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New holden 6 engine made 1.72hp per cube


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#1 LC-GTR-1969

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Posted 27 December 2019 - 07:54 AM

Gday all, been quiet on here for a while so I thought I would post up the results from my recent JZED headed engine build... 

 

Very happy with the results for what it is, runs on pump 98, standard stroke, .030 over and has only off the shelf HM9C headers, re-welded to the JZED flange. 

 

It made 352hp on engine dyno at 6700 and held it to 7000rpm. Made 285 ft/lb at 4500 and pretty much holds (and revisits this number) to within 15 ft/lb through to 7000rpm, very flat torque curve. 

 

Cam is relatively mild solid flat tappet, was worried about a roller lifter dropping its guts as its a pure street car that does extended idling in sydney, even though with a softer profile the roller may have been ok, it worried me. 

 

Engine idled like a dream on the dyno, very smooth. 

 

Even though this is an expensive combo to put together, it is not a 'no expenses spared' kind of setup. 

 

Here are some specs, for those who are interested- its a fairly typical bottom end, similar to what most good 9 port engines would run. 

 

-12:1 compression

- 48 DCO/SP webers

- forged pistons using 1.2mm compression rings from Total Seal

- H beam honda rods

- standard blue crank, no mods to counterweights, drilled snout and flywheel bolts 7/16. 

- Sonic girdle

- half grout fill

- cam is low 250s@50. 

- Timing was 29 degrees 

- uses ATI balancer and custom hub

- Davies Craig electric water pump

 

The engine made 260hp at 4850rpm, which is more than what my 9 port head made at 6500rpm.  Made 325hp at 6100rpm. I am very happy with this considering the cam and lack of dry sump/vacuum pump and just using 98 premium straight from the bowser. Most of the JZED headed deals that made high 300s like 370-380hp are running big solid roller cams- a fair bit more duration and lift than what I am running, custom 1 3/4 inch tuned length pipes and vacuum pumps etc... considering its a pure street car, rightly or wrongly, I didn't want to go that far.

 

If anyone wants to see the dyno video or dyno sheets, PM me with your number and I will send it through, cant seem to put these here using the system at the moment. 


Edited by LC-GTR-1969, 27 December 2019 - 07:55 AM.


#2 S pack

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Posted 27 December 2019 - 08:07 AM

Awesome. :) :spoton:


Edited by S pack, 27 December 2019 - 08:08 AM.


#3 LJ RB30

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Posted 27 December 2019 - 08:14 AM

Very nice 😁😁👍
Did you video the dyno run by any chance? 🤞

#4 LC-GTR-1969

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Posted 27 December 2019 - 08:44 AM

Very nice
Did you video the dyno run by any chance?

 

Yes but I don't know how to add it here.. 



#5 yel327

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Posted 27 December 2019 - 08:47 AM

Pretty impressive, especially going into a tiny car like LC-J. My 4.0L DOHC supercharged V6 made similar power under 5500rpm with a lot more torque, but giving away 700cc and normally aspirated is pretty damn good! It is basically LS1 type power with a fair bit less torque but in the little Torana no need for the torque. Well done.

#6 Com_VC

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Posted 27 December 2019 - 08:51 AM

That's some good power figures.  Any mods to the oiling system? Sump, pickup?  

 

Post up some photos :)



#7 LC-GTR-1969

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Posted 27 December 2019 - 09:04 AM

Here is one pic... 



That's some good power figures.  Any mods to the oiling system? Sump, pickup?  

 

Post up some photos :)

 

Yes, ASR sump with external oil feed, external oil feed for cam tunnel, some mods to galleries etc... 



Here is the dyno result

Attached Files



#8 LC-GTR-1969

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Posted 27 December 2019 - 09:10 AM

Pretty impressive, especially going into a tiny car like LC-J. My 4.0L DOHC supercharged V6 made similar power under 5500rpm with a lot more torque, but giving away 700cc and normally aspirated is pretty damn good! It is basically LS1 type power with a fair bit less torque but in the little Torana no need for the torque. Well done.

 

Thanks, yes, it is going into my LC. The engine made the same HP as an LS (260 odd KW), albeit the LS is running a lot more accessories and a lot more lowe end torque, but still, I am pretty happy with that... 


Edited by LC-GTR-1969, 27 December 2019 - 09:15 AM.


#9 yel327

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Posted 27 December 2019 - 09:19 AM

And no need for Engineering of an LS!

#10 Ice

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Posted 27 December 2019 - 09:48 AM

How good do Webbers look on a red 6 that engine would sound awesome at full song

#11 skap

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Posted 27 December 2019 - 10:12 AM

What sort of money is in the engine?

I’m betting if you throw as much at an LS it would blitz those figures...

#12 LC-GTR-1969

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Posted 27 December 2019 - 10:14 AM

What sort of money is in the engine?

I’m betting if you throw as much at an LS it would blitz those figures...

 

No offence mate, but of course a modern 6L with similar money spent would make more than a 50 year old design 3.3L. I am not sure you quite 'get' it... 


Edited by LC-GTR-1969, 27 December 2019 - 10:14 AM.


#13 Ice

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Posted 27 December 2019 - 10:38 AM

Joes a bit slow me thinks

#14 RallyRed

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Posted 27 December 2019 - 10:45 AM

nice work mate...

reminds me of this that popped up the other day...

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#15 LC-GTR-1969

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Posted 27 December 2019 - 10:55 AM

nice work mate...

reminds me of this that popped up the other day...

 

Thats a beautiful setup isnt it Red- billet block, stroker, weapon!



#16 RallyRed

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Posted 27 December 2019 - 11:17 AM

Thats a beautiful setup isnt it Red- billet block, stroker, weapon!

 

yeah, serious HP for sure 



#17 skap

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Posted 27 December 2019 - 04:47 PM

No offence mate, but of course a modern 6L with similar money spent would make more than a 50 year old design 3.3L. I am not sure you quite 'get' it...


Errr. You compared it to an LS earlier, hence my comment.

So.

What’s it cost to make 300 and something HP from a Holden 6?

#18 claysummers

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Posted 27 December 2019 - 05:02 PM

What sort of money is in the engine?

I’m betting if you throw as much at an LS it would blitz those figures...

Hey why not drop in a [insert name of massive all time high power donk here]. You wouldn’t have to spend any money on hotting it up and I’m betting it would shit on an LS. Might have to spend a bit on engineering but gee that isn’t really the point is it? Or is it?

Sorry, couldn’t help myself.


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#19 LXCHEV

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Posted 27 December 2019 - 11:01 PM

Awesome stuff! That donk looks horn and I can only imagine the noise it must make!

It’s funny - I started with a warm 202 many years ago, first with a Holley and then later with triples. Now playing with V8’s for decades, I truly miss that old engine. Comparing horse power levels for money spent against other engine options is irrelevant. There is something special about the old red sixes - especially when you get a bit more serious such as you’ve done here!

Well done on the build and the output you’ve achieved. I’d love to build something similar one day. Enjoy it!

#20 jd lj

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Posted 28 December 2019 - 05:38 AM

It's a great engine that any LC and LJ torana owner would love to have rumbling away under their bonnet. It sounds and looks great.

While it might be true that more power may be achieved with different engine combinations, a LC or LJ torana just has to have a hot Holden 6 with a set of triples hanging off it. Anything else just doesn't seem right in my opinion. There's also a sense of achievement you get by making good hp with an old red motor that I'm sure wouldn't be there in the same way with a bigger modern v8. It's just like Brock beating the Ford v8s in his little 6cyl LJ is more of an achievement than if they'd done it with a 308 engined LJ. This motor also avoids the requirements of getting engineered.

That's just my opinion and everyone is entitled to their own.

#21 claysummers

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Posted 28 December 2019 - 07:04 AM

Hear hear. 153624 repeat, repeat, repeat........

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#22 _2ELCS_

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Posted 28 December 2019 - 10:53 AM

Joes a bit slow me thinks

Joe is slow we know....



#23 Rockoz

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Posted 29 December 2019 - 09:55 AM

Hmmmm.

Now for 6 throttle body injection to bring it into the 21st century?

Would even have a similar look to the Webers.

 

Good on you for doing it.

My mind is slow with my painkillers and i was reading the first posts with the numbers bouncing around inside the head.

Took a while to click.

But that is really impressive power out of the little 6.

Sometimes you just have to do what you want, and you did.

 

Cheers

 

Rob



#24 digger

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Posted 15 January 2020 - 07:48 AM

Great build!

 I’m in the late stages of assembly some gizzards to go into a stroker inline 6 bmw about 199 CI up from 152 CI not too dissimilar in many ways and these are the kind of numbers i'm aiming for

What exhaust was this running in terms of primary and collector size and length etc?

 

who did the machine work?


Edited by digger, 15 January 2020 - 07:52 AM.


#25 jd lj

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Posted 15 January 2020 - 07:21 PM

The extractors are hm9c's with the flanges modified to suit the Jzed head.




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