RB head on L-Gata

Mark N

Mark N

Club Member
atomman said:
I don't think so really, if everything is dead flat and true it would seal, the 2 rear head bolts go through it as well, Those 2 rear most chambers are for oil return to the sump, so no oil pressure in there, he has blocked them with the plate and then used the 2 pipes to return the oil externally ,

I have seen oil return kits for RB's that go in the middle rear of the head to help when high rate pumps are used,
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I think you may also have to add water into the equation here.
RB head oil kits usually install on the upper rear core plug.
On the photos, it looks like something similar has been fitted to the lower rear plug, which I'm guessing is water.
If that is the case, he has also machined through the water jacket, which would very difficult to seal by welding.
 
Turn & Burn

Turn & Burn

Club Member
franky said:
when you look at the way hes done that, it looks 'simple'!?
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I think the art of a great engineer is the ability to make the complex look simple. Hours,months, test builds and fails go into making ‘simple’.

I’d be tempted to seal between the plate and head with something, perhaps a wills ring setup, there’s not much clamping pressure on a flat surface.
 
Alphabettispaghetti

Alphabettispaghetti

Club Member
Turn & Burn said:
I think the art of a great engineer is the ability to make the complex look simple. Hours,months, test builds and fails go into making ‘simple’.

I’d be tempted to seal between the plate and head with something, perhaps a wills ring setup, there’s not much clamping pressure on a flat surface.
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that’s exactly what I mean. All the best setups look simple!
 
atomman

atomman

Club Member
Did some measurements this morning ,

Gonna sit down and knock the timing stuff up in CAD this arvo to see if it all works out
 
atomman

atomman

Club Member
here's what I have worked out so far ,

RBL.JPG

The engine image is there just to give me a idea of where it all sits , Sprockets are all modeled to correct sizes and tooth number , so the cam crankshaft ratio is correct ,
Hopefully I can use the L-gata chain tensioner and just modify the guides for the bottom chain , with this design it all stays within the standard from cover , and steps out to the RB cams above so I can then build a bespoke cover that incorporates guides/tensioner or pick up some of the holes used on the RB head for that, I would usually 3D scan all this in and work from there but working from home has its downfalls ,
I have got access to a lathe so maybe next week I can turn some bits up once I have had a look at bearing sizes etc and worked out what will fit, but I do need to mill the head a bit and TiG in the mount but will see how far I can get ,

Good thing with SolidWorks I can get chain lengths off it, So I can have a look and see if there is some thing available all ready out there that works,

 
atomman

atomman

Club Member
yeah looks like when he machined out the head he went into the cam chambers , suppose it sorts out the oil feed for the top pulley,

IMGP5826_20150410112704bce.jpg

Now I have some decent measurements I can have a play around with gear drive to , maybe run the cams as well instead of going to chain for the top,
 
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jonbills

jonbills

Membership Secretary
Site Administrator
those two large sprockets at the top might be a challenge to the engine /bonnet clearance. Big sprocket at the top of the block and 3 small sprockets driving the cam's would be better for clearance wouldn't it?
 
atomman

atomman

Club Member
jonbills said:
those two large sprockets at the top might be a challenge to the engine /bonnet clearance. Big sprocket at the top of the block and 3 small sprockets driving the cam's would be better for clearance wouldn't it?
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They did miss when I did a rough measure, there the same size as RB items , but i get what you mean , its all pretty tight to be fair
 
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