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RB head on L-Gata
- Thread starter atomman
- Start date
Mark N
Club Member
That's an RB26 sandwich plate, it won't fit an RB20.
Mark N
Club Member
It might be easier to chop up the RB20 lower plenum, like you said, then weld on new runners and these:
https://www.ebay.co.uk/itm/Weber-DC...081723?hash=item36565ba97b:g:4fEAAOSwXeJXfrtl
https://www.ebay.co.uk/itm/Weber-DC...081723?hash=item36565ba97b:g:4fEAAOSwXeJXfrtl
atomman
Club Member
ok thanks why wont it fit ? different mounting centres ?
may be easier to chop up the other one then, i could just water cut some of those DCOE flanges and TiG them on
richiep
Club Member
There’s an adapter plate available to allow that RB26 intake to fit the RB20/25 heads:
https://otakugarage.com.au/product/rb26-intake-manifold-adaptor-rb25-rb20/
Mark N
Club Member
Yes, different pattern, I put the link on post 12 for the adapter between the head and sandwich plate.
Alphabettispaghetti
Club Member
Keep it on carbs. you know it'll be cooler.
richiep
Club Member
Robbie J
Club Member
Albrecht
Well-Known Forum User
Atomman, any thoughts on 'clocking'/'unclocking' (even slightly) the L-gata's installation angle to give a little more scope for inlet/exhaust manifold shape/packaging, and - as a spin-off - getting closer to the RB's much more upright installation angle to mitigate any top-end oil pooling/oil draining issues?
LY (crossflow) 'clocked' the L-gata block even more to allow max scope for long inlets and ECGI injection via a dedicated bellhousing and engine mounts. I notice that the recent-ish 'Datsunworks' twin cam head stayed with the stock block installation angle and - to my eye anyway - looks a bit odd as a consequence.
LY (crossflow) 'clocked' the L-gata block even more to allow max scope for long inlets and ECGI injection via a dedicated bellhousing and engine mounts. I notice that the recent-ish 'Datsunworks' twin cam head stayed with the stock block installation angle and - to my eye anyway - looks a bit odd as a consequence.
Mark N
Club Member
There are various head drain kits available for RB engines as this is a common problem with them, especially once uprated oil pumps are installed.
atomman
Club Member
Now that looks awesome Jon !
I'm thinking of either something like that or 3 separate mini manifolds joined with coolant tube above like in the red Z , can't get near a machine for a while though
atomman
Club Member
The thought came across my mind today as it goes , when I was looking at the oil return's on the RB head, and thinking about gravity returns, and remembered I machined an angle on the inlet manifold to keep the float chambers level for the L-gata,
interesting they 'clocked' the engine and gearbox for the LY , when I think about it if you didn't 'unclock' the box the gear stick would be the wrong angle , will have to do some measurements to see how far it needs to go ,
Alphabettispaghetti
Club Member
a linkage arrangement would sort that though?
atomman
Club Member
After my working from home Zoom meetings this morning and a bit of CAD work on Ventilator parts , I got some time to have another look at the RB-L , Now i know what to call it from the video links , thank Rich ,
Front pulley off and lower cover, head does indeed bolt on, just nipped up for now,
376670981970 376670981970
the rear is a bit short and the water ways are showing them selves from the L-gata block ,
The cams stick out further than L-gata one, so I can now see why others have done what they have with timing chains, I want to keep the font cover as standard as I can so there is only room for one Duplex chain to come out the top , if I don't want to mess around with water pump relocation, oil pump etc .
So plan is to take the chain up to another gear and then have another gear inline to step out and inline with the RB cams , this will keep it outside the L-gata front cover and then make a sort of RB top cover but sealed like the links from Japan on this thread, This should allow me to use a factory'ish chain tensioner and then come up with something for the top ,
something like this
excuse the long chains
I had some spare old timing chains, bottom sprocket and cam gears, which fit on the RB cams funnily , which came in handy , could get away with smaller sprokets but need to count teeth and stuff to see ratios for RB and L-gata, Or I could always go full OS-Giken and run gears ...........
Front pulley off and lower cover, head does indeed bolt on, just nipped up for now,
376670981970 376670981970 the rear is a bit short and the water ways are showing them selves from the L-gata block ,
The cams stick out further than L-gata one, so I can now see why others have done what they have with timing chains, I want to keep the font cover as standard as I can so there is only room for one Duplex chain to come out the top , if I don't want to mess around with water pump relocation, oil pump etc .
So plan is to take the chain up to another gear and then have another gear inline to step out and inline with the RB cams , this will keep it outside the L-gata front cover and then make a sort of RB top cover but sealed like the links from Japan on this thread, This should allow me to use a factory'ish chain tensioner and then come up with something for the top ,
something like this
excuse the long chains
I had some spare old timing chains, bottom sprocket and cam gears, which fit on the RB cams funnily , which came in handy , could get away with smaller sprokets but need to count teeth and stuff to see ratios for RB and L-gata, Or I could always go full OS-Giken and run gears ...........
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Turn & Burn
Club Member
They’re both spinning the same way aren’t they?