RB head on L-Gata

[atomman]

Hoping to be allowed back to work this week , fingers crossed,

So I can do the head modifications to fit the middle sprocket set up, machine the intake manifold down and hopefully water jet some DCOE mounting flanges out that ive knocked up in CAD ...........of course in between 'real'work

 

[Wally]

Hoping to be allowed back to work this week , fingers crossed,

So I can do the head modifications to fit the middle sprocket set up, machine the intake manifold down and hopefully water jet some DCOE mounting flanges out that ive knocked up in CAD ...........of course in between 'real'work

How dare "real" work get in the way of a good project [emoji23]

 

[atomman]

got a bit done today on the RB-L



manifold machined flat ready for the DCOE flanges , when I fix the leak on water jet

 

[atomman]

I also managed to machine the head for the middle sprocket set up ,






To do list :-

Drill 4 holes on the same PCD as the RB cam drives into each of the L-gata ones to mount them up on the camshaft ends
Dowel the 2 middle sprockets together
Make the mounting shaft for the little gear on the top chain
Sort a tensioner for the top chain, will probably part of the top cover assembly ,
Machine a bit off the shaft to get the rear middle sprocket back about 4mm to get the chain dead true from the crank,

I may even get away with modifying the bottom chain guides to sit in further , or will make new ones,


If I can get it all timed up and turning over with this set up on the engine stand I can then sort out the oiling for the camshafts and other bits,

 

[Alphabettispaghetti]

Nice work. As always.

the leak on the water-jet. So many bad jokes it’s unreal.

 

[jonbills]

I also managed to machine the head for the middle sprocket set up ,


View attachment 39275
View attachment 39278
View attachment 39277

To do list :-

Drill 4 holes on the same PCD as the RB cam drives into each of the L-gata ones to mount them up on the camshaft ends
Dowel the 2 middle sprockets together
Make the mounting shaft for the little gear on the top chain
Sort a tensioner for the top chain, will probably part of the top cover assembly ,
Machine a bit off the shaft to get the rear middle sprocket back about 4mm to get the chain dead true from the crank,

I may even get away with modifying the bottom chain guides to sit in further , or will make new ones,


If I can get it all timed up and turning over with this set up on the engine stand I can then sort out the oiling for the camshafts and other bits,

not bad for a days break-time work

 

[Mark N]

Nice work and good progress!
Have you thought about how you are going to get the four holes drilled in each cam sprocket and have the correct cam timing once both chains are in tension?
Is that a tiny sprocket on the right side of the middle sprockets?

 

[atomman]

Nice work and good progress!
Have you thought about how you are going to get the four holes drilled in each cam sprocket and have the correct cam timing once both chains are in tension?
Is that a tiny sprocket on the right side of the middle sprockets?

thanks Mark,

Yes and yes

will probably end up using a pair of adjustable cam pulleys in the end though , unless it is spot on , the small sprocket will be to hold he slack side of the top chain,

 

[Mark N]

thanks Mark,

Yes and yes

will probably end up using a pair of adjustable cam pulleys in the end though , unless it is spot on , the small sprocket will be to hold he slack side of the top chain,

Isn't that the tight side?
It's going to be spinning pretty quick at 2.5 times engine rpm.

 

[atomman]

Isn't that the tight side?
It's going to be spinning pretty quick at 2.5 times engine rpm.

yep sorry, tight side, The slack side is the same as the tensioner , its just there instead of a guide for now, can you see any problems with using a gear instead of a guide ? its gonna have needle roller bearings in it , like the middle sprockets

 

[peter_s]

Incredible!

 

[Albrecht]

To do list :-

Sort a tensioner for the top chain, will probably part of the top cover assembly

Doesn't give you too much space to work with. I wonder if a manually-adjusted jockey-wheel (like the one on the S20) would suit that task?

 

[atomman]

Doesn't give you too much space to work with. I wonder if a manually-adjusted jockey-wheel (like the one on the S20) would suit that task?

I was thinking of using the small sprocket for that job originally ,

looking back on those S20 pictures , I may be able to pick up some mounting point on the Rb head and come up with something similar

 

[Alphabettispaghetti]

Doesn't give you too much space to work with. I wonder if a manually-adjusted jockey-wheel (like the one on the S20) would suit that task?

I was thinking the same, something like the Kameari setup?(I now get the s20 history!).

 

[atomman]

Fixed the water jet this morning

 

[jonbills]

Fixed the water jet this morning

View attachment 39449 View attachment 39450

Are they DCOE flanges to weld onto the RB runners?

 

[uk66fastback]

Great stuff although I can’t pretend to understand the detail of most of what is being discussed and attempted. Talk of a water jet machine got me all intrigued though so I spent 30mins watching a YT video on one ... fascinating stuff, especially at 94,000lb of pressure! I was aware what they did roughly but the resources for learning more about things like this from the comfort of your chair are infinite. What lucky people we are, on the whole!

 

[atomman]

Are they DCOE flanges to weld onto the RB runners?

Yeah they were but there's a mistake if you can spot it.......

 

[atomman]

We got rid of our plasma cutter for the water jet as is so much more versatile and can cut anything, it's a great bit of kit

 

[jonbills]

Yeah they were but there's a mistake if you can spot it.......

Not a clue, but it took me half the thread to understand what you were doing with the crank sprocket on a bearing