TBI High Pressure Injectors

[Nasty-Z]

I didn't the marine engines ran such high HP numbers!

Where these 17104288 injectors any special design from the original 13 psi injectors or were they simply regular TBI injectors with the pressure amped up to 30 PSI? Would this allow for safe operation of any GM TBI injector to be operated at these higher pressures?

Steve

They were essentially a 4.3 injector ran at a higher pressure, if you do the math , the 45 pph 4.3 injector @ 13 psi would be around 70 pph @ 32 psi , GM's thought was it would fight vapor lock by using a higher fuel pressure , aside from designing a new injector , what they already had was used and the pressure increased to fuel a BBC . Anyone who has dabbled with a TBI BBC though finds out quick enough that the injectors at that pressure were marginal for fueling at the factory settings , one of the first things I did to the stock 454 in my '94 Dually when I bought it was to revert to the earlier injectors (5235231) and ran them around 15 psi , woke the otherwise stock engine up .

If you are going to be raising pressures , especially on the BBC injectors , I would stay with the 5235231 platform , these are much more tolerant of higher pressures than the 17104288 injectors .

I as well as many others have run the 5235231 injectors upwards of 70+ PSI with no adverse effects on cone shape nor spray pattern.

TOM