Technical > Matt Shaff's Engine Shop
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JrFuel Hayden:
I agree with George, we run water in our iron SBC JrFueler. For one reason we use freeze plug heaters to pre-heat the block, another is water keeps the block/ head temp more even, and we saw more dyno HP because the water keeps the cylinder walls from harmonics, and round for better ring seal. Also block filler might weigh more than water. One time we ran it dry, and it got hot enough to torch the block between the center cylinders and the matching spot on the heads. I had to weld the iron block and heads.
BTW, I know of some very fast JF cars that run BowTie blocks, mostly light race cars with small ci motors, ie. under 400 ci. Don Enriquez just won the 2014 NHRA Hot Rod Reunion running 7.17, 185 mph with McKray Performance non RR 23° all iron SBC.
Jon
gasserx:
When you run it with water, do you mean without a pump? If so, how much and how about water pressure when its getting real hot?
Im not going to run with a radiator etc..
JrFuel Hayden:
Yes, no water pump, don't need it with alky, matter-a-fact your motor will make more power with higher engine temps, 180-200°, with water in the block & heads. Another reason to run water is you can get the motor hotter = more HP.
All the iron JrFuelers warm-up just before towing to the staging lanes, and allot of teams put a blanket over the motor to tow to the staging lanes. Keep-in-mind you will need to lean your barrel valve to build heat. Some teams have the driver pull the fuel shut-off abit to lean it down while backing up from burn-out. This takes some practice in the pits or you can kill the motor.
As far as controlling the water pressure, we just use a fuel injection high-speed lean-out valve and adjust it to 8-15 # to bleed the expansion into a puke tank. We have found it's best to plumb the water hoses from each side into a "T" then into the pressure valve, to keep the pressure equal on each side. Some teams fab a radiator cap and manifold, we like our way because it's cleaner looking, and we can fine adjust it with a shim or two. KISS.
Included picture shows the high-speed valve and puke tank, the fitting on the right is for our vacuum pump/ crank case puke hose.
Feel free to call with any questions, 805-444-4489
Jon
gasserx:
Thanks Jon (great name by the way, as i have it myself Jon M...) ;D
This gave me some ideas to think about. Very good information.
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