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What did you do to your Z this week?
- Thread starter jonbills
- Start date
Very nice, are they for a subaru r180?? If so where did you get them from.
Robbie J
Club Member
Robbie J
Club Member
just a plate one, no idea if it had a DCCD attached to it
You could make bigger cutouts in the pistons safely enough I think, to bring the CR down a bit?
Alphabettispaghetti
Club Member
With your bumpy cam shouldn't the compression bleed on the dynamic and cam make it ok?
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Mikee
Club Member
I got mine a few weeks back and fitting them and the diff next week so I’ll let you know how they shape up.
Seem like a really nice bit of kit if you ask me and your right he’s a nice guy.
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Alphabettispaghetti
Club Member
Yeah, supportive comments from my sensei in Langley Millsuggests things should be fine at 12.5 given the spec of everything at play. It’s not like I’d run it on anything less than 98ron anyway!
perceived wisdom says it should be. However we all know how that can work out.
I don't have the welded and shaped head you have, not quite the compression either, also had a worry about fixed advance with the Kameari setup. However Mr Mori says it'll be 'very fine'.
My greatest worry is that we run out of dead dinosaurs by the time I need to run it.
There'll be more on other planets. You just need to wait for the warp drive to be invented.
Robbie J
Club Member
yes very interested in how it goes as I have a while before it goes together, how much HP you putting thro the R180 STI diff?
Mikee
Club Member
I should explain a little first!
Currently set up is Rb25det engine, rb20 gearbox on stock diff.
Not had the chance to run anything other than a base map which is 250-270hp but limited to 4500rpm. Gearbox is whining and not good over 300.
Stage one is new diff and shafts as discussed. No change to engine map.
Stage 2 is Rb25 gearbox and new prop then multiple remaps to give mid to high 300s but make it useable and adjustable turbo.
I know of another Rb25 conversion that had the same diff and 320ish and was told it was driving nice.
I’m not sure what the maximum it can take is. Should be fun finding out!
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Robbie J
Club Member
I would love to meetup, I will drive the 280 as is for a few months before we start stripping. I have RB25 Neo (not sure which turbo or tune yet) 370Z 6 speed, adapter plate, STI diff and CVs. I would be worried by second-hand Skyline parts are often abused (i had an R33GTR and the gearbox was classed as a consumable item). That said I have no idea how good my 370 G/B is
Be interested to know how much they weigh compared to standard axles.
Robbie J
Club Member
in the box, both weigh 15.9KG so .3KG of box
richiep
Club Member
I should make a thread for this stuff really, but in the meantime, here’s the latest on the big bore N42. With the first chamber pretty much done, I’ve duplicated the design and measurements along the head with a mixture of a cutout template and a set of french curves to try and get the most exact replication. My OCD and caution dictates I then mask off the head face to protect against any rogue carbide moments.
The principal tools are a set of 6mm shank carbides for aluminium in a power drill. The drill is actually much more stable and controllable, being a relatively weighty two-handed tool. I also have a set of 3mm Dremel-size carbides for detail work in certain areas. These are more tricky to use and require more care. However, they are sidelined for the moment as my Dremel’s long flexible extension broke earlier.
I will work along the head shaping the “scoops” into the valves opposite the spark plug holes, and then turn the head around and do the sections either side of the holes. Once the carbide work is done, I will switch to sanding rolls and flap wheels to smooth the carbide texture out. This will be followed with hand-sanding with wet and dry paper moving through the grades from 240 to 2500 grit. Then some Autoglym metal polish, either on a Dremel felt bob or by hand.
The chamber I’m working on gets its seats protected with a pair of sacrificial valves, which are actually BMW E46 valves. These have 8mm stems and are 46 and 38mm, i.e. the same as the race size L-series valves.
The chambers will be cc’ed before the sanding stages to get as close to 34cc as possible.
TBH, I’ve got well into this whole headwork thing, and will be doing an assortment of different L-series heads going forward. I’ve got it in mind to build a flow bench so I can really do some fine tuning down the line.
The principal tools are a set of 6mm shank carbides for aluminium in a power drill. The drill is actually much more stable and controllable, being a relatively weighty two-handed tool. I also have a set of 3mm Dremel-size carbides for detail work in certain areas. These are more tricky to use and require more care. However, they are sidelined for the moment as my Dremel’s long flexible extension broke earlier.
I will work along the head shaping the “scoops” into the valves opposite the spark plug holes, and then turn the head around and do the sections either side of the holes. Once the carbide work is done, I will switch to sanding rolls and flap wheels to smooth the carbide texture out. This will be followed with hand-sanding with wet and dry paper moving through the grades from 240 to 2500 grit. Then some Autoglym metal polish, either on a Dremel felt bob or by hand.
The chamber I’m working on gets its seats protected with a pair of sacrificial valves, which are actually BMW E46 valves. These have 8mm stems and are 46 and 38mm, i.e. the same as the race size L-series valves.
The chambers will be cc’ed before the sanding stages to get as close to 34cc as possible.
TBH, I’ve got well into this whole headwork thing, and will be doing an assortment of different L-series heads going forward. I’ve got it in mind to build a flow bench so I can really do some fine tuning down the line.
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Mikee
Club Member
Nice build. I purchased an unfinished project and was told it was an Rb25 gb not the rb20 I have. I just thought it was easiest to go back to stock and match the ratios easier with the manual speedo gear so I could use the stock speedometer. I have a couple of R33 gearboxes so I’ve got a spare that I hope is ok. I’m just getting into shows and this forum. Was at donnington and silverstone the other week and booked into silverstone classics and possibly japfest donnington. Where are you located?
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Mikee
Club Member
Got my new Subaru sti R180 gearbox ready for fitting next week with drive shafts from www.datsunrestomods.com not sure if anyone has these fitted yet. I’m keen to get some view and opinions. Was going to go with either customs from Dave mac in Coventry or the expensive kit from the z store but these seemed a good option.
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