2.5 shor stroke engine, my plans Options

[michel richard]

So here's what I'm doing for the engine as part of my "GT style" conversion. First and foremost, I figure that an engine in a GT style car has to be rev-happy.

So, here's what I'm putting together, with the help of my trusty wrench, Ron Green of Campbell Gararge in Montreal:

Short stoke 2.5 Porsche engine:

1) Used 7R engine case, align bored, Timeserted, shuffle pinned
2) 90 mm JE pistons, 10.5 compression ratio
3) 90 mm replated Nickasil cylinders, sourced from EBS
4) Standard piston ring set
5) 66 mm counterweighted crankshaft
6) GE 80 camshafts
7) EBS racing valve springs
8) EBS valve spring retainer set for above
9) 2.0 connecting rods
10) ARP rod bolts and nuts for above
11) twin plugged heads
12) Electromotive HPV twin ignition
13) Turbo lower valve covers
14) front mounted ol cooler with "GT Style" installation
15) new bearings and gaskets all around
16) miscelaneous engine parts, stock.

I still need to figure out what to do with the port sizes in the head. The target is to have a 8,000 rpm redline, and 250 hp, although the redline is more important than the hp to me.

So that's the plan. I pulled the trigger on the hard parts above today. ( I already have the crank and the miscelaneous parts).

Induction is going to be 40 mm PMO carbs, jetting to be determined.

I'll post to this thread as progress is mad on the engine.

Michel Richard

[TimT]

Actually the Haltech E11v2 can be set up for full sequential injection, and direct fire ignition. We installed this system on a turbocharged Supercup engine we built. The Bosch Motronic brain was removed and the E11 installed. The installation is really sweet. The original harness for the engine was used, and with the exception of the different color ECU the install looks like it cam from the factory.

The E6X is the unit we sell most of, and yes it is batch fire. On the /6 engine we wire pairs of cylinders together so its really semi-sequential, or semi-batch. ie a pair of injectors is firing when a pair of pistons approach TDC.

Batch fire is fine. making the wiring harnesses is easier, etc..

The 935 clone we built is running E6X batch fired/wasted spark/staged injection, that engine has some get up and go (IMG:http://www.914world.com/bbs2/html/emoticons/w00t.gif)