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PostPosted: Wed Dec 21, 2011 12:15 pm 
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dat2kman wrote:
When it eas purchased new, in 1983 the price paid eas $25,000 AUD
To put that into perspective for the "young fellers", I bought my first house around the same time (1985). I paid $38,000 for it.

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PostPosted: Wed Dec 21, 2011 2:57 pm 
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People love to forget about inflation haha!

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PostPosted: Wed Dec 21, 2011 3:16 pm 
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Location: Zombie-free unfluoridated town in QLD
with all the inflation a u20 powered fairlady is a bargain


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PostPosted: Thu Dec 22, 2011 3:37 pm 
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Location: Gold Coast
dat2kman wrote:
You young fellers sound like doubting Thomas's! Its a FJ24. These were a Nissan Competioin special engine, no they are NOT a bored out and stroked fj20, so forget your thinking about Nissan 2 litre internals.
The fj24 was a purpose built ( approx 500 units made) to go into the 240RS rally cars to compete in the World Ralky Championships, in the early to mid 1980's. Back then they wete developing approx 280 hp and 230 ft lb. They ate a full race engine, dry sumped, external pil pumps, block bracing and thicknesses like nothing else Nissan made, the cylinder heads wer unique, not like fj20 at all, intake and exhaust manifolds were unique to the 2.4. Good gains wete made by changing cam profiles, and going from a 50 mm carbs to 55 mm carbs.
Thete were only 200 240RScars made, and only 30 were the full house competition version for rally use, plenty were converted and up-specced. My engine is one of rhe 30 special built ones. When it eas purchased new, in 1983 the price paid eas $25,000 AUD, or 9000 british pounds from Blydenstein' UK workshops.
There you go, a bit more history!
No disrespect intended, and I don't have a drama with the power output. Keep the gas flowing at 9000RPM and I have no doubt that power level is achievable. It was the specific torque value I was querying. As I said, it sounds awful high. Big cams / big carbs, massive bottom ends and flowed heads are generally built to flow more gas, hence increase power. Getting torque values that high is much harder to achieve, and specific torque values are less sensitive to engine configuration / spec. As I said, even F1 engines are struggling to get over 100ft-lbs per litre, so your claim of 250 ft lbs from a 2.4 seems a bit optimistic.

I remember the 240RS's in rallying in the early 80's, even though I was still more of a tarmac fan in those days. It wasn't till the late 80's I started getting interested in rallying. In fact, rallying is probably the reason I don't own a 2000 Sports today. I bought one in 1995 (U20) to restore, but since I was rallying, I realised that all of my time / cash went into the rally car, so the poor old 2000 sat under a tarp for 3 years till I finally sold it, having done nothing to it in that time. Yes, another of those "if only" stories. I sold it for a song, too.

Thanks for the young fella comment - I haven't been called that for a few years. :thumbsup:

Don't get me wrong I'm envious of your fantastic collection of cars there. I think I just realised what car your FJ24 is housed in, too. I'd very much like to come and have a look at it before you sell, even though I'm going to be a drooling tyre kicker with no intention (or $$$) to buy it. Would love the opportunity to see such a piece of Australia's motorsport history. Oh, I'm sure the 2000 Sports will be nice too :wink:

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PostPosted: Thu Dec 22, 2011 7:17 pm 
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If a good L20b as posted earlier is making 190lbs of torque then theres is no reason
why an fj24 cant make 250lbs easily and the u20 the same 190lbs or there abouts.
F1 and bike engines are a different kettle no comparison to road engines for torque.


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PostPosted: Thu Dec 22, 2011 9:32 pm 
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Location: The Gap Brisvegas
Peter, if/ when you're next in Bribane, im out at The Gap, get a hold of me prior and swing by for a sticky at the 120Y, and the otjer stuff!

Oh, i have a Mazda rx7 historic sports secan im restoring as well! 13 b pp! Tailsjaft is 400 mm long!

Yeah, the F1 engines do rely on high rpm horsepower, when they used to run the BMW m10 derivative in mid 80's with turbo, we wete hearing all sorts of crazy hp in qulifying mode figures, prwtty much based on rod stroke ratio, and their internals wete like delicate sewing machines at a gazillion rpm's!!
Les Collins at Datrally was able to get some very good torque figures on the dyno in Moorabbin, the fj24 along with Pud Thompsons fj24 lived on tjat dyno in early 80's , back then these two enginrs wete the shizz! And far more reliable than any BDA or BDG Escort donk!

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PostPosted: Thu Dec 22, 2011 10:45 pm 
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those bimmer engines needed to be seasoned m10 blocks with minimum 100,000klms before they considered them for F1 bloody crazy days and to think the FJs where heading for the same direction http://www.youtube.com/watch?v=eG-4sSoX ... re=related


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PostPosted: Tue Nov 20, 2012 2:21 pm 
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http://datsun1000.com/TopicView.asp?Top ... 1#Post6044

This might be an interesting read for some - in this thread the datsun 1000 (a beautiful machine of lightweight combined with nice hp a real terror) of this guy got done by an L20 1600 4 door with 220hp by 1000 second, the 1600 with L series is still king after all these years. Sounds like 8 valves well setup 4 cyl in a well setup car with a good driver can still make good torque flexibly throughout the required rpm. Anyone know much about the engine and induction of this winning 1600?


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PostPosted: Tue Nov 20, 2012 3:14 pm 
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Link didn't work D...

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PostPosted: Wed Nov 21, 2012 12:17 am 
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sorry & thank you SR20D

http://www.youtube.com/watch?v=dG58Eoo1JHw

from

http://datsun1000.com/TopicView.asp?TopicID=628


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PostPosted: Mon Apr 17, 2017 5:49 pm 
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d wrote:
Im interested to see why some U20 engines are making 234-250hp ate
while some of the best L series only make 200-220hp?
I know the u20 is rare and heavy but some fairlady peeps are claiming
250hp in full race versions. Do any L20B make those figures?

u20 where factory with 46mm inlet valves!!!!
Quote:
The Works Datsun Sports 2000 race car is the original David Mingay modified Prod Sports racer, I have owned it for a while, and regularly still compete in a lot of historic meetings.
Set a new Group O record at 2007 Australian hill climb champs, and a few first outrights and podium places at a lot of circuit meetings and a few fastes lap records in some races.
Incredible but true, It still runs original U20 motor, 234hp at 7500 and 181ft/;b at 5500
It is fitted with parts from Datsun competiton parts catalogues. want to know more, just askme
Check out Group S Racing websites for Morgan Park 2007 and 2008 race reports.

When I raced my 2000 against Bob Cox/ Mingay car I only had 200hp and I thought that was good.
Great to see the car is still alive and winning races.


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PostPosted: Thu Nov 15, 2018 12:56 pm 
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just found out the H25 was often used in Nissan Forklights and so far only
semi counterweighed crank so no good for high rpm, either way the U20
Fairlady prices are around 50% higher than 2012 but still cheap really as
they are a better built car than any 240 or 260 Z.


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