Hey mick didn't your datto have a 2.4 litre N/A FJ20 Stroker before you
bought the car????
-----Original Message-----
From: Errol Smith <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, April 21, 2000 9:59 PM
Subject: Re: FJ mods
>Luke,
>The main problem with the NA (naturally aspirated) FJ20 is the lack of
>abilty to get a high CR (compression rato). The NA FJ20E cannot get a CR
>over 9.8 approx, due to the head design. Valve angles in the head are wrong
>and pistons get in the way of valves etc. So if you shave the head you must
>put reliefs in the pistons, that further lowers the CR. The best you can
>expect from a NA FJ 2.0 is approximarely 185 - 190 hp, and that is a good
>one. In NA form the engines are good for an easy 160 - 170 hp, but over
>this it will cost you a large amount to get those last few hp. In stock
>form the NA head flows sufficiently to acheive approximately 240hp so head
>mods will not improve the HP capacity much if at all. It may even cause you
>to lose some driveability at mid range speeds. Rather than looking for more
>power from the engine, maybe look at ways to lose less of the available
>energy to things like cooling fans, alternators, flywheels, body weight,
>overall gear ratios etc. You can still get really good performance from
>the NA engine at 170 hp as it is a high torque engine design.
>
>The FJ engine was originally designed as the FJ24 NA. In this form the
>swept volume of the cylinder is sufficient to achieve CR's of 11:1 and then
>you can get some real power (260hp is realistic). To the best of my
>limited knowledge the Z24 crank is not compatible with the FJ24 block.
>(cylinder spacing is different I am told?). To make an FJ 24, you need the
>FJ24 crank, rods and pistons.
>
>The FJ's weight is a real downer in NA form in terms of hp/lb or Kw/Kg
>engine mass. In spite of this I think the FJ is still Nissans best Turbo
>engine in terms of reliability for power output. SR's do have a habit of
>breaking exhaust rocker arms when used at reasonably high engine speeds.
>Check the comments on the SSS automotive site on their engine designs etc
>for more info on Datsun/Nissan engine designs and especially the FJ series.
>Cheers
>Feral Errol
>
>----------
>From: Leadex <[EMAIL PROTECTED]>
>To: ozdat <[EMAIL PROTECTED]>
>Subject: FJ mods
>Date: Friday, April 21, 2000 6:54
>
>I am desperate for some cheap ways to get some power from my FJ running on
>webbers. The engine is in good nick as it is, so will a bit of simple head
>work and bigger valves get much more power? Also, will Z24 parts fit to
>build a 2.4L engine?
>What is a cheap four cylinder place that can supply the parts and do some
>of the work?
>
>Thanks
>Luke
>
>
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