Hi guy's does anyone know of or heard of an FJ23 engine??
Supposed to have been a race car engine??

You sure its not the FJ24 your talking about?

Hi
No i'm not thinking of FJ24 as this is what we are using at the moment.
We are trying to find some history of the origin of this engine.As we have had great difficulty locating parts,ie- blocks. So we can keep our old car going.A friend who worked for nissan many years ago has got an idea that it origanlly was FJ23 in a race car.So this is why i asked.

So you are saying you already have a FJ24?

The FJ24 is the race car engine. The FJ20 is based on it.
Read the history on this web site. http://www.turbocreations.com/fj20/history.html

dont u mean fj24?

Hi, i know this a long message but please read and let me know what you think.
Yes we are using an FJ24 engine.I have also read the history of the engine.
But in my opinion and based on what was said to me the FJ24 is not wholly based on the FJ20.I also know that an FJ20 block is not always good enough to take a bore of 93mm, which is what the FJ24 along with stroked crank,was.
We have had problems with this engine and got a FJ20 block machined but this turned out to be porous.My mate ran a Nissan 240 rs in the british mintex national rally championship in 1988, which he won, the car was an evolution spec with a bore of 94mm. They had no problems and never heard of anyone else having any either.
Which takes us to the FJ23 engine, thicker walls in blocks to take 94mm???
How many of you out there have taken their FJ20 blocks over 93mm and had no problems.
Cheers Kenny

What you say is true. The FJ24 is not based on the FJ20. It is the other way around. The FJ20 is based on the FJ24.
I have never heard of a factory FJ23. The only time I have ever heard of an FJ23 been talked about other than this thread is when people use a FJ24 crank and try to make a FJ20 into a FJ24, but like you said they can’t bore the block big enough so it ends up being a 2.3L.

Try Stewart Wilkins Motorsport http://www.swmotorsport.com.au/contact.htm for more details.

What is wrong with your FJ24 block? If it’s the bores you may have to bite the bullet and sleeve your FJ24 block.

Cheers.

Hi
We had a crack in no 1 cylinder. It ran the length of the bore.
So we got hold of an FJ20 and had it bored.Hence the problem with it being porous, but we are now having liners put into the FJ20 block. Will be getting it back on the 12th. Hope everything will be ok, the machine shop are 100% certain it is fine. The FJ24 block has been machined out to see how much metal was left and they went to far.But when we get the other engine up and running we are going to send it of to see if it can be saved??
But has anyone built a true 2.4 n/a motor, for rally or race use using an FJ20 block, without resorting to trick parts!!!!
Cheers Kenny.

Stu Wilkins once said the turbo block is the one to use .

I believe Michael South Racing MSR has a 2.3L FJ20 N/A in his rally car as per this page - http://www.users.bigpond.net.au/msgofast/rally.html

Actually fantasy the FJ20's head was based on a productionised L/Z twin cam . The cam drive is different as is the bottom end designed around large bores (allows lots of valve area) and a short stroke with reasonably long rods to reduce piston speed and innertia . The FJ24 was a sporting evolution of the FJ20 (Grp A remember)with larger bores and stroke . The rods are a beefed up special with std crank pin dimensions and centres length . They look nearly identical to the L/Z 14 rods but longer and for wider crank pins . The later heads had larger inlet ports with a four bolt per runner flange pattern that they really didn't need . Cams were of course Nissan works FIA profiles .
Should you wish to see them I have access to the Nizmo catalogues for the Group a Spec 240RS engine a chassis and their manuals . Someone I know rallyed an FJ24 (built not bought) many years ago in Group G format .
Nissan works literature tells the real story complete with part numbers .
Cheers DP03 .