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Want to build a high performance L28. Advice needed


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#1
Diseazd

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I am looking to build a high performance motor for street use to be installed in my 71 240 resto project.

I am on the East Coast and am thinking of possibly building a stroker motor.

What year and type of block/head would be best for this? I want to use the L28 and am considering triple webers, cam, etc. Any insights and advice would be much appreciated as well as some direction on where the best place to get said parts would be.

Thanks in advance,

Guy

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#2
xray

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http://www.geocities...roker/index.htm

And,

www.hybridz.org

You may consider calling Rebello Racing for more info as well.

Basically:
F54 block
P90 (or N42) head
LD28 crank
9mm L24 rods
KA24DE (or equivalent) pistons
Steve

HLS30-81167 restored, top to bottom.
2001 M roadster Gehen sie Schneller!
1987 SpecE30 Trackster...welcome home!
Making up for owning a minivan...
http://picasaweb.google.com/srcartermd

#3
RIP260Z

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What Xray said gives you a basic stroker set up. You can use the the other L28 block as well. But depending on what you want and how much cash you have, you can have a range of stroke and bore combinations/ non OEM rods and pistons to accomodate and some in depth machine work. But what ever you decide, do as much homework on this as you can. There is plenty of info out there.
RS30 June 1978 built 260Z (9th last)

1965 Nissan Silvia (CSP311) the next restoration

#4
Diseazd

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Also considering turbo L28

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#5
e_racer1999

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turbo vs NA depends on your use. NA will (most likely) have more down low oomph, whereas turbo has a higher ceiling for tom-end HP. i'm building a hi-comp NA for now until i invest in a megasquirt turbo motor
Jason King
6/72 240Z / HLS30 89646 (Yellow)
1996 Infiniti I30 *I finally have all Nissans again!*
1971 510 4door (wife's car)
IZCC Member #14186

As unfortunate as it may be, if you want to vintage race, go Euro....If you want to race for real, stick with the Z!


#6
janaka

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whats your budget?

#7
Diseazd

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Maybe $5-10k. I know that's a bit vague. What are the best options for both N/A and FI in those ranges?

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#8
barth4567

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Take a look at Rebello Racings website as well. And if I remember right there was a stroker for sale on this site a while back in the classifieds. It's only moneyLOL

#9
rdefabri

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Diseazd,

Since you are East Coast (looks like VA) - check out Sunbelt Performance in GA. I don't have the contact info, but I recall a few of our members swear by their work.
'72 240Z HLS30-73667 (sold)
'66 Jaguar XKE FHC, numbers matching
'67 Honda CL77 305 Scrambler, 8,000 original miles

#10
janaka

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best option for that price range for HP per dollar will be a V8 swap.
I was quoted $3500 for a N42 ported and new cam to drop onto my F54 block, then would need to add triples to that to get north of 200RWHP.
$4500~ for 200hp. not a good value IMO. For $7-8k I can drop in a carb'd LQ4 6L V8 and 6spd tranny. 400+HP more reliable, more streetable and more torque.

#11
bkelly

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With performance it's- cheap, fast, reliable. Pick two.

I would highly recommend Rebello for an L6. I've emailed them back and forth a couple times on building an engine for me. Pretty much you tell them what you want out of it and they will build it.

If you're looking for all out power and don't care about "purity", then go with the V8. You'd have to build an all out racing L6 for the power you can get out of an stock LS6 engine.

Remember, you should upgrade your rear end when putting down that type of power.

#12
RogerZ

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check in with the hybridz guys they are into all kinds of mods.

#13
rdefabri

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I helped a buddy do the V8 swap into a '77 280Z some 20 years ago. It was phenomenally quick, almost brutal. You'd likely want an R200 to support that power - R200 has the nuts to handle it.

The problem was, IMHO, it lost the essence of being a Z. The sound of an inlline-6 with a less restrictive exhaust is fitting of a small, light sportscar like the 240. Not that I don't like rumbling V8s :)
'72 240Z HLS30-73667 (sold)
'66 Jaguar XKE FHC, numbers matching
'67 Honda CL77 305 Scrambler, 8,000 original miles

#14
Diseazd

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I think I've decided to build an L28 block with 10 to 1 flat top pistons. We're thinking about the P 90 head shaved (shimmed cam towers) with Isky cam (reground Datsun). I'm going to start off with SU's with SM needles. I'll do an aluminum flywheel with the Centerforce clutch. The engine will be painted stock colors and should look like the stock 2400 when finished. This combo should give me some good pop with a chance to upgrade the intake to either Webers or fuel injected throttle bodies when the checking account fills back up! I'm going to put the R 200 (3:53?) rear and hopefully convert to CV's. How's that sound for starters? Appreciate all of your input as usual. Guy

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#15
xray

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If that's "all" you're going to do, the rear end swap will be beneficial more for the ratio than the stoutness. From what I've read and other respected opinons have voiced, the R180 is good to around 250hp, potentially higher without shocking the driveline from high RPM drag launch-style clutch drops.

The other option is to get some pro headwork done on your E-series head. Sunbelt Performance (as mentioned above) can do headwork to give you near 200hp, with the higher rev limit of the 2.4 block. No need to change the rear end unless you want a better ratio...Not sure of the cost analysis there, (figure 2k?) but certainly well within your budget.

ITBs look cool, but I haven't heard much in the way of performance enhancement of stock EFI with aftermarket management (eg megasquirt)...check with the guys at hybridz for more info. Ditto on DIS-type mods.

SM needles...where's Beandip? I have the stock 54s on mine (L28/P79) and it supplies plenty of fuel. Just smell my clothes after a tuning session--yuk!) The consensus of those who have experience with them is that they are too narrow a profile and over-enrichen the mixture. You could always buy some extra 54s and grind the profile to suit....
Steve

HLS30-81167 restored, top to bottom.
2001 M roadster Gehen sie Schneller!
1987 SpecE30 Trackster...welcome home!
Making up for owning a minivan...
http://picasaweb.google.com/srcartermd

#16
Diseazd

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We are going to do some trick stuff to the head. I'm not sure exactly what since I'm leaving that up to "Doc" as in the Z Doctor in Roanoke Virginia. He's sending the head off (not sure where yet but will update) to get some trickery done. Some kind of flat top valves???? Once again I'll let you know when he let's me know. gUY

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#17
rdefabri

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I recall that Bryan Little (Z Car Garage) knew the Z Doc and consulted with him on the building of his Z.

He did a "junkyard" version of what you are suggesting (P90, shaved, L28 block). He estimated about 200HP, and with 13.9 second 1/4 mile times, I'd believe it.

He did it on a crazy budget...his site is still out there - http://www.geocities...001/engine.html
'72 240Z HLS30-73667 (sold)
'66 Jaguar XKE FHC, numbers matching
'67 Honda CL77 305 Scrambler, 8,000 original miles

#18
xray

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Interesting about the SM needles, too. Would've been cool to see a side by side comparison, 54 vs SM.

165rwhp is OK. Guy in my local Z club has a cammed L24 with triples that pulls 162 and revs all the way to 7500. Don't know the torque curve on it, though, but he says it's pretty flat until 3000 rpm. I'm betting Little's combo is more fun on the street (since that's what I've done:nervous:)

BTW, not much "trick" headwork left to be done on streetable L6s. Most is common knowledge...Here's a nice read while waiting on your head to return:
http://www.thezstore...PROD/TB/70-1050

Covers most of the basics and can be read easily in a day.
Steve

HLS30-81167 restored, top to bottom.
2001 M roadster Gehen sie Schneller!
1987 SpecE30 Trackster...welcome home!
Making up for owning a minivan...
http://picasaweb.google.com/srcartermd

#19
Diseazd

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You guys have some great stuff! The Z Car Garage site is awesome. That's just what Doc said "Flat top pistons, shaved heads with his cam shims (to keep the chain tight) special valves, Isky reground cam, aluminum flywheel and SU's with SM needles and he thought it would turn high 13's. I also love the web that XRAY provided on the Stroker Motor. That's as good as it gets for instruction for anyone building any L series motor for the first time! Guy

70, 71, 2 72's, and a 73 240z....
90 300zx and a 1996 Acura NSX.....but who's counting?


#20
janaka

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My F54 (flattops) and P79 combo is putting down a firm 162rwhp at 6k rpm. its got a mild cam (.460 lift only) and SU's. its a fun drive, not fast by any means though. 15.1 car, that was with 50* weather and a moderate 60' time on street tires (not that i was spinning much anyway). definately no screaming rocket. I've contemplated the L6 build and meh V8 just seems to fit my needs/wants better. to each their own




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