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

[carr914]

Michel, I'm in awe of the progress you have made with this car. I'm glad for you that you acted quicker than me when you bought it. Your engine specs are very close to what I have in my conversion. I think your goals of 8,000 are optimistic. I know my engine will do it, but the dyno proved that peak hp was in the 6,800 to 7,300 range depending on jetting, fuel octane changes, and exhaust system. While it might sound great (it does, I think I have the sweetest sounding car), I think trying to achieve higher rpms on a consistant basis will not gain anything performance-wise. It will still perform and sound awesome at lower top rpm than what you are shooting for. In the end, go for what you want, as you will be the ultimate judge of your project. I always look forward to your progress.

T.C.