Having just completed a short stroke 3.2 I am moving on (or maybe backwards) and am interested in experience/opinions on building a high revving, 10-12000 rpm small, 2.0-2.4 litre engine. Although it may sound silly to some I enjoy that early high rpm sound and it will be going into (with some serious changes)an early 356 "Outlaw". Any thoughts would be appreciated.

Thanks,
Erick

 

I admit that I am not an engine guru, by any stretch. However, my professional background is in structures and dynamics. The best thing you can try through out the engine, is to keep all reciprocating weight down to as low as possible. Light weight pistons are the first and most important area of this "diet". Try the ones from Shasta. Then move on to the con-rods, crank, flywheel, etc.. . Do not forget the valve train either.

I hope this is helpful. <img src="graemlins/a_smil17.gif" border="0" alt="[blabla]" />

 

Erick,

Go to the racing forum and check the replies to my post on "Ultimate 2 Liter". I have driven and owned some exotic 2 liter but never 10-12K RPM. My highest redline has been 8500.

I'm currently building another one and have gotten some real good feedback on Rennlist.

Contact me if I can be of help.

 

8 Canary is right on the mark with this one, I may be new to porsches but I'm very familiar with high revving "all motor" drag race engines. Reduce reciprocating weight to the bare minimum while still retaining strength, definately won't be inexpensive. For example the custom light weight pistons in my 650hp smallblock ford cost me close to $2000.00, I had a competent parts builder perfectly match them to my heads then remove ALL unneccessary weight and match them to within 1/2gram. That motor with a 4" stroke will spin 9000 rpms all season long. Second thing I would look into would be starting with the strongest block you can get and then strengthening it anyway you can, I've heard of shuffle pins and think they're a must. Remember spinning a motor that high means it literally wants to pull itself apart, reducing moving weight and strengthening the block will help prevent this. Still don't plan on it being a daily driver, a motor like this will need ton's of airflow and a lot of maintenance. That airflow will kill any "bottom end" the motor previously had. Good luck, and enjoy those RPM's

 

[quote]Originally posted by Erick:
<strong>Having just completed a short stroke 3.2 I am moving on (or maybe backwards) and am interested in experience/opinions on building a high revving, 10-12000 rpm small, 2.0-2.4 litre engine. Although it may sound silly to some I enjoy that early high rpm sound and it will be going into (with some serious changes)an early 356 "Outlaw". Any thoughts would be appreciated.

Thanks,
Erick</strong><hr></blockquote>


Hi Erick:

You'll likely get lots of opinions on this subject but as I've built a few motors like this during past, I'd offer some advice.

That kind of RPM isn't necessary for excellent performance and drivability. 911 oiling systems run into some major issues at those revs due to the center of the crank is the last place to get oil and it experiences oil starvation unless major case and crankshaft modifications are done and the proper oil pump is used.

The valve train is the next problem area and you will need some expensive parts to achieve durability and reliability at tht level.

In order to ensure that the "cart is behind the horse", I would respectfully suggest that you first figure out what power and torque you need to achieve your performance goals, set a realistic budget, and then determine the engine's configuration that will meet the "Mission Requirements".

This methodology ensures that you get the most bang-for-the-buck and you do not waste money on things that are useless.

Happy to help, I am;