SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Mark on July 16, 2008, 08:36:15 AM
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Hello all,
Just picked up an older PFM twin turbo kit for the 20 Spectra.
My question concerns the water supply to the twin water/air intercoolers. For those of you with a similar installation - do you bring raw water from the pump directly or do you maintain a dedicated and clean fresh water loop on board using a water/water heat exchanger? Should I be paranoid about sand and river muck accumulating in the intercoolers?
Cheers, Mark
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They make a sea strainer or sand strainer to catch all the sand and muck.
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LUCKY bastard ;D ive been looking for a kit, yes a sea strainer is a must on the inlet side, and of course you wanna have the coolest water charge you can get for the intercoolers.send us some pics of the kit!!
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Thanks for the quick responses!
The raw water strainers in my sportfisher take out anything larger than an 1/8" or so, just a stainless steel perf metal basket sitting in a Lexan/brass vessel. Are you recommending something with a paper or metal mesh filter or ? What water flow rates are required by the intercoolers, 4 GPM or so? Should I now add some type of water pressure regulator to my entire cooling system, or just the intercooler inlets?
Probably going to do this project as a draw thru throttle body with digital port injection on a Victor manifold. Used to have a 6-71 on this motor so the block is ready to go. "O" ringed 4 bolt 468 BBC, copper head gaskets, steel crank, 7.5:1 forged TRW blower pistons, all turning an AA impeller.
I'll post pics when the kit arrives tomorrow.
Cheers, Mark
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http://www.cpperformance.com/products/Cooling_System/sea-strainers.htm
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I would run the sand strainer from Hardin marine.
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http://www.hardin-marine.com/images/625-4620.jpg
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http://www.hardin-marine.com/images/625-4622-sm.jpg
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Thanks, these look perfect but ouch ($$$). I'll take a look in McMaster's and Grainger's for an "industrial" model rather than one with the "marine" label attached. I'm assuming that these service only the water demands of the intercooler.
Cheers, Mark
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Yup they are pricy but what cost more??
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The intercooler elements are $300 a set new. I assume you remove them and backflush with diluted pool acid on a periodic basis, but I'll bet you can plug them up instantly by getting in too shallow of water. McMaster-Carr offers 100% stainless steel cartrige water filters for around $150 with a 10GPM/250PSI rating and filtering down to 2 micron diameters. These may filter too good and clog prematurely.
My other thought is to use a tube-in-shell heat exchanger (which we use in our product line - $0.00 ;D) and allow the intercoolers their own dedicated loop (perhaps making a pass or two through the ice chest in the process) I would only need supply a small circulation pump.
My wife accuses my of overanalyzing issues to the point of paralysis. I have no clue where she gets that idea from ::)
Cheers, Mark
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What are you doing with the 671?? :o
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Don't know yet. The two younger boys are eyeing for their 19 footer but the compression ratio on their new motor is at 8.5 or 8.75:1. That's a bit tight for a non-intercooled Roots application.
If I don't cave in to them then I'll sell it, the EFI spacer/injectors, and the Enderle hat as a package deal fairly cheap. Pulleys are a 52/50 tooth set for a 3" belt. Idler brackets mount to the blower. Manifold is a Crager as I remember. I'll know within the week what the plan will be.
Cheers, Mark
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My kit arrived and everything looks good. We'll pull it apart and polish everything tomorrow.
Cheers, Mark