Dreaded Prior Owner
Join Date: Oct 2011
Location: Far from another Esprit.....
SailorBob has me thinking about better fuel injector geometry.
Newer 4 valve engines use a twin-spray design to aim the fuel streams more at the backs of the intake valves rather than down the middle of the port, which should help with vaporization and acceleration enrichment control by keeping the fuel off the port walls. My present injectors spray a 30 degree cone which hits the port wall almost before it enters the head.
These are sprays though, and described by largest percentages of fuel hitting a particular area, so aim is relative.
For my install I need 500-600cc injectors with a 15 degree spread and no bend from the injector axis. It's hard to find injectors with sufficient flow and proper geometry, but the closest I've found are some Bosch 0280 156 290 571cc EV6's, which have a 20 degree spread of the two 7 degree wide streams. These were used in some Polaris snowmobiles where the injector bung was right in the cylinder head intake port.
These are shorter than my present injectors, and a different impedence, so there will be some re-work before I can test these.
1985 BRG Turbo Esprit
Chargecooled w/Megasquirt EFI