DIY 043 PLUMBING COOLANT FOR HILLBORN INJECTION

[KULTULZ]

I have received a request (via E-Mail) from a gentleman that wants assembly detail on coolant plumbing on a HILLBORN INJ setup (modified EFI) on a MEL. It seems (from photos of his setup) that his installation was on a competition only engine.

HILLBORN INJ SHOWN_1

HILLBORN INJ SHOWN_2

HILLBORN INJ SHOWN_3

HILLBORN INJ SHOWN_4

The MEL has a very unique cooling system, unlike most other gasoline engines. Coolant flow is different and cannot be modified other than for full competition. It must be kept as designed for street duty.

Coolant is pumped into the block by the water pump. Each leg (2) of the water pump has two channels each, one leading to a diverter valve and the other channel directing coolant towards the cylinder barrel jackets (this flow used to be regulated by a block thermostat(s) but were deleted from service in the early sixties).

The redirected coolant flow from the diverter(s) is forced into the front of the cylinder head(s) and flows inside the head towards the rear where it is then directed within the intake manifold and then flows towards the front coolant crossover in the intake. There is no crossover flow as in other engine designs, but only directional. The front coolant passages on the cylinder heads are not meant for crossover flow, but system pressure relief if needed. If you notice on service replacement intake manifold gaskets, the large opening goes to the rear of the head and the small hole to the front.

DIVERTER-BLOCK THERMOSTAT DIA.

COOLANT DIVERTER

Diverter- NOS Swaged End.jpg (32.96 KiB) Viewed 6914 times

BLOCKED-OFF COOLANT PASSAGE

So how do you plumb a HILLBORN setup or even a 6 X 2 setup?

EDELBROCK LM6 COOLANT FLOW_1

EDELBROCK LM6 COOLANT FLOW_2

EDELBROCK LM6 COOLANT FLOW_3

EDELBROCK LM6 COOLANT FLOW_4

EDELBROCK LM6 COOLANT FLOW_5

These photos show a setup that is somewhat correct but not completely thought out. It does not allow (or I cannot see) the WP by-pass relief or provision(s) for a car heater.

The coolant lines that run under the intake are correct, but the routing could be made simpler by having the front pressure relief hoses connect at a fitting within the coolant lines. These lines would continue to the expansion tank (custom made shown in photo).

This would ensure proper cooling with no chance of overheating due to restricted coolant flow as it is copied from the OEM design.

[Beep]

2 things.

1) damn that engine stand looks small to be holding that 430...........

2) i wish the owner of that injection system had a feather up his booty and i had those injectors...

[Treinarts]

Not interested in feathers. Anything else to trade for Hilborn? TJR