Teague On Tech: Q & A with Bob Teague May/June 2020

As seen in Speedboat Magazine’s May/June 2020 Issue.

525SC Overheating at Idle

Dear Bob:
I have a ’97 Fountain 42 with three 525SCs. It has been parked and not run for two years. When I started one of the engines on a hose, after about ten minutes the temp gauge went up to 140 then dropped back down to below 100 and the overheat alarm started going off. I have replaced both the thermostat and sea water pump. Water pressure is normal (compared to the other two engines) while running. I also installed a gauge where the alarm sender is located in the intake manifold and verified the temp is around 190 there and the water is in fact cold around the thermostat. I am not sure where to look now.
Danny Barnett
Santa Fe, TX

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Teague On Tech: Q & A with Bob Teague April 2020

As seen in Speedboat Magazine’s April 2020 Issue.

Dear Bob:
I’m plumbing a twin-engine power steering with pressure from both pumps. I have a return line question. If I run a single line thru the straight part of a tee to a second cooler then branch from tee to first cooler, will it show preference or overload second reservoir? Or should I turn the tee and branch and run 2 sort of equal length lines to coolers to better balance the flow? Or, should I run sealed reservoir caps with hose reservoir cap to reservoir cap to balance? I am wondering if a closed system will present problems. My experience is with Sea Star style hydraulic steering which is fairly basic. My new boat requires new knowledge.

Thanks for any info you may have.

Todd Buchanan Lake Isabella, MI

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Teague On Tech: Q & A with Bob Teague March 2020

As seen in Speedboat Magazine’s March 2020 Issue.

Force Feed or
Pump to the

Dear Bob:
I have noticed that you run 2- or 3-stage raw water pumps on your supercharged EFI engines. What compensations do you make in the program that addresses the fuel puddling in the manifold under the intercooler? Are you just adding more fuel at idle or is there some
other tricks?

I am currently force feeding my intercoolers but intend to rebuild the engines
and outfi t them with 2-stage water pumps, and a sea strainer for both the intercoolers and engines and remove the intercooler pickups.

The engines are custom built 509 cubic inch big block Chevys with WhippleChargers and MOAIC intercoolers.


Kim Bomanson Finland Aland, AL

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Teague On Tech: Q & A with Bob Teague January 2020

Speedbaot Magazine Cover Art

As seen in Speedboat Magazine’s January 2020 Issue.

Max-5 for
Nordic Heat

Dear Bob:

I have a 2004 28′ Nordic Heat with a stock 496HO and Bravo X drive. The only modifi- cation is a 1″ drive spacer. Right now, the propeller is a Mercury Racing factory lab fi- nished Bravo One 24″ pitch 4-blade. With this prop, the engine runs a little over 5,000 rpm. The GPS indicates 60 mph, but that seems low. I am not sure I trust that. I just purchased the boat, so I do not have a lot of experience with it. I saw your Swoop Motorsports/Teague Talk video segment on the Mercury Racing Max-5 propellers for this boat. I was impressed. What pitch do you think I should purchase?  I typically run the boat at sea level up to 1,500-foot elevation.

Thanks so much for your help.

Wayne Hofer, Eagle Point, OR

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