2.4T Engine Upgrade/Build
 

Hello all!

I have a 1972 911 T.V ( ROW) 2.4l engine that i would like to finish rebuilding and upgrade. I have searched around the web on possible things to do to the engine to boost performance but i am still confused as to what would be the best route for mostly street driving with the occasional track day (to keep car alive).

options:

Keeping stock 7R case and rods and swapping P/C's for 2.2 T P/C's. Can i keep my T cams with this setup? or can i bore out my existing P/C's a little further?

Keep stock 7R case, rods, P/C's, and swap out cams for E Cams

or is it possible to increase everything to a 2.7 spec by using Solex Cams, 9.5 JE'S, and 40mm webers for fuel delivery?

These were some of the most popular choice i have researched on. Has anyone done any of these to their 2.4's? Once the engine is rebuilt i plan on keeping it in 911 for a while (until i find a reasonable 3.2 engine) then putting it in my 914. All help is greatly appreciated!

2.4 choices
 

most expensive and most hp and torque is to send case for boring for 90 mm p/c adding solex cam. re set your mfi (you have mfi right?) mfi is better than carbs in many ways one of which should be better gas mileage. I get 12 to 19 mpg with above set up (40 mm carbs). Its a pain to get gas every 150 miles. I am also assuming you have 32 mm intake heads so you should look for 75-77 2.7 heads with35 mm intake or bore out your heads. cheaper but also pretty good would be option number one with higher cr pistons on nickie cylinders and e cams. you could get je pistons with 9.5. best henry

This is the route I'm going. 72 "T" has dismal compression: 8.0-1 (specs here). I'm opting for the 86mm (up from OEM 84mm) AA cylinders with JE piston (pretty close to the 2.2E spec, I think) resulting in a 2.5L with ~9.5-1 CR (good for single plug/pump gas). The case will accept slightly larger P/C's without modification. E cams will work well with the T/E 32mm ports. You should end up with a very street able car with a good bump in all around performance for the $$ involved. Of course, your fuel system will require tuning for the cam/CR changes.

And, I'm opting to have nikasil plated on the brial AA cylinders, something you should look into as a precaution while using the non-OEM AA stuff.

Great
 

Thanks guys! I might have 86mm Pistons laying around (Grandpa's Garage was stocked)