supercharged 525s
 

I am thinking of purchasing a 38 fountain w/mercruiser 525 scs they have 199 hrs on them I know nothing about supercharged motors.What maintenence do they require and when.I heard you should do a valve job at 200 hrs?

Re: supercharged 525s
 

These are 454 motors with a small charger on them. I think they are the 250 range such as a B&M. A valve job would be a must. Becuause you don't probably know the full history of those motors. Overheated, Gas choices, How often serviced, etc. The last thing you want to do is drop a valve seat. You need to do a compression check and cylinder leak down test. I would be willing to bet there is some leakage past some of your exhaust valves.

Re: supercharged 525s
 

thanks,anything else you'ld recommend

Re: supercharged 525s
 

I've got a single 525sc in my Pantera. I just freshened the top half of the engine at 330hrs and added a roller cam. Everything was in better shape than I would have thought. I needed to have a valve job done due to some water getting into one of the cylinders and it pitted the valve.

I change the oil every 25-30 hours and run synthetic. The only other maintance other than a normal engine is to change the blower lube every 50 hrs or so. I also check the level every 10 or so hours.

The engine is completely turn key and reliable.

Re: supercharged 525s
 

i've heard the 52sc reffered to as the "best merc blue engine produced" so it seem to be pretty well liked. Good power, good reliabilty. i believe the supercharged used on it was the wiend 177.

as for checking out same checks that you'd do on a non blower motor. YOu might wnat to measure the boost pulley and see what size it is so you can figure dout how much boost they were running.

Re: supercharged 525s
 

Also, due a search for 525SC and you will find a ton of info on them.

Re: supercharged 525s
 

Hey Griff, did the Roller cam make a difference? Did you see an increase in R's after the rebuild. Which cam and why did you select it. I will probably freshen my 525's over the winter. Any other suggestions other then intercoolers and smaller pulleys for little more HP?