WOLFGANG posted:You are mixing VW with 356 engine specs. Although both are air cooled boxer engines - there are many differences past the first few years of production. The 356 1582cc S90 engine did indeed produce 90 horsepower - it had a 82.5 mm bore and 74 mm stoke with 9.1 CR. Stock 1600 7.5:1 engine was like 50 hp with the 1600S (higher compression 8.5:1) at 60 hp. A VW 1641 cc engine uses 87 mm pistons and a 69 mm stroke. That extra stroke and higher compression gave it the extra horsepower.
My bet is a 1641 cc VW engine might generate 65 hp - you'd need a stroker crank or larger pistons (or both to get more). The economy big engine in US is a 1914 cc - with stock 69 mm crank and 94 mm pistons - producing 80 hp or so. Speedster builders generally don't put the gold Porsche scripts on replicas - to do so would draw the ire of Porsche lawyers. Most are placed after car is sold by the new owner.
Rebuild your VW engine - new crank, new cam, new P&C and heads (valves). Larger than 88 mm pistons (1679 cc with 69 mm crank)) will require case and head machining. A 356 engine is costly and very costly to rebuild. An equal hp VW engine is a fraction of real Porsche parts cost.
Thanks
I appreciate your recommendations.
Australia does not have any mechanics who know about air cooled engines. They are all into the EFI bullshit.
You have given me something to think about. Now I need to find someone who understands all this.
Cheers