just as we finished the engine in time to help to slot it in the frame
then he gave Crispin a hand to finish the bike off while I started on the original race engine rebuild
crank is back together with 3 new Carrillo conrods, engine should be done in 2 days

big moment arrived, spun her over to build oil pressure
then, fired straight up

fanfuckingtastic,  :D

sounds awesome, very smooth running engine, no vibration issues at all on the bench, very crisp, spins up better then any Laverda I have built
no oil leaks, no bad noises, am happy so far



 

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all dressed up and ready to go play
be at the track at 09:00 hrs tomorrow, Friday
see if we can blow this sucker up

set the rev limiter at 8,200 rpm which we will use to run the engine in  :o
before we stand on it fully

(I know, I forgot to take the timing cover in to get coated black, is there now being done, cover installed is off the Silver Bullet )


 

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Great job Red and crew. I am going moist just looking at the pics, cant wait to hear how it performs on the track.

Scrumpy
 
redax5 said:
all dressed up and ready to go play
be at the track at 09:00 hrs tomorrow, Friday
see if we can blow this sucker up

set the rev limiter at 8,200 rpm which we will use to run the engine in  :o
before we stand on it fully

(I know, I forgot to take the timing cover in to get coated black, is there now being done, cover installed is off the Silver Bullet )
Click to expand...
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There's a menacing look about that bike ! >:(

Good work !
 
Very purposeful looking bike Red, if it goes as well as it looks you'll have a winner. Look forward to hearing the feedback from the riders.
I fell I should point out to European forum members that when Red says he's working at 4am it is in fact 12 noon, so he's not really working late into night, in fact he's knocking off early for lunch.
 
82mm pistons will hit the copper gasket as you say Red, but they wont on "normal" sizes or rebore sizes.There is plenty of meat and the distance between the 9mm studs is 88.5 so you still have 6.5 to clamp with (or 3.25 either side of the bore)

more than adequate as long as you dont rev over 22,000 and keep the comp ratio below 6.5:1.

I cant remember the name but someone in Holland (a sailor I think) is useing 83mm bore, I wonder what he uses for cylinder liners? metal salvaged from Rosswell 1947?

good luck to all, we wait the results in this little corner of UK
 
Well done red - it's looking a really aggresive machine now with that black lump . Don't know what you do on race motors that must perform to max right away, but I give them half a thou extra clearance on bores and a really well hatched hone - then cane the nuts off them!!
Regards - Phil
 
Hi Phil,
We gave the bores an extra 0.0005" clearance on this engine, is set at 0.003" instead of the 0.0025" we use on the street engines.
Not necessary to well hatch these days, we finished the bores with a plateau hone so no need to run the motor in.
Sunnen plateau hone does what the piston rings try and do for the initial start up, knocks all the high spots off the hone finish.

Also gave the Carrillo conrod big ends an extra 0.00025" clearance.

All the rest now is up to Buddha and of course Blair.

Clem, you could go to 83.0mm by using custom liners which I have in stock by the way.
The protruding part at the bottom you would run at 1.5mm wall thickness by machining down the outside diameter which would allow you to use a 1200 size counterbore in the top case.
Can get any piston you want made these days but I have 83.0mm x 13:1 pistons in stock.
Might be a bit large for normal street engine.
We intend to use these pistons towards the end of the year but first I have to modify a set of cases to a through rod design on the engine studs so we can increase the clamping force to contain the compression.
The bore size is not a big issue, the weak engine stud design is by far the biggest hurdle.

Tchau
Red
 
Up the compresion a bit and you could run it on diesel.
                                                        Dave.
 
Fantastic job Red........ :o  Good luck on Friday (and the races)  ;)

Pete
 
mauricejota7604 said:
Hi Red do you really gain that much horsepower with the coating on the crank, is that readily available and who does it?
M.
Click to expand...

Maurice , I suspect Red's being conservative with his horsepower increase claims, I suspect that with the ceramic coating in the exhaust he's looking at more like 35.777 recurring. Factor in the high compression front mudguard and the nitrogen filled tyres and who knows where it'll end up... :D
 
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