Upgrading a 2.4E worth the effort?

[tomlin]

Hi all,

I sometimes have thoughts about raising the compresson in my 2.4E to get some more power than the stock 165 hp at 6300 rpm and a little better sound aswell. I´ve read about using 2.2S pistons to get a 9.66 compression, but is it enough to do the trick and is it cost effective? Or is it better to to a full upgrade to 2.4S spec with cams? Do I need to add a oil cooler with a raised compression? And are there any good sport mufflers with stock appearence on the market that also adds some hp´s?

My engine was opened and freshened by the previous owner about 15 years and 80.000 km´s ago when two cylinders were replaced and all tolerances where checked. It runs very well today and pulls strong through the gears, and it´s almost 100% dry aswell

[karlusmagnus]

I drove Tom Morgan's old car, and i believe she had a 2.4E with the 2.2S pistons. I have a 2.4E (w/carbs) and I thought that his car had more oomph and was a very nice upgrade indeed. Tom's handle is "Racemor" and if you search his posts you'll probably find more info, or PM him. I think he sold the car to the UK, so you might check with Andyjboy about where it is now, and how it drives.

[letsrollbabe]

Tomlin:

I am attaching a link to a Pelican search for upgrading a 2.4T which will shed some light on your questions. There are many comments about what can be achieved with simply changing to higher CR pistons.

http://forums.pelicanparts.com/searc...archid=5690041

I have a 72 2.4T MFI in Hellgelb (Light Yellow for us in the US) and I am planning to do a top end overhaul to gain more HP (53k on engine). Options I am considering are 2.2E pistons, 2.2S pistons, or bore cylinders to 85 mm and go with JE pistons (9.5-9.6). I am also planning either Solex or aftermarket cams, port the heads and open the stacks and TBs to S specs...aiming at approx. 200 hp with street friendly torque.

Whether it makes economic sense is always a personal question that only you can answer. An external oil cooler for extended spirited driving is always money well spent.

Gib

[Kjell]

"It runs very well today and pulls strong through the gears, and it´s almost 100% dry aswell "

Why touch it? Are you racing or something? A stock 2.4E is a wonderful
engine!

[tomlin]

Thanks for the input, guys. What I´ve been able to pick up so far on the Pelican forum is that several people seem to think a "high compression" 2.4E is a nice engine and good compromise for the street.

Kjell, my stock 2.4E is working just fine but after a while the need for some more hp starts to grow on you... I use my car just for fun on weekends and have no plans to go racing with it or do track days.

[tomlin]

A little update. I have bought a set of very, very low-mile Mahle 2.2E pistons and cylinders from TRE Motorsports that will be used when the time comes to refresh my engine. Don´t know when that will be, could be a year from now or 10 years. At this point I´m just putting miles on the car and I´m really enjoying it, this is the third summer I own it. It´s a keeper.

[tomlin]

A pic of my car during a Sports car meeting and tour in the north of Sweden this spring.

[MarkS]

After driving an otherwise stock 2.4 E before and after install of 2.2 S pistons I can say there was a very nice increase in response so much so I picked up a set of P's & C's for a 2.4E I have. Good chance they will never get installed but if I do find a home for the 2.4 the 2.2's are going in.

[RSTarga]

If you are going to open the engine and change pistons, you might as well get 2.7 RS Nikasils and get a true 30hp jump and quite a bit more torque.

[silver911]

+1 on the above.
When my current 2.4E needed a full rebuild (new P+Cs) it was a real easy choice.. upgrade to 2.7 P+Cs , recalibrate the MFI pump, polish and port the heads.. a bit of machine work and I now have a engine to die for 222bhp and a high, flat torque curve RS owners appreciate....
Not as much top end but on the road here its a beauty..

My previous 2.4E had the 2.2 pistons and had c 175bhp....