Legendary

"GhostZ" (GhostZ) 09/03/2013 at 02:26 • Filed to: OS Giken, L28 head

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An RB before the RB. 11,000 rpm if your engine could take it. 1973. Just wanted to post this pic I found.

D > GhostZ 09/03/2013 at 02:29

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I talked to a guy. He had an SR in a S13. He swapped if for an RB.

GhostZ > D 09/03/2013 at 02:34

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Sweet. RB25 or RB26?

It's always been a bit for fantasy to, instead of swapping an L engine for an RB, do a DOHC conversion (above). The RB and L are so similar (in terms of configuration, not tolerances) that a DOHC head with twin turbos is actually about as (if not a little more) powerful than a 20-year-newer RB26DETT. And even without turbos, can match the stock rated HP with n/a power if you bore/stroke the block. The RB can take more abuse though.

D > GhostZ 09/03/2013 at 02:41

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I don't think he mentioned. But he got an R33 after than and now finally an N/A Z32 in Midnight Purple. He's a Nissan guy...

GhostZ > D 09/03/2013 at 02:50

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Anyone who takes the time to look, specifically, for Mid Night Purple is good in my book.

I love Nissans, but pickings are hugely deprived here. If our car market was like Japan's, I'd have bought myself an R32 already. Sadly, in the midwest USA, Nissan is associated with crapbox FWD sedans, or rusted old Datsuns. I love the RB motor, and pretty much anything about it, but they're absurdly expensive to get over here, swapped in, registered, and running. For the price of a running RB26 in the USA, you have to pay about the same amount as a 650HP RB26 in Australia, or Japan. That's why so many Z's get bastardized into Chevy Small Block swaps.

SR20s aren't as bad, since they're a lot more common (we got a few cars with SR motors) and they just bolt right into the US spec 240SX. But I could never go down in cylinders with an engine bay as massive as the 240z's.

Bird > GhostZ 09/03/2013 at 13:17

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One day...I'll have a hakosuka with one of those...

In case you haven't seen it:

http://www.speedhunters.com/2013/02/engine…

D > GhostZ 09/03/2013 at 14:38

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I kind of want a B13 Sentra SE-R, for dat SR20de. Would be a great daily driver.

GhostZ > Bird 09/03/2013 at 20:03

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Oh, I've seen it.

The problem is that there are so few of these kits around that they run you about $45,000 - $60,000 to get ahold of.

The result? About 230-240HP on a stock motor, or a 50% increase. Not bad considering it's a 2.4l engine spinning to 9k rpm, but not terribly impressive for the money. One with a built bottom end, lightweight pistons and crank, can get up to the 11k rpm and touch 350HP. The motor that you showed has the compression increased and running race fuel, giving it that last bump to 420HP.

But the real benefit comes with boost and bore. Its no surprise now that a Twin-Turbo L28, bored and stroked to an L30, with these heads could spin to 9k and produce about 1.2bar boost, resulting in a early 70s engine that could make 600HP with 3 liters.

It basically corrects the three critical flaws in the L engine: sidedraft heads, single cam and small valves. By cramming 2 more vales in and making the heads crossflow, DOHC, and 4v, you bring it up to race-spec quite easily.

Bird > GhostZ 09/03/2013 at 20:11

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Yeah...my desire to want one has very little to do with the performance.

I feel like there are some things you can look at, and in a way you can just 'see' the precise engineering.

It's like looking at the movement of a fine watch.

GhostZ > Bird 09/03/2013 at 20:13

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Exactly. I look at it more as a historical piece, showing how far they could push it even back then. It wouldn't surprise me if OS Giken started re-manufacturing updated ones for newer Z cars, now that the Z car has passed from "cheap sports car to mod" to "classic car to keep original" status here in the US.

Bird > GhostZ 09/03/2013 at 20:21

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Oh, they're already are re-releasing them. They're custom order, and according to Speedhunters, nine have been made.

The photos I posted are of the 'new' design. They aren't recasting the head exactly, but upgrading it. Cam caps are different, and the gear drive is an option.

They're calling it the TC24-B1Z.