Fiat sohc: (domed) piston options
Posted: March 12th, 2008, 10:59 am
Dear Guy,
dear all,
since this is my first post to the illustrious circle a word of introduction: I'm about to build a Fiat X19 racer according to the old Group-4 regulations for historic races. The whole project is quite a bit cumbersome, bodywork takes time and many useful things from struts to chassis-bearings are just not available easily....
My thoughts about the short engine are:
- X1/9 1500cc block with
- either 1500cc crank or 1600cc (tipo) crank
- H-shaped conrods from arrows or +-shaped ones from pauter
- Domed pistons for a cr of 12.5:1, max 13:1 that allow a 5.5mm lift at TDC
Questions:
- The compression height for 1500cc (stroke=63.9) and 1600cc (67.4) pistons should be different since those engines have equal block height/equal rod length. Would it be possible to use a 1500cc domed piston together with the 1600-tipo crank and compensate the 1.75mm with a thicker head gasket?
- Where can i get domed pistons for this application, do i need a custom production?
- Can the h-shaped arrows rod handle speeds up to 21.5m/sec?
Your comments are apriciated!
Armin
dear all,
since this is my first post to the illustrious circle a word of introduction: I'm about to build a Fiat X19 racer according to the old Group-4 regulations for historic races. The whole project is quite a bit cumbersome, bodywork takes time and many useful things from struts to chassis-bearings are just not available easily....
My thoughts about the short engine are:
- X1/9 1500cc block with
- either 1500cc crank or 1600cc (tipo) crank
- H-shaped conrods from arrows or +-shaped ones from pauter
- Domed pistons for a cr of 12.5:1, max 13:1 that allow a 5.5mm lift at TDC
Questions:
- The compression height for 1500cc (stroke=63.9) and 1600cc (67.4) pistons should be different since those engines have equal block height/equal rod length. Would it be possible to use a 1500cc domed piston together with the 1600-tipo crank and compensate the 1.75mm with a thicker head gasket?
- Where can i get domed pistons for this application, do i need a custom production?
- Can the h-shaped arrows rod handle speeds up to 21.5m/sec?
Your comments are apriciated!
Armin