Supercharge or Turbocharge
 

After this summer and the sale of my APU Supra I want to build a BBC for my 22' Scarab. I have extensive expertise in turbocharged, fuel injected applications and as a project I would like to go in this direction. However most of you guys I noticed like the blowers. Please weigh in and tell me why.

Less heat under the hatch.... boost remains constant with engine rpm. No turbo lag.... No frying the salt water inside the turbo heat shield....No "Hyper corrosion" from the super heated salt water. I guess in certain aplications... diesel... fresh water cooled... not a problem... I had them on my boat when I first got it.... had to take a cutting torch to all the exhaust studs to get it apart....

More torque at lower RPM's with superchargers... also less lag.

I have run both and have to say I have had alot more trouble with the turbo engines than I did with the blower engines. Turbos were fast I will grant you that BUT also more downtime.

But.... those are all pluses.

Supercharger makes power from 1 RPM and up. More low end coming on plane power to blow a drive.

Plus, where are you RPM wise most of the time in the boat? 3500 or so RPM right? Right where turbos are making Boost. You dont need a TON of power from a stop...

Use turbochargers if you can. Not much info is readily available, although power is awesome and lag can be tuned out with proper sizing and efi. Thats what Ive found. Greg

Actually big inch with turbos would work better!

Why give away 10% crank HP to a blower pully?

TURBO!

Reed, it sounds like you were running lean if you had that much heat to mess up exhaust studs.

blower or turbo doesnt matter as long as they boost but Big inch is a must
:)

Oh I'm not worried about lag. I can get one to react as quick as a supercharger with no problem. I'm concerned mainly about exhaust problems that any of you may have had. reversion, supercooling, and bearing life due to thermal shock. I know for a fact that you shouldn't cool one too quickly. have any of you used a water cooled unit or is it best to stay with oil cooled units for marine use.

Roby

Roby