Siemens/Deka 72 and 83# Injectors

[MopàrBCN]

I'm sorry to dispute your claims but you are wayyyyyy off. For 300+ hp a +40 is more that enough. A true 72 lb injector rated @ 43 psi will support closer to 450+ hp. Douching your cylinders is a bad idea even if this would start or stay running long enough to wash the cylinders.

Go see www.rceng.com and use thier calculator to see my point.

FYI,
Marion

Hi, I accept your point of view although I don't share it entirely:

The way I calculate you would support with +40% injector at 80% dutycycle 309hp. My recomendation was aimed at projects going beyond 300hp and referred to "savely" going this way!

So yes, also my calculation supports your claim for 300 hp with +40% but at the same time it supports the point I made, because in my view your are close to the limit at 300hp.

If you run 72 injectors your can achieve sufficient fueling at 300 hp with much less dutycylce. This is my point.

At the same time I wouldn't put 72 injectors on if I'd plan to run less then 300 hp. But I stated "savely" and "above 300hp". Anyone who want's to go beyond 300hp with +40 shall feel free to do it. I wouldnt.

Thats all :-)

["Top Fuel" Bender]

I made 320hp 370ft/lbs with the 40+'s with a stock fuelpressure regulator
and a bad O2 giving below 10:1 air/fuel across the board

but I have since switched 72's